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February 2002Volume 4, No. 2
A monthly publication for GM Dealership Service Professionals
Service Operations
Contents
Diagnostic Strategy . . . . . . . . . . . . . . . . . . . .1TechLink Website Rebuilt . . . . . . . . . . . . . . . . .1Class 2 Corner . . . . . . . . . . . . . . . . . . . . . . .2Tech Tips
Installing New Design Roof Rack Rails . . . . .2Programming IP Cluster after Replacement .4Noise in Tilt/Telescoping Steering Column . . .4Heated Seat Elements . . . . . . . . . . . . . . . .4U-Van IP Cluster Replacement Parts . . . . . .4I/P Squeak . . . . . . . . . . . . . . . . . . . . . . . .4Hazy Paint Appearance . . . . . . . . . . . . . . .5Driver’s Seatback Gap . . . . . . . . . . . . . . . .6Power Window Motor Replacement . . . . . . .6Prizm EVAP System Conditions . . . . . . . . . .6F/R Door Check Link Noise . . . . . . . . . . . . .7A/C Control Head Knob Replacement . . . . . .7
Oil Life System Reset Procedures – Trucks . . . .5TAC Tips
IP Cluster Intermittent Bulb Check . . . . . . . .6Turn Signal Flashes Fast . . . . . . . . . . . . . .6
Bulletins . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Techline News
the various pages. Click on themagnifying glass symbol to zoom in onthe page. And when you click on thehand symbol, you can “grab” onto thepage and drag it in the desired direction.
TIP: When you are viewing page 1 of
The situation happens every day. Youhave a customer’s car to repair, and thecondition requires diagnosis as a first step.If you could randomly scroll through SI2000, you’d find that there are hundreds ofthousands of pages of information. Clearly,you need a better strategy to find what youwant, quickly and efficiently.
Look no further. The Diagnostic Strategypresented here is a commonized processdesigned to help you navigate to thecorrect diagnostic procedure quickly. Theaccompanying figure illustrates theapproach. Branching out from theDiagnostic Starting Point, there are twodiagnostic paths (Path 1 and Path 2).
TIP: There’s a unique Diagnostic StartingPoint in SI 2000 for each sub-section ofeach vehicle. The information you will find
continued on page 3
Rebuilt TechLinkWebsite Launched
continued on page 2
Here’s some New Yearsnews that you’ll findinteresting and useful. TheGM TechLink website hasbeen redesigned and rebuilt. It can be found athttp://service.gm.com.
The on-screen versionnow looks just like theprinted version. To view thenew site, you must have theAdobe Acrobat Readerinstalled on your PC.
TIP: Click the Acrobatsymbol provided to installthe latest version of AdobeAcrobat Reader for your specificlanguage. This site is best viewed at ascreen resolution of 1024 x 768.
TIP: Use the Acrobat toolbar tonavigate the magazine. The forward andbackward arrows will move you through
DiagnosticStrategy
Diagnosticstarting point
Diagnosticsystem check
Intermittentand poor
connections
Systemoperations
Checking aftermarket
accessories
DTC List
DTCDiagnostic
Table
SymptomDiagnostic
Table
Symptoms
Symptom ListData LinkCommunications
DTCs?
Comm w/scan tool?
Path 1 Path 2
No
Yes
Yes
No
2
Techline News continued from page 1
the issue, if you click on a title in theTable of Contents, you will immediatelybe taken to the appropriate page.
From the left navigation bar, select:Monthly Articles to view all the past
issues of GM TechLink for 2000 and2001. When the menu pops up, click onthe desired month.
Techline takes you to an archive of allthe published Techline articles, which willinclude information about SI 2000, Tech2, service programming and more.
Toolbox will take you to an archive ofall the published J Tool related articles.
Nuts and Bolts takes you to anarchive of all of the published Nuts &Bolts articles, which cover theory ofoperation and basic service procedures.Past articles include electrical wiring and
measuring voltage.TAC Tips takes you to an archive of all
the published TAC Tips. This gives you aquick reference of all the latest technicalinformation provided by the GM TechnicalAssistance Center.
Bulletins takes you to an archive ofthe bulletins released to dealerships inthe past several years. The list includesthe bulletin number, subject and models,all organized by bulletin category.
TIP: Effective with the September2001 issue, you can view TechLink inGerman, Canadian French, and Spanish,as well as English. Simply click on thechosen language.
– Thanks to Jerry Turchanik, Tom Kurtz and Abra Quintero
GM TechLink is a monthly magazine forall GM retail technicians and serviceconsultants providing timely informationto help increase knowledge about GMproducts and improve the performanceof the service department. Thismagazine is a companion to the GMEdge publication.
