B2780

THEFT DETERRENT / KEYLESS ENTRY: ENGINE IMMOBILISER SYSTEM: B2780: Push Switch / Key Unlock Warning Switch Malfunction
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 normal conditions, the unlock warning switch is ON when the ignition switch is ON.





WIRING DIAGRAM





INSPECTION PROCEDURE

HINT
When the transponder key ECU is replaced, reregister the ECU - ECM communication ID Engine Immobiliser System.

PROCEDURE

1. READ VALUE USING TECHSTREAM (UNLOCK WARNING SWITCH)

(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) Use the Data List to check if the unlock warning switch is functioning properly.

Immobiliser





OK:

ON (key is in ignition key cylinder) appears on the screen.

NG -- INSPECT UNLOCK WARNING SWITCH

OK -- REPLACE TRANSPONDER KEY ECU Removal

2. INSPECT UNLOCK WARNING SWITCH





(a) Remove the unlock warning switch Removal.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





(c) Reinstall the unlock warning switch.

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

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





(a) Disconnect the H21 switch connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





(c) Reconnect the switch connector.

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

4. CHECK HARNESS AND CONNECTOR (UNLOCK WARNING SWITCH - TRANSPONDER KEY ECU)





(a) Disconnect the H21 switch connector.

(b) Disconnect the H32 ECU connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





(d) Reconnect the switch connector.

(e) Reconnect the ECU connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE TRANSPONDER KEY ECU Removal