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Home >> Lexus >> 2007 >> LS 460L >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Supplemental Restraint System >> Airbag System >> DTC B1623/81 Side Airbag Sensor Assembly RH Initialization Incomplete; DTC B1628/82 Side Airbag Sensor Assembly LH Initialization Incomplete; DTC B1633/81 Rear Airbag Sensor Assembly RH Initialization Incomplete; DTC B1638/82 Rear Airbag Sensor Assembly LH Initialization Incomplete >> Inspection Procedure
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Inspection Procedure

NOTE: After the engine switch is turned off, the HDD navigation system requires approximately 6 minutes to record various types of memory and settings. As a result, after turning the engine switch off, wait 6 minutes or more before disconnecting the cable from the negative (-) battery terminal.
  1. CHECK PAST DTC 
    1. Turn the engine switch on (IG), and wait for at least 60 seconds.
    2. Turn the engine switch off.
    3. Turn the engine switch on (IG), and wait for at least 60 seconds.
    4. Check the past DTCs (see DTC CHECK / CLEAR  ).

      Result: 

      RESULT CHART

      Result Proceed to
      DTC B1622 or B1627 is output A
      DTC B1632 or B1637 is output B
      DTC B1622, B1627, B1632 and B1637 are not output C

    A: GO TO  DTC B1622   (See ) 

    B: GO TO  DTC B1632   (See ) 

    C: GO TO NEXT STEP 

  2. CHECK FOR DTC 
    1. Turn the engine switch off.

      HINT:

      If a communication error occurs, DTCs for both the LH and RH sides will be stored simultaneously. To identify the malfunctioning area, turn the engine switch off and then on (IG) again.

    2. Turn the engine switch on (IG), and wait for at least 60 seconds.
    3. Check for DTCs (see DTC CHECK / CLEAR  ).

      Result: 

      RESULT CHART

      Result Proceed to
      DTC B1623, B1628, B1633 and B1638 are not output A
      DTC B1628 or B1638 is output B
      DTC B1623 or B1633 is output C

    A: USE SIMULATION METHOD TO CHECK (See  DIAGNOSIS SYSTEM   ) 

    B: Go to step   11 

    C: GO TO NEXT STEP 

  3. CHECK CONNECTION OF CONNECTORS 
    1. Turn the engine switch off.
    2. Disconnect the negative (-) terminal cable from the battery, 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 

  4. 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 FLOOR WIRE 

    OK: GO TO NEXT STEP 

  5. CHECK FLOOR WIRE (CENTER AIRBAG SENSOR - SIDE AIRBAG SENSOR RH) 
    Fig 1: Identifying Center Airbag Sensor And Side Airbag Sensor RH Connector Terminal
    G04951000Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
    2. Turn the engine switch on (IG).
    3. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Switch Condition Specified Condition
      R7-4 (BBR+) - Body ground Engine switch on (IG) Below 1 V
      R7-3 (BBR-) - Body ground Engine switch on (IG) Below 1 V
    4. Turn the engine switch off.
    5. Disconnect the negative (-) terminal cable from the battery, 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 a 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 SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      R7-4 (BBR+) - R7-3 (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 SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      R7-4 (BBR+) - R7-3 (BBR-) Always 1 MΩ or higher
      R7-4 (BBR+) - Body ground Always 1 MΩ or higher
      R7-3 (BBR-) - Body ground Always 1 MΩ or higher

