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

Instrument Panel Harness to Right Seat


Object Number: 228786  Size: MF
(1)Lower IP Harness
(2)Inverting Driver Module Connector (JE3)
(3)Inverting Driver Module (JE3)
(4)Multifunction Alarm Module
(5)Ignition Main Relay
(6)Speedo Adapter (Vehicle Speed Sensor (VSS) Buffer)
(7)Pre Stroke Power Cut Relay Fusible Link, 30 A
(8)Engine Control Module
(9)Engine Control Module Connector C2 (80 cavities)
(10)Engine Control Module Connector C1 (40 cavities)
Figure 2:

Rear Chassis Harness and Tail Lamps, Upper Left Rear View (Typical)


Object Number: 231737  Size: LF
(1)Right Stop, Turn and Tail lamp with Backup Lamp
(2)Left Stop, Turn and Tail lamp with Backup Lamp
Figure 3:

Automatic Transmission , Left Side View


Object Number: 397655  Size: MF
(1)Backup Lamps Switch
(2)Automatic Transmission Modulator
Figure 4:

Manual Transmission Harness (5 or 6-Speed), Upper Left Rear View


Object Number: 628296  Size: LF
(1)Front Chassis Harness
(2)Backup Lamps Switch
(3)Vehicle Speed Sensor (VSS) (JE5)
(4)Vehicle Speed Sensor (VSS) (JE3)
(5)Manual Transmission Case
(6)Manual Transmission Harness
(7)C409
Figure 5:

Manual Transmission Harness (9 or 10-Speed) , Upper Left Rear View


Object Number: 231666  Size: LF
(1)Backup Lamps Switch
(2)Vehicle Speed Sensor (VSS)
Figure 6:

Instrument Panel, Left Forward View


Object Number: 231675  Size: LF
(1)HVAC Controller
(2)Radio
(3)Cigar Lighter Lamp
(4)Cigar Lighter
(5)Park Brake Control (JE4)
(6)Trailer Brake Control (JE4)
(7)Blower Switch - Part of HVAC Controller
Figure 7:

Roof-Top Lamps (Front View)


Object Number: 231439  Size: LF
(1)Left and Right Clearance Lamps and ID Lamps
Figure 8:

Instrument Panel, Right Side Forward View


Object Number: 228475  Size: MF
(1)Relay Center 1
(2)IP Fuse Block
Figure 9:

Instrument Panel Switches, Center Forward View


Object Number: 231678  Size: LF
(1)Exhaust Brake Switch
(2)Fast Idle Switch
(3)Heated Mirror Switch
(4)Two-Speed Rear Axle Shift Switch (Automatic Transmission)
(5)Air Suspension Dump Switch
(6)Differential Lock Switch
(7)Clearance Lamps Switch
Figure 10:

Interior Roof, Right Upper View


Object Number: 231693  Size: LF
(1)Dome and Reading Lamp
(2)Dome and Reading Lamp Switch
Figure 11:

Door Jamb, Left Rear View


Object Number: 231695  Size: LF
(1)Left Door Jamb Switch
Figure 12:

Forward Lamps, Right Front View


Object Number: 231423  Size: LF
(1)Right High/Low Beam Headlamp (Left Similar)
(2)Right High Beam Headlamp (Left Similar)
(3)Right Front Side Marker Lamp (Left Similar)
Figure 13:

Steering Column, Left


Object Number: 228426  Size: LF
(1)Multifunction Switch
(2)Right Multifunction Lever
(3)Ignition Switch
(4)Left Multifunction Lever
Figure 14:

Mirror (Right)


Object Number: 231453  Size: LF
(1)Right Lighted Mirror (Heated Mirror similar)
Figure 15:

Park Brake


Object Number: 231691  Size: LF
(1)Park Brake Lever
(2)Park Brake Switch (Hydraulic Brakes)
Figure 16:

Turn Signal Harness, Left Front View


Object Number: 628188  Size: LF
(1)C107 (4 Cavities)
(2)Front Chassis Harness
(3)C105 (5 Cavities)
(4)Turn Signal Harness
(5)High A Note - Horn
(6)Park and Turn Signal Lamp - LF
(7)Park and Turn Signal Lamp Connector
Figure 17:

Instrument Panel, Center (Typical)


Object Number: 231681  Size: LF
(1)Relay Block 2
Figure 18:

Air Brake Application Valve


Object Number: 231533  Size: LF
(1)Stoplamps Switch (ABS-Air)
(2)Air Brake Application Valve
Figure 19:

Trailer Front Harness to Cab Bridge, Left Forward View


Object Number: 231704  Size: LF
(1)Trailer Receptacle