Dtc B2780 Push Switch / Key Unlock Warning Switch Malfunction


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CLEAR DTC

CHECK FOR DTC

INSPECT UNLOCK WARNING SWITCH ASSEMBLY

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

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.

DTC No.
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. Harness or connector
  2. Unlock warning switch assembly
  3. Transponder key ECU assembly
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 No.
Data List and Active Test
B2780
Key SW

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Theft Deterrent Keyless Entry.Entry And Start System (For Entry Function). Dtc B2780 Push Switch / Key Unlock Warning Switch Malfunction


INSPECTION PROCEDURE

NOTICE:
  1. If the transponder key ECU assembly is replaced, refer to the Service Bulletin.
  2. After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".
  3. When using the GTS with the vehicle ignition switch off, connect the GTS to the vehicle and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select the Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Immobiliser. While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.
1.CLEAR DTC

  1. Clear the DTCs (LandCruiser RM000001GV80AJX.html).


NEXT


2.CHECK FOR DTC

  1. Check for DTCs (LandCruiser RM000001GV80AJX.html).

    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 (LandCruiser RM000003YMJ00XX.html)

3.INSPECT UNLOCK WARNING SWITCH ASSEMBLY

  1. Remove the unlock warning switch assembly (LandCruiser RM000002ZQ604SX.html).

  1. Inspect the unlock warning switch assembly (LandCruiser RM000002ZQ4034X.html).



NG
REPLACE UNLOCK WARNING SWITCH ASSEMBLY (LandCruiser RM000002ZQ604SX.html)
OK


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

  1. Disconnect the G3 unlock warning switch assembly connector.

  1. Disconnect the G74 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
    G3-1 - G74-3 (KSW)
    		Always
    		Below 1 Ω
    G3-2 - Body ground
    		Always
    		Below 1 Ω
    G3-1 - Body ground
    		Always
    		10 kΩ or higher
    G74-3 (KSW) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE TRANSPONDER KEY ECU ASSEMBLY