B2780

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 assembly does not detect that the un-lock warning switch is ON even when the ignition switch is ON. Under normal conditions, the unlock warning switch assembly is ON when the ignition switch is ON.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE OF TECHSTREAM
(a) Connect Techstream to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) Read the Data List according to the display on the tester.





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 un-lock warning switch assembly.
(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 (UNLOCK WARNING SWITCH - BODY GROUND)





(a) Disconnect the U1 switch connector.
(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 (TRANSPONDER KEY ECU - UNLOCK WARNING SWITCH)





(a) Disconnect the T10 ECU and U1 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 -- REPLACE TRANSPONDER KEY ECU ASSEMBLY