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

Front Chassis Harness to Relay Bracket on Cab Bridge, Left Side View (LG5)


Object Number: 492341  Size: LF
(1)Power Steering Reservoir
(2)Exhaust Brake Relay
(3)Air ABS Relay
(4)Starter Relay
(5)Trailer Stop-ABS Relay
(6)Automatic Transmission Relay
Figure 2:

Front Chassis Harness to Air ABS Control Unit (LG5)


Object Number: 492339  Size: LF
(1)Electronic Brake Control Module-Air ABS
(2)Electronic Brake Control Module Connector C 1 (18 Pin)
(3)Electronic Brake Control Module Connector C 2 (30 Pin)
(4)Power Steering Reservoir
Figure 3:

Front Chassis Harness to Cab Bridge (JE5) (LG4) Right Forward View


Object Number: 397657  Size: LF
(1)ABS Relay (JE5)
(2)Exhaust Brake Disable (Interlock) Relay
(3)Trailer Stop Relay
(4)Electronic Brake Control Module (EBCM) (JE5)
Figure 4:

Front Chassis Harness to Cab Bridge (ABS-Air) LH Forward View (LRO/LSO)


Object Number: 231698  Size: LF
(1)Electronic Brake Control Module (EBCM) (ABS-Air)
(2)Cab Bridge
Figure 5:

Front Chassis Harness to Cab Bridge (JE5) (LG4) Right Forward View


Object Number: 397657  Size: LF
(1)ABS Relay (JE5)
(2)Exhaust Brake Disable (Interlock) Relay
(3)Trailer Stop Relay
(4)Electronic Brake Control Module (EBCM) (JE5)
Figure 6:

Front Chassis Harness to Cab Bridge (ABS-Air) LH Forward View (LRO/LSO)


Object Number: 231700  Size: LF
(1)G104 (ABS-Air)
Figure 7:

Front Chassis Harness to Brake Components


Object Number: 231739  Size: LF
(1)Brake Pressure Modulator Valve (BPMV), Right Side Front
(2)BPMV, Left Side Front
Figure 8:

Front Wheel Speed Sensor (WSS)


Object Number: 231740  Size: LF
(1)Wheel Speed Sensor (WSS) - RF (LF Similar)
Figure 9:

Electronic Brake Controls Harness and Components , LH View


Object Number: 231756  Size: LF
(1)RH Rear Wheel Speed Sensor (WSS) (JE4)
(2)RH Rear Gender Adapter Connector (4 male-to-male cavities) (JE4)
(3)RH Rear Brake Pressure Modulator Valve (BPMV) (JE4)
(4)LH Rear BPMV (JE4)
(5)LH Rear WSS (JE4)
(6)LH Rear Gender Adapter Connector (4 male-to-male cavities) (JE4)
Figure 10:

Rear of Frame, Right Rear View


Object Number: 231761  Size: MF
(1)Wheel Speed Sensor (WSS) -- LR (RF Symilar)