AIRBAG SYSTEM, Diagnostic DTC:B1647/82, B1648/82

DTC Code DTC Name
B1647/82 Lost Communication with Side Satellite Sensor Bus LH
B1648/82 Side Satellite Sensor Bus LH Initialization Incomplete

DESCRIPTION

Each of the side airbag sensor assembly LH, rear airbag sensor LH and door side airbag sensor LH 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 DTCs B1647/82 and/or B1648/82.

DTC No. Detection Item DTC Detection Condition Trouble Area Test Mode / Check Mode
B1647/82 Lost Communication with Side Satellite Sensor Bus LH

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

  • Side airbag sensor assembly LH malfunction

  • Rear airbag sensor LH malfunction

  • Door side airbag sensor LH malfunction

  • Airbag sensor assembly malfunction

  • Floor wire

  • Front door wire LH

  • Side airbag sensor assembly LH

  • Rear airbag sensor LH

  • Door side airbag sensor LH

  • Airbag sensor assembly

 Does not apply to test/check mode
B1648/82 Side Satellite Sensor Bus LH Initialization Incomplete

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

  • Side airbag sensor assembly LH malfunction

  • Rear airbag sensor LH malfunction

  • Door side airbag sensor LH malfunction

  • Airbag sensor assembly malfunction

  • Floor wire

  • Front door wire LH

  • Side airbag sensor assembly LH

  • Rear airbag sensor LH

  • Door side airbag sensor LH

  • Airbag sensor assembly

 Does not apply to test/check mode

WIRING DIAGRAM

A01MHQWE08
*a Side Airbag Sensor Assembly LH
*b Door Side Airbag Sensor LH
*c Rear Side Airbag Sensor LH
*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 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 B1647/82 or B1648/82 is output A
      DTC B1647/82 or B1648/82 is not output B

      Tech Tips

      Codes other than DTC B1647/82 and B1648/82 may be output at this time, but they are not related to this check.


    B

    USE SIMULATION METHOD TO CHECK Click here

    A

  2. 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 sensor assembly and side airbag sensor assembly LH.

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

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  3. CHECK CONNECTORS


    1. A01MHJ9C01
      *1 Side Airbag Sensor Assembly LH
      *2 Airbag Sensor Assembly
      *3 Floor Wire

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

    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 FLOOR WIRE NO.2

    OK

  4. CHECK SIDE AIRBAG SENSOR ASSEMBLY LH CIRCUIT


    1. A01MHN5C01
      *1 Side Airbag Sensor Assembly LH
      *2 Airbag Sensor Assembly
      *3 Floor Wire
      *a

      Front view of wire harness connector

      (to Side airbag sensor assembly LH)
      *b

      Rear view of wire harness connectorear

      (to Airbag Sensor Assembly)
      *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 Condition Specified Condition
      P3-4 (BBL+) - Body ground Power switch on (IG) Below 1 V
      P3-3 (BBL-) - 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 (BBL+) - 23 (BBL-) 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
      P3-4 (BBL+) - P3-3 (BBL-) 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
      P3-4 (BBL+) - P3-3 (BBL-) 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
      P3-4 (BBL+) - Body ground Always 1 MΩ or higher
      P3-3 (BBL-) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FLOOR WIRE

    OK

  5. CHECK SIDE AIR BAG SENSOR ASSEMBLY LH


    1. A01MGM2C01
      *1 Side Airbag Sensor Assembly RH
      *2 Airbag Sensor Assembly

      Connect the connector to airbag sensor assembly.

    2. Interchange the side airbag sensor assembly 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 B1642/81 or B1643/81 is output A
      DTC B1647/82 or B1648/82 is output B
      DTC B1642/81, B1643/81, B1647/82 and B1648/82 are not output C

      Tech Tips

      Codes other than DTCs B1642/81, B1643/81, B1647/82 and B1648/82 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 LH to their original positions and connect the connectors.


    A

    REPLACE SIDE AIRBAG SENSOR ASSEMBLY LH Click here

    C

    USE SIMULATION METHOD TO CHECK Click here

    B

  6. CHECK CONNECTION OF CONNECTORS


    1. Check that the connectors are properly connected to the rear airbag sensor assembly LH.

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

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  7. CHECK CONNECTORS


    1. A01MIJ9C01
      *1 Rear Airbag Sensor LH
      *2 Side Airbag Sensor Assembly LH
      *3 Floor Wire

      Disconnect the connectors from the side airbag sensor assembly LH and rear airbag sensor LH

