Dtc B1820/55 Short In Side Squib Rh Circuit

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

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK FRONT SEAT AIRBAG RH (SIDE SQUIB RH)

CHECK NO. 2 FLOOR WIRE (SIDE SQUIB RH CIRCUIT)

CHECK CENTER AIRBAG SENSOR

DTC B1820/55 Short in Side Squib RH Circuit

DTC B1821/55 Open in Side Squib RH Circuit

DTC B1822/55 Short to GND in Side Squib RH Circuit

DTC B1823/55 Short to B+ in Side Squib RH Circuit


DESCRIPTION

The side squib RH circuit consists of the center airbag sensor and the front seat airbag RH.
This circuit instructs the SRS to deploy when deployment conditions are met.
These DTCs are stored when a malfunction is detected in the side squib RH circuit.

DTC Code
DTC Detection Condition
Trouble Area
B1820/55
When one of the following conditions is met:
  1. The center airbag sensor receives a line short circuit signal 5 times in the side squib RH circuit during the primary check.
  2. A side squib RH malfunction.
  3. A center airbag sensor malfunction.
  1. No. 2 floor wire
  2. Front seat airbag assembly RH (Side squib RH)
  3. Center airbag sensor assembly
B1821/55
When one of the following conditions is met:
  1. The center airbag sensor receives an open circuit signal in the side squib RH circuit for 2 seconds.
  2. A side squib RH malfunction.
  3. A center airbag sensor malfunction.
  1. No. 2 floor wire
  2. Front seat airbag assembly RH (Side squib RH)
  3. Center airbag sensor assembly
B1822/55
When one of the following conditions is met:
  1. The center airbag sensor receives a short circuit to ground signal in the side squib RH circuit for 0.5 seconds.
  2. A side squib RH malfunction.
  3. A center airbag sensor malfunction.
  1. No. 2 floor wire
  2. Front seat airbag assembly RH (Side squib RH)
  3. Center airbag sensor assembly
B1823/55
When one of the following conditions is met:
  1. The center airbag sensor receives a short circuit to B+ signal in the side squib RH circuit for 0.5 seconds.
  2. A side squib RH malfunction.
  3. A center airbag sensor malfunction.
  1. No. 2 floor wire
  2. Front seat airbag assembly RH (Side squib RH)
  3. Center airbag sensor assembly

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Supplemental Restraint Systems.Airbag System. Dtc B1820/55 Short In Side Squib Rh 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).
  3. After replacing the center airbag sensor assembly, refer to initialization (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 FRONT SEAT AIRBAG RH (SIDE SQUIB RH)


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Supplemental Restraint Systems.Airbag System. Dtc B1820/55 Short In Side Squib Rh Circuit

  1. Turn the ignition switch off.

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

  1. Disconnect the connector from the front seat airbag RH.

  1. Connect the red wire side of SST (resistance: 2.1 Ω) to connector C.

    CAUTION:
    Never connect the tester to the front seat airbag RH (side squib RH) 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 B1820, B1821, B1822 or B1823 is not output.
    HINT:
    Codes other than DTC B1820, B1821, B1822 and B1823 may be output at this time, but they are not related to this check.
    Result
    Result
    		Proceed to
    OK (for Manual Seat)
    		A
    OK (for Power Seat)
    		B
    NG
    		C


B
REPLACE FRONT SEAT AIRBAG ASSEMBLY RH (Click here)

C
Go to step 2
A

REPLACE FRONT SEAT AIRBAG ASSEMBLY RH (Click here)

2.CHECK NO. 2 FLOOR WIRE (SIDE SQUIB RH CIRCUIT)


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Supplemental Restraint Systems.Airbag System. Dtc B1820/55 Short In Side Squib Rh Circuit

  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 C.

  1. Disconnect the connectors from the center airbag sensor.

  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
    Lz1-1 (SFR+) - Body ground
    		Ignition switch ON
    		Below 1 V
    Lz1-2 (SFR-) - 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
    Lz1-1 (SFR+) - Lz1-2 (SFR-)
    		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
    Lz1-1 (SFR+) - Lz1-2 (SFR-)
    		Always
    		1 MΩ or higher
    Lz1-1 (SFR+) - Body ground
    		Always
    		1 MΩ or higher
    Lz1-2 (SFR-) - Body ground
    		Always
    		1 MΩ or higher


NG
REPLACE NO. 2 FLOOR WIRE
OK


3.CHECK CENTER AIRBAG SENSOR


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Supplemental Restraint Systems.Airbag System. Dtc B1820/55 Short In Side Squib Rh Circuit

  1. Connect the connectors to the front seat airbag RH 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 B1820, B1821, B1822 or B1823 is not output.
    HINT:
    Codes other than DTC B1820, B1821, B1822 and B1823 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)