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 is composed of the airbag ECU assembly, door side airbag sensor 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 airbag ECU 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 side collision sensor LH or RH.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Test Mode / Check Mode
B1633/81 Rear Airbag Sensor Assembly RH Initialization Incomplete

One of the following conditions is met:


  • The airbag ECU 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 side collision sensor RH for 2 seconds.

  • A rear airbag sensor RH malfunction.

  • An airbag ECU assembly malfunction.


  • Floor wire

  • Front door wire RH

  • Rear airbag sensor RH

  • Airbag ECU assembly

Comes on Not applicable
B1638/82 Rear Airbag Sensor Assembly LH Initialization Incomplete

One of the following conditions is met:


  • The airbag ECU 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 side collision sensor LH for 2 seconds.

  • A rear airbag sensor LH malfunction.

  • An airbag ECU assembly malfunction.


  • Floor wire

  • Front door wire LH

  • Rear airbag sensor LH

  • Airbag ECU assembly

Comes on Not applicable

WIRING DIAGRAM

B004CE4E53
*a Airbag ECU Assembly
*b Rear Airbag Sensor RH
*c Door Side Airbag Sensor RH
B004CE4E55
*a Airbag ECU Assembly
*b Rear Airbag Sensor LH
*c Door Side Airbag Sensor LH

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

PROCEDURE


  1. CHECK PAST DTC


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

    2. Check for DTCs.

      Click here


      Body Electrical > SRS Airbag > Trouble Codes
      Result
      Proceed to
      DTC B1632/81 and B1637/82 are not output
      DTC B1632/81 is output
      DTC B1637/82 is output

    DTC B1632/81 is output
    DTC B1637/82 is output
    DTC B1632/81 and B1637/82 are not output
  2. CHECK DTC


    1. Turn the power 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 power switch off and then on (IG) again.

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

    3. Check for DTCs.

      Click here


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

      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.


    DTC B1638/82 is output
    DTC B1633/81 and B1638/82 are not output
    DTC B1633/81 is output
  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 airbag ECU assembly and rear airbag sensor RH.

      Result
      Proceed to
      The connectors are properly connected
      The connectors are not properly connected

    The connectors are not properly connected
    The connectors are properly connected
  4. CHECK CONNECTORS


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

    2. B004ALKC26
      *1 Rear Airbag Sensor RH
      *2 Airbag ECU Assembly
      *3 Floor Wire

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

      Result
      Proceed to
      The connectors are not deformed or damaged
      The connectors are deformed or damaged

    The connectors are deformed or damaged
    The connectors are not deformed or damaged
  5. CHECK FLOOR WIRE


    1. B004BAJC01
      *1 Rear Airbag Sensor RH
      *2 Airbag ECU Assembly
      *3 Floor Wire
      *4 Service Wire
      *a

      Front view of wire harness connector

      (to Rear Airbag Sensor RH)

      *b

      Front view of wire harness connector

      (to Airbag ECU Assembly)

      Connect the cable to 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
      X26-4 (BCR+) - Body ground Power switch on (IG) Below 1 V
      X26-3 (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 25 (BBR+) and 26 (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
      X26-4 (BCR+) - X26-3 (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
      X26-4 (BCR+) - X26-3 (BCR-) Always 1 MΩ or higher
      X26-4 (BCR+) - Body ground Always 1 MΩ or higher
      X26-3 (BCR-) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    NG
    OK
  6. CHECK REAR AIRBAG SENSOR RH


    1. B004CN0C31
      *1 Rear Airbag Sensor LH
      *2 Airbag ECU Assembly

      Connect the connectors to the airbag ECU assembly.

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

    3. Connect the cable to 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
      Proceed to
      DTC B1638/82 is output
      DTC B1633/81 is output
      DTC B1633/81 and B1638/82 are not output

      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 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 LH and RH to their original positions and connect the connectors to them.


