Front Passenger Side Door Key Lock and Unlock Switch Circuit
Front Passenger Side Door Key Lock and Unlock Switch CircuitDESCRIPTION
The front passenger door key lock and unlock switch is built into the front passenger door lock assembly.
When the front passenger door key cylinder is turned to lock all the doors by key, there is continuity between terminals L and E of the key lock and unlock switch. When the cylinder is turned to unlock the door(s), there is continuity between terminals UL and E.
Terminals PKL and PKUL of the body ECU are connected to the door lock assembly and door lock/unlock request signals (by key) are input to the ECU.
The body ECU constantly applies voltage to terminal L of the front passenger door lock assembly via terminal PKL. When the front passenger door key cylinder is turned to lock all the doors by key, current flows from terminal PKL to terminal L. The body ECU determines that this is door lock request signal input.
The body ECU also applies constant voltage to terminal UL of the door lock assembly via terminal PKUL.
When the door key cylinder is turned to unlock the door(s) by key, current flows from terminal PKUL to terminal UL. The body ECU determines that this is door unlock request signal input.
Wiring Diagram:
Step 1:
Step 2:
INSPECTION PROCEDURE