B2780

ENGINE IMMOBILIZER: ENGINE IMMOBILIZER SYSTEM: B2780: Push Switch / Key Unlock Warning Switch Malfunction

DTC B2780 - Push Switch / Key Unlock Warning Switch Malfunction

DESCRIPTION

This DTC will be output if the transponder key ECU does not detect that the unlock warning switch is ON even when the key is inserted into the ignition key cylinder. Under normal conditions, the unlock warning switch is ON when the key is inserted into the ignition key cylinder.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM (UNLOCK WARNING SWITCH)
(a) Check the Date List for proper functioning of the unlock warning switch.

Immobilizer:





OK:
ON (key is in ignition key cylinder) appears on the screen.
OK -- REPLACE TRANSPONDER KEY ECU
NG -- Continue to next step.
2. INSPECT UNLOCK WARNING SWITCH ASSEMBLY




(a) Remove the switch.
(b) Measure the resistance of the switch.
Standard resistance:






NG -- REPLACE UNLOCK WARNING SWITCH ASSEMBLY
OK -- Continue to next step.
3. CHECK WIRE HARNESS (UNLOCK WARNING SWITCH - TRANSPONDER KEY ECU)




(a) Disconnect the U1 switch connector.
(b) Disconnect the T13 ECU connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE TRANSPONDER KEY ECU