Dtc B279A Theft Deterrent System Communication Line High Fixation


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CLEAR DTC

CHECK FOR DTC

CHECK HARNESS AND CONNECTOR (ID CODE BOX - ECM)

CHECK ID CODE BOX (IMMOBILISER CODE ECU) (OUTPUT)

CHECK HARNESS AND CONNECTOR (ID CODE BOX - BATTERY AND BODY GROUND)

REPLACE ECM

REGISTER ECU COMMUNICATION ID

CLEAR DTC

CHECK FOR DTC

DTC B279A Theft Deterrent System Communication Line High Fixation


DESCRIPTION

If the communication line (EFIO-IMI) to the ID code box is stuck on HI output, the ECM stores this DTC.

DTC Code
DTC Detection Condition
Trouble Area
B279A
The communication line (EFIO-IMI) between the ECM and the ID code box (immobiliser code ECU) is stuck on HI output.
  1. Harness or connector
  2. ID code box (immobiliser code ECU)
  3. ECM

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. When replacing the ID code box (immobiliser code ECU) or ECM, refer to the Service Bulletin.
  2. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
1.CLEAR DTC

  1. Clear the DTCs (LandCruiser RM000000QYC07LX.html).


NEXT


2.CHECK FOR DTC

  1. Check for DTCs (LandCruiser RM000000QYC07LX.html).

    HINT:
    If DTCs other than DTC B279A are output, troubleshoot those DTCs first.
    Result
    Result
    		Proceed to
    No DTC is not output
    		A
    DTC B279A and other DTCs are output
    		B
    DTC B279A is output
    		C


B
Go to DIAGNOSTIC TROUBLE CODE CHART (LandCruiser RM000002M6W06FX.html)

C
Go to step 3
A

USE SIMULATION METHOD TO CHECK (LandCruiser RM000003YMJ00XX.html)

3.CHECK HARNESS AND CONNECTOR (ID CODE BOX - ECM)

  1. Disconnect the G37 ID code box (immobiliser code ECU) connector.

  1. Disconnect the G56*1, G58*2, G181*3 or G185*4 ECM connector.

    1. *1: for 1GR-FE
    2. *2: for 1KD-FTV
    3. *3: for 2TR-FE
    4. *4: for 1GD-FTV

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

    Standard Resistance:
    for 1GR-FE (for Automatic Transmission)
    Tester Connection
    		Condition
    		Specified Condition
    G37-6 (EFIO) - G56-10 (IMI)
    		Always
    		Below 1 Ω
    G37-6 (EFIO) or G56-10 (IMI) - Body ground
    		Always
    		10 kΩ or higher
    for 1GR-FE (for Manual Transmission)
    Tester Connection
    		Condition
    		Specified Condition
    G37-6 (EFIO) - G56-14 (IMI)
    		Always
    		Below 1 Ω
    G37-6 (EFIO) or G56-14 (IMI) - Body ground
    		Always
    		10 kΩ or higher
    for 1KD-FTV
    Tester Connection
    		Condition
    		Specified Condition
    G37-6 (EFIO) - G58-28 (IMI)
    		Always
    		Below 1 Ω
    G37-6 (EFIO) or G58-28 (IMI) - Body ground
    		Always
    		10 kΩ or higher
    for 2TR-FE
    Tester Connection
    		Condition
    		Specified Condition
    G37-6 (EFIO) - G181-10 (IMI)
    		Always
    		Below 1 Ω
    G37-6 (EFIO) or G181-10 (IMI) - Body ground
    		Always
    		10 kΩ or higher
    for 1GD-FTV
    Tester Connection
    		Condition
    		Specified Condition
    G37-6 (EFIO) - G185-16 (IMI)
    		Always
    		Below 1 Ω
    G37-6 (EFIO) or G185-16 (IMI) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK ID CODE BOX (IMMOBILISER CODE ECU) (OUTPUT)


  1. Using an oscilloscope, check the waveform.


    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


    Text in Illustration
    *A
    		for 1GR-FE
    		*B
    		for Automatic Transmission
    *C
    		for Manual Transmission
    		*D
    		for 1KD-FTV
    *E
    		for 2TR-FE
    		*F
    		for 1GD-FTV
    *a
    		Component with harness connected
    (ECM)
    		-
    		-
    Measurement Condition
    Item
    		Content
    Tester Connection
    		G56-10 (IMI) - Body ground*1
    G56-14 (IMI) - Body ground*2
    G58-28 (IMI) - Body ground*3
    G181-10 (IMI) - Body ground*4
    G185-16 (IMI) - Body ground*5
    Tool Setting
    		10 V/DIV., 100 ms./DIV.
    Condition
    		Engine switch on (IG)
    1. *1: for 1GR-FE (for Automatic Transmission)
    2. *2: for 1GR-FE (for Manual Transmission)
    3. *3: for 1KD-FTV
    4. *4: for 2TR-FE
    5. *5: for 1GD-FTV
    OK:
    Waveform is output normally (refer to illustration).
    Result
    Result
    		Proceed to
    NG
    		A
    OK (for 1GR-FE)
    		B
    OK (for 1KD-FTV)
    		C
    OK (for 2TR-FE)
    		D
    OK (for 1GD-FTV)
    		E


B
REPLACE ECM (LandCruiser RM00000329203TX.html)

C
REPLACE ECM (LandCruiser RM0000013Z002CX.html)

D
REPLACE ECM (LandCruiser RM000000VW203EX.html)

E
REPLACE ECM (LandCruiser RM0000013Z002DX.html)
A


5.CHECK HARNESS AND CONNECTOR (ID CODE BOX - BATTERY AND BODY GROUND)


    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

  1. Disconnect the G37 ID code box (immobiliser code ECU) connector.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    G37-1 (+B) - Body ground
    		Always
    		11 to 14 V

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    G37-8 (GND) - Body ground
    		Always
    		Below 1 Ω
Text in Illustration
*a
Front view of wire harness connector
(to ID Code Box [Immobiliser Code ECU])


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


6.REPLACE ECM

  1. Temporarily replace the ECM with a new one.

    1. for 1GR-FE (LandCruiser RM00000329203TX.html)
    2. for 1KD-FTV (LandCruiser RM0000013Z002CX.html)
    3. for 2TR-FE (LandCruiser RM000000VW203EX.html)
    4. for 1GD-FTV (LandCruiser RM0000013Z002DX.html)

NEXT


7.REGISTER ECU COMMUNICATION ID

  1. Register the ECU communication ID (Refer to the Service Bulletin).


NEXT


8.CLEAR DTC

  1. Clear the DTCs (LandCruiser RM000000QYC07LX.html).


NEXT


9.CHECK FOR DTC

  1. Check for DTCs (LandCruiser RM000000QYC07LX.html).

    OK:
    DTC B279A is not output.


NG
REPLACE ID CODE BOX (IMMOBILISER CODE ECU)
OK

END (ECM IS DEFECTIVE)