GM Service Manual Online
For 1990-2009 cars only

Lighting Systems Components Headlights: Daytime Running Li

Name

Location

Locator View

Connector End View

Daytime Running Lights (DRL) Diode Module

Under the right side of the IP, approximately 15 cm (6 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

Lighting Systems Connector End Views

Driver Information Center (DIC)

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

Headlamps Dimmer Control

On the left side of the lower part of the steering column

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 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 in Wiring Systems

Ignition Switch

On the top side of the lower steering column

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

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

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 in Wiring Systems

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 in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

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 in Instrument Panel, Gauges and Console

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

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)

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

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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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 (6 in) to the headlamp, the right high/ low beam breakout

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S138

In the engine harness, approximately 4 cm (2 in) from the generator harness breakout

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S138 (Cat® Diesel)

In the engine harness, approximately 11 cm (4 in) from the main harness, toward the forward lamps harness connector

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S142 (Gasoline)

In the engine harness, approximately 4 cm (2 in) from the throttle position (TP) sensor

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S142 (Cat® Diesel)

In the engine harness, approximately 4 cm (2 in)

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S220

In the IP harness, approximately 15 cm (6 in) to the right of the data link connector (DLC) breakout

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S221

In the IP harness, approximately 12 cm (5 in) to the right of the data link connector (DLC) breakout

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Lighting Systems Components Exterior Lights

Name

Location

Locator View

Connector End View

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

Clutch/  Starter Interlock Switch

On the clutch pedal bracket

Engine Electrical Component Views in Engine Electrical

Engine Electrical Connector End Views in Engine Electrical

Clutch/ Starter Interlock Switch Jumper Harness (C215, 2 cavities) (Automatic Transmission)

On the clutch switch jumper, to the IP harness, at the clutch pedal support bracket

Engine Electrical Component Views in Engine Electrical

Engine Electrical Connector End Views in Engine Electrical

Daytime Running Lights (DRL) Control Module

On the left kick panel, in the DRL harness

Lighting Systems Component Views

Lighting Systems Connector End Views

Driver Information Center (DIC)

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

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 in Wiring Systems

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 in Wiring Systems

Multifunction Alarm Module (MFAM)

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

Engine Controls Component Views in Engine Controls

Engine Controls Connector End Views in Engine Controls

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 in Instrument Panel, Gauges and Console

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

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

Engine Controls Connector End Views in Engine Controls-7.4L

Starter Solenoid (Cat® Diesel)

On the lower right side of the engine

Engine Electrical Component Views in Engine Electrical

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C1 (ring terminal)

On the positive battery cable to the starter solenoid Bat stud, at the starter motor

Engine Electrical Component Views in Engine Electrical

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C2 (ring terminal)

In the engine harness, to the starter solenoid Bat stud, at the starter motor

Engine Electrical Component Views in Engine Electrical

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C4 (ring terminal)

In the engine harness, to the starter solenoid Sol stud, at the starter motor

Engine Electrical Component Views in Engine Electrical

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Starter Solenoid (Cat® Diesel and HD Starter w/ Overcrank Protection)

On the lower right side of the engine

Engine Electrical Component Views in Engine Electrical

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C2 (ring terminal)

In the engine harness, to the starter solenoid, at the starter motor

Engine Electrical Component Views in Engine Electrical

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C4 (ring terminal)

In the engine harness, to the starter solenoid, at the starter motor

Engine Electrical Component Views in Engine Electrical

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Starter Solenoid (Gasoline)

On the lower right side of the engine

Engine Electrical Component Views in Engine Electrical

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C1 (ring terminal)

On the positive battery cable to the starter solenoid, at the starter motor

Engine Electrical Component Views in Engine Electrical

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C2 (ring terminal)

In the engine harness, to the starter solenoid, at the starter motor

Engine Electrical Component Views in Engine Electrical

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C4 (ring terminal)

In the engine harness, to the starter solenoid, at the starter motor

Engine Electrical Component Views in Engine Electrical

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C1 (ring terminal)

On the positive battery cable to the starter solenoid, at the starter motor

Engine Electrical Component Views in Engine Electrical

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C2 (ring terminal)

In the engine harness, to the starter solenoid, at the starter motor

Engine Electrical Component Views in Engine Electrical

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C4 (ring terminal)

In the engine harness, to the starter solenoid, at the starter motor

Engine Electrical Component Views in Engine Electrical

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Stoplamp Switch (ABS-Hydraulic)

On the brake pedal support

Lighting Systems Component Views

Lighting Systems Connector End Views

Stoplamp Switch Interface Module (Cat® Diesel)

In the IP, left of the IP fuse block

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

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

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 Connector End 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 Connector End 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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Upfitter Provision for Windshield Washer Motor

In the engine harness, the pink wire, taped to the main harness, approximately 15 cm (6 in) from pass-through P100, at the exterior bulkhead

Power and Grounding Component Views in Wiring Systems

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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

C215 (2 cavities) (Automatic Transmission)

In the IP harness, to the clutch/ starter interlock switch jumper, near the brake pedal

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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

C409 (8 cavities)

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

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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G208

From the IP harness, on the top left side of the steering column

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P100

On the right side of the bulkhead

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S122

In the engine harness, approximately 36 cm (14 in) from the starter solenoid breakout

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S122 (Cat® Diesel)

In the engine harness, approximately 18 cm (7 in) from the G401/G402 breakout

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S142 (Gasoline)

In the engine harness, approximately 4 cm (2 in) from the throttle position (TP) sensor

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S142 (Cat® Diesel)

In the engine harness, approximately 4 cm (2 in)

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S214

In the IP harness, approximately 25 cm (10 in) to the right of the data link connector (DLC) breakout

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S220

In the IP harness, approximately 15 cm (6 in) to the right of the data link connector (DLC) breakout

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S221

In the IP harness, approximately 12 cm (5 in) to the right of the data link connector (DLC) breakout

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S222

In the IP harness, approximately 11 cm (4 in) to the right of the data link connector (DLC) breakout

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S227

In the IP harness, approximately 57 cm (22 in) from the headlamps dimmer switch breakout

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S230

In the IP harness, approximately 4 cm (2 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 in) from the main harness, toward the IP harness connector

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Lighting Systems Components Backup Lights

Name

Location

Locator View

Connector End View

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

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 in Wiring 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 Connector End 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 Connector End Views in Wiring Systems

C200 (56 cavities)

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

C409 (8 cavities)

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

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P100

On the right side of the bulkhead

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Lighting Systems Components Interior Lights: Dimming

Name

Location

Locator View

Connector End View

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 (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) 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

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

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 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 in Wiring Systems

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

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 Connector End 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 Connector End 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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Upfitter Provision for Windshield Washer Motor

In the engine harness, the pink wire, taped to the main harness, approximately 15 cm (6 in) from pass-through P100, at the exterior bulkhead

Power and Grounding Component Views in Wiring Systems

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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

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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P100

On the right side of the bulkhead

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S142 (Gasoline)

In the engine harness, approximately 4 cm (2 in) from the throttle position (TP) sensor

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S142 (Cat® Diesel)

In the engine harness, approximately 4 cm (2 in)

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S220

In the IP harness, approximately 15 cm (6 in) to the right of the data link connector (DLC) breakout

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S221

In the IP harness, approximately 12 cm (5 in) to the right of the data link connector (DLC) breakout

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S223

In the IP harness, approximately 7 cm (3 in) to the right of the data link connector (DLC) breakout

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S231

In the IP harness, approximately 66 cm (26 in) from the main harness, toward the IP harness connector

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