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AIRBAG SYSTEM, Diagnostic DTC:B1635, B1637

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DTC Code DTC Name
B1635 Curtain Shield Airbag Sensor (LH)
B1637 Curtain Shield Airbag Sensor Lost Communication (LH)
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DESCRIPTION

The rear airbag sensor LH consists of a lateral deceleration sensor, etc.

If the airbag ECU assembly receives signals from the lateral deceleration sensor, it determines whether the SRS should be activated.

DTC B1635 or B1637 is stored when a malfunction is detected in the rear airbag sensor LH circuit.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Test Mode / Check Mode
B1635 Curtain Shield Airbag Sensor (LH)

Either condition is met:


  • A rear airbag sensor LH malfunction.

  • An airbag ECU assembly malfunction.

  • Rear airbag sensor LH

  • Airbag ECU assembly

 Comes on Not applicable
B1637 Curtain Shield Airbag Sensor Lost Communication (LH)

Either condition is met:


  • A rear airbag sensor LH malfunction.

  • An airbag ECU assembly malfunction.

  • Rear airbag sensor LH

  • Airbag ECU assembly

 Comes on Not applicable
Table 1. *a Rear Airbag Sensor LH *b Door Side Airbag Sensor LH *c Side Airbag Sensor Assembly LH *d Airbag ECU Assembly
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WIRING DIAGRAM

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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.

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  • When disconnecting the cable from the negative (-) auxiliary battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected.

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PROCEDURE


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    CHECK DTC


    1. Turn the power switch on (IG), and wait for at least 60 seconds.

    2. Clear the DTCs stored in memory.

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      1. Body Electrical > SRS Airbag > Clear DTCs


    3. Turn the power switch off.

    4. Turn the power switch on (IG), and wait for at least 60 seconds.

    5. Check for DTCs.

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      1. Body Electrical > SRS Airbag > Trouble Codes


      Result
      Proceed to
      DTC B1635 or B1637 is output
      DTC B1635 and B1637 are not output
      Tip:

      Codes other than DTC B1635 and B1637 may be output at this time, but they are not related to this check.


    • DTC B1635 or B1637 is outputClick here
    • DTC B1635 and B1637 are not output

      USE SIMULATION METHOD TO CHECKClick here

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    CHECK REAR AIRBAG SENSOR LH


    1. B004RIRC33
      *1 Rear Airbag Sensor RH
      *2 Airbag ECU Assembly

      Turn the power switch off.

    2. Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 90 seconds.

    3. Interchange the rear airbag sensor LH with RH and connect the connectors to them.

    4. Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.

    5. Turn the power switch on (IG), and wait for at least 60 seconds.

    6. Clear the DTCs stored in memory.

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      1. Body Electrical > SRS Airbag > Clear DTCs


    7. Turn the power switch off.

    8. Turn the power switch on (IG), and wait for at least 60 seconds.

    9. Check for DTCs.

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      1. Body Electrical > SRS Airbag > Trouble Codes


      Result
      Proceed to
      DTC B1630 or B1632 is output
      DTC B1635 or B1637 is output
      DTC B1630, B1632, B1635 and B1637 are not output
      Tip:

      Codes other than DTC B1630, B1632, B1635 and B1637 may be output at this time, but they are not related to this check.

    10. Turn the power switch off.

    11. Disconnect the cable from the negative (-) auxiliary 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.


    • DTC B1630 or B1632 is output

      REPLACE REAR AIRBAG SENSOR LHClick here

    • DTC B1635 or B1637 is output

      REPLACE AIRBAG ECU ASSEMBLYClick here

    • DTC B1630, B1632, B1635 and B1637 are not output

      USE SIMULATION METHOD TO CHECKClick here