Wiring Schematics 101

Electrical Symbols

• Supplemental Inflatable Restraint (SIR) or Supplemental Restraint System (SRS) Icon

• This icon is used to alert the technician that the system contains SIR/SRS components that require certain precautions before servicing.

• Voltage Indicator Boxes

• These boxes are used on schematics to indicate when voltage is present at a fuse.

• Partial Component• When a component is

represented in a dashed box, the component or its wiring is not shown in its entirety.

• Entire Component

• When a component is represented in a solid box the component or its wiring is shown in its entirety.

• Fuse

• Circuit Breaker

• Fusible Link

• Connector Attached to Component

• Pigtail Connector

• Bolt On or Screw On Eyelet Terminal

• Inline Harness Connector

• Splice

• Pass Through the Grommet

• Chassis Ground

• Case Ground

• Single Filament Light Bulbs

• Double Filament Light Bulb

• Light Emitting Diodes

• Capacitor

• Battery

• Resistor

• Variable Resistor

• Position Sensor

• I/O Resistors

• I/O Switches

• Diode

• Crystal

• Heating Elements

• Motor

• Solenoid

• Coil

• Switches

• Single Pole Single Throw Relay

• Single Pole Double Throw Relay

AWG CHART

(Gauge) (Inches)

8/0 0.7314

7/0 0.6514

6/0 0.5801

5/0 0.5166

4/0 0.4600

3/0 0.4096

2/0 0.3648

0 0.3249

10 0.1019

11 0.0907

12 0.0808

14 0.0641

16 0.0508

(Gauge) (Inches)

18 0.0403

19 0.0359

20 0.0320

21 0.0285

22 0.0253

23 0.0226

24 0.0201

25 0.0179

26 0.0159

27 0.0142

28 0.0126

29 0.0113

30 0.0100

How to Use Electrical Schematics• Important

• The schematic does not represent the components and wiring as they physically appear on the vehicle. For example, a 4-foot length of wire is treated no differently in a schematic from one which is only a few inches long.

• When diagnosing a horn problem use the service information located in the Horns service category. The following schematic is a typical example of a schematic with its supporting text.

Schematics use a top (power) to bottom (ground) sequence to present electrical information.

Power Window IP Fuse Block

Window Circuit Breaker Amp

Hot in Run

343

2YEL

S305

D C301

P500

C2 L

2 DK BLU 164

S504

G110

Engine Controls Components

Name Location Locator View Connector End View

Body Control Module (BCM)

On the lower left side of the IP below the steering column

Body Control System Component Views in Body

Control System

Body Control System Connector End Views in Body

Control System

Camshaft Position (CMP)

Sensor In the distributor

Engine Controls Component Views

Engine Controls Connector End Views

Vehicle Speed Sensor (VSS)

In the extension housing on the left side of the transmission

Engine Controls Component Views

Engine Controls Connector End Views

C202 On the left side of the IP on the back of the cluster

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

G100 On the left radiator support bracket

Power and Grounding Component Views in Wiring

Systems --

G102 On the right front of the engine block (4.3L)

-- --

G106 On the right front of the engine block (4.3L)

-- --

P100 At the left rear of the engine compartment in the front of the dash

Power and Grounding Component Views in Wiring

Systems --

Splice Pack 203 (SP203)

On the top left side of the IP near the A pillar

Harness Routing Views in Wiring Systems

--

Splice Pack 205 (SP205)

On the left side of the IP behind the headlamp switch

Data Link Communications Component Views in Wiring

Systems

Data Link Communications Connector End Views in

Wiring Systems

S101 In the forward lamp harness

-- --

S102 In the engine harness -- --

S103 In the engine harness -- --

FRT DOOR COMPONET LOCATOR

1 S504 (Left), S601 (Right)

2 S600 (Right)

3 S506 (Left)

4 S605 (Right

5 Front Power Window Switch Connector (C1)

6 Front Power Window Switch Connector (C2)

7 Power Door Lock Switch Connector

8 Front Door Lock Motor

9 Front Door Lock Motor Connector

10 S505 (Left), S603 (Right)

11 Speaker Connector

12 P500 (Left), P600 (Right)

ZoningAll grounds, in-line

connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The following table explains the

numbering system

Callout Numbers Zone Description

100-199 Engine compartment (All forward of the dash panel)001-099 are additional for the engine compartment (Only to be used if all 100-199 items are used)

200-299 Within the instrument panel area

300-399 Passenger compartment (From instrument panel to the rear wheelhouse)

400-499 Luggage compartment (From the rear wheelhouse to the rear of the vehicle

500-599 Within the left front door

600-699 Within the right front door

700-799 Within the left rear door

800-899 Within the right rear door

900-999 Within the liftgate or endgate door

CONNECTOR END VIEWS

Door Lock Switch Connector

Connector Part Information 12064998 8-Way Female M/P 280 Series

Pin Wire Color Circuit No. Function

A -- -- Not Used

B ORN 640 Fuse Output Battery Type 3 Fuse

C BLK 1050 Ground

D LT BLU 195 Power Door Lock Relay Feed Lock Coil

E -- -- Not Used

F ORN 640 Fuse Output Battery Type 3 Fuse

G BRN 9 Park Lamp Feed

H WHT 194 Power Door Lock Relay Feed Unlock Coil

Power Windows Circuit Description

• A permanent motor operates each of the power windows. Each motor raises or lowers the glass when voltage is supplied to the motor. The direction that the motor turns depends on the polarity of the supply voltage that the switch provides.

• The LH front power window master switch controls all of the window motors. The passenger window also has a separate switch.

• Each motor is protected by a built-in circuit breaker. The circuit breaker opens the circuit if the window switch is held down too long and the following conditions apply:

• The window is obstructed • The window is full up • The window is fully down • The circuit breaker automatically resets while cooling.• When the ignition switch is turned to the RUN position, CKT 343 (YEL) supplies

battery voltage to the LH front power window master switch.• When you operate any of the UP switches, battery voltage is supplied to the window

motor. the voltage is grounded through the DN contact. The motor runs in order to drive the window up. When you operate any of the DN switches, battery voltage is supplied to the window motor in the opposite direction. The window motor is grounded through the UP contact. The motor runs in order to drive the window down.

TIME FOR EXTRA WORK