LEMON Manuals: Even more car manuals for everyone
Home >> Lexus >> 2023 >> LS 500h >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Airbag System (W/O Advanced Park) - Diagnostic Codes (1 Of 3) >> AIRBAG SYSTEM (w/o Advanced Park) >> DTC B162B: Side Airbag Sensor Assembly No. 2 Lost Communication (RH); DTC B162C: Side Airbag Sensor Assembly No. 2 Initialization Error (RH) [10/2020 - 11/2021] >> Procedure

DTC B162B: Side Airbag Sensor Assembly No. 2 Lost Communication (RH); DTC B162C: Side Airbag Sensor Assembly No. 2 Initialization Error (RH) [10/2020 - 11/2021]: Procedure

  1. 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 60 seconds.
    3. Check that the connectors are properly connected to the airbag ECU assembly and No. 2 side airbag sensor assembly RH.

      Result

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

    Result: 

    The connectors are not properly connected 

    CONNECT CONNECTORS PROPERLY 

    Result: 

    The connectors are properly connected 

    See step  2

  2. CHECK CONNECTORS 
    1. Disconnect the connectors from the airbag ECU assembly and No. 2 side airbag sensor assembly RH.
    2. Check that the connectors (on the airbag ECU assembly side and No. 2 side airbag sensor assembly RH side) are not damaged.
      GTY821657Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 2 side Airbag Sensor Assembly RH
      *2 Airbag ECU Assembly
      *3 Floor Wire

      Result

      Proceed to
      The connectors are not deformed or damaged
      The connectors are deformed or damaged

    Result: 

    The connectors are deformed or damaged 

    REPLACE FLOOR WIRE 

    Result: 

    The connectors are not deformed or damaged 

    See step  3

  3. CHECK FLOOR WIRE 
    1. Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
      GTY832803Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 2 Side Airbag Sensor Assembly RH
      *2 Airbag ECU Assembly
      *3 Floor Wire
      *4 Service Wire
      *a Front view of wire harness connector
      (to No. 2 Side Airbag Sensor Assembly RH)
      *b Front 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
      L97-2 (BFR+) - Body ground Power switch on (IG) Below 1 V
      L97-1 (BFR-) - 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 60 seconds.
    6. Using a service wire, connect terminals 28 (BCR+) and 27 (BCR-) 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
      L97-2 (BFR+) - L97-1 (BFR-) 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
      L97-2 (BFR+) - L97-1 (BFR-) Always 1 MΩ or higher
      L97-2 (BFR+) - Body ground Always 1 MΩ or higher
      L97-1 (BFR-) - Body ground Always 1 MΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE FLOOR WIRE 

    Result: 

    OK 

    See step  4

  4. CHECK NO. 2 SIDE AIRBAG SENSOR ASSEMBLY RH 
    1. Connect the connectors to the airbag ECU assembly.
    2. Interchange the No. 2 side airbag sensor assembly RH with LH and connect the connectors to them.
      GTY505878Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 2 Side Airbag Sensor Assembly LH
      *2 Airbag ECU Assembly
    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.

      Refer to DTC CHECK / CLEAR [10/2020 - 10/2023]

      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 [10/2020 - 10/2023]

      Body Electrical > SRS Airbag > Trouble Codes 

      Result

      Proceed to
      DTC B162B or B162C is output
      DTC B163B or B163C is output
      DTC B162B, B162C, B163B and B163C are not output

      HINT: 

      Codes other than DTC B162B, B162C, B163B and B163C 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 60 seconds.
    11. Return the side airbag sensor LH and RH to their original positions and connect the connectors to them.

    Result: 

    DTC B162B or B162C is output 

    REPLACE AIRBAG ECU ASSEMBLY. Refer to  REMOVAL [10/2020 - 11/2021] 

    Result: 

    DTC B163B or B163C is output 

    REPLACE NO. 2 SIDE AIRBAG SENSOR ASSEMBLY RH. Refer to  REMOVAL [10/2020 - 11/2021] 

    Result: 

    DTC B162B, B162C, B163B and B163C are not output 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2020 - 11/2021] 

scientia non olet · About LEMON Manuals