Dtc B279A Theft Deterrent System Communication Line High Fixation

Vehicle Interior. Land Cruiser. Urj200, 202 Grj200 Vdj200
Theft Deterrent Keyless Entry. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CLEAR DTC

CHECK FOR DTC

CHECK CONNECTION OF CONNECTOR

CHECK HARNESS AND CONNECTOR (ID CODE BOX [IMMOBILISER CODE ECU] - ECM)

REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

REGISTER RECOGNITION CODES

REGISTER ECU COMMUNICATION ID

CLEAR DTC

CHECK FOR DTC

DTC B279A Theft Deterrent System Communication Line High Fixation


DESCRIPTION

When the communication line (IMI - EFIO) between the ECM and ID code box (immobiliser code ECU) is stuck high, the ECM stores this DTC.

DTC Code
DTC Detection Condition
Trouble Area
B279A
The communication line (IMI - EFIO) between the ECM and ID code box (immobiliser code ECU) is stuck high (1 trip detection logic*).
  1. ID code box (immobiliser code ECU)
  2. ECM
  3. Harness or connector
  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
Engine cannot be started

Related Data List and Active Test
DTC Code
Data List and Active Test
B279A
-

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Theft Deterrent Keyless Entry.Entry And Start System (For Entry Function). Dtc B279A Theft Deterrent System Communication Line High Fixation


INSPECTION PROCEDURE

NOTICE:
  1. When using the GTS with the engine switch off, connect the GTS to the DLC3 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 Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry&Start(CAN). 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.
  2. Before replacing the ECM or ID code box (immobiliser code ECU), refer to Service Bulletin.
  3. After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation."
HINT:
When DTC B279A and the certification ECU (smart key ECU assembly) DTC are output simultaneously, first perform troubleshooting for the certification ECU (smart key ECU assembly) DTC.
1.CLEAR DTC

  1. Clear the DTCs (Click here).


NEXT


2.CHECK FOR DTC

  1. Turn the engine switch on (IG) and wait 10 seconds.

  1. Check for DTCs (Click here).

    Result
    Result
    		Proceed to
    DTC B279A is output
    		A
    DTC B279A and other DTCs are output
    		B
    HINT:
    If DTCs other than DTC B279A are output, troubleshoot those DTCs first.


B
GO TO DIAGNOSTIC TROUBLE CODE CHART (Click here)
A


3.CHECK CONNECTION OF CONNECTOR

  1. Turn the engine switch off.

  1. Check that the connectors are properly connected to the ECM and ID code box (immobiliser code ECU).

    OK:
    Connectors are properly connected.


NG
CONNECT CONNECTORS PROPERLY
OK


4.CHECK HARNESS AND CONNECTOR (ID CODE BOX [IMMOBILISER CODE ECU] - ECM)

  1. Disconnect the E124 ID code box (immobiliser code ECU) connector.

  1. Disconnect the A38*1 or A52*2 ECM connector.

    1. *1: for LHD
    2. *2: for RHD

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

    Standard Resistance:
    for 3UR-FE:
    Tester Connection
    		Condition
    		Specified Condition
    E124-4 (EFIO) - A38-46 (IMI)
    		Always
    		Below 1 Ω
    E124-4 (EFIO) or A38-46 (IMI) - Body ground
    		Always
    		10 kΩ or higher
    for 1UR-FE, 1GR-FE (for LHD):
    Tester Connection
    		Condition
    		Specified Condition
    E124-4 (EFIO) - A38-40 (IMI)
    		Always
    		Below 1 Ω
    E124-4 (EFIO) or A38-40 (IMI) - Body ground
    		Always
    		10 kΩ or higher
    for 1UR-FE, 1GR-FE (for RHD):
    Tester Connection
    		Condition
    		Specified Condition
    E124-4 (EFIO) - A52-40 (IMI)
    		Always
    		Below 1 Ω
    E124-4 (EFIO) or A52-40 (IMI) - Body ground
    		Always
    		10 kΩ or higher
    for 1VD-FTV (for LHD):
    Tester Connection
    		Condition
    		Specified Condition
    E124-4 (EFIO) - A38-11 (IMI)
    		Always
    		Below 1 Ω
    E124-4 (EFIO) or A38-11 (IMI) - Body ground
    		Always
    		10 kΩ or higher
    for 1VD-FTV (for RHD):
    Tester Connection
    		Condition
    		Specified Condition
    E124-4 (EFIO) - A52-11 (IMI)
    		Always
    		Below 1 Ω
    E124-4 (EFIO) or A52-11 (IMI) - Body ground
    		Always
    		10 kΩ or higher

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

    Standard Voltage:
    for 3UR-FE:
    Tester Connection
    		Condition
    		Specified Condition
    A38-46 (IMI) - Body ground
    		Always
    		11 to 14 V
    for 1UR-FE, 1GR-FE (for LHD):
    Tester Connection
    		Condition
    		Specified Condition
    A38-40 (IMI) - Body ground
    		Always
    		11 to 14 V
    for 1UR-FE, 1GR-FE (for RHD):
    Tester Connection
    		Condition
    		Specified Condition
    A52-40 (IMI) - Body ground
    		Always
    		11 to 14 V
    for 1VD-FTV (for LHD):
    Tester Connection
    		Condition
    		Specified Condition
    A38-11 (IMI) - Body ground
    		Always
    		11 to 14 V
    for 1VD-FTV (for RHD):
    Tester Connection
    		Condition
    		Specified Condition
    A52-11 (IMI) - Body ground
    		Always
    		11 to 14 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

  1. Replace the ID code box (immobiliser code ECU) with a new one.

    HINT:
    Refer to Service Bulletin.

NEXT


6.REGISTER RECOGNITION CODES

  1. Register the recognition codes in the ECUs.

    HINT:
    Refer to Service Bulletin.

NEXT


7.REGISTER ECU COMMUNICATION ID

  1. Register the ECU communication ID.

    HINT:
    Refer to Service Bulletin.

NEXT


8.CLEAR DTC

  1. Clear the DTCs (Click here).


NEXT


9.CHECK FOR DTC

  1. Perform "DTC Output Confirmation Operation" procedure.

  1. Check for DTCs (Click here).

    OK:
    DTC B279A is not output.
    Result
    		Proceed to
    OK
    		A
    NG (for 3UR-FE)
    		B
    NG (for 1UR-FE)
    		C
    NG (for 1GR-FE)
    		D
    NG (for 1VD-FTV)
    		E


B
REPLACE ECM (Click here)

C
REPLACE ECM (Click here)

D
REPLACE ECM (Click here)

E
REPLACE ECM (Click here)
A

END (ID CODE BOX [IMMOBILISER CODE ECU] WAS DEFECTIVE)