GM Service Manual Online
For 1990-2009 cars only

Name

Location

Locator View

Connector End View

Brake Fluid Level Switch

On the left side of the brake master cylinder reservoir

Hydraulic Brake Component Views

Hydraulic Brake Connector End Views

Brake Fluid Level Switch

On the left side of the brake master cylinder reservoir

Instrument Panel, Gages, and Console Component Views

Instrument Panel, Gages, and Console Connector End Views

Brake Switch Interface Module

In the center of the IP mounted on the shelf

Engine Controls Component Views

Engine Controls Connector End Views

Data Link Connector (DLC) (Cat® Diesel)

Under the left side of the IP

Data Link Communications Component Viewsin Wiring Systems

Power and Grounding Connector End Views

Data Link Connector (DLC) (Cat® Diesel)

Under the left side of the IP

Engine Controls Component Views in Engine Controls-7.2L (Caterpillar®)

Engine Controls Connector End Views

Data Link Connector (DLC) (Gasoline)

Under the left side of the IP

Data Link Communications Component Viewsin Wiring Systems

Power and Grounding Connector End Views

Data Link Connector (DLC) (Gasoline)

Under the left side of the IP

Engine Controls Component Views

Engine Controls Connector End Views

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

Instrument Panel, Gages, and Console Connector End Views

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

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

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

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

C2 (11 cavities)

In the IP harness, to the DIC

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

Instrument Panel, Gages, and Console Connector End Views

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

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

Electronic Brake Control Module (EBCM) (ABS-Air)

On a bracket, on the left side, upper exterior bulkhead, on the top of the air brake application valve

Air Antilock Brake System Component Views in Air Antilock Brake Systems

Air Antilock Brake System Connector End Views

C1 (30 cavities)

In the electronic brake control harness, to the EBCM

Air Antilock Brake System Component Views in Air Antilock Brake Systems

Air Antilock Brake System Connector End Views

C2 (18 cavities)

In the electronic brake control harness, to the EBCM

Air Antilock Brake System Component Views in Air Antilock Brake Systems

Air Antilock Brake System Connector End Views

Electronic Brake Control Module (EBCM) (ABS-Hydraulic)

On the inboard side of the left frame rail, to the rear of number one crossmember, on the bracket

Antilock Brake System Component Views in Antilock Brake Systems

Antilock Brake System Connector End Views

C1 (2 cavities)

In the electronic brake control harness, to the EBCM

Antilock Brake System Component Views in Antilock Brake Systems

Antilock Brake System Connector End Views

C2 (24 cavities)

In the electronic brake control harness, to the EBCM

Antilock Brake System Component Views in Antilock Brake Systems

Antilock Brake System Connector End Views

Electronic Throttle Actuator Control Module

In the center of the IP mounted on the shelf

Engine Controls Component Views

Engine Controls Connector End Views

Electronic Throttle Actuator Control Module - C1

In the center of the IP mounted on the shelf

Engine Controls Component Views

Engine Controls Connector End Views

Electronic Throttle Actuator Control Module - C2

In the center of the IP mounted on the shelf

Engine Controls Component Views

Engine Controls Connector End Views

IP Fuse Block

In the center of the IP, to the left of the instrument panel cluster (IPC)

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views

Ignition Switch

On the top side of the lower steering column

Power and Grounding Component Views

Power and Grounding Connector End Views

C1 (5 cavities)

In the IP harness, to the ignition switch

Power and Grounding Component Views

Power and Grounding Connector End Views

C2 (4 cavities)

In the IP harness, to the ignition switch

Power and Grounding Component Views

Power and Grounding Connector End Views

MaxiFuse® Block/ Mini-Relay Center

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

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views

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 in Wiring Systems

Power and Grounding Connector End Views

Multifunction Alarm Module (MFAM) (Cat® Diesel)

In the center of the IP harness, behind the right access panel

Engine Controls Component Views in Engine Controls 7.2L (Caterpillar®)

Engine Controls Connector End Views

C1 (16 cavities)

In the IP harness, to the MFAM

Engine Controls Component Views in Engine Controls 7.2L (Caterpillar®)

Engine Controls Connector End Views

C2 (4 cavities) (with Automatic Engine Shutdown)

In the IP harness to the MFAM

Engine Controls Component Views in Engine Controls 7.2L (Caterpillar®)

Engine Controls Connector End Views

Multifunction Alarm Module (MFAM) (Gasoline)

In the center of the IP, behind the right access panel

Engine Controls Component Views

Engine Controls Connector End Views

Multifunction Alarm Module (MFAM) Jumper (Shunt) (Cat® Diesel w/ out Automatic Engine Shutdown)

In the IP harness, taped to the main harness, between the IP fuse block and MFAM breakouts.

Engine Controls Component Views in Engine Controls 7.2L (Caterpillar®)

Engine Controls Connector End Views

Powertrain Control Module (PCM) (Cat® Diesel)

On the left rear side of the engine block

Engine Controls Component Views in Engine Controls-7.2L (Caterpillar®)

Engine Controls Connector End Views in Engine Controls-7.2L (Caterpillar®)

Powertrain Control Module (PCM) (Gasoline)

Under the left front cowel in front of driver

Engine Controls Component Views in Engine Controls-7.4L

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Powertrain Control Module (PCM) - C1 (Gasoline) (32 cavities)

Under the left front cowel in front of driver

Engine Controls Component Views in Engine controls-7.4L

Engine Controls Connector End Views in Engine Controls-7.4L

Powertrain Control Module (PCM) - C2 (Gasoline) (24 cavities)

