AIRBAG SYSTEM, Diagnostic DTC:B1633/81

DTC Code DTC Name
B1633/81 Driver Side Rear Airbag Sensor Initialization Incomplete

DESCRIPTION

The rear airbag sensor RH is composed of a safing sensor, diagnostic circuit, lateral deceleration sensor, etc. When the airbag sensor assembly receives a signal from the lateral deceleration sensor, the airbag sensor assembly judges whether the SRS should be activated.If a malfunction is detected in the side satellite sensor bus circuit, the airbag sensor assembly stores DTC B1633/81.

DTC No. Detection Item DTC Detection Condition Trouble Area Test Mode / Check Mode
B1633/81 Driver Side Rear Airbag Sensor Initialization Incomplete

  • The airbag sensor assembly detects a line short, short to ground or B+,or an open in the rear airbag sensor RH circuit.

  • Side airbag sensor assembly RH malfunction

  • Rear airbag sensor RH malfunction

  • Airbag sensor assembly malfunction

  • No.2 floor wire

  • Front door wire RH

  • Side airbag sensor assembly RH

  • Airbag sensor assembly

 Does not apply to test/check mode

WIRING DIAGRAM

A01MHQWE05
*a Side Airbag Sensor Assembly RH
*b Door Side Airbag Sensor RH
*c Rear Airbag Sensor RH
*d Airbag Sensor Assembly

CAUTION / NOTICE / HINT

Note


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

    Click here

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

    Click here

  • After replacing the airbag sensor assembly, refer to initialization.

    Click here

Tech Tips

To reproduce the DTC, wiggle each of the SRS airbag system connectors, or drive the vehicle on actual city roads or rough roads.

Click here

PROCEDURE


  1. CHECK HISTORY DTC


    1. Check for history DTCs.

      Click here


      Body Electrical > SRS Airbag > Trouble Codes
      Result
      Result Proceed to
      History DTC B1632/81 is output A
      History DTC B1632/81 is not output B

    A

    GO TO DTC B1632/81 Click here

    B

  2. CHECK DTC


    1. Turn the power switch off.

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

    3. Clear the DTCs stored in memory.

      Click here


      Body Electrical > SRS Airbag > Clear DTCs

    4. Turn the power switch off.

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

    6. Check for DTCs.

      Click here


      Body Electrical > SRS Airbag > Trouble Codes
      Result
      Result Proceed to
      DTC B1633/81 is output A
      DTC B1633/81 is not output B

      Tech Tips

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


    B

    USE SIMULATION METHOD TO CHECK Click here

    A

  3. CHECK CONNECTION OF CONNECTORS


    1. Turn the power switch off.

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

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

      OK
      The connectors are properly connected.
      Result
      Proceed to
      OK
      NG

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  4. CHECK CONNECTORS


    1. A01MIJ9C01
      *1 Rear Airbag Sensor RH
      *2 Side Airbag Sensor Assembly RH
      *3 No.2 Floor Wire

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

    2. Check that the terminals of the connectors are not deformed or damaged.

      OK
      The terminals are not deformed or damaged.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  5. CHECK REAR AIRBAG SENSOR RH CIRCUIT


    1. A01MI5KC01
      *1 Rear Airbag Sensor RH
      *2 Side Airbag Sensor Assembly RH
      *3 No.2 Floor Wire
      *a

      Front view of wire harness connector

      (to Rear airbag sensor RH)
      *b

      Rear view of wire harness connector

      (to Side Airbag Sensor Assembly RH)
      *c Service Wire

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

    2. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      Q5-4 (BCR+) - Body ground Power switch on (IG) Below 1 V
      Q5-3 (BCR-) - Body ground Power switch on (IG) Below 1 V

    4. Turn the power switch off.

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

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

      Note

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Q5-4 (BCR+) - Q5-3 (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
      Q5-4 (BCR+) - Q5-3 (BCR-) Always 1 MΩ or higher

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Q5-4 (BCR+) - Body ground Always 1 MΩ or higher
      Q5-3 (BCR-) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  6. CHECK REAR AIRBAG SENSOR RH


    1. A01MJ3MC01
      *1 Rear Airbag Sensor LH
      *2 Side Airbag Sensor Assembly RH

      Connect the connector to side airbag sensor assembly RH.

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

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

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

    5. Clear the DTCs stored in memory.

      Click here


      Body Electrical > SRS Airbag > Clear DTCs

    6. Turn the power switch off.

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

    8. Check for DTCs.

      Click here


      Body Electrical > SRS Airbag > Trouble Codes
      Result
      Result Proceed to
      DTC B1633/81 is output A
      DTC B1638/82 is output B
      DTC B1633/81 and B1638/82 are not output C

      Tech Tips

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

    9. Turn the power switch off.

    10. Disconnect the cable from the negative (-) auxiliary 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.


    B

    REPLACE REAR AIRBAG SENSOR RH Click here

    C

    USE SIMULATION METHOD TO CHECK Click here

    A

  7. CHECK SIDE AIRBAG SENSOR ASSEMBLY RH


    1. A01MIISC01
      *1 Side Airbag Sensor Assembly LH
      *2 Airbag Sensor Assembly

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

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

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

    4. Clear the DTCs stored in memory.

      Click here


      Body Electrical > SRS Airbag > Clear DTCs

    5. Turn the power switch off.

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

    7. Check for DTCs.

      Click here


      Body Electrical > SRS Airbag > Trouble Codes
      Result
      Result Proceed to
      DTC B1633/81 is output A
      DTC B1638/82 is output B
      DTC B1633/81 and B1638/82 are not output C

      Tech Tips

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

    8. Turn the power switch off.

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

    10. Return the side airbag sensor assembly LH and RH to their original positions and connect the connectors.


    A

    REPLACE AIRBAG SENSOR ASSEMBLY Click here

    B

    REPLACE SIDE AIRBAG SENSOR ASSEMBLY RH Click here

    C

    USE SIMULATION METHOD TO CHECK Click here