    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 FLOOR WIRE

    OK

  8. CHECK REAR AIRBAG SENSOR LH CIRCUIT


    1. A01MI5KC02
      *1 Rear Airbag Sensor LH
      *2 Side Airbag Sensor Assembly LH
      *3 Floor Wire
      *a

      Front view of wire harness connector

      (to Rear Airbag Sensor LH)
      *b

      Front view of wire harness connectorear

      (to Side Airbag Sensor Assembly LH)
      *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 Condition Specified Condition
      P5-4 (BCL+) - Body ground Power switch on (IG) Below 1 V
      P5-3 (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 1 (BCL+) - 2 (BCL-) 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
      P5-4 (BCL+) - P5-3 (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
      P5-4 (BCL+) - Body ground 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
      P5-4 (BCL+) - Body ground Always 1 MΩ or higher
      P5-3 (BCL-) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FLOOR WIRE

    OK

  9. CHECK REAR AIRBAG SENSOR LH


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

      Connect the connector to side airbag sensor assembly LH.

    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 B1642/81 or B1643/81 is output A
      DTC B1647/82 or B1648/82 is output B
      DTC B1642/81, B1643/81, B1647/82 and B1648/82 are not output C

      Tech Tips

      Codes other than DTCs B1642/81, B1643/81, B1647/82 and B1648/82 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.


    A

    REPLACE REAR AIRBAG SENSOR LH Click here

    C

    USE SIMULATION METHOD TO CHECK Click here

    B

  10. CHECK CONNECTION OF CONNECTORS


    1. Check that the connectors are properly connected to the door side airbag sensor assembly LH.

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

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  11. CHECK CONNECTORS


    1. A01MJLRC01
      *1 Door Side Airbag Sensor LH
      *2 Rear Airbag Sensor LH
      *3 Front Door Wire LH
      *4 Floor Wire

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

    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 FRONT DOOR WIRE LH

    OK

  12. CHECK DOOR SIDE AIRBAG SENSOR LH CIRCUIT


    1. A01MJW4C02
      *1 Door Side Airbag Sensor LH
      *2 Rear Airbag Sensor LH
      *3 Front Door Wire LH
      *a

      Front view of wire harness connector

      (to Door Side Airbag Sensor LH)
      *b

      Front view of wire harness connectorear

      (to Rear Airbag Sensor LH)
      *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 Condition Specified Condition
      L16-2 (BDL+) - Body ground Power switch on (IG) Below 1 V
      L16-1 (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 (BDL+) - 2 (BDL-) 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
      L16-2 (BDL+) -L16-1 (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
      L16-2 (BDL+) -L16-1 (BDL-) 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
      L16-2 (BDL+) - Body ground Always 1 MΩ or higher
      L16-1 (BDL-) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    CHECK FLOOR WIRE Click here

    OK

  13. CHECK DOOR SIDE AIR BAG SENSOR LH


    1. A01MFZQC01
      *1 Door Side Airbag Sensor RH
      *2 Rear Airbag Sensor LH

      Connect the connector to rear airbag sensor LH.

    2. Interchange the door side 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 B1642/81 or B1643/81 is output A
      DTC B1647/82 or B1648/82 is output B
      DTC B1642/81, B1643/81, B1647/82 and B1648/82 are not output C

      Tech Tips

      Codes other than DTCs B1642/81, B1643/81, B1647/82 and B1648/82 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 door airbag sensor RH and LH to their original positions and connect the connectors.


    A

    REPLACE DOOR SIDE AIR BAG SENSOR LH Click here

    B

    REPLACE AIRBAG SENSOR ASSEMBLY Click here

    C

    USE SIMULATION METHOD TO CHECK Click here

  14. CHECK FLOOR WIRE


    1. A01MHWIC02
      *1 Door Side Airbag Sensor LH
      *2 Rear Airbag Sensor LH
      *3 Front Door Wire LH
      *4 Floor Wire
      *a

      Front view of wire harness connector

      (to Door Side Airbag Sensor LH)
      *b

      Front view of wire harness connectorear

      (to Rear Airbag Sensor LH)
      *c Service Wire

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

    2. Disconnect the cable from 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 Condition Specified Condition
      LP1-1 (BDL+) - Body ground Power switch on (IG) Below 1 V
      LP1-2 (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+) - 2 (BDL-) of connector B.

      Note

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      LP1-1 (BDL+) -LP1-2 (BDL-) 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
      LP1-1 (BDL+) - LP1-2 (BDL-) Always 1 MΩ or higher

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      LP1-1 (BDL+) - Body ground Always 1 MΩ or higher
      LP1-2 (BDL-) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE FRONT DOOR WIRE LH

    NG

    REPLACE FLOOR WIRE