    NG: REPLACE FLOOR WIRE 

    OK: GO TO NEXT STEP 

  6. 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 

  7. 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 FLOOR WIRE 

    OK: GO TO NEXT STEP 

  8. CHECK FLOOR WIRE (SIDE AIRBAG SENSOR RH - REAR AIRBAG SENSOR RH) 
    Fig 2: Identifying Side Airbag Sensor RH And Rear Airbag Sensor RH Connector Terminal
    G04951001Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
    2. Turn the engine switch on (IG).
    3. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Switch Condition Specified Condition
      R7-1 (BCR+) - Body ground Engine switch on (IG) Below 1 V
      R7-2 (BCR-) - Body ground Engine switch on (IG) Below 1 V
    4. Turn the engine switch off.
    5. Disconnect the negative (-) terminal cable from the battery, 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 a 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 SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      R7-1 (BCR+) - R7-2 (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 SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      R7-1 (BCR+) - R7-2 (BCR-) Always 1 MΩ or higher
      R7-1 (BCR+) - Body ground Always 1 MΩ or higher
      R7-2 (BCR-) - Body ground Always 1 MΩ or higher

    NG: REPLACE FLOOR WIRE 

    OK: GO TO NEXT STEP 

  9. CHECK SIDE AIRBAG SENSOR RH 
    1. Interchange the side airbag sensor LH with RH and connect the connectors to them.
      2. Fig 3: Identifying Side Airbag Sensor LH And Center Airbag Sensor
      G04951002Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect the negative (-) terminal cable to the battery, 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 (see 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 (see DTC CHECK / CLEAR  ).

      Result 

      RESULT CHART

      Result Proceed to
      DTC B1623 and B1628 are not output A
      DTC B1628 is output B
      DTC B1623 is output C
    8. Turn the engine switch off.
    9. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
    10. Return the side airbag sensor LH and RH to their original position and connect the connectors to them.

    A: USE SIMULATION METHOD TO CHECK (See  DIAGNOSIS SYSTEM   ) 

    B: REPLACE SIDE AIRBAG SENSOR ASSEMBLY RH (See  SIDE AIRBAG SENSOR   ) 

    C: GO TO NEXT STEP 

  10. CHECK REAR AIRBAG SENSOR RH 
    1. Interchange the rear airbag sensor LH with RH and connect the connectors to them.
      2. Fig 4: Identifying Rear Airbag Sensor LH And SIDE Airbag Sensor RH
      G04951003Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect the negative (-) terminal cable to the battery, 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 (see 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 (see DTC CHECK / CLEAR  ). Result
      RESULT CHART

      Result Proceed to
      DTC B1628 is output A
      DTC B1623 is output B
      DTC B1623 and B1628 are not output C

      HINT:

      Codes other than DTC B1623/81 and B1628/82 may be output at this time, but they are not related to this check.

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

    A: REPLACE REAR AIRBAG SENSOR ASSEMBLY RH (See  REAR AIRBAG SENSOR   ) 

    B: REPLACE CENTER AIRBAG SENSOR ASSEMBLY (See  CENTER AIRBAG SENSOR ASSEMBLY   ) 

    C: USE SIMULATION METHOD TO CHECK (See  DIAGNOSIS SYSTEM   ) 

  11. CHECK CONNECTION OF CONNECTORS 
    1. Turn the engine switch off.
    2. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
    3. Check that the connectors are properly connected to the center airbag sensor and side airbag sensor LH.

      OK: The connectors are properly connected. 

    NG: CONNECT CONNECTORS PROPERLY 

    OK: GO TO NEXT STEP 

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

      OK: The connectors are not deformed or damaged. 

    NG: REPLACE NO. 2 FLOOR WIRE 

    OK: GO TO NEXT STEP 

  13. CHECK NO. 2 FLOOR WIRE (CENTER AIRBAG SENSOR - SIDE AIRBAG SENSOR LH) 
    Fig 5: Identifying Center Airbag Sensor And Side Airbag Sensor LH
    G04951004Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
    2. Turn the engine switch on (IG).
    3. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Switch Condition Specified Condition
      S5-4 (BBL+) - Body ground Engine switch on (IG) Below 1 V
      S5-3 (BBL-) - Body ground Engine switch on (IG) Below 1 V
    4. Turn the engine switch off.
    5. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
    6. Using a service wire, connect terminals 24 (BBL+) and 23 (BBL-) of connector B.
      NOTE: Do not forcibly insert a 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 SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      S5-4 (BBL+) - S5-3 (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 SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      S5-4 (BBL+) - S5-3 (BBL-) Always 1 MΩ or higher
      S54 (BBL+) - Body ground Always 1 MΩ or higher
      S5-3 (BBL-) - Body ground Always 1 MΩ or higher

    NG: REPLACE NO. 2 FLOOR WIRE 

    OK: GO TO NEXT STEP 

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

      OK: The connector is properly connected. 

