GM Service Manual Online
For 1990-2009 cars only

Name

Location

Locator View

Connector End View

Air Brake Pressure Gauge

On the left side of the IP, to the right of the steering column, in the right accessory trim plate, the top gauge

Air Brake System Component Views in Air Brakes

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Air Brake Pressure Gauge Lamp

On the left side of the IP, to the right of the steering column, in the right accessory trim plate, inserted into the gauge

Lighting Systems Component Views

Lighting Systems Connector End Views

Ammeter

On the left side of the IP, to the right of the steering column, in the right accessory trim plate, the bottom gauge

Engine Electrical Component Views in Engine Electrical

Engine Electrical Connector End Views in Engine Electrical

Automatic Transmission Fluid (ATF) Temperature Gauge

On the left side of the IP, to the right of the steering column and right of the automatic transmission (AT) selector control

Instrument Panel, Gages, and Console Component Views in Instrument Panel, Gauges, and Console

Instrument Panel, Gages, and Console Connector End Views in Instrument Panel, Gauges, and Console

Automatic Transmission Fluid (ATF) Temperature Gauge Sensor

On the lower right rear of the radiator, on the transmission oil cooler inlet fitting

Instrument Panel, Gages, and Console Component Views in Instrument Panel, Gauges, and Console

Instrument Panel, Gages, and Console Connector End Views in Instrument Panel, Gauges, and Console

Automatic Transmission (AT) Oil Temperature Gauge

On the left side of the IP, to the right of the steering column and right of the automatic transmission (AT) selector control

Instrument Panel, Gages, and Console Component Views in Instrument Panel, Gauges, and Console

Instrument Panel, Gages, and Console Connector End Views in Instrument Panel, Gauges, and Console

Automatic Transmission (AT) Oil Temperature Gauge Sensor

On the lower right rear of the radiator, on the transmission oil cooler inlet fitting

Instrument Panel, Gages, and Console Component Views in Instrument Panel, Gauges, and Console

Instrument Panel, Gages, and Console Connector End Views in Instrument Panel, Gauges, and Console

Automatic Transmission (AT) Selector Control

On the left side of the IP, to the right of the steering column, on the center accessory trim plate

Instrument Panel, Gages, and Console Component Views in Instrument Panel, Gauges, and Console

Instrument Panel, Gages, and Console Connector End Views in Instrument Panel, Gauges, and Console

Backup Lamps Switch (Automatic Transmission)

On the lower right side of the transmission

Lighting Systems Component Views

Lighting Systems Connector End Views

Backup Lamps Switch (Manual Transmission)

On the top of the transmission, left of the gear shift lever

Lighting Systems Component Views

Lighting Systems Connector End Views

Daytime Running Lights (DRL) Control Module

On the left kick panel, in the DRL harness

Lighting Systems Component Views

Lighting Systems Connector End Views

Daytime Running Lights (DRL) Diode Module

Under the right side of the IP, approximately 15 cm (5.9 in) from the relay center breakout

Lighting Systems Component Views

Lighting Systems Connector End Views

Daytime Running Lights (DRL) Relay

In the mini-relay center, position D

Lighting Systems Component Views

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Driver Information Center (DIC) (Cat® Diesel)

On the left side of the IP, part of the instrument panel cluster (IPC)

Instrument Panel, Gages, and Console Component Views in Instrument Panel, Gauges, and Console

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C1 (11 cavities)

In the IP harness, to the DIC

Instrument Panel, Gages, and Console Component Views in Instrument Panel, Gauges, and Console

Instrument Panel, Gages, and Console Connector End Views in Instrument Panel, Gauges, and Console

C2 (11 cavities)

In the IP harness, to the DIC

Instrument Panel, Gages, and Console Component Views in Instrument Panel, Gauges, and Console

Instrument Panel, Gages, and Console Connector End Views in Instrument Panel, Gauges, and Console

Driver Information Center (DIC) (Gasoline)

On the left side of the IP, part of the instrument panel cluster (IPC)

Instrument Panel, Gages, and Console Component Views in Instrument Panel, Gauges, and Console

Instrument Panel, Gages, and Console Connector End Views in Instrument Panel, Gauges, and Console

C1 (11 cavities)

In the IP harness, to the DIC

Instrument Panel, Gages, and Console Component Views in Instrument Panel, Gauges, and Console

