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 side airbag sensor assembly LH or RH.

The side airbag sensor assembly 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
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 side airbag sensor assembly RH malfunction.

  • An airbag ECU assembly malfunction.

  • Floor wire

  • Front door wire RH

  • Side airbag sensor assembly RH

  • Airbag ECU assembly
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 side airbag sensor assembly LH malfunction.

  • An airbag ECU assembly malfunction.

  • No. 2 floor wire

  • Front door wire LH

  • Side airbag sensor assembly LH

  • Airbag ECU assembly

WIRING DIAGRAM

B002IWLE10
*a Airbag ECU Assembly
*b Side Airbag Sensor Assembly RH
*c Door Side Airbag Sensor RH
B002IWLE13
*a Airbag ECU Assembly
*b Side Airbag Sensor Assembly 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

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

    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

    GO TO DTC B1632/81 Click here

    DTC B1637/82 is output

    GO TO DTC B1632/81 Click here

    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

    CHECK CONNECTION OF CONNECTORS Click here

    DTC B1633/81 and B1638/82 are not output

    USE SIMULATION METHOD TO CHECK Click here

    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 side airbag sensor assembly RH.

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

    The connectors are not properly connected

    CONNECT CONNECTORS PROPERLY

    The connectors are properly connected

  4. CHECK CONNECTORS


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

    2. B002K4FC22
      *1 Side Airbag Sensor Assembly RH
      *2 Airbag ECU Assembly
      *3 Floor Wire

      Check that the connectors (on the airbag ECU assembly side and side airbag sensor assembly 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

    REPLACE FLOOR WIRE

    The connectors are not deformed or damaged

  5. CHECK FLOOR WIRE


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

      B002K0DC07
      *1 Side Airbag Sensor Assembly RH *2 Airbag ECU Assembly
      *3 Floor Wire *4 Connector C
      *5 Connector B *6 Service Wire
      *a

      Front view of wire harness connector

      (to Side Airbag Sensor Assembly RH)

      		 *b

      Rear view of wire harness connector

      (to Airbag ECU Assembly)

    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
      P7-4 (BCR+) - Body ground Power switch on (IG) Below 1 V
      P7-3 (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 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
      P7-4 (BCR+) - P7-3 (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
      P7-4 (BCR+) - P7-3 (BCR-) Always 1 MΩ or higher
      P7-4 (BCR+) - Body ground Always 1 MΩ or higher
      P7-3 (BCR-) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FLOOR WIRE

    OK

  6. CHECK SIDE AIRBAG SENSOR ASSEMBLY RH


    1. B002HDBC34
      *1 Side Airbag Sensor Assembly LH
      *2 Airbag ECU Assembly

      Connect the connector to the airbag ECU assembly.

    2. Interchange the side airbag sensor assembly 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 side airbag sensor assembly LH and RH to their original positions and connect the connectors to them.


    DTC B1638/82 is output

    REPLACE SIDE AIRBAG SENSOR ASSEMBLY RH Click here

    DTC B1633/81 and B1638/82 are not output

    USE SIMULATION METHOD TO CHECK Click here

    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

    CONNECT CONNECTOR PROPERLY

    The connector is properly connected

  8. CHECK CONNECTORS


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

    2. B002IN4C09
      *1 Door Side Airbag Sensor RH
      *2 Side Airbag Sensor Assembly 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

    REPLACE HARNESS AND CONNECTOR

    The connector is not deformed or damaged

  9. CHECK DOOR SIDE AIRBAG SENSOR RH CIRCUIT


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

      B002IBUC04
      *1 Door Side Airbag Sensor RH *2 Side Airbag Sensor Assembly RH
      *3 Front Door Wire RH *4 Floor Wire
      *5 Connector E *6 Connector B
      *7 Service Wire - -
      *a

      Front view of wire harness connector

      (to Door Side Airbag Sensor RH)

      		 *b

      Front view of wire harness connector

      (to Side Airbag Sensor Assembly RH)

    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
      P7-1 (BDR+) - Body ground Power switch on (IG) Below 1 V
      P7-2 (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 2 (BDR+) and 1 (BDR-) of connector E.

      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
      P7-1 (BDR+) - P7-2 (BDR-) Always Below 1 Ω

    8. Disconnect the service wire from connector E.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P7-1 (BDR+) - P7-2 (BDR-) Always 1 MΩ or higher
      P7-1 (BDR+) - Body ground Always 1 MΩ or higher
      P7-2 (BDR-) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE AIRBAG ECU ASSEMBLY Click here

    NG

  10. CHECK FLOOR WIRE


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

      B002KVLC04
      *1 Door Side Airbag Sensor RH *2 Side Airbag Sensor Assembly RH
      *3 Front Door Wire RH *4 Floor Wire
      *5 Connector C *6 Connector B
      *7 Service Wire - -
      *a

      Front view of wire harness connector

      (to Front Door Wire RH)

      		 *b

      Front view of wire harness connector

      (to Side Airbag Sensor Assembly 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
      P7-1 (BDR+) - Body ground Power switch on (IG) Below 1 V
      P7-2 (BDR-) - 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 2 (BDR+) and 1 (BDR-) of connector C.

