B2780

ENGINE IMMOBILISER: ENGINE IMMOBILISER 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 ignition switch is on (Under the normal conditions, the unlock warning switch is on when the ignition switch is on).





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to the ON position and turn the Techstream main switch on.
(c) Select Key SW in the Data List and read the value displayed on the Techstream.

Immobiliser:





OK:
ON (Key is in ignition key cylinder) appears on the screen
OK -- REPLACE TRANSPONDER KEY ECU ASSEMBLY

NG -- Continue to next step.

2. INSPECT UNLOCK WARNING SWITCH ASSEMBLY




(a) Remove the unlock warning switch.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:





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

3. CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - UNLOCK WARNING SW ASSEMBLY)




(a) Disconnect the T8 ECU and K3 switch connectors.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:





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

4. CHECK HARNESS AND CONNECTOR (UNLOCK WARNING SW ASSEMBLY - BODY GROUND)




(a) Measure the resistance according to the value(s) in the table below.
Standard resistance:





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