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Home >> Lexus >> 2011 >> LX 570 >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Airbag System (Diagnostic Codes (B1000/31 - B1662/45)) >> Airbag System >> DTC B1642/81: Lost Communication with Side Satellite Sensor Bus RH; DTC B1647/82: Lost Communication with Side Satellite Sensor Bus LH (08/2010 - 08/2011) >> Procedure

DTC B1642/81: Lost Communication with Side Satellite Sensor Bus RH; DTC B1647/82: Lost Communication with Side Satellite Sensor Bus LH (08/2010 - 08/2011): Procedure

  1. CHECK FOR DTC 
    1. Turn the engine switch off.
    2. Turn the engine switch on (IG), and wait for at least 60 seconds.
    3. Check for DTCs. Refer to DTC CHECK / CLEAR .
      RESULT

      Result Proceed to
      DTC B1642 and B1647 are not output A
      DTC B1647 is output B
      DTC B1642 is output C

      HINT: 

      Codes other than DTC B1642 and B1647 may be output at this time, but they are not related to this check.

    A → See step   21 

    B → See step   12 

    C: Go to next step 

  2. 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 and side airbag sensor RH.

      OK

      The connectors are properly connected.

    NG → CONNECT CONNECTORS PROPERLY 

    OK: Go to next step 

  3. CHECK CONNECTORS 
    1. Disconnect the connectors from the center airbag sensor and side airbag sensor RH.
    2. Check that the connectors (on the center airbag sensor side and side airbag sensor RH side) are not damaged.

      OK

      The connectors are not deformed or damaged.

    NG → REPLACE HARNESS AND CONNECTOR 

    OK: Go to next step 

  4. CHECK SIDE AIRBAG SENSOR RH CIRCUIT 
    Fig 1: Identifying I9 Side Airbag Sensor (RH) & Center Air Bag Sensor Connector Terminal L27
    GTY109278Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      I9-4 (BBR+) - Body ground Engine switch on (IG) Below 1 V
      I9-3 (BBR-) - Body ground Engine switch on (IG) Below 1 V
    3. Turn the engine switch off.
    4. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    5. Using a service wire, connect terminals 17 (BBR+) and 18 (BBR-) of connector B.
      NOTE:

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

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      I9-4 (BBR+) - I9-3 (BBR-) Always Below 1 Ω
    7. Disconnect the service wire from connector B.
    8. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I9-4 (BBR+) - I9-3 (BBR-) Always 1 MΩ or higher
      I9-4 (BBR+) - Body ground Always 1 MΩ or higher
      I9-3 (BBR-) - Body ground Always 1 MΩ or higher

    NG → See step   10 

    OK: Go to next step 

  5. CHECK CONNECTION OF CONNECTORS 
    1. Check that the connector is properly connected to the rear airbag sensor RH.

      OK

      The connector is properly connected.

    NG → CONNECT CONNECTOR PROPERLY 

    OK: Go to next step 

  6. CHECK CONNECTORS 
    1. Disconnect the connectors from the side airbag sensor RH and rear airbag sensor RH.
    2. Check that the connector (on the rear airbag sensor RH side) is not damaged.

      OK

      The connector is not deformed or damaged.

    NG → REPLACE HARNESS AND CONNECTOR 

    OK: Go to next step 

  7. CHECK REAR AIRBAG SENSOR RH CIRCUIT 
    Fig 2: Identifying Rear Airbag Sensor RH Connector Terminal L18 And Side Airbag Sensor RH Connector Terminal I9
    GTY360435Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      I9-1 (BCR+) - Body ground Engine switch on (IG) Below 1 V
      I9-2 (BCR-) - Body ground Engine switch on (IG) Below 1 V
    3. Turn the engine switch off.
    4. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    5. Using a service wire, connect terminals 2 (BCR+) and 1 (BCR-) of connector E.
      NOTE:

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

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      I9-1 (BCR+) - I9-2 (BCR-) Always Below 1 Ω
    7. Disconnect the service wire from connector E.
    8. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I9-1 (BCR+) - I9-2 (BCR-) Always 1 MΩ or higher
      I9-1 (BCR+) - Body ground Always 1 MΩ or higher
      I9-2 (BCR-) - Body ground Always 1 MΩ or higher

    NG → See step   11 

    OK: Go to next step 

  8. CHECK SIDE AIRBAG SENSOR RH 
    Fig 3: Identifying Side Airbag Sensor LH And Center Airbag Sensor Circuit
    GTY215131Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Connect the connector to the center airbag sensor.
    2. Interchange the side 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 the memory. Refer to DTC CHECK / CLEAR .
    6. Turn the engine switch off.
    7. Turn the engine switch on (IG), and wait for at least 90 seconds.
    8. Check for DTCs. Refer to DTC CHECK / CLEAR .
      RESULT

      Result Proceed to
      DTC B1642 and B1647 are not output A
      DTC B1647 is output B
      DTC B1642 is output C

      HINT: 

      Codes other than DTC B1642 and B1647 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 side airbag sensor LH and RH to their original positions and connect the connectors to them.