Publisher & Editor:Mark Stesney
GM Service [email protected]
Technical Editor:Jim Horner
Production Manager:Marie Meredith
Desktop Publishing:Greg Szpaichler, MediaWurks
FAX number: 1-248-649-5465
Write to: TechLinkPO Box 500Troy, MI 48007-0500
GM TechLink on the Web: http://service.gm.com
General Motors service tips are intendedfor use by professional technicians, not a"do-it-yourselfer." They are written toinform those technicians of conditionsthat may occur on some vehicles, or toprovide information that could assist inthe proper service of a vehicle. Properlytrained technicians have the equipment,tools, safety instructions and know-howto do a job properly and safely. If acondition is described, do not assumethat the bulletin applies to your vehicleor that your vehicle will have thatcondition. See a General Motors dealerservicing your brand of General Motorsvehicle for information on whether yourvehicle may benefit from the information.Inclusion in this publication is notnecessarily an endorsement of theindividual or the company.
Copyright© 2001 General Motors Corporation
All rights reserved.
Every controller connected to theClass 2 bus is required to send out aState of Health (SOH) message every 2seconds. This message alerts the othercomputers to the presence of thecontroller sending the SOH message.This allows the computers to know if acontroller has malfunctioned, because itmay no longer be able to send its SOHmessage.
For example, if the BCM needsinformation from the PCM, and the PCM
can no longer send its SOH message,the BCM would know that there is aproblem with the PCM and set a U1016– Loss of Communications from thePCM. The BCM would also have to gointo default or fail safe mode ofoperation, i.e. no-start/no-crank. Manytimes the defaulted mode of operationwill be the focus of the customerconcern on the RO.
– Thanks to Mark Harris
Installing New DesignRoof Rack Cross Rails
TIP: This information is particularlyimportant for pre-delivery technicians.
For 2001 and 2002 ChevroletTrackers, new, more-aerodynamic roofrack cross rails went into production inFebruary, 2001. The cross rails are boxedseparately and shipped inside thevehicle. Although the cross rails appearidentical, they are actually two differentlengths. The longer cross bar is for thefront position and the shorter cross bar isfor the rear position. If installation of therear, shorter cross rail is attempted intothe front wider position, by trying tostretch it to fit, one of the attachmentarms will likely break off. There is a labelon the end of the front bar which
indicates its position, and the includeddirections also point this out.
– Thanks to Donald B. Sherman
3
Diagnostic Strategy continued from page 1
in the Diagnostic Starting Point for the sub-system you’re working on will lead you tothe proper path, and through the logicalsteps to isolate and repair the customerconcern.
Diagnostic Starting PointHere’s how to use the Diagnostic
Strategy. Begin by ‘building’ the vehicle inSI 2000. Then select the sub-system you’reinterested in. Next, select DiagnosticInformation and Procedures. The firstheading on the next menu is DiagnosticStarting Point.
Because each sub-system has uniquediagnostic requirements, the information inDiagnostic Starting Point is custom writtenfor each application.
In the Diagnostic Starting Point for sub-systems which can communicate with ascan tool, you will be instructed to conducta Diagnostic System Check. This is shownin the illustration as Path 1.
For systems which do not communicatewith a scan tool, the Diagnostic StartingPoint will instruct you to review thesystem Description and Operation. This willdo two things: it will help you determine ifthe condition described by the customer isnormal operation, and if not, it will help youdetermine which Symptom diagnosticprocedure to use. This is shown in theillustration as Path 2.
Path 1 – Diagnostic System CheckThe Diagnostic System Check does
more than instruct you to check for DTCs.The Diagnostic System Check is anessential part of diagnosing any system thatcan communicate with a scan tool.
If DTCs are present, you will be directedto specific DTC diagnostic procedures.Although not stated, the Diagnostic SystemCheck is used to prioritize DTCs in theorder they must be diagnosed.
Example:
1. Communication DTCs2. Internal Control Module DTCs3. Battery Voltage DTCs
Most importantly, the Diagnostic SystemCheck identifies all related sub-systemsthat can adversely affect the sub-systemassociated with the customer concern.
TIP: Don’t omit the Diagnostic SystemCheck. Skipping it may cause you to bypassa potential root cause for the customerconcern.
The Diagnostic System Check providesthe following information:– Identification of the control module(s)
that interact with a system– Ability of associated control module(s) to
communicate– Identification of stored diagnostic trouble
codes (DTCs) and their status
The use of the Diagnostic System Check
will identify the correct procedure fordiagnosing the system, and where theprocedure is located.
If DTCs are not present, you will bedirected to the sub-system Symptom list(which is shared with Path 2).
Path 1 – Systems that have DTCs(or depend on serial datacommunication)
The following applies to servicecategories that:– Are controlled by one or more electronic
control module(s) that communicate viathe DLC (directly or indirectly).
– Have DTCs set by one or more electroniccontrol module(s).
– Have system operation inhibited byanother electronic module.
Begin the system diagnosis with theDiagnostic Starting Point.
Example: If a customer brought in theirBuick LeSabre (with a manual HVACsystem) concerned that it is too hot in thevehicle, you would begin diagnosis at theDiagnostic Starting Point in Heating,Ventilation and Air Conditioning. From theDiagnostic Starting Point, you could link outto the Description and Operation to learnabout the system operation or link out tothe Diagnostic System Check within HVACSystems Manual.
