Dtc B1900/73 Short In Front Driver Side Pretensioner Squib Circuit

Restraints. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
Supplemental Restraint System. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK DRIVER SIDE FRONT SEAT OUTER BELT ASSEMBLY (DRIVER SIDE FRONT PRETENSIONER SQUIB)

CHECK CONNECTOR

CHECK FLOOR WIRE (DRIVER SIDE FRONT PRETENSIONER SQUIB CIRCUIT)

DTC B1900/73 Short in Front Driver Side Pretensioner Squib Circuit

DTC B1901/73 Open in Front Driver Side Pretensioner Squib Circuit

DTC B1902/73 Short to GND in Front Driver Side Pretensioner Squib Circuit

DTC B1903/73 Short to B+ in Front Driver Side Pretensioner Squib Circuit


DESCRIPTION

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

DTC No.
DTC Detection Condition
Trouble Area
B1900/73
Center airbag sensor receives a line short signal 5 times in the driver side front pretensioner squib circuit during primary check.
  1. Floor wire
  2. Front seat outer belt LH (Driver side front pretensioner squib) (for LHD)
  3. Front seat outer belt RH (Driver side front pretensioner squib) (for RHD)
  4. Center airbag sensor
B1901/73
Center airbag sensor receives an open signal in the driver side front pretensioner squib circuit for 2 seconds.
  1. Floor wire
  2. Front seat outer belt LH (Driver side front pretensioner squib) (for LHD)
  3. Front seat outer belt RH (Driver side front pretensioner squib) (for RHD)
  4. Center airbag sensor
B1902/73
Center airbag sensor receives a short to ground signal in the driver side front pretensioner squib circuit for 0.5 seconds.
  1. Floor wire
  2. Front seat outer belt LH (Driver side front pretensioner squib) (for LHD)
  3. Front seat outer belt RH (Driver side front pretensioner squib) (for RHD)
  4. Center airbag sensor
B1903/73
Center airbag sensor receives a short circuit to B+ signal in the driver side front pretensioner squib circuit for 0.5 seconds.
  1. Floor wire
  2. Front seat outer belt LH (Driver side front pretensioner squib) (for LHD)
  3. Front seat outer belt RH (Driver side front pretensioner squib) (for RHD)
  4. Center airbag sensor

WIRING DIAGRAM


Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Supplemental Restraint System.Airbag System. Dtc B1900/73 Short In Front Driver Side Pretensioner Squib Circuit


INSPECTION PROCEDURE

HINT:
  1. Perform the simulation method by selecting the "Check Mode" (signal check) with the intelligent tester (RAV4_ACA30 RM000000XFF05JX.html).
  2. After selecting the "Check Mode" (signal check), perform the simulation method by wiggling each connector of the airbag system or driving the vehicle on a city or rough road (RAV4_ACA30 RM000000XFF05JX.html).
1.CHECK DRIVER SIDE FRONT SEAT OUTER BELT ASSEMBLY (DRIVER SIDE FRONT PRETENSIONER SQUIB)
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Supplemental Restraint System.Airbag System. Dtc B1900/73 Short In Front Driver Side Pretensioner 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 connectors from the driver side front seat outer belt.

  1. Connect SST (resistance 2.1 Ω) to connector C.

    CAUTION:
    Never connect a tester to the front seat outer belt (driver side front pretensioner 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.
    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 on (IG), and wait for at least 60 seconds.

  1. Clear the DTCs (RAV4_ACA30 RM000000XFE06SX.html).

  1. Turn the ignition switch off.

  1. Turn the ignition switch on (IG), and wait for at least 60 seconds.

  1. Check the DTCs (RAV4_ACA30 RM000000XFE06SX.html).

    OK:
    DTC B1900, B1901, B1902, B1903 or 73 is not output.
    HINT:
    DTCs other than DTC B1900, B1901, B1902, B1903 or 73 may be output at this time, but they are not related to this check.


OK
REPLACE DRIVER SIDE FRONT SEAT OUTER BELT ASSEMBLY
NG


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 floor wire connector (on the driver side front seat outer belt) is not damaged.

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


NG
REPAIR OR REPLACE FLOOR WIRE
OK


3.CHECK FLOOR WIRE (DRIVER SIDE FRONT PRETENSIONER SQUIB CIRCUIT)
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Supplemental Restraint System.Airbag System. Dtc B1900/73 Short In Front Driver Side Pretensioner Squib Circuit

  1. Disconnect the connector from 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 on (IG).

  1. Measure the voltage of the wire harness side connector.

    Standard voltage:
    for LHD:
    Tester Connection
    		Specified Condition
    K9-1 (L+) - Body ground
    		Below 1 V
    K9-2 (L-) - Body ground
    		Below 1 V
    for RHD:
    Tester Connection
    		Specified Condition
    L5-1 (R+) - Body ground
    		Below 1 V
    L5-2 (R-) - Body ground
    		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 of the wire harness side connector.

    Standard resistance:
    for LHD:
    Tester Connection
    		Specified Condition
    K9-1 (L+) - K9-2 (L-)
    		Below 1 Ω
    K9-1 (L+) - Body ground
    		1 MΩ or higher
    K9-2 (L-) - Body ground
    		1 MΩ or higher
    for RHD:
    Tester Connection
    		Specified Condition
    L5-1 (R+) - L5-2 (R-)
    		Below 1 Ω
    L5-1 (R+) - Body ground
    		1 MΩ or higher
    L5-2 (R-) - Body ground
    		1 MΩ or higher

  1. Release the activation prevention mechanism built into connector B (RAV4_ACA30 RM000000XFD06JX.html).

  1. Measure the resistance of the wire harness side connector.

    Standard resistance:
    for LHD:
    Tester Connection
    		Specified Condition
    K9-1 (L+) - K9-2 (L-)
    		1 MΩ or higher
    for RHD:
    Tester Connection
    		Specified Condition
    L5-1 (R+) - L5-2 (R-)
    		1 MΩ or higher


NG
REPAIR OR REPLACE FLOOR WIRE
OK

REPLACE CENTER AIRBAG SENSOR ASSEMBLY