DTC    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 ignition switch is ON. Under normal conditions, the unlock warning switch assembly is on when the ignition switch is ON.

DTC Code
DTC Detection Condition
Trouble Area
DTC Output Confirmation Operation
B2780
The unlock warning switch assembly is not detected as being on when the ignition switch is ON (1 trip detection logic*).
  1. Transponder key ECU assembly
  2. Unlock warning switch assembly
  3. Harness or connector
Insert the key into the ignition key cylinder.
  1. *: Only output while a malfunction is present.

Vehicle Condition and Fail-safe Operation when Malfunction Detected 
Vehicle Condition when Malfunction Detected
Fail-safe Operation when Malfunction Detected
Engine cannot be started
-

Related Data List and Active Test 
DTC Code
Data List and Active Test
B2780
Key SW

WIRING DIAGRAM


B193460E13


INSPECTION PROCEDURE

NOTICE:
  1. When replacing the transponder key ECU assembly, refer to the Registration (Click here).
  2. After performing repairs, perform the operation that fulfills the DTC output confirmation operation, and then confirm that no DTCs are output again.
1.CLEAR DTC

  1. Clear the DTCs (Click here).


NEXT


2.CHECK FOR DTC

  1. Check for DTCs (Click here).

    HINT:
    Before checking for DTCs, perform the "DTC Output Confirmation Operation" procedure.

    OK:
    DTC B2780 is not output.


NG
Go to step 3
OK

USE SIMULATION METHOD TO CHECK (Click here)  

3.INSPECT UNLOCK WARNING SWITCH ASSEMBLY

  1. Inspect the unlock warning switch assembly (Click here).



NG
REPLACE UNLOCK WARNING SWITCH ASSEMBLY (Click here)
OK


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

  1. Disconnect the D111 unlock warning switch assembly connector.

  1. Disconnect the D139 transponder key ECU assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D111-1 - D139-3 (KSW)
    		Always
    		Below 1 Ω
    D111-2 - Body ground
    		Always
    		Below 1 Ω
    D111-1 - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE TRANSPONDER KEY ECU ASSEMBLY (Click here)