Once in the Diagnostic System Check,you would communicate with thePowertrain Control Module (PCM) to findout if a HVAC related DTC has been set.Even though the manual HVAC system inthe LeSabre does not have a Class 2capable control module, the PCM, which isClass 2 capable, could be the cause of thecustomer concern. If a DTC P0530 hasbeen set, you would complete the P0530diagnostic. If a DTC has not been set, youwould link out to Symptoms.
Once in Symptoms, you could link out tothe Description and Operation to learnabout the system operation or link out tothe Too Hot in Vehicle diagnostic table.
Path 2 – Systems that do not haveDTCs, (or do not depend on serialdata communication)
The following applies to all servicecategories that:– Are not controlled by any electronic
control module.– Do not have DTCs set by any electronic
control module.– Do not have system operation inhibited
by another control module.
Begin the system diagnosis with theDiagnostic Starting Point.
The Diagnostic Starting Point will askyou to review the system Description andOperation. Reviewing the Description andOperation information will help determinethe correct symptom diagnostic procedure
when a malfunction exists. Reviewing theDescription and Operation information willalso help determine if the conditiondescribed by the customer is normaloperation.
Example: If a customer brought in theirAstro van (with a manual HVAC system)concerned that it is too hot in the vehicle,you would begin diagnosis at the DiagnosticStarting Point in Heating, Ventilation and AirConditioning. From the Diagnostic StartingPoint, you could link out to the Descriptionand Operation to learn about the systemoperation or link out to the Symptomswithin HVAC Systems Manual.
Once in the Symptom, you could link outto the Description and Operation to learnabout the system operation or link out tothe Too Hot in Vehicle diagnostic table. TheAstro van has a non-Class 2 HVAC ControlAssembly and does not have any PCMrelated HVAC DTCs, such as those relatingto electric cooling fans or an A/C pressuresensor.
SummaryIt is important that you begin the
diagnostic session with the DiagnosticStarting Point in the Service Category thatcorresponds to the symptom that isexhibited. The service information isorganized by the symptom that appearswhen a fault is present. Give priority to thesymptom types in the following order:
1. Warning Lamp
If a system’s warning lamp is ON, referto the system’s subsection for serviceinformation.
Example: A steering system DTCcaused the ABS lamp to be illuminated. TheDTC diagnostic will reside within ABS.
2. Message
If a message appears on the DriverInformation Center, refer to the subsectionof the indicated system for serviceinformation.
Example: The Low Coolant Levelmessage is displayed. Refer to EngineCooling for diagnosis.
3. Symptom
If there is only a symptom, refer to theappropriate subsection for diagnosis.
Example: The mirror on the driver sidedoes not operate correctly. There is a DTC,but there is not a warning lamp or amessage. Refer to the Doors subsection.
Example: The rear window defoggerdoes not operate correctly. Refer to theStationary Windows subsection.
It's important to remember DTCs areplaced into the service information basedon the symptom exhibited when the fault ispresent.
– Thanks to Mark Haning and John Bowman
4
Programming the IP Clusterafter Replacement
After replacing the instrument panelcluster on 2000-2002 Impala and MonteCarlo, it will be necessary to program theinstrument panel cluster using the Tech 2.
The Tech 2 will program the necessarycontent to permit full functionality of theinstrument panel cluster. Here’s how.– Connect your Tech 2– Select Diagnostics– “Build” the vehicle– Select Instrument Panel Cluster– Select Special Functions– Select IPC Setup
The Tech 2 will display:
– Select Enter.
The Tech 2 will display:
Once the Test in Progress is beingdisplayed, the Tech 2 will determine thenecessary calibration for the instrumentpanel cluster based on model year andproduct line.
At this point, one of three conditions willexist.
Condition 1If the Tech 2 successfully programmed
the instrument panel cluster, the Tech 2 willdisplay the following screen.
Exit will return user to the specialfunctions menu.
Condition 2The Tech 2 will read the replacement
instrument panel cluster and determinewhich cluster is being used. If an incorrectcluster has been installed, the Tech 2 willdisplay the following screen.
The Tech 2 will display:
Condition 3If the Tech 2 was unable to program the
instrument panel cluster, the Tech 2 willdisplay the following screen.
The Tech 2 will display:
If yes is selected the procedure will startover. If no is selected, the procedure will notcontinue and will exit to the special functionsmenu.
TIP: This procedure will be included in SI2000 back to model year 2000.
– Thanks to Mike Zambo
Noise in Tilt/TelescopingSteering Column
Some owners of 2001-2002 CadillacSevilles may comment on a rattle and/orclunk noise being emitted from the lowersteering column area when the vehicletravels over bumps in the road. The noisemay be caused by the lower bearing race tosteering shaft fit, or the inner to outer raceclearance within the bearing adaptorassembly.
