GM Service Manual Online
For 1990-2009 cars only

Name

Location

Locator View

Connector End View

Battery

On the top of the crossmember or relocated by the upfitter

Power and Grounding Component Views in Wiring Systems

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Battery Negative Cable Extension

From the right frame rail (G414) to the left frame rail (G413)

Power and Grounding Component Views in Wiring Systems

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Battery, Center (Triple Batteries)

On the top of the crossmember, between the left battery and the right battery, or relocated by the upfitter

Power and Grounding Component Views in Wiring Systems

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Battery, Left (Dual Batteries)

On the top of the crossmember, the left battery, or relocated by the upfitter

Power and Grounding Component Views in Wiring Systems

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Battery, Left (Triple Batteries)

On the top of the crossmember, the left battery, or relocated by the upfitter

Power and Grounding Component Views in Wiring Systems

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Battery, Right (Dual Batteries)

On the top of the crossmember, the right battery, or relocated by the upfitter

Power and Grounding Component Views in Wiring Systems

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Battery, Right (Triple Batteries)

On the top of the crossmember, the right battery, or relocated by the upfitter

Power and Grounding Component Views in Wiring Systems

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Body Ground Strap

From the lower left side of the exterior bulkhead (G107) to the outboard side of the left frame rail (G105)

Power and Grounding Component Views in Wiring Systems

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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

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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) (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

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

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C1 (30 cavities)

In the electronic brake control harness, to the EBCM

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Air Antilock Brake System Connector End Views in Air Antilock Brakes

C2 (18 cavities)

In the electronic brake control harness, to the EBCM

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Air Antilock Brake System Connector End Views in Air Antilock Brakes

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 Brakes

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C1 (2 cavities)

In the electronic brake control harness, to the EBCM

Antilock Brake System Component Views in Antilock Brakes

Antilock Brake System Connector End Views in Antilock Brakes

C2 (24 cavities)

In the electronic brake control harness, to the EBCM

Antilock Brake System Component Views in Antilock Brakes

Antilock Brake System Connector End Views in Antilock Brakes

Fusible Link R (gray) (ABS-Hydraulic)

On the positive battery cable end

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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

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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 IP, above the accelerator pedal

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Air Brake System Connector End Views

Low Air Pressure Switch

Under the IP, above the accelerator pedal

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

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 Cat®

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C1 (16 cavities)

In the IP harness, to the MFAM

Engine Controls Component Views in Engine Controls 7.2L Cat®

Engine Controls Connector End Views in Engine Controls 7.2L Cat®

C2 (4 cavities) (with Automatic Engine Shutdown)

In the IP harness to the MFAM

Engine Controls Component Views in Engine Controls 7.2L Cat®

Engine Controls Connector End Views in Engine Controls 7.2L Cat®

Multifunction Alarm Module (MFAM) (Gasoline)

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

Engine Controls Component Views in Engine Controls 6.0L-7.0L

Engine Controls Connector End Views in Engine Controls 6.0L-7.0L

Multifunction Alarm Module (MFAM) (GM Diesel)

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

Engine Controls Component Views in Engine Controls 6.5L-L65

Engine Controls Connector End Views in Engine Controls 6.5L-L65

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 Cat®

Engine Controls Connector End Views in Engine Controls 7.2L Cat®

Positive Battery Cable

From the battery (+) terminal to the starter solenoid

Power and Grounding Component Views in Wiring Systems

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Positive Battery Cable Extension

From the battery (+) terminal to the upfitter IP (+) junction block, under the left side of the IP, on the left kick panel

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Stoplamps Switch (ABS-Air)

On the brake pedal support

Lighting Systems Component Views in Lighting Systems

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C1 (4 cavities)

In the IP harness, to the stoplamps 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 stoplamps switch

Lighting Systems Component Views in Lighting Systems

Lighting Systems Connector End Views in Lighting Systems

Stoplamps Switch (ABS-Hydraulic)

On the brake pedal support

Lighting Systems Component Views in Lighting Systems

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C1 (4 cavities)

In the IP harness, to the stoplamps 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 stoplamps switch

Lighting Systems Component Views in Lighting Systems

Lighting Systems Connector End Views in Lighting Systems

Upfitter Connector (C212, 23 cavities)

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

Power and Grounding Component Views in Wiring Systems

Power and Grounding Component Views in Wiring Systems

Upfitter Connector Jumper (Shunt) (23 cavities)

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

Power and Grounding Component Views in Wiring Systems

Power and Grounding Component Views in Wiring Systems

Upfitter IP (+) Junction Block

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

Power and Grounding Component Views in Wiring Systems

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C119 (7 cavities) (Cat® Diesel)

In the ABS-hydraulic jumper 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

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

C119 (7 cavities) (GM Diesel)

In the ABS-hydraulic jumper 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

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

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

C233 (2 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

C401 (2 cavities) (Cat® Diesel)

On the positive battery cable harness, to the engine harness, near the battery

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Inline Harness Connector End Views in Wiring Systems

C401 (2 cavities) (Gasoline)

Above transmission bell housing

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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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G101 (GM Diesel w/ Left Fuel Tank and Dual Batteries)

From the negative battery cable at the right frame rail

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G102 (Cat® Diesel)

From the engine harness, to the lower left outside of frame rail

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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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G108 (Hydraulic Brakes)

From the engine harness, to the left side of the power brake (P/B) booster pump housing

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P100

On the right side of the bulkhead

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P103

On the left side of the bulkhead

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S140

In the engine harness, approximately 4 cm (1.6 in) toward the knock sensor (KS), from the engine speed governor breakout

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S140 (GM Diesel)

In the engine harness, approximately 9 cm (3.5 in) toward the transmission harness breakout, from the ABS 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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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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S201

In the IP harness, approximately 35 cm (13.8 in) from C200

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S203

In the IP harness, approximately 4 cm (1.6 in) from the IP fuse block breakout

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S206

In the IP harness, approximately 14 cm (5.5 in) to the right of the hazard warning switch breakout

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S207

In the IP harness, approximately 14 cm (5.5 in) to the right of the hazard warning switch breakout

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S209

In the IP harness, approximately 7 cm (2.8 in) to the right of the hazard warning switch 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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S222

In the IP harness, approximately 11 cm (4.3 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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S231

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

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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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S261 (ABS-Hydraulic)

In the ABS-hydraulic jumper harness, approximately 40 cm (15.7 in) from the exterior bulkhead pass-through P103

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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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