GM Service Manual Online
For 1990-2009 cars only
Figure 1:

IP, Center View


Object Number: 230778  Size: LF
(1)Hourmeter
(2)Air Brake Pressure Gauge Lamp
(3)Air Brake Pressure Gage
(4)Ammeter
(5)Multifunction Alarm Module (MFAM) C2 (4 cavities)
(6)Hazard Warning Switch Indicator Lamp (part of the hazard warning lamps name plate)
(7)Right IP Trim Bezel
(8)Hazard Warning Switch
(9)Center IP Trim Bezel
(10)Automatic Transmission (A/T) Selector Control
(11)Left IP Trim Bezel
(12)Low Air Pressure Switch
Figure 2:

Engine Harness, Left Front (LG5)


Object Number: 235946  Size: LF
(1)Engine Speed Governor Control Module
(2)Air Intake Heater Engine Coolant Temperature (ECT) Switch
(3)Engine Coolant Temperature (ECT) Gauge Sensor
Figure 3:

Left Side of IP (Components), Forward


Object Number: 220291  Size: MF
(1)IP Lamps Dimmer Switch
(2)Instrument Cluster
(3)Exhaust Brake Clutch Switch Jumper Plug
(4)Exhaust Brake Clutch Switch
(5)Upfitter Connector (23 cavities)
(6)Upfitter Connector Jumper (23 cavities)
(7)Upfitter IP (+) Junction Block
(8)Daytime Running Lamp (DRL) Control Module
(9)Driver Information Center
(10)Headlamps Switch
Figure 4:

Engine Harness (LP4/L21), Upper Right Front View


Object Number: 235950  Size: LF
(1)Throttle Body Fuel Injector 1
(2)Throttle Body Fuel Injector 2
(3)Engine Speed Governor Motor
(3)Engine Speed Governor Module
(4)Engine Coolant Temperature (ECT) Gauge Sensor
(5)Engine Speed Governor Module
(6)Knock Sensor (KS) Module
(6)Knock Sensor (KS) Module
(7)Exhaust Gas Recirculation (EGR) Electronic Vacuum Regulator Solenoid Valve
(8)Throttle Position (TP) Sensor
(9)Idle Air Control (IAC) Valve
(10)Manifold Absolute Pressure (MAP)
Figure 5:

Engine Harness (LG5), Left Forward


Object Number: 228996  Size: LF
(1)Air Intake Heater Control Module
(2)Air Intake Heater Engine Oil Pressure Indicator Switch
(3)Engine Oil Pressure Gauge Sensor
(4)Low Engine Oil Pressure Indicator Switch
(5)Fuel Shutoff Solenoid Valve
(6)Exhaust Brake Accelerator Switch
Figure 6:

Glowplug Harness (GM Diesel), Upper LH View


Object Number: 230790  Size: LF
(1)Glowplug Relay
(2)Glowplugs
(3)Glowplug 1
(4)Engine Coolant Temperature (ECT) Sensor
Figure 7:

Engine Harness Components (LP4/L21), Upper Left Rear


Object Number: 216233  Size: LF
(1)Distributor Ignition (DI) Control Module C2 (2 cavities)
(2)Distributor Ignition (DI) Control Module C1 (4 cavities)
(3)Distributor
(4)Oxygen (O2) Sensor
(5)Engine Oil Pressure Gauge Sensor and Fuel Pump Switch
(6)Ignition Coil C2 (2 cavities)
(7)Ignition Coil C1 (2 cavities)
Figure 8:

Engine Harness (GM Diesel), Upper RH Front View


Object Number: 230794  Size: LF
(1)Engine Oil Pressure Gauge Sensor and Oil Pressure Switch
Figure 9:

Fuel Tank Harness to Fuel Level Controls (GM Diesel Similar), LH Front View


Object Number: 230787  Size: LF
(1)Fuel Sender
(2)Secondary Fuel Filter
(3)Primary Fuel Filter
Figure 10:

Engine Harness to Generator (LP4/L21), Upper Right Forward


Object Number: 216265  Size: LF
(1)Generator Fuse
(2)Generator C2 (ring terminal)
(3)Generator C3 (2 cavities)
(4)Generator R Terminal
(5)Generator
(6)Generator BATT Terminal
(7)Generator C1 (ring terminal)
Figure 11:

Engine Harness to Radiator Surge Tank, Right Forward View


Object Number: 228302  Size: LF
(1)Low Engine Coolant Level Indicator Switch (LG5)
Figure 12:

IP Harness to Dash Panel, Right Forward


Object Number: 230863  Size: LF
(1)Relay Center
(2)Vehicle Speed Sensor (VSS) Buffer
(3)Fuse Block 2
(4)Fuse Block 1
(5)IP Fuse Block/Mini-Relay Center
(6)Flasher/Relay Center, Position 3
(7)Flasher/Relay Center, Position 2, Exhaust Brake Relay
(8)Flasher/Relay Center
(9)Flasher/Relay Center, Position 1
Figure 13:

Manual Transmission Harness, Left Forward View


Object Number: 228367  Size: LF
(1)Backup Lamps Switch
(2)Vehicle Speed Sensor (VSS) (JE4)
(3)Vehicle Speed Sensor (VSS) (JE3)
Figure 14:

Engine Harness to Radiator, Right Forward View


Object Number: 239919  Size: LF
(1)Automatic Transmission (A/T) Fluid Temperature Gauge Sensor