Test F: Key Operated Switch Circuit (Lock Side)
The key operated switch is built into the door key cylinder. When the key is turned to the lock side, the lock terminal of the switch is grounded, and when the key is turned to the unlock side the unlock terminal is grounded. Furthermore, the key operated switch circuit has terminal +B connected inside the theft deterrent ECU, when nether the lock or unlock terminal of the key operated switch are grounded, battery voltage is applied to the key operated switch circuit of the wireless door lock ECU.
NOTE:
For RKE trouble shooting, see Figure.