Under the left front cowel in front of driver

Engine Controls Component Views in Engine Controls-7.4L

Engine Controls Connector End Views in Engine Controls-7.4L

Stoplamps Switch (ABS-Air)

On the brake pedal support

Lighting Systems Component Views in Lighting Systems

Lighting Systems Connector End Views in Lighting Systems

C1 (4 cavities)

In the IP harness, to the stoplamp switch

Lighting Systems Component Views in Lighting Systems

Lighting Systems Connector End Views in Lighting Systems

C2 (2 cavities)

In the IP harness, to the stoplamp switch

Lighting Systems Component Views in Lighting Systems

Lighting Systems Connector End Views in Lighting Systems

Stoplamp Switch (ABS-Hydraulic)

On the brake pedal support

Lighting Systems Component Views in Lighting Systems

Lighting Systems Connector End Views in Lighting Systems

C1 (4 cavities)

In the IP harness, to the stoplamp switch

Lighting Systems Component Views in Lighting Systems

Lighting Systems Connector End Views in Lighting Systems

C2 (2 cavities)

In the IP harness, to the stoplamp switch

Lighting Systems Component Views in Lighting Systems

Lighting Systems Connector End Views in Lighting Systems

Wheel Speed Sensor (WSS), Left Front (ABS-Hydraulic)

Mounted in the left front brake backing plate

Antilock Brake System Component Views in Antilock Brake Systems

Antilock Brake System Connector End Views in Antilock Brake Systems

Wheel Speed Sensor (WSS), Left Rear (ABS-Air)

Mounted in the left rear brake backing plate

Air Antilock Brake System Component Views in Air Antilock Brake Systems

Air Antilock Brake System Connector End Views in Air Antilock Brake Systems

Wheel Speed Sensor (WSS), Left Rear (ABS-Hydraulic)

Mounted in the left rear brake backing plate

Antilock Brake System Component Views in Antilock Brake Systems

Antilock Brake System Connector End Views in Antilock Brake Systems

Wheel Speed Sensor (WSS), Right Front (ABS-Air)

Mounted in the right front brake backing plate

Air Antilock Brake System Component Views in Air Antilock Brake Systems

Air Antilock Brake System Connector End Views in Air Antilock Brake Systems

Wheel Speed Sensor (WSS), Right Front (ABS-Hydraulic)

Mounted in the right front brake backing plate

Antilock Brake System Component Views

Antilock Brake System Connector End Views

Wheel Speed Sensor (WSS), Right Rear (ABS-Air)

Mounted in the right rear brake backing plate

Air Antilock Brake System Component Views

Air Antilock Brake System Connector End Views

Wheel Speed Sensor (WSS), Right Rear (ABS-Hydraulic)

Mounted in the right rear brake backing plate

Antilock Brake System Component Views i

Antilock Brake System Connector End Views

C119 (7 cavities) (Gasoline)

In the engine harness, to the ABS-hydraulic chassis harness, in the engine compartment, on the left side of the bulkhead

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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

C210

In the right center of the dash, behind IP fuse block

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Inline Harness Connector End Views in Wiring Systems

C218 (10 cavities) (Cat® Diesel)

In the IP harness, to the engine harness, near the right side of the interior bulkhead

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Inline Harness Connector End Views in Wiring Systems

C232 (3 cavities) (ABS-Hydraulic)

In the IP harness, inline to the ABS-hydraulic brake harness, near the left side of the interior bulkhead

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Inline Harness Connector End Views in Wiring Systems

C234 (7 cavities) (ABS-Hydraulic)

In the IP harness, inline to the ABS-hydraulic brake harness, near the left side of the interior bulkhead

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Inline Harness Connector End Views in Wiring Systems

D201 (ABS Diode) (ABS-Hydraulic)

In the IP harness, approximately 4 cm (1.6 in) from the MaxiFuse® block/ mini-relay center

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G101 (Cat® Diesel)

From the starter motor end ground stud (G101) to the right frame rail ground (G100)

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G102 (Cat® Diesel)

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

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G102 (Gasoline)

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

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G117 (Cat® Diesel)

The engine harness ground and generator ground strap, at the right side of the engine (G117) to the generator (G119)

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G117 (Gasoline)

The generator ground strap, from the right side of the engine (G117) to the generator (G119)

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G412

From the ABS-air chassis harness to the electronic brake control module (EBCM) bracket

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P100

On the right side of the bulkhead

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P102

On the right side of the bulkhead

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P103

On the left side of the bulkhead

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S141

In the engine harness, approximately 17 cm (6.7 in) throttle position (TP), from generator harness breakout

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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 4 cm (1.6 in)

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S213

In the IP harness, approximately 9 cm (3.5 in) to the left of the hazard warning switch breakout

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S214

In the IP harness, approximately 25 cm (9.8 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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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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S232

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

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S234

In the IP harness, approximately 4 cm (1.6 in) to the right of the daytime running lights (DRL) module breakout

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S235 (ABS-Hydraulic)

In the IP harness, at the cathode (-) end of the ABS diode (D201), approximately 4 cm (1.6 in) from the MaxiFuse® block/ mini-relay center, toward the bulkhead

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S236 (ABS-Hydraulic)

In the IP harness, at the anode (+) end of the ABS diode (D201), approximately 4 cm (1.6 in) from the MaxiFuse® block/ mini-relay center, toward the bulkhead

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S249 (Cat® Diesel)

In the IP harness, approximately 20 cm (7.9 in) to the left of the multifunction alarm module (MFAM) breakout

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S262 (ABS-Hydraulic)

In the ABS-hydraulic jumper harness, approximately 46 cm (18.1 in) from the exterior bulkhead pass-through P103

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