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

Wheel Speed Sensor (WSS) - RF


Object Number: 239081  Size: LF
(1)Wheel Speed Sensor (WSS) - RF
Figure 2:

Pressure Modulator Valve (BPMV) - LF and RF


Object Number: 231739  Size: LF
(1)Brake Pressure Modulator Valve (BPMV) - RF
(2)BPMV - LF
Figure 3:

Center and the Right I/P


Object Number: 1430017  Size: LF
(1)Marker Lamp Switch (RQ2 and U86 or RQ2)
(2)High Idle Switch (UF3)
(3)Traction Control Switch (NW9)
(4)Outside Heated Mirror Switch (DB6/DB8)
(5)Exhaust Brake Switch (K40)
(6)Rear Axle Driver Control Switch - Two Speed (HPZ/Automatic Transmission)
(7)Air Suspension Dump Switch (G40/G45/GSJ)
(8)Power Take-Off (PTO) Switch
(9)Driver Information Center (DIC)
Figure 4:

Brake Pressure Modulator Valves (BPMV) -- Rear


Object Number: 690325  Size: MF
(1)Brake Pressure Modulator Valve -- LR
(2)Brake Pressure Modulator Valve -- RR
Figure 5:

Wheel Speed Sensor (WSS) - LF


Object Number: 239939  Size: LF
(1)Wheel Speed Sensor (WSS) - LF
Figure 6:

Wheel Speed Sensor (WSS) - LR and RR


Object Number: 239938  Size: LF
(1)Wheel Speed Sensor (WSS) - LR
(2)WSS - RR