Airbag System Diagnosis Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK CAN COMMUNICATION SYSTEM

CHECK HARNESS AND CONNECTOR (DLC3 - ECM)

CHECK HARNESS AND CONNECTOR (DLC3 - BODY GROUND)

CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)

AIRBAG SYSTEM - Diagnosis Circuit


DESCRIPTION

DTC output mode is set by connecting terminals TC and CG of the DLC3.
DTCs are output by the blinking of the SRS warning light.
HINT:
  1. When each warning light continues blinking, a ground short in the wiring of terminal TC of the DLC3 or an internal ground short in each ECU is suspected.
  2. A DTC output mode signal is transmitted through the CAN communication system to each ECU including the center airbag sensor. Thus, when all systems do not enter DTC output mode, there may be an ECM malfunction.

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Supplemental Restraint Systems.Airbag System.Airbag System Diagnosis Circuit


INSPECTION PROCEDURE

NOTICE:
  1. After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work (LandCruiser RM000003YMD00TX.html).
  2. When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected (LandCruiser RM000003YMF011X.html).
1.CHECK CAN COMMUNICATION SYSTEM

  1. Check if a CAN communication system DTC is output.

    Result
    Result
    		Proceed to
    DTCs are output (for LHD with Entry and Start System)
    		A
    DTCs are output (for LHD without Entry and Start System)
    		B
    DTCs are output (for RHD with Entry and Start System)
    		C
    DTCs are output (for RHD without Entry and Start System)
    		D
    DTC is not output
    		E


A
REPAIR CIRCUITS INDICATED BY OUTPUT DTCS (LandCruiser RM000001RSO0C5X.html)

B
REPAIR CIRCUITS INDICATED BY OUTPUT DTCS (LandCruiser RM000001RSO0BYX.html)

C
REPAIR CIRCUITS INDICATED BY OUTPUT DTCS (LandCruiser RM000001RSO0BZX.html)

D
REPAIR CIRCUITS INDICATED BY OUTPUT DTCS (LandCruiser RM000001RSO0C0X.html)
E


2.CHECK HARNESS AND CONNECTOR (DLC3 - ECM)
  1. *1: for 1GR-FE
  2. *2: for 2TR-FE
  3. *3: for 1KD-FTV
  4. *4: for 5L-E
  5. *5: for 1GD-FTV
  6. *6: for Automatic Transmission
  7. *7: for Manual Transmission


  1. Turn the ignition switch off.


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Supplemental Restraint Systems.Airbag System.Airbag System Diagnosis Circuit

  1. Disconnect the connector from the ECM.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    G48-13 (TC) - G55-6 (TC)*1, *6
    		Always
    		Below 1 Ω
    G48-13 (TC) - G56-28 (TC)*1, *7
    		Always
    		Below 1 Ω
    G48-13 (TC) - G180-19 (TC)*2
    		Always
    		Below 1 Ω
    G48-13 (TC) - G58-23 (TC)*3
    		Always
    		Below 1 Ω
    G48-13 (TC) - G183-17 (TC)*4
    		Always
    		Below 1 Ω
    G48-13 (TC) - G184-25 (TC)*5
    		Always
    		Below 1 Ω
    Text in Illustration
    *A
    		for 1GR-FE
    *B
    		for 2TR-FE
    *C
    		for 1KD-FTV
    *D
    		for 5L-E
    *E
    		for 1GD-FTV
    *F
    		for Automatic Transmission
    *G
    		for Manual Transmission
    *a
    		Front view of DLC3
    *b
    		Front view of wire harness connector
    (to ECM)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.CHECK HARNESS AND CONNECTOR (DLC3 - BODY GROUND)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Supplemental Restraint Systems.Airbag System.Airbag System Diagnosis Circuit

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    G48-4 (CG) - Body ground
    		Always
    		Below 1 Ω
    Text in Illustration
    *a
    		Front view of DLC3


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)
  1. *1: for 1GR-FE
  2. *2: for 2TR-FE
  3. *3: for 1KD-FTV
  4. *4: for 5L-E
  5. *5: for 1GD-FTV
  6. *6: for Automatic Transmission
  7. *7: for Manual Transmission


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


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Supplemental Restraint Systems.Airbag System.Airbag System Diagnosis Circuit

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    G55-6 (TC)*1, *6 - Body ground
    		Always
    		Below 1 Ω
    G56-28 (TC)*1, *7 - Body ground
    		Always
    		Below 1 Ω
    G180-19 (TC)*2 - Body ground
    		Always
    		Below 1 Ω
    G58-23 (TC)*3 - Body ground
    		Always
    		Below 1 Ω
    G183-17 (TC)*4 - Body ground
    		Always
    		Below 1 Ω
    G184-25 (TC)*5 - Body ground
    		Always
    		Below 1 Ω
    Text in Illustration
    *A
    		for 1GR-FE
    *B
    		for 2TR-FE
    *C
    		for 1KD-FTV
    *D
    		for 5L-E
    *E
    		for 1GD-FTV
    *F
    		for Automatic Transmission
    *G
    		for Manual Transmission
    *a
    		Front view of wire harness connector
    (to ECM)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR OR EACH ECU
OK

REPLACE CENTER AIRBAG SENSOR ASSEMBLY (LandCruiser RM000003YQB01BX.html)