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Home >> Scion >> 2013 >> iQ EV >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Supplemental Restraint System (Diagnostic Codes B1000/31 - B1690/15) (Electric) >> Airbag System >> DTC B1639/81: Rear Sensor Initialization Incomplete RH >> Procedure

DTC B1639/81: Rear Sensor Initialization Incomplete RH: Procedure

  1. CHECK HISTORY DTC 
    1. Turn the power switch on (IG), and wait for at least 60 seconds.
    2. Check for history DTCs. Refer to DTC CHECK / CLEAR .

      Result

      History DTC B1634/81 is not output.

      HINT: 

      Codes other than history DTC B1634/81 may be output at this time, but they are not related to this check.

    NG → See step   9 

    OK: Go to next step 

  2. CHECK CONNECTORS 
    1. Turn the power switch off.
    2. Disconnect the cable from the negative (-) auxiliary battery terminal.
      WARNING:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

    3. Check that the connectors are properly connected to the airbag ECU assembly, side airbag sensor assembly RH and rear airbag sensor RH.

      OK

      The connectors are properly connected.

      HINT: 

      If the connectors are not connected securely, reconnect the connectors and proceed to the next inspection.

    4. Disconnect the connectors from the airbag ECU assembly, side airbag sensor assembly RH and rear airbag sensor RH.
    5. Check that the terminals of connectors are not damaged.

      OK

      The terminals are not deformed or damaged.

    NG → REPLACE WIRE HARNESS 

    OK: Go to next step 

  3. CHECK SIDE AIRBAG SENSOR ASSEMBLY RH 
    1. Connect the connectors to the rear airbag sensor RH.
      Fig 1: Identifying Side Airbag Sensor Assembly LH & Door Side Airbag Sensor RH Circuit
      GTY384898Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Interchange the side airbag sensor assembly RH with side airbag sensor assembly LH and connect the connectors.
    3. Connect the cable to the negative (-) auxiliary battery terminal.
    4. Turn the power 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 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 .
      RESULT

      Result Proceed to
      DTC B1639/81 is output. A
      DTC B1649/82 is output. B
      DTCs B1639/81 and B1649/82 are not output. C

      HINT: 

      Codes other than DTCs B1639/81 and B1649/82 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.
      WARNING:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

    11. Return the side airbag sensor assembly RH and side airbag sensor assembly LH to their original positions and connect the connectors.
      TEXT IN ILLUSTRATION

      *1 Side Airbag Sensor Assembly LH
      *2 Door Side Airbag Sensor RH

    B → See step   11 

    C → See step   10 

    A: Go to next step 

  4. CHECK FLOOR WIRE (OPEN) See step   3 

    NG → REPLACE FLOOR WIRE 

    OK: Go to next step 

  5. CHECK FLOOR WIRE (SHORT) See step   4 

    NG → REPLACE FLOOR WIRE 

    OK: Go to next step 

  6. CHECK FLOOR WIRE (SHORT TO B+) See step   5 

    NG → REPLACE FLOOR WIRE 

    OK: Go to next step 

  7. CHECK FLOOR WIRE (SHORT TO GROUND) See step   6 

    NG → REPLACE FLOOR WIRE 

    OK: Go to next step 

  8. CHECK REAR AIRBAG SENSOR RH 
    1. Interchange the rear airbag sensor RH with rear airbag sensor LH and connect the connectors.
      Fig 2: Identifying Rear Airbag Sensor LH & Side Airbag Sensor Assembly RH Circuit
      GTY387266Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect the cable to the negative (-) auxiliary battery terminal.
    3. Turn the power 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 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 .
      RESULT

      Result Proceed to
      DTCs B1639/81 and B1649/82 are not output. A
      DTC B1639/81 is output. B
      DTC B1649/82 is output. C

      HINT: 

      Codes other than DTCs B1639/81 and B1649/82 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.
      WARNING:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

    10. Return the rear airbag sensor RH and rear airbag sensor LH to their original positions and connect the connectors.
      TEXT IN ILLUSTRATION

      *1 Rear Airbag Sensor LH
      *2 Side Airbag Sensor Assembly RH

    B → See step   13 

    C → See step   12 

    A → See step   10 

  9. GO TO DTC 1634/81. Refer to  DTC B1634/81: Lost Communication with Rear Sensor Bus RH  
  10. USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING 
  11. REPLACE SIDE AIRBAG SENSOR ASSEMBLY RH. Refer to  REMOVAL 
  12. REPLACE REAR AIRBAG SENSOR RH. Refer to  REMOVAL 
  13. REPLACE AIRBAG ECU ASSEMBLY. Refer to  REMOVAL 
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