Dtc B1800/51 Short In Driver Side Squib Circuit

Vehicle Interior. Land Cruiser. Urj200, 202 Grj200 Vdj200
Supplemental Restraint Systems. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK STEERING PAD (DRIVER SIDE SQUIB)

CHECK CONNECTOR

CHECK DRIVER SIDE SQUIB CIRCUIT

CHECK CENTER AIRBAG SENSOR

CHECK INSTRUMENT PANEL WIRE (CENTER AIRBAG SENSOR - SPIRAL CABLE)

DTC B1800/51 Short in Driver Side Squib Circuit

DTC B1801/51 Open in Driver Side Squib Circuit

DTC B1802/51 Short to GND in Driver Side Squib Circuit

DTC B1803/51 Short to B+ in Driver Side Squib Circuit


DESCRIPTION

  1. The driver side squib circuit consists of the center airbag sensor, the spiral cable, and the steering pad.
  2. The circuit instructs the SRS to deploy when deployment conditions are met.
  3. These DTCs are stored when a malfunction is detected in the driver side squib circuit.

DTC Code
DTC Detection Condition
Trouble Area
B1800/51
When one of the following conditions is met:
  1. The center airbag sensor receives a line short circuit signal 5 times in the driver side squib circuit during the primary check.
  2. A driver side squib malfunction.
  3. A spiral cable malfunction.
  4. A center airbag sensor malfunction.
  1. Instrument panel wire
  2. Spiral cable
  3. Steering pad (Driver side squib)
  4. Center airbag sensor assembly
B1801/51
When one of the following conditions is met:
  1. The A center airbag sensor receives an open circuit signal in the driver side squib circuit for 2 seconds.
  2. A driver side squib malfunction.
  3. A spiral cable malfunction.
  4. A center airbag sensor malfunction.
  1. Instrument panel wire
  2. Spiral cable
  3. Steering pad (Driver side squib)
  4. Center airbag sensor assembly
B1802/51
When one of the following conditions is met:
  1. The center airbag sensor receives a short circuit to ground signal in the driver side squib circuit for 0.5 seconds.
  2. A driver side squib malfunction.
  3. A spiral cable malfunction.
  4. A center airbag sensor malfunction.
  1. Instrument panel wire
  2. Spiral cable
  3. Steering pad (Driver side squib)
  4. Center airbag sensor assembly
B1803/51
When one of the following conditions is met:
  1. The center airbag sensor receives a short circuit to B+ signal in the driver side squib circuit for 0.5 seconds.
  2. A driver side squib malfunction.
  3. A spiral cable malfunction.
  4. A center airbag sensor malfunction.
  1. Instrument panel wire
  2. Spiral cable
  3. Steering pad (Driver side squib)
  4. Center airbag sensor assembly

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Supplemental Restraint Systems.Airbag System. Dtc B1800/51 Short In Driver Side Squib 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 (Click here).
  2. When disconnecting the cable, some systems need to be initialized after the cable is reconnected (Click here).
HINT:
To perform the simulation method, enter the check mode (signal check) with the intelligent tester (Click here), and then wiggle each connector of the airbag system or drive the vehicle on various type of road (Click here).
1.CHECK STEERING PAD (DRIVER SIDE SQUIB)


  1. Turn the ignition switch off.


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Supplemental Restraint Systems.Airbag System. Dtc B1800/51 Short In Driver Side Squib Circuit

  1. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

  1. Disconnect the connectors from the steering pad.

  1. Connect the white wire side of SST (resistance: 2.1 Ω) to connector E (orange connector).

    CAUTION:
    Never connect the tester to the steering pad (driver side squib) for measurement, as this may lead to a serious injury due to airbag deployment.
    NOTICE:
    1. Do not forcibly insert SST into the terminals of the connector when connecting SST.
    2. Insert SST straight into the terminals of the connector.
SST
09843-18061

  1. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

  1. Turn the ignition switch to ON, and wait for at least 60 seconds.

  1. Clear the DTCs (Click here).

  1. Turn the ignition switch off.

  1. Turn the ignition switch to ON, and wait for at least 60 seconds.

  1. Check for DTCs (Click here).

    OK:
    DTC B1800, B1801, B1802 or B1803 is not output.
    HINT:
    Codes other than DTC B1800, B1801, B1802 and B1803 may be output at this time, but they are not related to this check.


NG
Go to step 2
OK

REPLACE STEERING PAD (Click here)

2.CHECK CONNECTOR

  1. Turn the ignition switch off.

  1. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

  1. Disconnect SST from connector E.

  1. Check that the spiral cable connectors (on the steering pad side) are not damaged.

    OK:
    The lock button is not disengaged, and the claw of the lock is not deformed or damaged.


NG
REPLACE SPIRAL CABLE (Click here)
OK


3.CHECK DRIVER SIDE SQUIB CIRCUIT


  1. Disconnect the connectors from the center airbag sensor.


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Supplemental Restraint Systems.Airbag System. Dtc B1800/51 Short In Driver Side Squib Circuit

  1. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    z39-1 - Body ground
    		Ignition switch ON
    		Below 1 V
    z39-2 - Body ground
    		Ignition switch ON
    		Below 1 V

  1. Turn the ignition switch off.

  1. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    z39-1 - z39-2
    		Always
    		Below 1 Ω

  1. Release the activation prevention mechanism built into connector B (Click here).

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    z39-1 - z39-2
    		Always
    		1 MΩ or higher
    z39-1 - Body ground
    		Always
    		1 MΩ or higher
    z39-2 - Body ground
    		Always
    		1 MΩ or higher


NG
Go to step 5
OK


4.CHECK CENTER AIRBAG SENSOR


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Supplemental Restraint Systems.Airbag System. Dtc B1800/51 Short In Driver Side Squib Circuit

  1. Connect the connectors to the steering pad and the center airbag sensor.

  1. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

  1. Turn the ignition switch to ON, and wait for at least 60 seconds.

  1. Clear the DTCs (Click here).

  1. Turn the ignition switch off.

  1. Turn the ignition switch to ON, and wait for at least 60 seconds.

  1. Check for DTCs (Click here).

    OK:
    DTC B1800, B1801, B1802 or B1803 is not output.
    HINT:
    Codes other than DTC B1800, B1801, B1802 and B1803 may be output at this time, but they are not related to this check.


NG
REPLACE CENTER AIRBAG SENSOR ASSEMBLY (Click here)
OK

USE SIMULATION METHOD TO CHECK (Click here)

5.CHECK INSTRUMENT PANEL WIRE (CENTER AIRBAG SENSOR - SPIRAL CABLE)


  1. Restore the released activation prevention mechanism of connector B to its original condition.


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Supplemental Restraint Systems.Airbag System. Dtc B1800/51 Short In Driver Side Squib Circuit

  1. Disconnect the instrument panel wire connector from the spiral cable.

  1. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    E13-1 (D+) - Body ground
    		Ignition switch ON
    		Below 1 V
    E13-2 (D-) - Body ground
    		Ignition switch ON
    		Below 1 V

  1. Turn the ignition switch off.

  1. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E13-1 (D+) - E13-2 (D-)
    		Always
    		Below 1 Ω

  1. Release the activation prevention mechanism built into connector B (Click here).

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E13-1 (D+) - E13-2 (D-)
    		Always
    		1 MΩ or higher
    E13-1 (D+) - Body ground
    		Always
    		1 MΩ or higher
    E13-2 (D-) - Body ground
    		Always
    		1 MΩ or higher


NG
REPLACE INSTRUMENT PANEL WIRE
OK

REPLACE SPIRAL CABLE (Click here)