Currently, this concern may be addressedby applying damping grease 18010909(10953487 in Canada) to the shaft areawhere the inner race contacts the shaftand/or pack the bearing adaptor assembly.
The part number above will provide 10blister packs with 1/4-ounce of grease. Referto SI 2000 Document 684655 for steeringcolumn service procedures.
– Thanks to Bill Denton
Heated SeatElements
As cold weather is here, be aware thatalmost all heated seat elements for the backand cushion are wired in series. If oneelement goes out, neither one will work. Usean ohmmeter to quickly test the elements inback and seat, and replace only the elementthat is bad.
TIP: Also, before replacing a seatelement, check to see if a repair kit isavailable.
– Thanks to Kobie Glenn
I/P SqueakOn 2001-02 Buick LeSabre, a customer
may comment on a squeak/rattle/itch noisecoming from the instrument panel directly infront of the driver. The noise may seem to becoming from around the cluster.
This condition may be caused by the tipof the A-pillar interior molding rubbing againstthe windshield. To correct this condition, firstremove the A-pillar interior molding. Next,apply a piece of adhesive-backed felt to thelower front tip of the molding where it wouldcome in contact with the windshield. Installthe molding and test drive the vehicle toverify that the noise is gone.
– Thanks to Frank Justice
U-VanInstrumentPanel ClusterReplacementParts
To minimize parts proliferation, the samemicroprocessor is used in replacementclusters for 2000 and 2001/2002 modelyears. The software is set for the 2001/2002,which is different from 2000.
When a replacement cluster is installed ina 2000 vehicle, a U1000 DTC will set. This isbecause the oil life feature is not available inthe 2000 vehicle. Ignore this DTC.
Also, the LOW COOLANT telltale will notoperate when the cluster is used in a 2000service application.
– Thanks to Doug Kinsman
5
Owners of some 2002 Chevrolet MonteCarlos and Impalas may comment that thepaint has a hazy appearance in the areaswhere the Transseal transportation protectivecoating was applied.
TIP: This may look similar to a conditionexperienced on a limited number of 2001Monte Carlos, but the cause of the conditionis different. For this reason, removing thishaze requires a different procedure than wasrecommended for the 2001 vehicles.Applying heat to the 2002 Monte Carlo paintis not required to remove the haze
Following is the revised procedure forremoving the hazy residue for the 2002models:
1. Procure naphtha/solvent, commonlyavailable from hardware or homeimprovement stores (look in the paintthinner aisle).
2. You will need several clean soft rags.
3. Pay attention to the caution on thenaphtha can.
4. On a cool car, pour the naphtha liberallyon the affected area or body panel.
5. Using a clean soft cloth, wipe the naphthaover the entire panel, turning the clothfrequently to keep a clean part of thecloth on the panel. The naphtha cuts thehaze and then the cloth picks up theresidue. If the cloth is not kept clean, theresidue will be redistributed over thepanel.
6. Once the residue is cleaned off the panel,repeat the process a second time toremove any excess residue that was notpicked up.
7. Let the car sit out for a couple of hours tosee if fog reappears.
8. If it reappears repeat steps 4-7.– Thanks to Gary McAdam
Many GM cars and trucks are equipped withan oil life system which determines when an oilchange is required. After the oil has beenchanged, it’s necessary to reset the system.
In the February and March 2000 issues ofTechLink, you were provided instructions onresetting all of the systems in existence at thattime. The following list brings you up to date.Due to space limitations only 2001, 2002 andlimited 2003 resetting procedures for trucks arepublished here. Passenger cars were publishedlast month.
The information for this article is the sameas you will find in the applicable owner orservice manual.
To find this information in SI 2000:
Select the vehicleSelect category General InformationSelect category Maintenance and LubricationSelect category Maintenance and then GM OilLife System-Resetting.
You may be able to use the Search functionusing the words Oil Life System Resetting.
TIP: You can find copies of the earlier chartson the TechLink website on the Internet athttp://service.gm.com.
2001 Aztek2002 Aztek2002 Rendezvous
If your vehicle does not have the optionalDriver Information Center (DIC) do thefollowing:
1. With the ignition key in ON but the engineoff, fully push and release the acceleratorpedal slowly three times within fiveseconds.
2. Turn the key to OFF.3. If the CHANGE ENGINE OIL message
comes back on, the engine oil life monitorhas not reset. Repeat the procedure.
If your vehicle has the optional DIC, do thefollowing:
1. Turn the ignition to ON with the engine off.
2. Press the MODE button until the DIC reads
OIL LIFE LEFT/HOLD SET TO RESET.3. Press and hold the SET button until 100% is
displayed.
You will hear three chimes and the CHANGEENGINE OIL message will go off. If theCHANGE ENGINE OIL message comes backon, the monitor has not reset. Repeat theprocedure.
2001 Montana2001 Silhouette2001 Venture2002 Montana2002 Silhouette2002 Venture
1. With the ignition key in RUN but the engineoff, repeatedly push the trip/reset buttonuntil OIL is displayed on the DriverInformation Center.
