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Mechanic’s Education Association
www.MEAtraining.com Instructor: Al Dambrauskas
RVC Regulated Voltage ControlRegulates Alt Output Based On Battery State of
Charge and Estimated Battery Temperature
Extends Battery Life and Improves Fuel Mileage
2004 and Newer Trucks and Cars
Generator Battery Control Module (GBCM)
Body Control Module (BCM)
Engine Control Module (ECM)
Dash Integration Module (DIM)
Instrument Panel Module (IPM)
Instrument Panel Cluster (IPC)
Battery Current Sensor
2
9 Modes Of Operation
• Charge Mode
• Fuel Economy Mode
• Voltage Reduction Mode
• Start Up Mode
• Headlamp Mode
• Battery Sulfation Protection Mode
• Windshield Wiper Voltage Boost Mode
• Fuel Pump Voltage Boost Mode
• De – Ice Voltage Boost Mode
Battery Must Be Charged: System May Not Turn On Alternator If Voltage Is Too Low
• Charge Mode: – Battery SOC Is Less Than
80%– Cooling Fans On High
Speed– Rear Defogger On– Current Sensor NOT
Between – 8 to 15 amps– Outside Air Temp Is Less
Than 0 Celsius
9 Modes Of Operation
• Fuel Economy Mode: – Battery SOC Is More Than 80%– Cooling Fans On Low Speed Or
Off– Rear Defogger Off– Current Sensor Is Between Or Less
Than – 8 to 15 amps– Outside Air Temp Is More Than 0
Celsius
In this mode: alternator output will be ramped up to 13.4v – 15.5v at a rate of 20 milli-volts per second
In this mode: when all
criteria is met, the target
voltage will be 13.0 volts
3
• Voltage Reduction Mode: – Battery SOC Is More Than 80%– Cooling Fans On Low Speed Or Off– Rear Defogger Off– Current Sensor Is Between Or Less
Than – 7 to 2 amps– Outside Air Temp Is More Than 0
Celsius
9 Modes Of Operation
In this mode:
Voltage can Reduced To 12.9 Volts
12.9V
• Start Up Mode: – Voltage Target Is 14.5
Volts for 30 Seconds
14.5V
• Battery Sulfation Mode: – Alternator Output Has Been
13.2 volts For More Than 45 Minutes
– Will Enter Charge Mode For 3 Minutes To See If Battery Voltage Comes Up
9 Modes Of Operation
13.2V
4
9 Modes Of Operation
• Headlamp Mode
• Windshield Wiper Voltage Boost Mode
• Fuel Pump Voltage Boost Mode
• De – Ice Voltage Boost Mode
Voltage Is Increased When Any Of These
Accessories Are Turned On To Maintain SOC
RVC: Regulated Voltage Control
2 Types Of RVC Systems and
Stand Alone RVC: Integrated RVC:
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SARVC: Stand Alone Regulated Voltage Control
Alternator With New Style Regulator
Battery Control Module With Internal Current Sensor
PCM Communicate With Battery Control Module By
Class 2 Data
Instrument Panel Cluster Communicates Over Class 2 To Notify Driver Of Charging
System Malfunctions Mounted On Negative Battery Cable Near
Battery
2007 GMC Sierra P/U SARVC
Stand Alone Regulated Voltage Control
Used On Trucks
L Terminal Charge Indicator
Control
F Terminal Generator Field
Duty Cycle Signal
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2007 GMC Sierra 3500 P/U 6.0L SARVC
Generator Battery Control Module
ALT IPC
Terminal F
Terminal L
Current Sensor Internal
Power Feeds
Grounds
Class 2 Communication
Engine On Signal
Pin B: Grey Wire
F TerminalPin D: Brown
WireL Terminal
Generator Battery Control Module Pins
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SARVC: Stand Alone Regulated Voltage Control (Under Load)
L Terminal @ 128Hz: Voltage Aprox. 2.60 Volts ( 0 – 4 volts )
F Terminal @ 400Hz: Voltage Aprox. 6.94 Volts ( 0 – 9 volt )
L Terminal Voltage
Varies From Aprox, 2 – 4
volts
F Terminal Voltage
Varies From Aprox, 3 – 8
