Shift Interlock: Description and Operation
Key InterlockWhen the Ignition Key is inserted into the Ignition Switch, a ground signal is provided to the Driver's MICU. The Driver's MICU detects the insertion of the Ignition Key through this input. If the shift lever is out of PARK, a ground signal is provided to the Driver's MICU. The Driver's MICU detects that the shift lever is out of PARK through this input. The Driver's MICU provides ground to the Key Interlock Solenoid. The Key Interlock Solenoid is then energized, which prevents the Ignition Switch from being turned to LOCK (0).
Shift Position Interlock
Battery voltage is supplied at all times through Fuse 10 (in the under-hood fuse/relay box) to the Brake Pedal Position Switch. With the Ignition Switch in ON (II) or START (III), battery voltage is supplied through Fuse 5 (in the driver's under-dash fuse/relay box) to the Shift Lock Solenoid. When the brake pedal is pressed, a battery voltage input is supplied to the ECM/PCM and the Driver's MICU. If, at the same time, the accelerator pedal is not pressed, the ECM/PCM provides ground to the Shift Lock Solenoid. The Shift Lock Solenoid is then energized, allowing the shift lever to be moved from the PARK position.
While the vehicle is in forward motion, the ECM/PCM removes ground from the Shift Lock Solenoid. The Shift Lock Solenoid is then de-energized, which disables the shift lever from being moved to REVERSE or PARK.