2. Once OIL is displayed, push and hold thetrip/reset button for five seconds. Thenumber will disappear and be replaced by100 (indicating 100% oil life remaining).
3. Turn the key to OFF.4. If the change engine oil message comes
back on, the engine oil life monitor has notreset. Repeat the procedure.
2002 Bravada2002 TrailBlazer2002 Envoy
1. Turn the ignition key to RUN with the engineoff.
2. Fully press and release the accelerator pedalthree times within five seconds.
3. If the CHANGE ENG OIL light flashes forfive seconds, the system is reset. If the lightdoes not flash, repeat the procedure.
2001 Sierra2001 Silverado2001 Yukon and Yukon XL2001 Tahoe and Suburban2002 Sierra Denali2002 Sierra2002 Silverado2002 Yukon and Yukon XL2002 Tahoe and Suburban2002 Avalanche
2001 Escalade2002 Escalade2002 Escalade EXT2001 Yukon Denali2002 Yukon Denali2003 Hummer H22001 Lumina2001 Regal2001 Century2002 Regal 2002 Century
1. Turn the ignition to RUN but with the engineoff.
2. Fully push and release the accelerator pedalslowly three times within five seconds.
3. If the Change Oil Soon light flashes, thesystem is resetting.
4. Turn the key to OFF.5. Start the vehicle.6. The oil life will change to 100%.7. If the Change Oil Soon light comes back on,
the system has not reset. Repeat theprocedure.
2001 B7 Chassis Medium Duty2002 B7 Chassis Medium Duty
1. Turn the ignition to START but with theengine off.
2. Fully press and release the accelerator pedalthree times within 10 seconds.
3. If the CHANGE OIL light flashes for fiveseconds, the system is reset.
4. If the light does not display for five seconds,you will need to reset the system again.
2003 560 C-Series
1. Turn the ignition to RUN but with the engineoff.
2. Fully press and release the accelerator pedalthree times within 10 seconds.
3. If the CHANGE OIL light flashes for fiveseconds, the system is reset.
4. If the light does not display for five seconds,you will need to reset the system again.
– Thanks to the Owner's Information team
Hazy Paint Appearance
News and Views
Oil Life System Reset Procedures – Trucks
Driver’s Seatback Gap
6
On a 2001 Monte Carlo equipped withleather seating, a gap may develop betweenthe driver's seat back trim and the SideImpact Airbag (SIAB). This condition iscaused by the lack of tension between theseat trim and the airbag bezel (white plasticcup attached to the seat frame).
Several improvements were implementedmidway through the 2001 model year toeliminate this condition. To correct a vehicleexhibiting this condition, check the bezel slotwidth (slots located on the forward edge ofthe bezel), and replace the part if it is 5/16-inch (7.94 mm) or greater. The new bezel,part number 88951498, has a slot width of3/16-inch (4.76 mm).
Next, measure the tabs on the seat trimplastic reinforcement that engage into therevised bezel slots, located on the forwardedge of the seat trim opening, to determineif the vehicle has the revised seat trim. Therevised seat trim has a tab length of 20 mm.The seat trim should be replaced if the tab isany shorter than this.
Finally, remove the white plastic shim thatmay be located between the seat frame andthe bezel. This shim is no longer necessarywhen the new seat bezel, described above,is used.
– Thanks to Gary McAdam
Prizm EVAPSystemConditions
Owners of 2000 -- 2002 Chevrolet Prizmsmay comment that their check engine lightcomes on, and that there are no associateddriveablity conditions. Any, or all of thefollowing codes will be present: P0440,P0441, P0446.
There are two possible causes.
Pressure Switching ValveThe pressure switching valve may be
defective. You should hear a clicking noisewhen you command the PSW on and offusing the Tech 2. If you cannot hear the valveclick, make sure there is 12 volts at thesolenoid, and that the PCM is supplying theground to the circuit when you command thevalve on. If the power and control sides ofthe solenoid are working properly, replacethe pressure switching valve.
Also verify that the air flow through thePSW is correct. When performing the airflow test, attach a hose to the inner port andthe air should come out of the outer port.When the valve is commanded on, thereshould be air flow through the valve. Whenthe valve is turned off, there should be no airflow through the valve.
The EVAP system Pressure SwitchingValve is attached to the vapor canister by asingle screw. Do not replace the completecanister assembly. The PSW can be replacedseparately. The part number for the valve is94859365.
Gas CapSome defective gas caps are being
replaced with after-market caps which willnot hold pressure.
Look for the word "Toyota" on the face ofthe cap. If you can not see the word "Toyota,"the cap is not OEM and the customer shouldbe informed that they will need a new OEMgas cap.
– Thanks to Jeff Strausser
If the owner of a 1987-present Cavalier orSunfire is concerned about a power windowmotor that does not work, or has had a shortservice life, it may be due to an incorrectreplacement part.
