Shift Interlock: Description and Operation
Key InterlockVoltage is provided at all times through fuse 37 to the key interlock switch. When the key is pressed in, voltage is provided to the key interlock solenoid and the interlock control unit. If the A/T gear position switch is not in park, the interlock control unit provides ground to and energizes the key interlock solenoid, which prevents the key from being turned to the lock position and being removed.
Shift Position Interlock
Voltage is provided to the shift lock solenoid when the ignition switch is in RUN or START. When the A/T gear position switch is in park and the transmission control module (TOM) provides voltage to the coil of the shift lock relay, the shift lock solenoid energizes.
The transmission control module (TOM) will not provide voltage to the coil of the shift lock relay unless the brake pedal is applied and the throttle is released.