    NG: CONNECT CONNECTORS PROPERLY 

    OK: GO TO NEXT STEP 

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

      OK: The connector is not deformed or damaged. 

    NG: REPLACE NO. 2 FLOOR WIRE 

    OK: GO TO NEXT STEP 

  16. CHECK NO. 2 FLOOR WIRE (SIDE AIRBAG SENSOR LH - REAR AIRBAG SENSOR LH) 
    Fig 6: Identifying Side Airbag Sensor LH and Rear Airbag Sensor LH Connector Terminal
    G04951005Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
    2. Turn the engine switch on (IG).
    3. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Switch Condition Specified Condition
      S5-1 (BCL+) - Body ground Engine switch on (IG) Below 1 V
      S5-2 (BCL-) - Body ground Engine switch on (IG) Below 1 V
    4. Turn the engine switch off.
    5. Disconnect the negative (-) terminal cable from the battery, 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 a 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 SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      S5-1 (BCL+) - S5-2 (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 SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      S5-1 (BCL+) - S5-2 (BCL-) Always 1 MΩ or higher
      S5-1 (BCL+) - Body ground Always 1 MΩ or higher
      S5-2 (BCL-) - Body ground Always 1 MΩ or higher

    NG: REPLACE NO. 2 FLOOR WIRE 

    OK: GO TO NEXT STEP 

  17. CHECK SIDE AIRBAG SENSOR LH 
    1. Interchange the side airbag sensor RH with LH and connect the connectors to them.
      2. Fig 7: Identifying Side Airbag Sensor RH And Center Airbag Sensor
      G04950997Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect the negative (-) terminal cable to the battery, 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 (see 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 (see DTC CHECK / CLEAR  ).

      Result 

      RESULT CHART

      Result Proceed to
      DTC B1623 is output A
      DTC B1623 and B1628 are not output B
      DTC B1628 is output C
    8. Turn the engine switch off.
    9. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
    10. Return the side airbag sensor RH and LH to their original position and connect the connectors to them.

    A: REPLACE SIDE AIRBAG SENSOR ASSEMBLY LH (See  SIDE AIRBAG SENSOR   ) 

    B: USE SIMULATION METHOD TO CHECK (See  DIAGNOSIS SYSTEM   ) 

    C: GO TO NEXT STEP 

  18. CHECK REAR AIRBAG SENSOR LH 
    1. Interchange the rear airbag sensor RH with LH and connect the connectors to them.
      2. Fig 8: Identifying Side Airbag Sensor RH And Side Airbag Sensor LH Connector Terminal
      G04951007Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect the negative (-) terminal cable to the battery, 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 (see 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 (see DTC CHECK / CLEAR  ).

      Result 

      RESULT CHART

      Result Proceed to
      DTC B1628 is output A
      DTC B1623 is output B
      DTC B1623 and B1628 are not output C

      HINT:

      Codes other than DTC B1623/81 and B1628/82 may be output at this time, but they are not related to this check.

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

    A: REPLACE CENTER AIRBAG SENSOR ASSEMBLY (See  CENTER AIRBAG SENSOR ASSEMBLY   ) 

    B: REPLACE REAR AIRBAG SENSOR ASSEMBLY LH (See  REAR AIRBAG SENSOR   ) 

    C: USE SIMULATION METHOD TO CHECK (See  DIAGNOSIS SYSTEM   ) 

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