B2780

ENGINE IMMOBILISER: ENGINE IMMOBILISER SYSTEM (w/o Smart Key System): B2780: Push Switch / Key Unlock Warning Switch Malfunction
B2780 - Push Switch / Key Unlock Warning Switch Malfunction

DESCRIPTION

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





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM (UNLOCK WARNING SWITCH)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch ON with a key that cannot start the engine.

(c) On the Techstream, enter the following menus: Body Electrical / Immobiliser / Data List / Key SW. Read the result.

Immobiliser:





OK:

ON (key is in ignition key cylinder) appears on the screen.

NG -- INSPECT UNLOCK WARNING SWITCH ASSEMBLY

OK -- REPLACE TRANSPONDER KEY ECU Removal

2. INSPECT UNLOCK WARNING SWITCH ASSEMBLY





(a) Remove the unlock warning switch.

(b) Measure the resistance of the switch.

Standard Resistance:





NG -- REPLACE UNLOCK WARNING SWITCH ASSEMBLY
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (UNLOCK WARNING SWITCH - BODY GROUND)





(a) Disconnect the E6 switch connector.

(b) Measure the resistance of the wire harness side connector.

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

4. CHECK HARNESS AND CONNECTOR (UNLOCK WARNING SWITCH - TRANSPONDER KEY ECU)





(a) Disconnect the E6 switch connector.

(b) Disconnect the E46 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 Removal