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Home >> Toyota >> 2020 >> Mirai >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Airbag System - Diagnostic Codes (2 Of 3) >> Airbag System >> DTC B1692-81: Lost Communication with Door Side Airbag Sensor RH; DTC B1693-81: Door Side Airbag Sensor RH Initialization Incomplete [06/2015 - ] >> Procedure

DTC B1692-81: Lost Communication with Door Side Airbag Sensor RH; DTC B1693-81: Door Side Airbag Sensor RH Initialization Incomplete [06/2015 - ]: 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.

      Refer to DTC CHECK / CLEAR [06/2015 - ]

      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.

      Refer to DTC CHECK / CLEAR [06/2015 - ]

      Body Electrical > SRS Airbag > Trouble Codes 

      Result

      Result Proceed to
      DTC B1692/81 or B1693/81 is output A
      DTC B1692/81 or B1693/81 is not output B

      HINT: 

      Codes other than DTC B1692/81 and B1693/81 may be output at this time, but they are not related to this check.

    Result: 

    B 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [06/2015 - 11/2018]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2018 - ] 

    Result: 

    A 

    See step  2

  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 rear airbag sensor RH and door side airbag sensor assembly RH.

      OK

      The connectors are properly connected.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    CONNECT CONNECTORS PROPERLY 

    Result: 

    OK 

    See step  3

  3. CHECK CONNECTORS 
    1. Disconnect the connectors from the rear airbag sensor RH and door side airbag sensor assembly RH.
      GTY550019Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Door Side Airbag Sensor RH
      *2 Rear Airbag Sensor RH
      *3 Front Door Wire RH
      *4 No. 2 Floor Wire
    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

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  4

  4. CHECK DOOR SIDE AIRBAG SENSOR ASSEMBLY RH CIRCUIT 
    1. Disconnect the cable from the negative (-) auxiliary battery terminal and wait for at least 2 seconds.
      GTY541676Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Door Side Airbag Sensor Assembly RH
      *2 Rear Airbag Sensor RH
      *3 Front Door Wire RH
      *4 No. 2 Floor Wire
      *a Front view of wire harness connector
      (to Door side airbag sensor assembly RH)
      *b Front view of wire harness connector
      (to Rear airbag sensor RH)
      *c Service Wire
    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
      L7-2 (BDR+) - Body ground Power switch on (IG) Below 1 V
      L7-1 (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 (BDR+) - 2 (BDR-) 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
      L7-2 (BDR+) - L7-1 (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
      L7-2 (BDR+) - L7-1 (BDR-) 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
      L7-2 (BDR+) - Body ground Always 1 MΩ or higher
      L7-1 (BDR-) - Body ground Always 1 MΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  7

    Result: 

    OK 

    See step  5

  5. CHECK SIDE AIR BAG SENSOR ASSEMBLY RH 
    1. Connect the connector to rear airbag sensor RH.
      GTY556841Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Door Side Airbag Sensor Assembly LH
      *2 Rear Airbag Sensor RH
    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.

      Refer to DTC CHECK / CLEAR [06/2015 - ]

      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.

      Refer to DTC CHECK / CLEAR [06/2015 - ]

      Body Electrical > SRS Airbag > Trouble Codes 

      Result

      Result Proceed to
      DTC B1692/81 or B1693/81 is output A
      DTC B1697/82 or B1698/82 is output B
      DTC B1692/81, B1693/81, B1697/82 and B1698/82 are not output C

      HINT: 

      Codes other than DTCs B1692/81, B1693/81, B1697/82 and B1698/82 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 side airbag sensor assembly RH and LH to their original positions and connect the connectors.

    Result: 

    B 

    REPLACE DOOR SIDE AIRBAG SENSOR ASSEMBLY RH. Refer to  REMOVAL [06/2015 - 11/2018]  , or refer to  REMOVAL [11/2018 - ] 

    Result: 

    C 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [06/2015 - 11/2018]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2018 - ] 

    Result: 

    A 

    See step  6

  6. CHECK REAR AIRBAG SENSOR RH 
    1. Interchange the rear airbag sensor RH with LH and connect the connectors.
      GTY544166Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Rear Airbag Sensor Assembly LH
      *2 Side Airbag Sensor Assembly RH
    2. Disconnect the cable from 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 stored in memory.

      Refer to DTC CHECK / CLEAR [06/2015 - ]

      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.

      Refer to DTC CHECK / CLEAR [06/2015 - ]

      Body Electrical > SRS Airbag > Trouble Codes 

      Result

      Result Proceed to
      DTC B1692/81 or B1693/81 is output A
      DTC B1697/82 or B1698/82 is output B
      DTC B1692/81, B1693/81, B1697/82 and B1698/82 are not output C

      HINT: 

      Codes other than DTCs B1692/81, B1693/81, B1697/82 and B1698/82 may be output at this time, but they are not related to this check.

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

    Result: 

    A 

    REPLACE AIRBAG SENSOR ASSEMBLY. Refer to  REMOVAL [06/2015 - 11/2018]  , or refer to  REMOVAL [11/2018 - ] 

    Result: 

    B 

    REPLACE REAR AIRBAG SENSOR RH. Refer to  REMOVAL [06/2015 - 11/2018]  , or refer to  REMOVAL [11/2018 - ] 

    Result: 

    C 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [06/2015 - 11/2018]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2018 - ] 

  7. CHECK NO. 2 FLOOR WIRE 
    1. Disconnect the floor wire no. 2 connector from the front door wire RH.
      GTY579979Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Door Side Airbag Sensor RH
      *2 Rear Airbag Sensor RH
      *3 Front Door Wire RH
      *4 No. 2 Floor Wire
      *a Front view of wire harness connector
      (to Rear Door Wire No. 1)
      *b Front view of wire harness connector rear
      (to Rear Airbag Sensor RH)
      *c Service Wire
    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
      LQ1-1 (BDR+) - Body ground Power switch on (IG) Below 1 V
      LQ1-2 (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 1 (BDR+) - 2 (BDR-) 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
      LQ1-1 (BDR+) - LQ1-2 (BDR-) 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
      LQ1-1 (BDR+) - LQ1-2 (BDR-) 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
      LQ1-1 (BDR+) - Body ground Always 1 MΩ or higher
      LQ1-2 (BDR-) - Body ground Always 1 MΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE FRONT DOOR WIRE RH 

    Result: 

    NG 

    REPLACE NO. 2 FLOOR WIRE 

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