The original service replacement partnumber 12487630 was briefly superseded by
Power Window Motor Replacement EVAP Pressure Switching Valve
View of driver’s seatback with Side ImpactAirbag removed
TAC Tips
On some 2002 Chevrolet Impala LSmodels, the IPC may exhibit anintermittent bulb check condition every 20-40 seconds, in which all the warning lightsturn on, then off.
The OnStar VCIM is causing thiscondition. When the VCIM is discon-
nected, the concern goes away. If this isconfirmed, contact TAC to obtain a VCIMand follow the required steps to replacethe module. Also, notify TAC of the newESN and STID numbers and reset the PCtables before installing the VCIM.
– Thanks to GM Technical Assistance
Instrument Cluster Intermittent Bulb Check
a bronze-colored universal motor part number12497971. The correct part number is24015712 and is silver in color. 24015712 willwork on both current and older Cavaliers andSunfires. Part release number informationhas been corrected.
– Thanks to Bob Benedict
Owners may comment that the flasher ontheir 2000-02 full size pickup or utility modelflashes faster than on other vehicles of thesame model.
It is possible that an Export relay wasinstalled into this vehicle. Inspect the partand part number.
Part number 11516051 for RPO optionT79 (lamps, rear fog, export) is a relay which
Turn Signal Flashes Fastoperates 3 turn signal lights and 6 hazardlights.
Part number 12450072 relay operates 2turn signal lights and 4 hazard lights(domestic).
Use part number 12450072 to fix thisconcern.
– Thanks to GM Technical Assistance
Check tabs forappropriate 20 mmlength
7
Owners of some 2001-2002 Alero, GrandAm and Malibu models may comment on acreak or squeak noise when opening orclosing one or more doors on their vehicle.
This noise may be coming from the checklink spring saddle. To correct the noise, slidethe check link grommet back and spray GMSpray Lube 12346293 (992723 in Canada), orequivalent, on the check link saddle, using astraw type nozzle extension. The nozzleextension should be inserted slightly into theopening above the check link arm andsprayed toward the outside of the door. If thenozzle is inserted too far into the door, it willgo past the target area. Move the nozzleback and forth while spraying to distributethe lubricant. Open and shut the door towork the lubricant into the check link untilthe noise is gone.
– Thanks to Dave Dickey
AC Control HeadKnob Replacement
On 1999-2002 Pontiac Grand Am andGrand Prix, the mode control or blowerspeed control knob is replaceable individually,if the knob becomes stripped or broken. It isnot necessary to replace the entire controlhead in these cases.
Replacement part numbers:
1999-2002 Grand Prix 9363337
1999-2000 Grand Am 9363337
2001-2002 Grand Am 9380265
– Thanks to Fred Tebbets
Front and Rear Door CheckLink Noise
This review of service bulletinsreleased through mid-January lists thebulletin number, superseded bulletinnumber (if applicable), subject andmodels.
GENERAL INFORMATION:01-00-90-002; Achieving Correct Oil
Level and Crankcase Capacity Revision;2002 Chevrolet Cavalier, OldsmobileAlero, Pontiac Grand Am, Sunfire with2.2L Ecotech Engine (VIN F, RPO L61)
HVAC:01-01-39-005; Noise or Vibration in
Passenger Compartment with A/C onBetween 2000-2400 RPM (ReplaceHeater Outlet Hose); 2002-02 Chevroletand GMC Pickup Models with 4.3L V6Engine (VIN W -- RPO L35) and AirConditioning (RPO C60)
STEERING:01-02-32-001A; replaces 01-02-32-001;
Clunk Noise From Front of VehicleDuring Turning Maneuver/SteeringWheel Rotation (Lubricate IntermediateShaft); specified 1997-2002 Buick,Cadillac, Chevrolet, Oldsmobile, andPontiac models
01-02-35-008; Electronic SteeringColumn Lock May Refuse to Operate –DIC Service Message Displayed (UpdateColumn Lock Wiring, Install RevisedRelay and/or Replace Electronic ColumnLock); 1997-98 and 2000 Chevrolet
Corvette
01-02-35-010; Revised Lock CylinderReplacement; 1995-01 ChevroletCavalier, Pontiac Sunfire
SUSPENSION:01-03-08-005; Lower Control Arm