      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
      P7-1 (BDR+) - P7-2 (BDR-) Always Below 1 Ω

    9. Disconnect the service wire from connector C.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P7-1 (BDR+) - P7-2 (BDR-) Always 1 MΩ or higher
      P7-1 (BDR+) - Body ground Always 1 MΩ or higher
      P7-2 (BDR-) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE FRONT DOOR WIRE RH

    NG

    REPLACE FLOOR WIRE

  11. 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 side airbag sensor assembly LH.

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

    The connectors are not properly connected

    CONNECT CONNECTORS PROPERLY

    The connectors are properly connected

  12. CHECK CONNECTORS


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

    2. B002HI6C06
      *1 Side Airbag Sensor Assembly LH
      *2 Airbag ECU Assembly
      *3 No. 2 Floor Wire

      Check that the connectors (on the airbag ECU assembly side and side airbag sensor assembly 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

    REPLACE NO. 2 FLOOR WIRE

    The connectors are not deformed or damaged

  13. CHECK NO. 2 FLOOR WIRE


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

      B002H7RC04
      *1 Side Airbag Sensor Assembly LH *2 Airbag ECU Assembly
      *3 No. 2 Floor Wire *4 Connector C
      *5 Connector B *6 Service Wire
      *a

      Front view of wire harness connector

      (to Side Airbag Sensor Assembly LH)

      		 *b

      Rear view of wire harness connector

      (to Airbag ECU Assembly)

    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
      Q7-4 (BCL+) - Body ground Power switch on (IG) Below 1 V
      Q7-3 (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 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
      Q7-4 (BCL+) - Q7-3 (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
      Q7-4 (BCL+) - Q7-3 (BCL-) Always 1 MΩ or higher
      Q7-4 (BCL+) - Body ground Always 1 MΩ or higher
      Q7-3 (BCL-) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  14. CHECK SIDE AIRBAG SENSOR ASSEMBLY LH


    1. B002J0OC32
      *1 Side Airbag Sensor Assembly RH
      *2 Airbag ECU Assembly

      Connect the connector to the airbag ECU assembly.

    2. Interchange the side airbag sensor assembly 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 side airbag sensor assembly RH and LH to their original positions and connect the connectors to them.


    DTC B1633/81 is output

    REPLACE SIDE AIRBAG SENSOR ASSEMBLY LH Click here

    DTC B1633/81 and B1638/82 are not output

    USE SIMULATION METHOD TO CHECK Click here

    DTC B1638/82 is output

  15. 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

    CONNECT CONNECTOR PROPERLY

    The connector is properly connected

  16. CHECK CONNECTORS


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

    2. B002IN4C10
      *1 Door Side Airbag Sensor LH
      *2 Side Airbag Sensor Assembly LH
      *3 Front Door Wire LH
      *4 No. 2 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

    REPLACE HARNESS AND CONNECTOR

    The connector is not deformed or damaged

  17. CHECK DOOR SIDE AIRBAG SENSOR LH CIRCUIT


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

      B002IBUC05
      *1 Door Side Airbag Sensor LH *2 Side Airbag Sensor Assembly LH
      *3 Front Door Wire LH *4 No. 2 Floor Wire
      *5 Connector E *6 Connector B
      *7 Service Wire - -
      *a

      Front view of wire harness connector

      (to Door Side Airbag Sensor LH)

      		 *b

      Front view of wire harness connector

      (to Side Airbag Sensor Assembly LH)

    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
      Q7-1 (BDL+) - Body ground Power switch on (IG) Below 1 V
      Q7-2 (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 2 (BDL+) and 1 (BDL-) of connector E.

      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
      Q7-1 (BDL+) - Q7-2 (BDL-) Always Below 1 Ω

    8. Disconnect the service wire from connector E.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Q7-1 (BDL+) - Q7-2 (BDL-) Always 1 MΩ or higher
      Q7-1 (BDL+) - Body ground Always 1 MΩ or higher
      Q7-2 (BDL-) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE AIRBAG ECU ASSEMBLY Click here

    NG

  18. CHECK NO. 2 FLOOR WIRE


    1. Disconnect the No. 2 floor wire connector from the front door wire LH.

      B002KVLC05
      *1 Door Side Airbag Sensor LH *2 Side Airbag Sensor Assembly LH
      *3 Front Door Wire LH *4 No. 2 Floor Wire
      *5 Connector C *6 Connector B
      *7 Service Wire - -
      *a

      Front view of wire harness connector

      (to Front Door Wire LH)

      		 *b

      Front view of wire harness connector

      (to Side Airbag Sensor Assembly 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
      Q7-1 (BDL+) - Body ground Power switch on (IG) Below 1 V
      Q7-2 (BDL-) - 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 (BDL+) and 2 (BDL-) of connector C.

      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
      Q7-1 (BDL+) - Q7-2 (BDL-) Always Below 1 Ω

    9. Disconnect the service wire from connector C.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Q7-1 (BDL+) - Q7-2 (BDL-) Always 1 MΩ or higher
      Q7-1 (BDL+) - Body ground Always 1 MΩ or higher
      Q7-2 (BDL-) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE FRONT DOOR WIRE LH

    NG

    REPLACE NO. 2 FLOOR WIRE