Circuit Operation

When the Ignition Switch is turned to "RUN," "BULB TEST" or "START," voltage is applied to the Instrument Cluster through CKT 39 from Gages Fuse 9. The "BRAKE" Indicator receives a ground through CKT 33 by any one of three components. the Park Brake Switch, Brake Combo Valve, Electronic Brake Control Module (EBCM) or the Electronic Brake/Traction Control Module (EBTCM).

When the Ignition Switch is turned to "RUN," CKT 33 is grounded through the Electronic Brake Control Module (EBCM) or Electronic Brake/Traction Control Module (EBTCM), illuminating the "BRAKE" Indicator for approximately 3 seconds. When the Park Brake is set, the Park Brake Switch closes, grounding CKT 33 through the Park Brake Switch. For a better understanding of when the Brake Combo Valve, Electronic Brake Control Module (EBCM) or the Electronic Brake/Traction Control Module (EBTCM) will ground CKT 33, refer to Antilock Brake System. Antilock Brakes / Traction Control Systems