Instrument Panel, Gages, and Console Connector End Views in Instrument Panel, Gauges, and Console

C2 (11 cavities)

In the IP harness, to the DIC

Instrument Panel, Gages, and Console Component Views in Instrument Panel, Gauges, and Console

Instrument Panel, Gages, and Console Connector End Views in Instrument Panel, Gauges, and Console

Driver Information Center (DIC) (GM Diesel)

On the left side of the IP, part of the instrument panel cluster (IPC)

Instrument Panel, Gages, and Console Component Views in Instrument Panel, Gauges, and Console

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C1 (11 cavities)

In the IP harness, to the DIC

Instrument Panel, Gages, and Console Component Views in Instrument Panel, Gauges, and Console

Instrument Panel, Gages, and Console Connector End Views in Instrument Panel, Gauges, and Console

C2 (11 cavities)

In the IP harness, to the DIC

Instrument Panel, Gages, and Console Component Views in Instrument Panel, Gauges, and Console

Instrument Panel, Gages, and Console Connector End Views in Instrument Panel, Gauges, and Console

Flasher/ Relay Center

In the right side of the IP

Power and Grounding Component Views

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Hazard Warning Switch

On the left side of the IP, to the right of the steering column, on the right accessory trim plate

Lighting Systems Component Views

Lighting Systems Connector End Views

HAZARD Warning Name Plate

On the left side of the IP, to the right of the steering column, on the right accessory trim plate,

Lighting Systems Component Views

Lighting Systems Connector End Views

Headlamp, Left High/ Low

On the left front side of the hood

Lighting Systems Component Views

Lighting Systems Connector End Views

Headlamp, Right High/ Low

On the right front side of the hood

Lighting Systems Component Views

Lighting Systems Connector End Views

Headlamps Dimmer Switch

On the left side of the lower part of the steering column 3  in below steering column bracket

Lighting Systems Component Views

Lighting Systems Connector End Views

Headlamps Switch

On the left side of the IP, to the left of the instrument panel cluster (IPC)

Lighting Systems Component Views

Lighting Systems Connector End Views

IP Lamps Dimmer Switch

On the left side of the IP, to the left of the instrument panel cluster (IPC)

Lighting Systems Component Views

Lighting Systems Connector End Views

Instrument Panel Cluster (IPC)

In the left side of the IP

Instrument Panel, Gages, and Console Component Views in Instrument Panel, Gauges, and Console

Instrument Panel, Gages, and Console Connector End Views in Instrument Panel, Gauges, and Console

Low Air Pressure Switch

Under the left side of the IP

Lighting Systems Component Views

Instrument Panel, Gages, and Console Connector End Views in Instrument Panel, Gauges, and Console

MaxiFuse® Block/ Mini-Relay Center

On the right side of the IP, under the access cover

Power and Grounding Component Views

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MaxiFuse® Block 1

On the right side of the IP, under the access cover, on the left side of the MaxiFuse® block/ mini-relay center

Power and Grounding Component Views

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MaxiFuse® Block 2

On the right side of the IP, under the access cover, on the center of the MaxiFuse® block/ mini-relay center

Power and Grounding Component Views

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Mini-Relay Center

On the right side of the IP, under the access cover, on the right side of the MaxiFuse® block/ mini-relay center

Power and Grounding Component Views

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Multifunction Switch

On the left side of the steering wheel (contains the turn signal, windshield wiper, and windshield washer switches and controls the headlamps dimmer switch)

Lighting Systems Component Views

Lighting Systems Connector End Views

Park and Turn Signal Lamp, Left Front

On the top of the left front fender

Lighting Systems Component Views

Lighting Systems Connector End Views

Park and Turn Signal Lamp, Right Front

On the top of the right front fender

Lighting Systems Component Views

Lighting Systems Connector End Views

Park Brake Switch (ABS-Air)

On the right side of the IP, on the park brake valve

Lighting Systems Component Views

Lighting Systems Connector End Views

Park Brake Switch (ABS Hydraulic)

On the left kick panel, to the right rear of the park brake lever

Instrument Panel, Gages, and Console Component Views

Instrument Panel, Gages, and Console Connector End Views

Turn Signal Switch

On the left side of the steering wheel, part of the multifunction switch

Lighting Systems Component Views

Lighting Systems Connector End Views

Turn/ Hazard Flasher

In the flasher/ relay center, position 1-B

Lighting Systems Component Views

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Upfitter Connector (C212, 23 cavities)

