AIRBAG SYSTEM, Diagnostic DTC:B1633/81, B1638/82

DTC Code DTC Name
B1633/81 Rear Airbag Sensor Assembly RH Initialization Incomplete
B1638/82 Rear Airbag Sensor Assembly LH Initialization Incomplete

DESCRIPTION

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

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

DTC B1633/81 or B1638/82 is stored when a malfunction is detected in the circuit for the rear side collision sensor LH or RH (to determine deployment of the rear seat airbag LH or RH, rear seat belt pretensioner LH or RH and curtain shield airbag LH or RH).

DTC Code DTC Detection Condition Trouble Area
B1633/81

One of the following conditions is met:


  • The center airbag sensor assembly detects a line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to B+ signal in the circuit for the rear side collision sensor RH (to determine deployment of the rear seat airbag RH, rear seat belt pretensioner RH and curtain shield airbag RH) for 2 seconds.

  • A rear airbag sensor RH malfunction.

  • A center airbag sensor assembly malfunction.

  • Floor wire

  • Rear airbag sensor RH

  • Center airbag sensor assembly
B1638/82

One of the following conditions is met:


  • The center airbag sensor assembly detects a line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to B+ signal in the circuit for the rear side collision sensor LH (to determine deployment of the rear seat airbag LH, rear seat belt pretensioner LH and curtain shield airbag LH) for 2 seconds.

  • A rear airbag sensor LH malfunction.

  • A center airbag sensor assembly malfunction.

  • No. 2 floor wire

  • Rear airbag sensor LH

  • Center airbag sensor assembly

WIRING DIAGRAM

A01FFG2E10
A01FFG2E11

INSPECTION PROCEDURE

Note


  • After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work Click here.

  • When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected Click here.

PROCEDURE


  1. CHECK PAST DTC


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

    2. Check for DTCs Click here.

      OK
      DTC B1632/81 and B1637/82 are not output.

    NG

    GO TO DTC B1632/81 Click here

    OK

  2. CHECK FOR DTC


    1. Turn the engine switch off.

      Tech Tips

      If a communication error occurs, DTCs for both the LH and RH sides will be stored simultaneously. The malfunctioning area can be identified by turning the engine switch off and then on (IG) again.

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

    3. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B1633/81 and B1638/82 are not output A
      DTC B1638/82 is output B
      DTC B1633/81 is output C

      Tech Tips

      Codes other than DTC B1633/81 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

    CHECK CONNECTION OF CONNECTORS Click here

    C

  3. CHECK CONNECTION OF CONNECTORS


    1. Turn the engine switch off.

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

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

      OK
      The connectors are properly connected.

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  4. CHECK CONNECTORS


    1. Disconnect the connectors from the center airbag sensor assembly and rear airbag sensor RH.

    2. A01FHXXE02
      Text in Illustration
      *1 Rear Airbag Sensor RH
      *2 Center Airbag Sensor Assembly
      *3 Floor Wire

      Check that the connectors (on the center airbag sensor assembly side and rear airbag sensor RH side) are not damaged.

      OK
      The connectors are not deformed or damaged.

    NG

    REPLACE FLOOR WIRE

    OK

  5. CHECK REAR AIRBAG SENSOR RH CIRCUIT


    1. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

      A01FI96E03
      Text in Illustration
      *1 Rear Airbag Sensor RH *2 Center Airbag Sensor Assembly
      *3 Floor Wire *4 Connector C
      *5 Connector B *6 Service Wire
      *a

      Front view of wire harness connector

      (to Rear Airbag Sensor RH)

      		 *b

      Rear view of wire harness connector

      (to Center Airbag Sensor Assembly)

    2. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      T7-4 (BCR+) - Body ground Engine switch on (IG) Below 1 V
      T7-3 (BCR-) - Body ground Engine switch on (IG) Below 1 V