    A → See step   22 

    B → See step   23 

    C: Go to next step 

  9. CHECK REAR AIRBAG SENSOR RH 
    Fig 4: Identifying Rear Airbag Sensor RH And Side Air Bag Sensor RH Circuit
    GTY358909Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Temporarily replace the rear airbag sensor RH with a new one.
    2. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
    3. Turn the engine switch on (IG), and wait for at least 60 seconds.
    4. Clear the DTCs stored in the memory. Refer to DTC CHECK / CLEAR .
    5. Turn the engine switch off.
    6. Turn the engine switch on (IG), and wait for at least 90 seconds.
    7. Check for DTCs. Refer to DTC CHECK / CLEAR .

      OK

      DTC B1642 is not output.

      HINT: 

      Codes other than DTC B1642 may be output at this time, but they are not related to this check.

    8. Turn the engine switch off.
    9. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

    NG → See step   24 

    OK → See step   25 

  10. CHECK NO. 2 FLOOR WIRE (CENTER AIRBAG SENSOR - FRONT DOOR WIRE RH) 
    Fig 5: Identifying Center Airbag Sensor & Front Door Wire Connector Terminal (RH)
    GTY109279Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the No. 2 floor wire connector from the front door wire RH.
    2. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      IL1-4 (BBR+) - Body ground Engine switch on (IG) Below 1 V
      IL1-3 (BBR-) - 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 (BBR+) and 18 (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
      IL1-4 (BBR+) - IL1-3 (BBR-) 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
      IL1-4 (BBR+) - IL1-3 (BBR-) Always 1 MΩ or higher
      IL1-4 (BBR+) - Body ground Always 1 MΩ or higher
      IL1-3 (BBR-) - Body ground Always 1 MΩ or higher

    NG → REPLACE NO. 2 FLOOR WIRE 

    OK → REPLACE FRONT DOOR WIRE RH 

  11. CHECK FRONT DOOR WIRE RH (SIDE AIRBAG SENSOR RH - NO. 2 FLOOR WIRE) 
    Fig 6: Identifying Side Airbag Sensor (RH) Connector Terminal I9
    GTY109553Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the front door wire RH connector from the No. 2 floor wire.
    2. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      I9-1 (BCR+) - Body ground Engine switch on (IG) Below 1 V
      I9-2 (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 2 (BCR+) and 1 (BCR-) of connector C.
      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
      I9-1 (BCR+) - I9-2 (BCR-) Always Below 1 Ω
    8. Disconnect the service wire from connector C.
    9. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I9-1 (BCR+) - I9-2 (BCR-) Always 1 MΩ or higher
      I9-1 (BCR+) - Body ground Always 1 MΩ or higher
      I9-2 (BCR-) - Body ground Always 1 MΩ or higher

    NG → REPLACE FRONT DOOR WIRE RH 

    OK → REPLACE NO. 2 FLOOR WIRE 

  12. 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 and rear airbag sensor LH.

      OK

      The connectors are properly connected.

    NG → CONNECT CONNECTORS PROPERLY 

    OK: Go to next step 

  13. CHECK CONNECTORS 
    1. Disconnect the connectors from the center airbag sensor and rear airbag sensor LH.
    2. Check that the connectors (on the center airbag sensor side and rear airbag sensor LH side) are not damaged.

      OK

      The connectors are not deformed or damaged.

    NG → REPLACE FLOOR WIRE 

    OK: Go to next step 

  14. CHECK FLOOR WIRE (CENTER AIRBAG SENSOR - REAR AIRBAG SENSOR LH) 
    Fig 7: Identifying Center Airbag Sensor K27 & Rear Airbag Sensor Connector Terminal K7
    GTY360498Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      K7-4 (BBL+) - Body ground Engine switch on (IG) Below 1 V
      K7-3 (BBL-) - Body ground Engine switch on (IG) Below 1 V
    3. Turn the engine switch off.
    4. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    5. Using a service wire, connect terminals 24 (BBL+) and 23 (BBL-) of connector B.
      NOTE:

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

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      K7-4 (BBL+) - K7-3 (BBL-) Always Below 1 Ω
    7. Disconnect the service wire from connector B.
    8. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      K7-4 (BBL+) - K7-3 (BBL-) Always 1 MΩ or higher
      K7-4 (BBL+) - Body ground Always 1 MΩ or higher
      K7-3 (BBL-) - Body ground Always 1 MΩ or higher

    NG → REPLACE FLOOR WIRE 

    OK: Go to next step 

  15. CHECK CONNECTION OF CONNECTOR 
    1. Check that the connector is properly connected to the side airbag sensor LH.

      OK

      The connector is properly connected.

    NG → CONNECT CONNECTORS PROPERLY 

    OK: Go to next step 

  16. CHECK CONNECTORS 
    1. Disconnect the connectors from the rear airbag sensor LH and side airbag sensor LH.
    2. Check that the connector (on the side airbag sensor LH side) is not damaged.

