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





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM
(a) Connect Techstream to the DLC3.
(b) Turn the ignition switch ON.
(c) Turn the tester on.
(d) Enter the following menus: Body Electrical / Immobiliser / Data List.
(e) Read the Data List according to the display on the tester.

Immobiliser:





OK:
"ON" (Key is in ignition key cylinder) appears on the screen.

NG -- INSPECT UN-LOCK WARNING SWITCH ASSEMBLY
OK -- REPLACE TRANSPONDER KEY ECU ASSEMBLY
2. INSPECT UN-LOCK WARNING SWITCH ASSEMBLY





(a) Remove the un-lock warning switch assembly.
(b) Measure the resistance according to the value(s) in the table below.
Resistance:






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

3. CHECK HARNESS AND CONNECTOR (UN-LOCK WARNING SWITCH ASSEMBLY - BODY GROUND)





(a) Disconnect the D31 switch connector.
(b) Measure the resistance according to the value(s) in the table below.
Resistance:






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

4. CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - UN-LOCK WARNING SWITCH)





(a) Disconnect the D33 ECU and D31 switch connectors.
(b) Measure the resistance according to the value(s) in the table below.
Resistance:






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