Under the left side of the IP, by the left kick panel

Power and Grounding Component Views

Power and Grounding Connector End Views

Upfitter Connector Jumper (Shunt) (23 cavities)

Under the left side of the IP, by the left kick panel

Power and Grounding Component Views

Power and Grounding Connector End Views

C102 (7 cavities)

In the forward lamps harness, to the engine harness, on the right lower front of the hood, under the right headlamp

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Inline Harness Connector End Views in Wiring Systems

C200 (56 cavities) (Cat® Diesel)

In the IP harness, to the engine harness, under the right side of the IP

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Inline Harness Connector End Views in Wiring Systems

C200 (56 cavities) (Gasoline)

In the IP harness, to the engine harness, under the right side of the IP

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Inline Harness Connector End Views in Wiring Systems

C200 (56 cavities) (GM Diesel)

In the IP harness, to the engine harness, under the right side of the IP

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Inline Harness Connector End Views in Wiring Systems

C223 (2 cavities) (ABS-Hydraulic)

In the park brake switch jumper, to the IP harness, in the left kick panel, over the rear park brake lever

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Inline Harness Connector End Views in Wiring Systems

C409 (8 cavities) (Cat® Diesel)

In the engine harness, to the transmission harness, on the left side of the engine, at the bellhousing

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Inline Harness Connector End Views in Wiring Systems

C409 (8 cavities) (Gasoline)

In the engine harness, to the transmission harness, on the left side of the engine, at the bellhousing

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Inline Harness Connector End Views in Wiring Systems

C409 (8 cavities) (GM Diesel)

In the engine harness, to the transmission harness, on the left side of the engine, at the bellhousing

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Inline Harness Connector End Views in Wiring Systems

G102 (Cat® Diesel)

From the engine harness, to outside left frame rail behind the shock

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G102 (Gasoline)

From the engine harness, to the back of the left cylinder head

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G102 (GM Diesel)

From the engine harness, to the right side of the top front of the engine

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G207 (ABS-Hydraulic)

Near the left kick panel, at the park brake switch mounting screw, on the right side of the park brake lever bracket

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P100

On the right side of the bulkhead

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S105

In the forward lamps harness, approximately 15 cm (5.9 in) to the headlamp, the right high/ low beam breakout

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S109

In the forward lamps harness, approximately 20 cm (7.9 in) to the left front park and turn signal lamp

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S138

In the engine harness, approximately 4 cm (1.6 in) from the generator harness breakout

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S138 (Cat® Diesel)

In the engine harness, approximately 11 cm (4.3 in) from the main harness, toward the forward lamps harness connector

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S138 (GM Diesel)

In the engine harness, approximately 20 cm (7.9 in) toward the forward lamps harness connector from the fuel tank harness

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S142 (Gasoline)

In the engine harness, approximately 4 cm (1.6 in) from the throttle position (TP) sensor, toward the breakout

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S142 (Cat® Diesel)

In the engine harness, approximately 9.5 cm (3.8 in) from the Cat® diesel powertrain control module(PCM) breakout

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S142 (GM Diesel)

In the engine harness, approximately 11 cm (4.3 in) from the power brake booster pump motor breakout, toward the brake fluid switches

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S218

In the IP harness, approximately 17 cm (6.7 in) to the right of the data link connector (DLC) breakout

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S220

In the IP harness, approximately 15 cm (5.9 in) to the right of the data link connector (DLC) breakout

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S221

In the IP harness, approximately 12 cm (4.7 in) to the right of the data link connector (DLC) breakout

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S223

In the IP harness, approximately 7 cm (2.8 in) to the right of the data link connector (DLC) breakout

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S224

In the IP harness, approximately 4 cm (1.6 in) to the right of the data link connector (DLC) breakout

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S227

In the IP harness, approximately 57 cm (22.4 in) from the headlamps dimmer switch breakout

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S230

In the IP harness, approximately 4 cm (1.6 in) to the right of the instrument panel cluster (IPC) connector breakout

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S231

In the IP harness, approximately 66 cm (26.0 in) from the main harness, toward the IP harness connector

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S232

In the IP harness, approximately 59 cm (23.2 in) from the main harness, toward the IP harness connector

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