Door Courtesy Switch Assy (For Front Door) Circuit

CIRCUIT DESCRIPTION

Driver's side courtesy light switch signals are transmitted multiply to the theft deterrent ECU from the door ECU. When the ignition switch lock cylinder. Then, once the driver's door is opened, the theft deterrent ECU commands the meter ECU multiply to sound the buzzer and the buzzer inside the meter ECU sounds.

NOTE: Key unlock warning system has a function with a large-scale body multiplex communication. First of all, inspect the communication function according to "how to proceed with troubleshooting", and check that no malfunction exists in the communication system. Then proceed with the troubleshooting.

Wiring Diagram:

Step 1:

Step 2 - 4:

Step 5:

INSPECTION PROCEDURE