Dtc B1840/59 Short In Curtain Shield Squib Rh 2Nd Step Circuit

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

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK CURTAIN SHIELD AIRBAG RH (CURTAIN SHIELD SQUIB RH 2ND STEP)

CHECK CONNECTOR

CHECK NO. 2 FLOOR WIRE (CURTAIN SHIELD AIRBAG RH 2ND STEP CIRCUIT)

CHECK CENTER AIRBAG SENSOR

DTC B1840/59 Short in Curtain Shield Squib RH 2nd Step Circuit

DTC B1841/59 Open in Curtain Shield Squib RH 2nd Step Circuit

DTC B1842/59 Short to GND in Curtain Shield Squib RH 2nd Step Circuit

DTC B1843/59 Short to B+ in Curtain Shield Squib RH 2nd Step Circuit


DESCRIPTION

The curtain shield squib RH 2nd step circuit consists of the center airbag sensor and the curtain shield airbag RH.
The circuit instructs the SRS to deploy when deployment conditions are met.
These DTCs are stored when a malfunction is detected in the curtain shield squib RH 2nd step circuit.

DTC Code
DTC Detection Condition
Trouble Area
B1840/59
When one of the following conditions is met:
  1. The center airbag sensor receives a line short circuit signal 5 times in the curtain shield squib RH 2nd step circuit during the primary check.
  2. A curtain shield squib RH malfunction.
  3. A center airbag sensor malfunction.
  1. No. 2 floor wire
  2. Curtain shield airbag assembly RH (Curtain shield squib RH 2nd step)
  3. Center airbag sensor assembly
B1841/59
When one of the following conditions is met:
  1. The center airbag sensor receives an open circuit signal in the curtain shield squib RH 2nd step circuit for 2 seconds.
  2. A curtain shield squib RH malfunction.
  3. A center airbag sensor malfunction.
  1. No. 2 floor wire
  2. Curtain shield airbag assembly RH (Curtain shield squib RH 2nd step)
  3. Center airbag sensor assembly
B1842/59
When one of the following conditions is met:
  1. The center airbag sensor receives a short circuit to ground signal in the curtain shield squib RH 2nd step circuit for 0.5 seconds.
  2. A curtain shield squib RH malfunction.
  3. A center airbag sensor malfunction.
  1. No. 2 floor wire
  2. Curtain shield airbag assembly RH (Curtain shield squib RH 2nd step)
  3. Center airbag sensor assembly
B1843/59
When one of the following conditions is met:
  1. The center airbag sensor receives a short circuit to B+ signal in the curtain shield squib RH 2nd step circuit for 0.5 seconds.
  2. A curtain shield squib RH malfunction.
  3. A center airbag sensor malfunction.
  1. No. 2 floor wire
  2. Curtain shield airbag assembly RH (Curtain shield squib RH 2nd step)
  3. Center airbag sensor assembly

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Supplemental Restraint Systems.Airbag System. Dtc B1840/59 Short In Curtain Shield Squib Rh 2Nd Step 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 CURTAIN SHIELD AIRBAG RH (CURTAIN SHIELD SQUIB RH 2ND STEP)


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Supplemental Restraint Systems.Airbag System. Dtc B1840/59 Short In Curtain Shield Squib Rh 2Nd Step 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 curtain shield squib RH 2nd step.

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

    CAUTION:
    Never connect the tester to the curtain shield airbag RH (curtain shield squib RH 2nd step) 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 B1840, B1841, B1842 or B1843 is not output.
    HINT:
    Codes other than DTC B1840, B1841, B1842 and B1843 may be output at this time, but they are not related to this check.


NG
Go to step 2
OK

REPLACE CURTAIN SHIELD AIRBAG ASSEMBLY RH (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 C.

  1. Check that the No. 2 floor wire connector (on the curtain shield squib RH 2nd step side) is not damaged.

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


NG
REPLACE NO. 2 FLOOR WIRE
OK


3.CHECK NO. 2 FLOOR WIRE (CURTAIN SHIELD AIRBAG RH 2ND STEP CIRCUIT)


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Supplemental Restraint Systems.Airbag System. Dtc B1840/59 Short In Curtain Shield Squib Rh 2Nd Step Circuit

  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
    L20-1 (CR2+) - Body ground
    		Ignition switch ON
    		Below 1 V
    L20-2 (CR2-) - 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
    L20-1 (CR2+) - L20-2 (CR2-)
    		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
    L20-1 (CR2+) - L20-2 (CR2-)
    		Always
    		1 MΩ or higher
    L20-1 (CR2+) - Body ground
    		Always
    		1 MΩ or higher
    L20-2 (CR2-) - Body ground
    		Always
    		1 MΩ or higher


NG
REPLACE NO. 2 FLOOR WIRE
OK


4.CHECK CENTER AIRBAG SENSOR


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Supplemental Restraint Systems.Airbag System. Dtc B1840/59 Short In Curtain Shield Squib Rh 2Nd Step Circuit

  1. Connect the connectors to the curtain shield squib RH 2nd step 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 B1840, B1841, B1842 or B1843 is not output.
    HINT:
    Codes other than DTC B1840, B1841, B1842 and B1843 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)