Dtc B279A Theft Deterrent System Communication Line High Fixation


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CLEAR DTC

CHECK FOR DTC

CHECK CONNECTION OF CONNECTOR

CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - ECM)

REPLACE TRANSPONDER KEY ECU ASSEMBLY

CLEAR DTC

CHECK FOR DTC

DTC B279A Theft Deterrent System Communication Line High Fixation


DESCRIPTION

If the communication line (EFIO-IMI) to the transponder key ECU assembly is stuck high (e.g. shorted to +B), the ECM stores this DTC.

DTC No.
DTC Detection Condition
Trouble Area
DTC Output Confirmation Operation
B279A
Communication line (EFIO-IMI) between the ECM and transponder key ECU assembly is stuck high.
  1. Harness or connector
  2. ECM
  3. Transponder key ECU assembly
Turn the ignition switch to ON and wait 6 seconds.

Vehicle Condition and Fail-safe Operation when Malfunction Detected
Vehicle Condition when Malfunction Detected
Fail-safe Operation when Malfunction Detected
Engine cannot be started (initial ignition occurs and engine cranks, then ignition stops)
Engine cannot be started

Related Data List and Active Test
DTC No.
Data List and Active Test
B279A
-

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 B279A Theft Deterrent System Communication Line High Fixation


INSPECTION PROCEDURE

NOTICE:
  1. If the transponder key ECU assembly or ECM 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. Perform "DTC Output Confirmation Operation" procedure.

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

    OK:
    DTC B279A is not output.
    Result:
    Result
    		Proceed to
    NG
    		A
    OK
    		B


B
USE SIMULATION METHOD TO CHECK (LandCruiser RM000003YMJ00XX.html)
A


3.CHECK CONNECTION OF CONNECTOR

  1. Check that the connectors are properly connected to the ECM and transponder key ECU assembly.

    OK:
    Connectors are properly connected.


NG
CONNECT CONNECTORS PROPERLY
OK


4.CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - ECM)

  1. Disconnect the G74 transponder key ECU assembly connector.

  1. Disconnect the G58*1, G181*2 or G182*3 ECM connector.

  1. *1: for 1KD-FTV
  2. *2: for 2TR-FE
  3. *3: for 5L-E

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

    Standard Resistance:
    for 1KD-FTV
    Tester Connection
    		Condition
    		Specified Condition
    G74-13 (EFIO) - G58-28 (IMI)
    		Always
    		Below 1 Ω
    G74-13 (EFIO) or G58-28 (IMI) - Body ground
    		Always
    		10 kΩ or higher
    for 2TR-FE
    Tester Connection
    		Condition
    		Specified Condition
    G74-13 (EFIO) - G181-10 (IMI)
    		Always
    		Below 1 Ω
    G74-13 (EFIO) or G181-10 (IMI) - Body ground
    		Always
    		10 kΩ or higher
    for 5L-E
    Tester Connection
    		Condition
    		Specified Condition
    G74-13 (EFIO) - G182-19 (IMI)
    		Always
    		Below 1 Ω
    G74-13 (EFIO) or G182-19 (IMI) - Body ground
    		Always
    		10 kΩ or higher

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

    Standard Voltage:
    for 1KD-FTV
    Tester Connection
    		Condition
    		Specified Condition
    G58-28 (IMI) - Body ground
    		Always
    		Below 1 V
    for 2TR-FE
    Tester Connection
    		Condition
    		Specified Condition
    G181-10 (IMI) - Body ground
    		Always
    		Below 1 V
    for 5L-E
    Tester Connection
    		Condition
    		Specified Condition
    G182-19 (IMI) - Body ground
    		Always
    		Below 1 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.REPLACE TRANSPONDER KEY ECU ASSEMBLY

  1. Replace the transponder key ECU assembly with a new one.

    HINT:
    Refer to the Service Bulletin.
    NOTICE:
    Key ID code registration is necessary when replacing the transponder key ECU assembly, refer to the Service Bulletin.

NEXT


6.CLEAR DTC

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


NEXT


7.CHECK FOR DTC

  1. Perform "DTC Output Confirmation Operation" procedure.

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

    OK:
    DTC B279A is not output.
    Result:
    Result
    		Proceed to
    OK
    		A
    NG (for 1KD-FTV)
    		B
    NG (for 2TR-FE)
    		C
    NG (for 5L-E)
    		D


B
REPLACE ECM (LandCruiser RM0000013Z002CX.html)

C
REPLACE ECM (LandCruiser RM000000VW203EX.html)

D
REPLACE ECM (LandCruiser RM000000VW203FX.html)
A

END (TRANSPONDER KEY ECU ASSEMBLY WAS DEFECTIVE)