volts
Pin G: Engine On Signal (Dark Blue Wire)
Generator Battery Control Module Engine On Signal
.5 volts Key On
13.78 volts Running
8
RVC: Regulated Voltage Control
Works With 2 Wire To Alternator L and F
128 Hz Signal Is Sent To Alt on L Terminal: 0 To 5 volt
Square Wave
Duty Cycle Control on L Terminal Sets Regulator In
Alternator
F Terminal Is Feedback From Alternator (@ 400Hz)
Orange: Generator Turn On Signal: .148 volts
KOEO, 3.97 volts Running Open Circuit
Grey: Generator Field Duty Cycle Signal:
.007 volts KOEO.047 volts Running Open
Circuit
Orange: Generator Turn On Signal (L) 3.67 volts Varying
Grey: Generator Field Duty Cycle (F) 6.08 volts Varying
Alternator At Idle
If “L” Terminal Is Open or Grounded, Alternator Will Default To 13.8 volt Output
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Command On “L” Terminal To Change Regulator Set Point
If Command Is Less Than 10% or Higher Than 90% Alternator Defaults To Internally Regulated
At 13.8 volts
Normal Range
Scan Data
L Terminal Command
F Terminal Load Feedback
60% Command Would Result In Alternator Outputting 13.81 volts
10
Alternator No Load
L Terminal 0 – 5 volt Square Wave
F Terminal 0 – 7 volt Square Wave
Alternator Heavy Load
Limitation Using Scope
11
Scan DataEPM Data
SOC 88%
Desired Voltage
Voltage
2008 Impala 5.3L V8 RVC
Current Sensor Terminal L
Terminal FBody Control Module
ECM
12
2008 Impala 5.3L v8
Battery Current SensorOpen Circuit KOEO
Pink: (Reference Voltage) 5.10 volts
Brown: (Signal Ground) .081 volts
White: (Signal) 5.09 volts
Battery Current Sensor
White: Signal 3.5 volts, Frequency 120Hz, Duty
Cycle 32%
13
Battery Current Sensor
0 – 5 volt Square Wave
Functional Tests
Generator L-Terminal
Control
14
Functional Tests
Generator L-Terminal
Control
L-Terminal Normal Operation
5 Volt Square Wave @ Aprox.
75% Duty Cycle
Command From PCMVoltage On
Meter Will Be Aprox. 14.5
volts
15
Functional Tests Generator L Terminal Command On To 85%
L Terminal @ 85% Duty
CycleVoltage On Meter Goes
To Aprox. 15 volts
Functional Tests Generator L Terminal Command On To 15%
L Terminal @ 15% Duty
CycleVoltage On Meter Goes
To Aprox. 12 volts
16
Battery Saver MessageBattery Voltage High:
System Voltage Is Greater Than 16 Volts
Battery Voltage Low:
System Voltage Is Less Than 11 Volts
Battery Saver Active:
One or More System Is Altered To Reduce Load On Charging System
Idle Boost
17
Load Shedding
BCM Monitors Battery For Excessive Loads
BCM Strategy Is To Lower Loads To Save
Battery
Can Be Monitored On Scan Tool
Loads Subject To Periodic Deactivations
Air Conditioning Clutch
Heated Mirrors
Heated Seats
Rear Window Defogger
HVAC Blower
18
Load Shed Level
Affected Systems Action Taken
Load Shed
Level 0
No System Affected
Normal Operation
Load Shed
Level 1
Load Shed
Level 2
Load Shed
Level 3
Load Shedding
Message Center
Message Center
Message Center
Heated Rear View Mirrors Cycled at 80% Duty Cycle, Off for 4 of every 20 second cycle
No Messages or Indicators Displayed
Heated Rear View Mirrors, Rear Defrost,
Heated Seats
Heated Rear View Mirrors, Rear Defrost,
Heated Seats
Cycled at 50% Duty Cycle, Off for 10 of every 20 second cycle
“Battery Saver Action” Message Displayed, or Flashing Indicator
Turned Off
“Battery Saver Action” Message Displayed, Battery charging system Indicator on
2003 Chevrolet Impala 3.4LOver Heats
19
Isolate Splice Pack 205
Find The Splice Pack SP205
20
Disconnect Body Module
Communication Wire
Splice Pack 205
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