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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 B1634/81: Lost Communication with Rear Sensor Bus RH >> Procedure

DTC B1634/81: Lost Communication with Rear Sensor Bus RH: Procedure

  1. 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 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 side airbag sensor assembly RH and rear airbag sensor RH.
    5. Check that the terminals of connectors are not damaged.

      OK

      The connectors are not deformed or damaged.

    NG → REPLACE WIRE HARNESS 

    OK: Go to next step 

  2. CHECK SIDE AIRBAG SENSOR ASSEMBLY RH 
    Fig 1: Identifying Side Airbag Sensor Assembly LH & Door Side Airbag Sensor RH Circuit
    GTY384898Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Interchange the side airbag sensor assembly RH with side airbag sensor assembly LH and connect the connectors to them.
    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. 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
      DTC B1634/81 is output A
      DTC B1634/81 and B1644/82 are not output B
      DTC B1644/82 is output C
      TEXT IN ILLUSTRATION

      *1 Side Airbag Sensor Assembly LH
      *2 Door Side Airbag Sensor RH
    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 side airbag sensor assembly RH and side airbag sensor assembly LH to their original positions and connect the connectors to them.

    B → See step   8 

    C → See step   9 

    A: Go to next step 

  3. CHECK FLOOR WIRE (OPEN) 
    1. Using a service wire, connect terminals 2 (BER+) and 1 (BER-) of connector C.
      Fig 2: Measuring Resistance Of Side Airbag Sensor Assembly RH & Rear Airbag Sensor RH Connectors
      GTY388907Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:

      Do not forcibly insert the service wire into the terminals of the connector when connecting the wire.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G12-1 (BER+) - G12-2 (BER-) Always Below 1 Ω
    3. Disconnect the service wire from connector C.
      TEXT IN ILLUSTRATION

      *1 Rear Airbag Sensor RH
      *2 Side Airbag Sensor Assembly RH
      *3 Floor Wire
      *4 Service Wire
      *a Front view of wire harness connector
      (to Side Airbag Sensor Assembly RH)
      *b Front view of wire harness connector
      (to Rear Airbag Sensor RH)

    NG → REPLACE FLOOR WIRE 

    OK: Go to next step 

  4. CHECK FLOOR WIRE (SHORT) 
    1. Measure the resistance according to the value(s) in the table below.
      Fig 3: Measuring Resistance Of Side Airbag Sensor Assembly RH Connector
      GTY390937Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      G12-1 (BER+) - G12-2 (BER-) Always 1 MΩ or higher
      TEXT IN ILLUSTRATION

      *1 Rear Airbag Sensor RH
      *2 Side Airbag Sensor Assembly RH
      *3 Floor Wire
      *a Front view of wire harness connector
      (to Side Airbag Sensor Assembly RH)

    NG → REPLACE FLOOR WIRE 

    OK: Go to next step 

  5. CHECK FLOOR WIRE (SHORT TO B+) 
    1. Connect the cable to the negative (-) auxiliary battery terminal.
      Fig 4: Measuring Voltage Of Side Airbag Sensor Assembly RH Connector
      GTY390937Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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
      G12-1 (BER+) - Body ground Power switch on (IG) Below 1 V
      G12-2 (BER-) - 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.
      WARNING:

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

      TEXT IN ILLUSTRATION

      *1 Rear Airbag Sensor RH
      *2 Side Airbag Sensor Assembly RH
      *3 Floor Wire
      *a Front view of wire harness connector
      (to Side Airbag Sensor Assembly RH)

    NG → REPLACE FLOOR WIRE 

    OK: Go to next step 

  6. CHECK FLOOR WIRE (SHORT TO GROUND) 
    1. Measure the resistance according to the value(s) in the table below.
      Fig 5: Measuring Resistance Of Side Airbag Sensor Assembly RH Connector
      GTY390937Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      G12-1 (BER+) - Body ground Always 1 MΩ or higher
      G12-2 (BER-) - Body ground Always 1 MΩ or higher
      TEXT IN ILLUSTRATION

      *1 Rear Airbag Sensor RH
      *2 Side Airbag Sensor Assembly RH
      *3 Floor Wire
      *a Front view of wire harness connector
      (to Side Airbag Sensor Assembly RH)

    NG → REPLACE FLOOR WIRE 

    OK: Go to next step 

  7. CHECK REAR AIRBAG SENSOR RH 
    1. Interchange the rear airbag sensor RH with rear airbag sensor LH and connect the connectors.
      Fig 6: Identifying Rear Airbag Sensor LH & Side Airbag Sensor Assembly RH Circuit
      GTY392207Courtesy 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 B1634/81 and B1644/82 are not output. A
      DTC B1634/81 is output. B
      DTC B1644/82 is output. C

      HINT: 

      Codes other than DTCs B1634/81 and B1644/82 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   10 

    C → See step   11 

    A → See step   8 

  8. USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING 
  9. REPLACE SIDE AIRBAG SENSOR ASSEMBLY RH. Refer to  REMOVAL 
  10. REPLACE AIRBAG ECU ASSEMBLY. Refer to  REMOVAL 
  11. REPLACE REAR AIRBAG SENSOR RH. Refer to  REMOVAL 
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