Circuit Operation - Brake Transaxle Shift Interlock

With the transmission shift lever in the PARK position and the brake pedal at rest voltage is supplied from the GAGES Fuse through the PNK/BLK (39) wire to the antilock brake switch, from the switch through the PPL (420) wire to the brake/transmission shift interlock relay contacts, also from the TURN B/U Fuse through the DK BLU (75) wire to the PPL (1627) wire to the brake/transmission shift interlock relay coil, voltage to the brake/transmission shift interlock solenoid is through the DK GRN/WHT (1135) wire. The shift interlock solenoid can be overridden manually by setting the parking brake, placing the ignition switch in the OFF position and moving the selector lever to neutral. The vehicle can then be started. Relay coil ground is through the BLK (150) wire at the instrument panel ground.

When the brake pedal is depressed the TCC/Brake switch contacts open interrupting the voltage supply to the brake/transmission shift interlock relay, the brake transmission shift interlock solenoid de-energizes allowing the transmission selector lever to be moved from the PARK position. When the transmission selector lever is not in the PARK position and the brake pedal is not at rest voltage supply to the relay is interrupted and the brake/transmission shift interlock solenoid coil de-energizes allowing the selector lever to be moved normally between reverse and forward gear ranges.