Dtc B1860/64 Short In Driver Side Knee Airbag 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 DRIVER SIDE KNEE AIRBAG (DRIVER SIDE KNEE SQUIB)

CHECK CONNECTOR

CHECK INSTRUMENT PANEL WIRE (DRIVER SIDE KNEE AIRBAG CIRCUIT)

CHECK CENTER AIRBAG SENSOR

DTC B1860/64 Short in Driver Side Knee Airbag Squib Circuit

DTC B1861/64 Open in Driver Side Knee Airbag Squib Circuit

DTC B1862/64 Short to GND in Driver Side Knee Airbag Squib Circuit

DTC B1863/64 Short to B+ in Driver Side Knee Airbag Squib Circuit


DESCRIPTION

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

DTC Code
DTC Detection Condition
Trouble Area
B1860/64
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 knee airbag squib circuit during the primary check.
  2. A driver side knee airbag squib malfunction.
  3. A center airbag sensor malfunction.
  1. Instrument panel wire
  2. Driver side knee airbag assembly (Driver side knee squib)
  3. Center airbag sensor assembly
B1861/64
When one of the following conditions is met:
  1. The center airbag sensor receives an open circuit signal in the driver side knee airbag squib circuit for 2 seconds.
  2. A driver side knee airbag squib malfunction.
  3. A center airbag sensor malfunction.
  1. Instrument panel wire
  2. Driver side knee airbag assembly (Driver side knee squib)
  3. Center airbag sensor assembly
B1862/64
When one of the following conditions is met:
  1. The airbag sensor center receives a short circuit to ground signal in the knee airbag (Driver side squib) circuit for 0.5 seconds.
  2. A driver side knee airbag squib malfunction.
  3. A center airbag sensor malfunction.
  1. Instrument panel wire
  2. Driver side knee airbag assembly (Driver side knee squib)
  3. Center airbag sensor assembly
B1863/64
When one of the following conditions is met:
  1. The airbag sensor center receives a short circuit to B+ signal in the knee airbag (Driver side squib) circuit for 0.5 seconds.
  2. A driver side knee airbag squib malfunction.
  3. A center airbag sensor malfunction.
  1. Instrument panel wire
  2. Driver side knee airbag assembly (Driver side knee squib)
  3. Center airbag sensor assembly
HINT:
Vehicles that are not equipped with knee airbag still contain knee airbag circuits and use substitution parts in replace of the knee airbag. If a malfunction occurs in this knee airbag circuit, DTC B1860/64, B1861/64, B1862/64 or B1863/64 is stored.

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Supplemental Restraint Systems.Airbag System. Dtc B1860/64 Short In Driver Side Knee Airbag 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).
  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 DRIVER SIDE KNEE AIRBAG (DRIVER SIDE KNEE SQUIB)


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Supplemental Restraint Systems.Airbag System. Dtc B1860/64 Short In Driver Side Knee Airbag Squib 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 driver side knee airbag.

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

    CAUTION:
    Never connect the tester to the driver side knee airbag (driver side knee 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 B1860, B1861, B1862 or B1863 is not output.
    HINT:
    Codes other than DTC B1860, B1861, B1862 and B1863 may be output at this time, but they are not related to this check.


NG
Go to step 2
OK

REPLACE DRIVER SIDE KNEE AIRBAG ASSEMBLY (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 instrument panel wire connector (on the driver side knee airbag side) is not damaged.

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


NG
REPLACE INSTRUMENT PANEL WIRE
OK


3.CHECK INSTRUMENT PANEL WIRE (DRIVER SIDE KNEE AIRBAG CIRCUIT)


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Supplemental Restraint Systems.Airbag System. Dtc B1860/64 Short In Driver Side Knee Airbag Squib 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
    E24-1 (DK+) - Body ground
    		Ignition switch ON
    		Below 1 V
    E24-2 (DK-) - 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
    E24-1 (DK+) - E24-2 (DK-)
    		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
    E24-1 (DK+) - E24-2 (DK-)
    		Always
    		1 MΩ or higher
    E24-1 (DK+) - Body ground
    		Always
    		1 MΩ or higher
    E24-2 (DK-) - Body ground
    		Always
    		1 MΩ or higher


NG
REPLACE INSTRUMENT PANEL WIRE
OK


4.CHECK CENTER AIRBAG SENSOR


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Supplemental Restraint Systems.Airbag System. Dtc B1860/64 Short In Driver Side Knee Airbag Squib Circuit

  1. Connect the connectors to the driver side knee airbag 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 B1860, B1861, B1862 or B1863 is not output.
    HINT:
    Codes other than DTC B1860, B1861, B1862 and B1863 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)