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

Front Chassis Harness to Electric/Hydraulic Park Brake Components


Object Number: 231707  Size: LF
(1)Park Brake Pump Motor Connector
(2)Park Brake Pressure Solenoid Valve
(3)Park Brake Pressure Sensor
(4)Park Brake Linkage Travel Switch Connector
(5)Electric/Hydraulic Park Brake Actuator
Figure 2:

Instrument Panel Harness to Right Seat


Object Number: 228430  Size: LF
(1)C215 (2 Cavities)
(2)Lower IP Harness
(3)Automatic Transmission Neutral Signal Driver Module (LG5)
(4)Inverting Driver Module Connector
(5)Inverting Driver Module (JE3, JE5)
(6)Multifunction Alarm Module
(7)Park Brake Control Module
(8)Vehicle Speed Sensor (VSS) Buffer
(9)Engine Control Module (ECM) (LG4)
(10)ECM Connector C1 (40 Cavities)
(11)ECM Connector C2 (80 Cavities)
Figure 3:

Front Chassis Harness to Cab Bridge (JE3) Left Forward View


Object Number: 228382  Size: LF
(1)Park Brake Pump Motor Relay
(2)Power Brake Booster Pump Motor Relay
(3)Starter Relay (LG5 and JE3)
(4)Trailer Stop Relay (LG5 and JE3)
(5)Automatic Transmission Modulator Shift Relay (LG5)
Figure 4:

Instrument Panel, Right Side Forward View


Object Number: 228475  Size: MF
(1)Relay Center 1
(2)IP Fuse Block
Figure 5:

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 Switch (JE5)
(6)Trailer Stop lamps Switch (JE5)
(7)Blower Switch - Part of HVAC Control Module
Figure 6:

Park Brake


Object Number: 231691  Size: LF
(1)Park Brake Lever
(2)Park Brake Switch (JE3)