Only Wireless Control Function Is Inoperative

CIRCUIT DESCRIPTION
The door control receiver (built in the inner rear view mirror) receives a signal from the transmitter and sends it to the theft warning ECU by line. And the theft warning ECU transmits the signal multiply to each multiplex network door ECU, by which the multiplex network door ECU controls the door lock, the front controller controls the front hazard lights, and the rear J/B controls the rear hazard lights.

NOTE: The multiplex function control system has a function with large-scale multiplex communications. First of all, inspect the communication function depending on the "How To Proceed With Troubleshooting", and check that there is no abnormality in the communication system. Then finally proceed with the troubleshooting. Also, when a short circuit exists in the wire harness between the theft warning ECU and the door control receiver, diagnostic trouble code (DTC) B1242 is output and the wireless function does not operate.

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INSPECTION PROCEDURE