AIRBAG SYSTEM, Diagnostic DTC:B1632/81, B1633/81

DTC Code DTC Name
B1632/81 Lost Communication with Rear Airbag Sensor RH
B1633/81 Rear Airbag Sensor Assembly RH Initialization Incomplete

DESCRIPTION

The side collision sensor RH circuit (to determine deployment of the front seat side airbag assembly RH and curtain shield airbag assembly RH) is composed of the center airbag sensor assembly, side airbag sensor RH and rear airbag sensor RH.

The side airbag sensor RH and rear airbag sensor RH detect impacts to the vehicle and send signals to the center airbag sensor assembly to determine if the airbag should be deployed.

These DTCs are stored when a malfunction is detected for the side collision sensor RH circuit (to determine deployment of the front seat side airbag assembly RH and curtain shield airbag assembly RH).

DTC No. DTC Detection Condition Trouble Area

B1632/81

B1633/81

  • The center airbag sensor assembly receives a line short circuit signal, an open circuit signal, a short circuit to ground signal or a short circuit to B+ signal in the side collision sensor RH circuit (to determine deployment of the front seat side airbag assembly RH and curtain shield airbag assembly RH).

  • Side airbag sensor RH malfunction

  • Rear airbag sensor RH malfunction

  • Center airbag sensor assembly malfunction

  • Floor wire

  • Side airbag sensor RH

  • Rear airbag sensor RH

  • Center airbag sensor assembly

WIRING DIAGRAM

A005L7QE01

PROCEDURE


  1. CHECK CONNECTORS


    1. Turn the ignition switch off.

    2. Disconnect the cable from the negative (-) battery terminal.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

    3. Check that the connectors are properly connected to the center airbag sensor assembly, side airbag sensor RH and rear airbag sensor RH.

      OK
      The connectors are properly connected.

      Tech Tips

      If the connectors are not connected securely, reconnect the connectors and proceed to the next inspection.

    4. Disconnect the connectors from the center airbag sensor assembly, side airbag sensor RH and rear airbag sensor RH.

    5. Check that the terminals of connectors are not damaged.

      OK
      The terminals are not deformed or damaged.

    NG

    REPLACE FLOOR WIRE

    OK

  2. CHECK FLOOR WIRE (OPEN)


    1. Using a service wire, connect terminals 2 (BCR+) and 1 (BCR-) of connector C.

      A005I3GE02
      Text in Illustration
      *1 Rear Airbag Sensor RH *2 Side Airbag Sensor RH
      *3 Floor wire *4 Connector B
      *5 Connector C *6 Service Wire
      *a

      Front view of wire harness connector

      (to Side Airbag Sensor RH)

      		 *b

      Front view of wire harness connector

      (to Rear Airbag Sensor RH)

      Note

      Do not forcibly insert the service wire into the terminals of the connector when connecting.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K22-1 (BCR+) - K22-2 (BCR-) Always Below 1 Ω

    NG

    REPLACE FLOOR WIRE

    OK

  3. CHECK FLOOR WIRE (SHORT)


    1. A005HTBE02
      Text in Illustration
      *1 Rear Airbag Sensor RH
      *2 Side Airbag Sensor RH
      *3 Floor wire
      *4 Connector B
      *a

      Front view of wire harness connector

      (to Side Airbag Sensor RH)

      Disconnect the service wire from connector C.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K22-1 (BCR+) - K22-2 (BCR-) Always 1 MΩ or higher

    NG

    REPLACE FLOOR WIRE

    OK

  4. CHECK FLOOR WIRE (SHORT TO B+)


    1. A005HTBE02
      Text in Illustration
      *1 Rear Airbag Sensor RH
      *2 Side Airbag Sensor RH
      *3 Floor wire
      *4 Connector B
      *a

      Front view of wire harness connector

      (to Side Airbag Sensor RH)

      Connect the cable to the negative (-) battery terminal.

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      K22-1 (BCR+) - Body ground Ignition switch ON Below 1 V
      K22-2 (BCR-) - Body ground Ignition switch ON Below 1 V

    NG

    REPLACE FLOOR WIRE

    OK

  5. CHECK FLOOR WIRE (SHORT TO GROUND)


    1. A005HTBE02
      Text in Illustration
      *1 Rear Airbag Sensor RH
      *2 Side Airbag Sensor RH
      *3 Floor wire
      *4 Connector B
      *a

      Front view of wire harness connector

      (to Side Airbag Sensor RH)

      Turn the ignition switch off.

    2. Disconnect the cable from the negative (-) battery terminal.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K22-1 (BCR+) - Body ground Always 1 MΩ or higher
      K22-2 (BCR-) - Body ground Always 1 MΩ or higher

    NG

    REPLACE FLOOR WIRE

    OK

  6. CHECK SIDE AIRBAG SENSOR RH


    1. Connect the connectors to the rear airbag sensor RH and center airbag sensor assembly.

    2. A005IJYE12
      Text in Illustration
      *1 Side Airbag Sensor LH
      *2 Center Airbag Sensor Assembly

      Interchange the side airbag sensor RH with the side airbag sensor LH and connect the connectors to them.

    3. Connect the cable to the negative (-) battery terminal.

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

    5. Clear the DTCs stored in the memory Click here.

    6. Turn the ignition switch off.

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

    8. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B1632/81 or B1633/81 is output. A
      DTC B1637/82 or B1638/82 is output. B
      DTCs B1632/81, B1633/81, B1637/82 or B1638/82 is not output. C

      Tech Tips

      Codes other than DTCs B1632/81, B1633/81, B1637/82 and B1638/82 may be output at this time, but they are not related to this check.


    B

    REPLACE SIDE AIRBAG SENSOR RH Click here

    C

    USE SIMULATION METHOD TO CHECK Click here

    A

  7. CHECK REAR AIRBAG SENSOR RH


    1. Turn the ignition switch off.

    2. Disconnect the cable from the negative (-) battery terminal.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

    3. Return the side airbag sensor RH and the side airbag sensor LH to their original positions and connect the connectors to them.

    4. A005L1SE19
      Text in Illustration
      *1 Rear Airbag Sensor LH
      *2 Side Airbag Sensor RH

      Interchange the rear airbag sensor RH with the rear airbag sensor LH and connect the connectors to them.

    5. Connect the cable to the negative (-) battery terminal.

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

    7. Clear the DTCs stored in the memory Click here.

    8. Turn the ignition switch off.

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

    10. Check for DTCs Click here.

      Result
      Result Proceed to
      DTCs B1632/81, B1633/81, B1637/82 or B1638/82 is not output. A
      DTC B1632/81 or B1633/81 is output. B
      DTC B1637/82 or B1638/82 is output. C

      Tech Tips

      Codes other than DTCs B1632/81, B1633/81, B1637/82 and B1638/82 may be output at this time, but they are not related to this check.


    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

    C

    REPLACE REAR AIRBAG SENSOR RH Click here