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Home >> Toyota >> 2013 >> Prius Plug-in >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Supplemental Restraint System (Diagnostic Codes (B1000/31 - B1905/74) & Symptom Tests)) (Plug-In) >> Airbag System >> DTC B1617/84: Lost Communication with Front Airbag Sensor LH; DTC B1618/84: Front Airbag Sensor LH Initialization Incomplete >> Procedure

DTC B1617/84: Lost Communication with Front Airbag Sensor LH; DTC B1618/84: Front Airbag Sensor LH Initialization Incomplete: 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 airbag ECU assembly and front airbag sensor LH. Also check that the connectors that link the engine room main wire and instrument panel wire are properly connected.

      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 and front airbag sensor LH. Also disconnect the connectors that link the engine room main wire and instrument panel wire.
    5. Check that the terminals of the connectors are not damaged.

      OK

      The terminals are not deformed or damaged.

    NG → REPLACE WIRE HARNESS 

    OK: Go to next step 

  2. CHECK FRONT AIRBAG SENSOR LH CIRCUIT (OPEN) 
    1. Connect the connectors that link the engine room main wire and instrument panel wire.
      Fig 1: Checking Front Airbag Sensor LH Circuit For Open
      GTY343820Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Using a service wire, connect terminals 30 (+SL) and 28 (-SL) of connector B.
      NOTE:

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

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      A8-2 (+SL) - A8-1 (-SL) Always Below 1 Ω
      TEXT IN ILLUSTRATION

      *1 Front Airbag Sensor LH
      *2 Airbag ECU Assembly
      *3 Service Wire
      *a Front view of wire harness connector
      (to Airbag ECU Assembly)
      *b Front view of wire harness connector
      (to Front Airbag Sensor LH)

    NG → See step   7 

    OK: Go to next step 

  3. CHECK FRONT AIRBAG SENSOR LH CIRCUIT (SHORT) 
    1. Disconnect the service wire from connector B.
      Fig 2: Checking Front Airbag Sensor LH Circuit For Short To Ground
      GTY341974Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A8-2 (+SL) - A8-1 (-SL) Always 1 MΩ or higher
      TEXT IN ILLUSTRATION

      *1 Front Airbag Sensor LH
      *2 Airbag ECU Assembly
      *a Front view of wire harness connector
      (to Front Airbag Sensor LH)

    NG → See step   8 

    OK: Go to next step 

  4. CHECK FRONT AIRBAG SENSOR LH CIRCUIT (SHORT TO B+) 
    1. Connect the cable to the negative (-) auxiliary battery terminal.
      Fig 3: Checking Front Airbag Sensor LH Circuit For Short To Ground
      GTY341974Courtesy 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 Condition Specified Condition
      A8-2 (+SL) - Body ground Power switch on (IG) Below 1 V
      A8-1 (-SL) - 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 Front Airbag Sensor LH
      *2 Airbag ECU Assembly
      *a Front view of wire harness connector
      (to Front Airbag Sensor LH)

    NG → See step   9 

    OK: Go to next step 

  5. CHECK FRONT AIRBAG SENSOR LH CIRCUIT (SHORT TO GROUND) 
    1. Measure the resistance according to the value(s) in the table below.
      Fig 4: Checking Front Airbag Sensor LH Circuit For Short To Ground
      GTY341974Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      A8-2 (+SL) - Body ground Always 1 MΩ or higher
      A8-1 (-SL) - Body ground Always 1 MΩ or higher
      TEXT IN ILLUSTRATION

      *1 Front Airbag Sensor LH
      *2 Airbag ECU Assembly
      *a Front view of wire harness connector
      (to Front Airbag Sensor LH)

    NG → See step   10 

    OK: Go to next step 

  6. CHECK FRONT AIRBAG SENSOR LH 
    1. Connect the connector to the airbag ECU assembly.
      Fig 5: Identifying Front Airbag Sensor Connector
      GTY320490Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Interchange the front airbag sensor LH with RH and connect the connectors.
    3. Connect the cable to the negative (-) auxiliary battery terminal.
    4. Clear the DTCs stored in 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 B1612/83, B1613/83, B1617/84 and B1618/84 are not output. A
      DTC B1617/84 or B1618/84 is output. B
      DTC B1612/83 or B1613/83 is output. C