    4. Turn the engine switch off.

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

    6. Using a service wire, connect terminals 24 (BBR+) and 23 (BBR-) of connector B.

      Note

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      T7-4 (BCR+) - T7-3 (BCR-) Always Below 1 Ω

    8. Disconnect the service wire from connector B.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      T7-4 (BCR+) - T7-3 (BCR-) Always 1 MΩ or higher
      T7-4 (BCR+) - Body ground Always 1 MΩ or higher
      T7-3 (BCR-) - Body ground Always 1 MΩ or higher

    NG

    REPLACE FLOOR WIRE

    OK

  6. CHECK REAR AIRBAG SENSOR RH


    1. A01FDIXE38
      Text in Illustration
      *1 Rear Airbag Sensor LH
      *2 Center Airbag Sensor Assembly

      Connect the connector to the center airbag sensor assembly.

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

    3. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

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

    5. Clear the DTCs stored in memory Click here.

    6. Turn the engine switch off.

    7. Turn the engine switch on (IG), and wait for at least 90 seconds.

    8. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B1633/81 and B1638/82 are not output A
      DTC B1638/82 is output B
      DTC B1633/81 is output C

      Tech Tips

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

    9. Turn the engine switch off.

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

    11. Return the rear airbag sensor LH and RH to their original positions and connect the connectors to them.


    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE REAR AIRBAG SENSOR RH Click here

    C

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

  7. CHECK CONNECTION OF CONNECTORS


    1. Turn the engine switch off.

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

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

      OK
      The connectors are properly connected.

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  8. CHECK CONNECTORS


    1. Disconnect the connectors from the center airbag sensor assembly and rear airbag sensor LH.

    2. A01FFM5E04
      Text in Illustration
      *1 Rear Airbag Sensor LH
      *2 Center Airbag Sensor Assembly
      *3 No. 2 Floor Wire

      Check that the connectors (on the center airbag sensor assembly side and rear airbag sensor LH side) are not damaged.

      OK
      The connectors are not deformed or damaged.

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  9. CHECK REAR AIRBAG SENSOR LH CIRCUIT


    1. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

      A01FDPJE03
      Text in Illustration
      *1 Rear Airbag Sensor LH *2 Center Airbag Sensor Assembly
      *3 No. 2 Floor Wire *4 Connector C
      *5 Connector B *6 Service Wire
      *a

      Front view of wire harness connector

      (to Rear Airbag Sensor LH)

      		 *b

      Rear view of wire harness connector

      (to Center Airbag Sensor Assembly)

    2. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      U9-4 (BCL+) - Body ground Engine switch on (IG) Below 1 V
      U9-3 (BCL-) - Body ground Engine switch on (IG) Below 1 V

    4. Turn the engine switch off.

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

    6. Using a service wire, connect terminals 17 (BBL+) and 18 (BBL-) of connector B.

      Note

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      U9-4 (BCL+) - U9-3 (BCL-) Always Below 1 Ω

    8. Disconnect the service wire from connector B.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      U9-4 (BCL+) - U9-3 (BCL-) Always 1 MΩ or higher
      U9-4 (BCL+) - Body ground Always 1 MΩ or higher
      U9-3 (BCL-) - Body ground Always 1 MΩ or higher

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  10. CHECK REAR AIRBAG SENSOR LH


    1. A01FGF1E03
      Text in Illustration
      *1 Rear Airbag Sensor RH
      *2 Center Airbag Sensor Assembly

      Connect the connector to the center airbag sensor assembly.

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

    3. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

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

    5. Clear the DTCs stored in memory Click here.

    6. Turn the engine switch off.

    7. Turn the engine switch on (IG), and wait for at least 90 seconds.

    8. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B1633/81 and B1638/82 are not output A
      DTC B1633/81 is output B
      DTC B1638/82 is output C

      Tech Tips

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

    9. Turn the engine switch off.

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

    11. Return the rear airbag sensor RH and LH to their original positions and connect the connectors to them.


    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE REAR AIRBAG SENSOR LH Click here

    C

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here