    DTC B1638/82 is output
    DTC B1633/81 and B1638/82 are not output
    DTC B1633/81 is output
  7. CHECK CONNECTION OF CONNECTOR


    1. Check that the connector is properly connected to the door side airbag sensor RH.

      Result
      Proceed to
      The connector is properly connected
      The connector is not properly connected

    The connector is not properly connected
    The connector is properly connected
  8. CHECK CONNECTOR


    1. Disconnect the connectors from the door side airbag sensor RH and rear airbag sensor RH.

    2. B004BVCC09
      *1 Door Side Airbag Sensor RH
      *2 Rear Airbag Sensor RH
      *3 Front Door Wire RH
      *4 Floor Wire

      Check that the connector (on the door side airbag sensor RH side) is not damaged.

      Result
      Proceed to
      The connector is not deformed or damaged
      The connector is deformed or damaged

    The connector is deformed or damaged
    The connector is not deformed or damaged
  9. CHECK DOOR SIDE AIRBAG SENSOR RH CIRCUIT


    1. B004B5CC01
      *1 Door Side Airbag Sensor RH
      *2 Rear Airbag Sensor RH
      *3 Front Door Wire RH
      *4 Floor Wire
      *5 Service Wire
      *a

      Front view of wire harness connector

      (to Door Side Airbag Sensor RH)

      *b

      Front view of wire harness connector

      (to Rear Airbag Sensor RH)

      Connect the cable to 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
      R7-2 (BDR+) - Body ground Power switch on (IG) Below 1 V
      R7-1 (BDR-) - 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 (BBR+) and 2 (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
      R7-2 (BDR+) - R7-1 (BDR-) 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
      R7-2 (BDR+) - R7-1 (BDR-) Always 1 MΩ or higher
      R7-2 (BDR+) - Body ground Always 1 MΩ or higher
      R7-1 (BDR-) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    NG
    OK
  10. CHECK DTC


    1. B004AAYC15
      *1 Door Side Airbag Sensor RH
      *2 Rear Airbag Sensor RH

      Connect the connectors to the door side airbag sensor RH and rear airbag sensor RH.

    2. Connect the cable to 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.

      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
      Proceed to
      DTC B1633/81 is output
      DTC B1633/81 is not output

      Tech Tips

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


    DTC B1633/81 is output
    DTC B1633/81 is not output
  11. CHECK FLOOR WIRE


    1. B004BJTC03
      *1 Door Side Airbag Sensor RH
      *2 Rear Airbag Sensor RH
      *3 Front Door Wire RH
      *4 Floor Wire
      *5 Service Wire
      *a

      Front view of wire harness connector

      (to Front Door Wire RH)

      *b

      Front view of wire harness connector

      (to Rear Airbag Sensor RH)

      Disconnect the floor wire connector from the front door wire RH.

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

    3. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      RX1-30 (BBR+) - Body ground Power switch on (IG) Below 1 V
      RX1-48 (BBR-) - Body ground Power switch on (IG) Below 1 V
    5. Turn the power switch off.

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

    7. Using a service wire, connect terminals 1 (BBR+) and 2 (BBR-) of connector B.

      Note

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      RX1-30 (BBR+) - RX1-48 (BBR-) Always Below 1 Ω
    9. Disconnect the service wire from connector B.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      RX1-30 (BBR+) - RX1-48 (BBR-) Always 1 MΩ or higher
      RX1-30 (BBR+) - Body ground Always 1 MΩ or higher
      RX1-48 (BBR-) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    OK
    NG
  12. 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 airbag ECU assembly and rear airbag sensor LH.

      Result
      Proceed to
      The connectors are properly connected
      The connectors are not properly connected

    The connectors are not properly connected
    The connectors are properly connected
  13. CHECK CONNECTORS


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

    2. B004CFRC32
      *1 Rear Airbag Sensor LH
      *2 Airbag ECU Assembly
      *3 Floor Wire

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

      Result
      Proceed to
      The connectors are not deformed or damaged
      The connectors are deformed or damaged

    The connectors are deformed or damaged
    The connectors are not deformed or damaged
  14. CHECK FLOOR WIRE


    1. B004A3FC02
      *1 Rear Airbag Sensor LH
      *2 Airbag ECU Assembly
      *3 Floor Wire
      *4 Service Wire
      *a

      Front view of wire harness connector

      (to Rear Airbag Sensor LH)

      *b

      Front view of wire harness connector

      (to Airbag ECU Assembly)

      Connect the cable to 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
      X58-4 (BCL+) - Body ground Power switch on (IG) Below 1 V
      X58-3 (BCL-) - 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 32 (BBL+) and 31 (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
      X58-4 (BCL+) - X58-3 (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
      X58-4 (BCL+) - X58-3 (BCL-) Always 1 MΩ or higher
      X58-4 (BCL+) - Body ground Always 1 MΩ or higher
      X58-3 (BCL-) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    NG
    OK
  15. CHECK REAR AIRBAG SENSOR LH


    1. B004CILC01
      *1 Rear Airbag Sensor RH
      *2 Airbag ECU Assembly

      Connect the connectors to the airbag ECU assembly.

