GM Service Manual Online
For 1990-2009 cars
Makes 🢒 Chevrolet 🢒 2004 🢒 C-Series Medium Duty Truck C6/7/8 - Mexico 🢒 Brakes 🢒 Park Brake 🢒 Park Brake System Component Views
Figure 1:

Instrument Panel Harness to IP Mounted Components, Right Front View
Object Number: 689502 Size: MF
(1)Power Brake (P/B) Booster Pump Motor Relay
(2)Park Brake Pump Motor Relay
(3)Trailer Stop Lamp Relay
(4)Transmission Control Relay - MTW/MX4/Ignition Relay -- Engine Controls - L18
(5)ABS Relay Center
(6)Fuse Block 2 -- Underhood
(7)Fuse Block 1 -- Underhood
(8)C123
(9)C121
(10)Windshield Washer Fluid Pump
(11)Windshield Washer Reservoir
Figure 2:

Instrument Panel Harness to Instrument Panel, Right Front View
Object Number: 689889 Size: LF
(1)Ignition Switch
(2)Park Brake Switch (JE3/J71)
(3)Turn Signal/Multifunction Switch C3
(4)Turn Signal/Multifunction Switch C2
(5)Turn Signal/Multifunction Switch C1
(6)Headlamp Dimmer Switch
(7)Turn Signal/Hazard Flasher Module
(8)Park/Neutral (PNP) Switch C3
(9)Park/Neutral (PNP) Switch C2
(10)Park/Neutral (PNP) Switch C1
(11)Accelerator Pedal Position (APP) Sensor
(12)Low Air Pressure Switch
(13)Stop Lamp Switch
Figure 3:

Instrument Panel Harness to Components, Left Side of Cab
Object Number: 689891 Size: MF
(1)Multifunction Alarm Module
(2)Park Brake Control Module (PBCM)
Figure 4:

Lower Left Frame Rail Below the Cab, Top View
Object Number: 690367 Size: MF
(1)Park Brake Pump Motor Connector
(2)Park Brake Pressure Solenoid Valve
(3)Park Brake Pressure Sensor
(4)Park Brake Solenoid Position Switch Connector
(5)Park Brake Actuator