B2780

DTC B2780 PUSH SWITCH/KEY UN-LOCK WARNING SWITCH MALFUNCTION

CIRCUIT DESCRIPTION

DTC Detection Condition:

This DTC is detected when the transponder key ECU does not detect the key un-lock warning switch ON even with the ignition switch ON (In the normal condition, the key un-lock warning switch should be ON when the ignition switch is ON).

NOTE: The key un-lock warning system has a function with a large-scale 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 - 3:

INSPECTION PROCEDURE