B2780

DTC B2780 PUSH SWITCH/KEY UNLOCK WARNING SWITCH MALFUNCTION

CIRCUIT DESCRIPTION

DTC Detecting Condition:

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

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 - 3:

INSPECTION PROCEDURE