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

    3. Connect the cable to 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
      Proceed to
      DTC B1633/81 is output
      DTC B1638/82 is output
      DTC B1633/81 and B1638/82 are not output

      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 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 to them.


    DTC B1633/81 is output
    DTC B1633/81 and B1638/82 are not output
    DTC B1638/82 is output
  16. CHECK CONNECTION OF CONNECTOR


    1. Check that the connector is properly connected to the door side airbag sensor LH.

      Result
      Proceed to
      The connector is properly connected
      The connector is not properly connected

    The connector is not properly connected
    The connector is properly connected
  17. CHECK CONNECTOR


    1. Disconnect the connectors from the door side airbag sensor LH and rear airbag sensor LH.

    2. B004BVCC08
      *1 Door Side Airbag Sensor LH
      *2 Rear Airbag Sensor LH
      *3 Front Door Wire LH
      *4 Floor Wire

      Check that the connector (on the door side airbag sensor LH side) is not damaged.

      Result
      Proceed to
      The connector is not deformed or damaged
      The connector is deformed or damaged

    The connector is deformed or damaged
    The connector is not deformed or damaged
  18. CHECK DOOR SIDE AIRBAG SENSOR LH CIRCUIT


    1. B004B5CC02
      *1 Door Side Airbag Sensor LH
      *2 Rear Airbag Sensor LH
      *3 Front Door Wire LH
      *4 Floor Wire
      *5 Service Wire
      *a

      Front view of wire harness connector

      (to Door Side Airbag Sensor LH)

      *b

      Front view of wire harness connector

      (to Rear Airbag Sensor LH)

      Connect the cable to 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
      S7-2 (BDL+) - Body ground Power switch on (IG) Below 1 V
      S7-1 (BDL-) - 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 (BBL+) and 2 (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
      S7-2 (BDL+) - S7-1 (BDL-) 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
      S7-2 (BDL+) - S7-1 (BDL-) Always 1 MΩ or higher
      S7-2 (BDL+) - Body ground Always 1 MΩ or higher
      S7-1 (BDL-) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    NG
    OK
  19. CHECK DTC


    1. B004AAYC15
      *1 Door Side Airbag Sensor LH
      *2 Rear Airbag Sensor LH

      Connect the connectors to the door side airbag sensor LH and rear airbag sensor LH.

    2. Connect the cable to 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.

      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
      Proceed to
      DTC B1638/82 is output
      DTC B1638/82 is not output

      Tech Tips

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


    DTC B1638/82 is output
    DTC B1638/82 is not output
  20. CHECK FLOOR WIRE


    1. B004BJTC02
      *1 Door Side Airbag Sensor LH
      *2 Rear Airbag Sensor LH
      *3 Front Door Wire LH
      *4 Floor Wire
      *5 Service Wire
      *a

      Front view of wire harness connector

      (to Front Door Wire LH)

      *b

      Front view of wire harness connector

      (to Rear Airbag Sensor LH)

      Disconnect the floor wire connector from the front door wire LH.

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

    3. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      SX1-30 (BBL+) - Body ground Power switch on (IG) Below 1 V
      SX1-48 (BBL-) - Body ground Power switch on (IG) Below 1 V
    5. Turn the power switch off.

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

    7. Using a service wire, connect terminals 1 (BBL+) and 2 (BBL-) of connector B.

      Note

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      SX1-30 (BBL+) - SX1-48 (BBL-) Always Below 1 Ω
    9. Disconnect the service wire from connector B.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      SX1-30 (BBL+) - SX1-48 (BBL-) Always 1 MΩ or higher
      SX1-30 (BBL+) - Body ground Always 1 MΩ or higher
      SX1-48 (BBL-) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    OK
    NG