      HINT: 

      Codes other than DTCs B1612/83, B1613/83, B1617/84 and B1618/84, 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 front airbag sensor LH and RH to their original positions and connect the connectors.
      TEXT IN ILLUSTRATION

      *1 Front Airbag Sensor RH
      *2 Airbag ECU Assembly

    B → See step   13 

    C → See step   12 

    A → See step   11 

  7. CHECK INSTRUMENT PANEL WIRE (OPEN) 
    1. Disconnect the instrument panel wire connector from the engine room main wire.
      Fig 6: Checking Instrument Panel Wire For Open
      GTY330877Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT: 

      The service wire has already been inserted into connector B.

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      AL6-1 (+SL) - AL6-2 (-SL) Always Below 1 Ω
    3. Disconnect the service wire from connector B.
      TEXT IN ILLUSTRATION

      *1 Front Airbag Sensor LH
      *2 Airbag ECU Assembly
      *3 Engine Room Main Wire
      *4 Instrument Panel Wire
      *5 Service Wire
      *a Front view of wire harness connector
      (to Airbag ECU Assembly)
      *b Front view of wire harness connector
      (to Engine Room Main Wire)

    NG → REPLACE INSTRUMENT PANEL WIRE 

    OK → REPLACE ENGINE ROOM MAIN WIRE 

  8. CHECK INSTRUMENT PANEL WIRE (SHORT) 
    1. Disconnect the instrument panel wire connector from the engine room main wire.
      Fig 7: Checking Instrument Panel Wire For Short To Ground
      GTY325882Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      AL6-1 (+SL) - AL6-2 (-SL) Always 1 MΩ or higher
      TEXT IN ILLUSTRATION

      *1 Front Airbag Sensor LH
      *2 Airbag ECU Assembly
      *3 Engine Room Main Wire
      *4 Instrument Panel Wire
      *a Front view of wire harness connector
      (to Engine Room Main Wire)

    NG → REPLACE INSTRUMENT PANEL WIRE 

    OK → REPLACE ENGINE ROOM MAIN WIRE 

  9. CHECK INSTRUMENT PANEL WIRE (SHORT TO B+) 
    1. Disconnect the instrument panel wire connector from the engine room main wire.
      Fig 8: Checking Instrument Panel Wire For Short To Ground
      GTY325882Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect the cable to the negative (-) auxiliary battery terminal.
    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
      AL6-1 (+SL) - Body ground Power switch on (IG) Below 1 V
      AL6-2 (-SL) - Body ground Power switch on (IG) Below 1 V
      TEXT IN ILLUSTRATION

      *1 Front Airbag Sensor LH
      *2 Airbag ECU Assembly
      *3 Engine Room Main Wire
      *4 Instrument Panel Wire
      *a Front view of wire harness connector
      (to Engine Room Main Wire)

    NG → REPLACE INSTRUMENT PANEL WIRE 

    OK → REPLACE ENGINE ROOM MAIN WIRE 

  10. CHECK INSTRUMENT PANEL WIRE (SHORT TO GROUND) 
    1. Disconnect the instrument panel wire connector from the engine room main wire.
      Fig 9: Checking Instrument Panel Wire For Short To Ground
      GTY325882Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      AL6-1 (+SL) - Body ground Always 1 MΩ or higher
      AL6-2 (-SL) - Body ground Always 1 MΩ or higher
      TEXT IN ILLUSTRATION

      *1 Front Airbag Sensor LH
      *2 Airbag ECU Assembly
      *3 Engine Room Main Wire
      *4 Instrument Panel Wire
      *a Front view of wire harness connector
      (to Engine Room Main Wire)

    NG → REPLACE INSTRUMENT PANEL WIRE 

    OK → REPLACE ENGINE ROOM MAIN WIRE 

  11. USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING 
  12. REPLACE FRONT AIRBAG SENSOR LH. Refer to  REMOVAL 
  13. REPLACE AIRBAG ECU ASSEMBLY. Refer to  REMOVAL 
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