B2780

THEFT DETERRENT / KEYLESS ENTRY: 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 stored if the transponder key ECU assembly does not detect that the unlock warning switch assembly is ON even when the key is in the ignition key cylinder. Under normal conditions, the unlock warning switch assembly is ON when the key is in the ignition key cylinder.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
If the transponder key ECU assembly is replaced, refer to Registration Engine Immobilizer System (w/o Smart Key System).

PROCEDURE

1. READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Immobiliser / Data List.

(e) Read the Data List according to the display on the Techstream.

Immobiliser (Transponder Key ECU Assembly)





OK:

On the Techstream screen, the item changes between ON and OFF according to the chart above.

NG -- INSPECT UNLOCK WARNING SWITCH ASSEMBLY

OK -- REPLACE TRANSPONDER KEY ECU ASSEMBLY Removal

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:





Text in Illustration





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

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

(a) Disconnect the transponder key ECU assembly 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 Removal