B2780

ENGINE IMMOBILISER: ENGINE IMMOBILISER SYSTEM (w/o Smart Key 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 unlock warning switch is on even when the ignition switch is in the ON position. Under normal conditions, the unlock warning switch is on when the ignition switch is in the ON position.






WIRING DIAGRAM





INSPECTION PROCEDURE
NOTE: If the transponder key ECU is replaced, register the key and ECU communication ID Engine Immobiliser System (W/O Smart Key System).

PROCEDURE

1. READ VALUE ON TECHSTREAM (UNLOCK WARNING SWITCH)
(a) Connect Techstream to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) Turn the tester on.
(d) Select the following menu items: Body Electrical / Immobiliser / Data List.
(e) Select Key SW in the Data List and read the tester display.

Immobiliser (Transponder Key ECU):





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




(a) Remove the unlock warning switch assembly Removal.
(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) 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 transponder key ECU connector.
(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