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

IP, Center View


Object Number: 740177  Size: LF
(1)Engine Hour Meter
(2)Air Brake Pressure Gage Lamp
(3)Air Brake Pressure Gage
(4)Ammeter - w/Ammeter Lamp
(5)C236 (LG5 w/o KPJ)
(6)Hazard Indicator Lamp - part of the HAZARD Name Plate
(7)Right IP Trim Bezel
(8)Hazard 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) Gage 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
(6)Upfitter Connector Jumper
(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) Gage 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 Gage Sensor
(4)Low Engine Oil Pressure Indicator Switch
(5)Fuel Shutoff Solenoid Valve
(6)Exhaust Brake Accelerator Switch
Figure 6:

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


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

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


Object Number: 216265  Size: LF
(1)Generator Fuse
(2)Generator C2
(3)Generator C3
(4)Generator R Terminal
(5)Generator
(6)Generator BATT Terminal
(7)Generator C1
Figure 8:

Radiator Surge Tank, Right Forward View (LG5 Shown, L18 Similar)


Object Number: 228302  Size: LF
(1)Coolant Level Switch
Figure 9:

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)Relay Block 3
(7)Relay Block 2
(8)Flasher/Relay Center
(9)Relay Block 1
Figure 10:

Manual Transmission Harness, Left Forward View


Object Number: 228367  Size: LF
(1)Backup Lamp Switch
(2)Vehicle Speed Sensor (VSS) (JE4)
(3)Vehicle Speed Sensor (VSS) (JE3)
Figure 11:

Engine Harness to Radiator, Right Forward View


Object Number: 239919  Size: LF
(1)Transmission Fluid Temperature (TFT) Sensor