Bracket to Frame Fastener TorqueSpecification and Tightening Sequence;2002 Chevrolet and GMC S/T Utility,Oldsmobile Bravada
01-03-10-009; Replace Wheel NutCovers Missing and/or Loose (ReplaceMissing Covers and Add Sealant to AllCovers); 2002 and All Prior YearPassenger Cars (except Cadillac) withPlastic Wheel Nut Covers
01-03-10-010; Inspection of Tire andWheel Size Prior to Diagnosis ofTransmission Shifts, Poor Performance,Speedometer, Cruise Control Concerns;2001-02 Chevrolet and GMC C/K withDuramax Diesel Engine and AllisonTransmission
DRIVELINE AXLE:01-04-21-001; Transfer Case-Steyr --
Revised Fastener TighteningSpecification; 2001-02 Chevrolet,Pontiac, Oldsmobile Vehicles with All-Wheel Drive (RPO M76)
BRAKES:00-05-22-002A (replaces 00-05-22-
002); Brake Rotor Warranty Service
Procedure; 1995-2002 Passenger Carsand Light Duty Trucks
01-05-23-002A (replaces 01-05-23-002); Front Disc Brake Pulsation (NewRotor Run-Out Specification andCorrection Method; 1997-2002 ChevroletMalibu, Oldsmobile Cutlass, OldsmobileAlero, Pontiac Grand Am
01-05-25-004A (replaces 01-05-25-004); Yellow: Traction Control/HandlingLamp On and DIC Displays ServiceActive Hndlg (Repair/Reprogram ABSModule); 2002-02 Chevrolet Corvette
ENGINE/PROPULSIONSYSTEM:
01-06-01-026; Oil Filter Usage; 2002Chevrolet and GMC S/T Utility Modelsand Oldsmobile Bravada with 4.2L Inline6-cylinder Engine (VIN S – RPO LL8)
01-06-01-027; Revised Cylinder HeadInstallation and ReplacementProcedures; Specified 1997-2002 Carsand Trucks with 4.8L, 5.3L, 5.7L or 6.0LEngine (VINs V, T, Z, G, S, U, N – RPOsLR4, LM7, L59, LS1, LS6, LQ4, LQ9)
01-06-01-028; Engine Knock on ColdStart; 1999-2002 Chevrolet and GMCC/K, 2002 Cadillac Escalade
01-06-01-029; Higher Than ExpectedEngine Oil Consumption (Replace PCVValve); 1999-2002 Chevrolet and GMCC/K, 2002 Cadillac Escalade with 5.3L or6.0L Engine (VINs T, N, U – RPOs LM7,LQ9, LQ4)
01-06-01-030; Higher Than Expected
Link removed to show lubrication location
Lubricating check link saddle
Bulletins – January 2002
continued on page 8
8
Engine Oil Consumption (ReplaceRocker Arm Cover); 1998-2002Chevrolet Cavalier, Pontiac Sunfire,Chevrolet and GMC S Truck with 2.2LEngine (VINs 4, 5 – RPOs LN2, L43)
01-06-02-012; Water Pump Weep(Install Coolant Collector); specified1996-2002 passenger cars with 2.4LEngine (VIN T – RPO LD9)
01-06-02-013; Radiator Surge TankCap Contacts Underside of Hood(Reposition Radiator Surge Tank); 1998-2002 Chevrolet and GMC C7500 MDConventional Cab with Caterpillar®Diesel and Access Hood RPO BQC)
01-06-04-037A (replaces 01-06-04-037); SES Light On with DTCs P0716and/or P0717 Set (Repair Input SpeedSensor Wiring at Transaxle Wiring Pass-through Connnector; Specified Buick,Chevrolet, Oldsmobile, Pontiac vehicles
01-06-04-044; Test Guidelines for Useof Essential Tool J 41413-200 EvapSystem Tester; 2002 and PriorPassenger Cars and Trucks with Non-Enhanced and Enhanced EVAP Systems
01-06-04-052; OBD SystemImprovements (Reprogram PCM) – SESLight On, DTC P0014, P0116 or P1683Set, Delayed Transmission Downshiftand/or Excessive Fan Noise; 2002Chevrolet and GMC S/T Utility,Oldsmobile Bravada
01-06-04-053 (replaces 86-63-19);Auxiliary Fuel Tank Removal Procedure;1998-02 Chevrolet and GMC C/K3500HD with Auxiliary Fuel Tank
01-06-05-006; Exhaust SystemRumble/Rattle Noise (Replace ExhaustPipe Seals and Modify Exhaust PipeRing Flanges); specified 1996-2002Chevrolet, GMC, Cadillac models
TRANSMISSION/TRANSAXLE:
01-07-30-023A; replaces 01-07-30-023;Harsh 1-2 Upshift, SES, MIL, or CELIlluminated, DTC P1870 Set (ReplaceValve Body); specified 1996-2000Passenger Cars and LD Trucks with4L60-E Automatic Transmission (RPOM30)
01-07-30-029; New Product FeedbackForm and Process for AutomaticTransmission Core Returns; 1980-2002Passenger Cars and Trucks with OE andGoodwrench Automatic Transmission
01-07-30-036; SES Lamp Illuminated,Incorrect Transmission Shifts, PoorPerformance of Engine, TransmissionSlipping (Clean Transmission Valve Bodyand Case Oil Passages of Debris);Specified 2000-02 Cars and Trucks
