GM Service Manual Online
For 1990-2009 cars only

Name

Location

Locator View

Connector End View

Air Brake Dryer

On the left side of the frame in the component box

Air Brake System Component Views in Air Brakes

Air Brake System Connector End Views in Air Brakes

Instrument Panel Cluster (IPC)

On 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

Instrument Panel Cluster (IPC) C1 (15 cavities)

In the upper IP harness to the IPC

--

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

Instrument Panel Cluster (IPC) C2 (9 cavities)

In the upper IP harness to the IPC

--

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

Instrument Panel Cluster (IPC) C3 (17 cavities)

In the upper IP harness to the IPC

--

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

Instrument Panel Cluster (IPC) C4 (7 cavities)

In the upper IP harness to the IPC

--

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

Instrument Panel Cluster (IPC) C5 (13 cavities)

In the upper IP harness to the IPC

--

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

IP Fuse Block

On the right top side of the IP, under the access panel

Power and Grounding Component Views in Wiring Systems

--

Low Air Pressure Switch (ABS-Air)

On the top rear of the primary air reservoir, at the right frame rail

Air Brake System Component Views in Air Brakes

Air Brake System Connector End Views in Air Brakes

Low Engine Coolant Level Indicator Switch (Isuzu Diesel w/ Automatic Engine Shutdown)

On the left cab bridge, on the bottom of the radiator surge tank

Engine Controls Component Views in Engine Controls-7.8L (Isuzu)

Engine Controls Connector End Views in Engine Controls-7.8L (Isuzu)

Moisture Ejector Heater (Air Brakes)

On the bottom if the primary air tank, between the frame rails

Air Brake System Component Views in Air Brakes

Air Brake System Connector End Views in Air Brakes

Multifunction Alarm Module (MFAM) (Air Brakes)

Under the right seat

Instrument Panel, Gages, and Console Component Views in Instrument Panel, Gauges, and Console-Audible Warnings

--

Multifunction Alarm Module (MFAM) (Air) C1 (16 cavities)

In the lower IP harness to the MFAM

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

Audible Warnings Connector End Views in Instrument Panel, Gauges, and Console

C125 (38 cavities) (Isuzu Diesel)

On the front chassis harness to the engine harness at the left rear of the engine

--

Inline Harness Connector End Views in Wiring Systems

C200 (56 cavities) (Isuzu Diesel)

On the lower IP harness, to the front chassis harness, left center of the cab, in the cab interface connector.

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C212 (84 cavities)

On the lower IP harness to the upper IP harness, left center of the IP at the floor

--

Inline Harness Connector End Views in Wiring Systems

C404 (3 cavities)

On the front chassis harness, to the rear chassis and taillamps harness, inside the right frame rail, inboard of the batteries

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C408 (2 cavities) (Long Wheelbase)

On the rear chassis and taillamps harness, to the air brake moisture ejector valve, approximately 15 cm from the ground connectors breakout

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

G105

On the left front of the #1 crossmember

--

--

G107

On the front chassis harness, on the left frame rail, approximately 25 cm (9.9 in) rear of the front shock absorber

--

--

G404

On the rear chassis and taillamps harness, inboard the right frame rail, in the ground block (part of the negative battery cable)

Power and Grounding Component Views in Wiring Systems

--

P100

In the front chassis harness, underhood, center of the bulkhead, in the cab interface connector housing

Harness Routing Views in Wiring Systems

--

Splice Pack 1

On the lower IP harness, below the left side of the IP, to the right of the steering column, row 2, terminals A, B, C, D, E, F, G, H, J and L

--

--

Splice Pack 4

In the lower IP harness, below the left side of the IP, to the right of the steering column, row 3, terminals A, B, C, D, E, F, G, H, J and L

--

--

S103

In the front chassis harness, approximately 7 cm (2.8 in) rear of the main harness breakout

--

--

S107

In the front chassis harness, approximately 10 cm (3.9 in) forward of the MaxiFuse® block breakout

--

--

S109

In the front chassis harness, approximately 4 cm (1.6 in) rear of the engine harness breakout

--

--

S183

In the front chassis harness, approximately 16 cm (6.3 in) from the G107 ground breakout

--

--

S227

In the upper IP harness, under the IP, approximately 6 cm (2.4 in) left of the fuse block breakout

--

--

S243

In the upper IP harness, approximately 13 cm (5.1 in) from the IP connector toward the main harness

--

--

S260

In the upper IP harness, the main harness at the speedometer breakout

--

--

S269

In the upper IP harness, the main harness, approximately 21 cm (8.3 in) from the upper IP connector C212 (84 cavities)

--

--

S279

In the lower IP harnes, below the IP, approximately 5 cm (2.0 in) right of the relay center 1 harness breakout

--

--

S280

In the lower IP harness, in the main harness at the frame harness breakout

--

--

S286

In the lower IP harness, in the main harness at the fuse block harness breakout

--

--

S287

In the lower IP harness, in the main harness, approximately 22 cm (8.7 in) right of the fuse block harness breakout

--

--

S293

In the lower IP harness, in the main harness, under the right seat, approximately 15 cm (5.9 in) from the park brake module breakout

--

--

S295

In the lower IP harness, in the main branch, at the C200 (56 cavities) and C202 (56 cavities) breakout

--

--

S330

In the lower IP harness

--

--

S332

In the lower IP harness

--

--

S346

In the lower IP harness

--

--

S347

In the lower IP harness

--

--

S348

In the lower IP harness

--

--

S363

In the lower IP harness

--

--

S400

In the rear chassis and taillamps harness, approximately 30 cm (11.8 in) from the engine harness connectors

--

--

S400 (Long Wheelbase)

In the rear chassis and taillamps harness, at the main branch, approximately 10 cm (3.9 in) from the ground connectors breakout

--

--

S400 (Low Profile)

In the rear chassis and taillamps harness, at the main branch, approximately 10 cm (3.9 in) from the ground connectors breakout

--

--

S401

In the rear chassis and taillamps harness, approximately 20 cm (7.9 in) from the engine harness connectors

--

--

S401 (Long Wheelbase)

In the rear chassis and taillamps harness, at the main branch, approximately 5 cm (2.0 in) from C410

--

--

S701

In the moisture ejector and air dryer harness, approximately 10 cm (3.9 in) after the air brake dryer breakout

--

--

S702

In the moisture ejector and air dryer harness, approximately 30 cm (11.8 in) after the air brake dryer breakout

--

--