      OK

      The connector is not deformed or damaged.

    NG → REPLACE HARNESS AND CONNECTOR 

    OK: Go to next step 

  17. CHECK SIDE AIRBAG SENSOR LH CIRCUIT 
    Fig 8: Identifying Side Airbag Sensor IL1 & Rear Airbag Sensor K7 Connector Terminal
    GTY360147Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      K7-1 (BCL+) - Body ground Engine switch on (IG) Below 1 V
      K7-2 (BCL-) - Body ground Engine switch on (IG) Below 1 V
    3. Turn the engine switch off.
    4. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    5. Using a service wire, connect terminals 2 (BCL+) and 1 (BCL-) of connector E.
      NOTE:

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

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      K7-1 (BCL+) - K7-2 (BCL-) Always Below 1 Ω
    7. Disconnect the service wire from connector E.
    8. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      K7-1 (BCL+) - K7-2 (BCL-) Always 1 MΩ or higher
      K7-1 (BCL+) - Body ground Always 1 MΩ or higher
      K7-2 (BCL-) - Body ground Always 1 MΩ or higher

    NG → See step   20 

    OK: Go to next step 

  18. CHECK REAR AIRBAG SENSOR LH 
    Fig 9: Identifying Rear Airbag Sensor LH And Center Airbag Sensor Circuit
    GTY111269Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Connect the connectors to the center airbag sensor.
    2. Temporarily replace the side airbag sensor LH with a new one.
    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 the memory. Refer to DTC CHECK / CLEAR .
    6. Turn the engine switch off.
    7. Turn the engine switch on (IG), and wait for at least 90 seconds.
    8. Check for DTCs. Refer to DTC CHECK / CLEAR .

      OK

      DTC B1642 or B1647 is not output.

      HINT: 

      Codes other than DTC B1642 and B1647 may be output at this time, but they are not related to this check.

    NG → See step   19 

    OK → See step   26 

  19. CHECK SIDE AIRBAG SENSOR LH 
    Fig 10: Identifying Side Airbag Sensor RH And Rear Airbag Sensor LH Circuit
    GTY355083Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Turn the engine switch off.
    2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    3. Interchange the side airbag sensor RH with LH and connect the connectors to them.
    4. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
    5. Turn the engine switch on (IG), and wait for at least 60 seconds.
    6. Clear the DTCs stored in the memory. Refer to DTC CHECK / CLEAR .
    7. Turn the engine switch off.
    8. Turn the engine switch on (IG), and wait for at least 90 seconds.
    9. Check for DTCs. Refer to DTC CHECK / CLEAR .
      RESULT

      Result Proceed to
      DTC B1647 is output A
      DTC B1642 is output B
      DTC B1642 and B1647 are not output C

      HINT: 

      Codes other than DTC B1642 and B1647 may be output at this time, but they are not related to this check.

    10. Turn the engine switch off.
    11. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    12. Return the rear airbag sensor RH and LH to their original positions and connect the connectors to them.

    A → See step   27 

    B → See step   28 

    C → See step   29 

  20. CHECK FLOOR WIRE (REAR SIDE AIRBAG SENSOR LH - FRONT DOOR WIRE LH) 
    Fig 11: Identifying Front Door Wire LH Connector Terminal IK1 And Rear Side Airbag Sensor LH Connector Terminal K7
    GTY359873Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the floor wire connector from the front door wire LH.
    2. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      K7-1 (BCL+) - Body ground Engine switch on (IG) Below 1 V
      K7-2 (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 2 (BCL+) and 1 (BCL-) of connector C.
      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
      K7-1 (BCL+) - K7-2 (BCL-) Always Below 1 Ω
    8. Disconnect the service wire from connector C.
    9. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      K7-1 (BCL+) - K7-2 (BCL-) Always 1 MΩ or higher
      K7-1 (BCL+) - Body ground Always 1 MΩ or higher
      K7-2 (BCL-) - Body ground Always 1 MΩ or higher

    NG → REPLACE FLOOR WIRE 

    OK → REPLACE FRONT DOOR WIRE LH 

  21. USE SIMULATION METHOD TO CHECK. Refer to  DIAGNOSIS SYSTEM 
  22. USE SIMULATION METHOD TO CHECK. Refer to  DIAGNOSIS SYSTEM 
  23. REPLACE SIDE AIRBAG SENSOR ASSEMBLY RH. Refer to  REMOVAL 
  24. REPLACE CENTER AIRBAG SENSOR ASSEMBLY. Refer to  REMOVAL 
  25. REPLACE REAR AIRBAG SENSOR RH. Refer to  REMOVAL 
  26. REPLACE REAR AIRBAG SENSOR LH. Refer to  REMOVAL 
  27. REPLACE CENTER AIRBAG SENSOR ASSEMBLY. Refer to  REMOVAL 
  28. REPLACE SIDE AIRBAG SENSOR LH. Refer to  REMOVAL 
  29. USE SIMULATION METHOD TO CHECK. Refer to  DIAGNOSIS SYSTEM 
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