01-07-30-038; DTC P0757 Set, SESLamp Illuminated, Poor Performance of
Transmission, Transmission Slipping(Clean Transmission Valve Body andCase Oil Passages of Debris); specified1999-2002 cars and trucks
01-07-30-039; 4T40E or 4T45ETransmission Transaxle Changes for2002 Model Year; 2002 ChevroletCavalier, Malibu, Oldsmobile Alero,Pontiac Grand Am, Sunfire
01-07-31-002; Improved BleedingProcedure for Hydraulic Clutch ReleaseSystem; 2002 and Prior Passenger Carsand LD Trucks, Chevrolet and GMC T-Series MD Tilt Cab Models
01-07-31-003; Clutch Slipping or EarlyClutch Failure (Replace Clutch Assemblyand Update Clutch Release System);1997-2000 Chevrolet and GMC F ModelMD Tilt Cab with Eaton Solo 14 InchClutch (RPO MPK) or Valeo 14 InchClutch (RPO MTD)
BODY AND ACCESSORIES:01-08-44-008A (replaces 01-08-44-
008); New Tool Availability for AntennaMast Installation During Pre-Delivery;2001-02 Chevrolet and GMC C/K Pickup,Utility, M/L Van, 2002 Cadillac Escalade,Chevrolet Avalanche
01-08-44-014; Erratic or IntermittentOperation of Radio; 2002 ChevroletCamaro, Corvette, Chevrolet and GMCC/K and S/T Pickup and Utility, 2002 M/LVans, Cadillac Escalade with RPO UL0,UN0 or UL9
01-08-44-016; Travel Note RecorderMessage Deletion During Pre-Delivery;2002 Chevrolet and GMC S/T Utility,Oldsmobile Bravada
01-08-46-006A (replaces 01-08-46-006); Revised OnStar® Antenna CouplingReplacement Procedures; 2000-02Passenger Cars and Trucks with GlassMounted Antenna
01-08-46-008A (replaces 01-08-46-008); Information on Upgrading FactoryInstalled OnStar® Generation 2.0 toGeneration 2.6; 2000 passenger carsand trucks equipped with OnStar
01-08-47-002; Backlighting on Driverand Passenger Door Switches RemainsOn, High Parasitic Current Draw Occurs(Replace HTR & A/C Programmerassembly – IP Module); 2000-02 BuickLeSabre Limited, Oldsmobile Aurora,Pontiac Bonneville with RPO CJ2
01-08-49-018; Center Floor ConsoleRear Power Outlet Replacement Covers;2001-02 GMC Utility, 2002 CadillacEscalade
01-08-56-006; Security LampIlluminated on IP, Engine Stalls, No Start,DTC B2960 (Security System SensorData Incorrect but Valid) Set (Inspect andRepair Cause of DTC B2960); 1998-2001Chevrolet and GMC G-Van Models
01-08-57-006; General WaterleakDiagnosis Guide; 1997-2002 ChevroletVenture, Oldsmobile Silhouette, PontiacTransSport/Montana
01-08-56-007; General WaterleakDiagnosis Guide; 1999-2002 ChevroletMalibu, Oldsmobile Alero, Pontiac GrandAm
01-08-64-017; Outside RearviewMirror Shake/Inoperative (Replace MirrorMotor Assembly); 2002 BuickRendezvous
01-08-64-018; Front Door WindowGlass Won’t Roll Up, or Out of Channel(Replace Guide); 1999-2002 OldsmobileAlero, Pontiac Grand Am
01-08-64-019; Click or Ratchet TypeNoise from Outside Rearview Mirrors;2002 Chevrolet and GMC Utility Modelsand Oldsmobile Bravada
01-08-64-020; Creak Noise WhenOpening or Closing Doors (ApplyLubricant to Check Link); 2001-02Chevrolet Malibu, Oldsmobile Alero,Pontiac Grand Am
01-08-65-001; Fuel Filler DoorRecessed Into Quarter Panel (ReplaceFuel Filler Pocket); 1999-2002 ChevroletCavalier, Pontiac Sunfire
01-08-66-013; End Gate Lock CylinderLoose (Replace Lock Cylinder); 2002Chevrolet Avalanche
01-08-66-014; Pickup Box Sheet MetalFracture/Damage with AftermarketAccessories Installed (Repair Pickup Boxand Install Reinforcements); 1999-2002Chevrolet and GMC C/K Pickup SteelFleetside (RPO E63)
01-08-66-015; End Gate Handle Binds(Replace Handle); 2002 ChevroletAvalanche
01-08-97-002; ProgrammingHomeLink® Transmitter; 2000-02Passenger Cars and Trucks with RPOUG1
01-08-111-003; Roof Panel Joint(Ditch) Molding; 2000-02 ChevroletImpala
RESTRAINTS:99-09-40-007A; replaces 99-09-40-007;
Front Seat Shoulder Belt isUncomfortable (Replace Both Front SeatShoulder Belt Retractors, Shoulder BeltGuides and Push-on Nuts); 2000Chevrolet Monte Carlo
01-09-41-010; Air Bag IndicatorIlluminated After Replacement ofSensing and Diagnostic Module (SDM),DTC B1001 (Reprogram Body ControlModule – BCM -- to Accept New SDM);
2002 Buick Rendezvous, 2001-02Pontiac Aztek
Bulletins – January 2002 continued from page 7
