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Home >> Lexus >> 2010 >> RX 350 FWD >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Supplemental Restraint System (Diagnostic Codes (B1000/31 - B1638/82) >> Airbag System >> DTC B1608/84: Front Satellite Sensor Bus LH Initialization Incomplete; DTC B1617/84: Lost Communication with Front Airbag Sensor LH; DTC B1618/84: Front Airbag Sensor LH Initialization Incomplete (To 8/2009) >> Procedure

DTC B1608/84: Front Satellite Sensor Bus LH Initialization Incomplete; DTC B1617/84: Lost Communication with Front Airbag Sensor LH; DTC B1618/84: Front Airbag Sensor LH Initialization Incomplete (To 8/2009): Procedure

  1. CHECK CONNECTORS 
    1. Turn the engine switch off.
    2. Disconnect the cable from the negative (-) battery terminal.
      NOTE:

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

    3. Check that the connectors are properly connected to the center airbag sensor 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 center airbag sensor 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 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: Identifying F29 & A5 Connectors
      GTY264694Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Using SST, connect terminals 30 (+SL) and 28 (-SL) of connector B.
      NOTE:

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

      • SST: 09843-18040 
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A5-2 (+SL) - A5-1 (-SL) Always Below 1 Ω
      TEXT IN ILLUSTRATION

      *1 Front Airbag Sensor LH *2 Center Airbag Sensor Assembly
      *3 Front view of wire harness connector
      (to Center Airbag Sensor Assembly)      		 *4 Front view of wire harness connector
      (to Front Airbag Sensor LH)
      *5 Connector B *6 Connector E

    NG → See step   7 

    OK: Go to next step 

  3. CHECK FRONT AIRBAG SENSOR LH CIRCUIT (SHORT) 
    1. Disconnect SST from connector B.
      Fig 2: Identifying A5 Connectors
      GTY267294Courtesy 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
      A5-2 (+SL) - A5-1 (-SL) Always 1 MΩ or higher
      TEXT IN ILLUSTRATION

      *1 Front Airbag Sensor LH
      *2 Center Airbag Sensor Assembly
      *3 Front view of wire harness connector
      (to Front Airbag Sensor LH)
      *4 Connector E

    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 (-) battery terminal.
      Fig 3: Identifying A5 Connector
      GTY267294Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Turn the engine switch on (IG).
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      A5-2 (+SL) - Body ground Engine switch on (IG) Below 1 V
      A5-1 (-SL) - Body ground Engine switch on (IG) Below 1 V
      TEXT IN ILLUSTRATION

      *1 Front Airbag Sensor LH
      *2 Center Airbag Sensor Assembly
      *3 Front view of wire harness connector
      (to Front Airbag Sensor LH)
      *4 Connector E

    NG → See step   9 

    OK: Go to next step 

  5. CHECK FRONT AIRBAG SENSOR LH CIRCUIT (SHORT TO GROUND) 
    1. Turn the engine switch off.
      Fig 4: Identifying A5 Connectors
      GTY267294Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the cable from the negative (-) battery terminal.
      NOTE:

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

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      A5-2 (+SL) - Body ground Always 1 MΩ or higher
      A5-1 (-SL) - Body ground Always 1 MΩ or higher
      TEXT IN ILLUSTRATION

      *1 Front Airbag Sensor LH
      *2 Center Airbag Sensor Assembly
      *3 Front view of wire harness connector
      (to Front Airbag Sensor LH)
      *4 Connector E

    NG → See step   10 

    OK: Go to next step 

  6. CHECK FRONT AIRBAG SENSOR LH 
    1. Connect the connector to the center airbag sensor assembly.
      Fig 5: Interchange The Front Airbag Sensor RH
      GTY256051Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Interchange the front airbag sensor RH with LH and connect the connectors.
    3. Connect the cable to the negative (-) battery terminal.
    4. Turn the engine 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 engine switch off.
    7. Turn the engine switch on (IG), and wait for at least 60 seconds.
    8. Check for DTCs. Refer to DTC CHECK / CLEAR .

      Result

      Result Proceed to
      DTC B1603/83, B1612/83, B1613/83, B1608/84, B1617/84 and B1618/84 are not output A
      DTC B1608/84, B1617/84 or B1618/84 is output B
      DTC B1603/83, B1612/83 or B1613/83 is output C
      TEXT IN ILLUSTRATION

      *1 Front Airbag Sensor RH
      *2 Center Airbag Sensor Assembly

      HINT: 

      Codes other than DTC B1603/83, B1612/83, B1613/83, B1608/84, B1617/84 and B1618/84, may be output at this time, but they are not related to this check.

    C → See step   11 

    B → See step   12 

    A → See step   13 

  7. CHECK INSTRUMENT PANEL WIRE (OPEN) 
    1. Disconnect the instrument panel wire connector from the engine room main wire.
      Fig 6: Identifying F29 & AF6 Connectors
      GTY284546Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT: 

      SST 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
      AF6-1 (+SL) - AF6-2 (-SL) Always Below 1 Ω
      TEXT IN ILLUSTRATION

      *1 Front Airbag Sensor LH *2 Center Airbag Sensor Assembly
      *3 Engine Room Main Wire *4 Instrument Panel Wire
      *5 Front view of wire harness connector
      (to Center Airbag Sensor Assembly)      		 *6 Front view of wire harness connector
      (to Engine Room Main Wire)
      *7 Connector B *8 Connector C

    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: Identifying AF6 Connector
      GTY255714Courtesy 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
      AF6-1 (+SL) - AF6-2 (-SL) Always 1 MΩ or higher
      TEXT IN ILLUSTRATION

      *1 Front Airbag Sensor LH
      *2 Center Airbag Sensor Assembly
      *3 Engine Room Main Wire
      *4 Instrument Panel Wire
      *5 Front view of wire harness connector
      (to Engine Room Main Wire)
      *6 Connector C

    NG → REPLACE INSTRUMENT PANEL WIRE 

    OK → REPLACE ENGINE ROOM MAIN WIRE 

  9. CHECK INSTRUMENT PANEL WIRE (SHORT TO B+) 
    1. Turn the engine switch off.
      Fig 8: Identifying AF6 Connector
      GTY255714Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the cable from the negative (-) battery terminal.
      NOTE:

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

    3. Disconnect the instrument panel wire connector from the engine room main wire.
    4. Connect the cable to the negative (-) battery terminal.
    5. Turn the engine switch on (IG).
    6. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      AF6-1 (+SL) - Body ground Engine switch on (IG) Below 1 V
      AF6-2 (-SL) - Body ground Engine switch on (IG) Below 1 V
      TEXT IN ILLUSTRATION

      *1 Front Airbag Sensor LH
      *2 Center Airbag Sensor Assembly
      *3 Engine Room Main Wire
      *4 Instrument Panel Wire
      *5 Front view of wire harness connector
      (to Engine Room Main Wire)
      *6 Connector C

    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: Identifying AF6 Connector
      GTY255714Courtesy 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
      AF6-1 (+SL) - Body ground Always 1 MΩ or higher
      AF6-2 (-SL) - Body ground Always 1 MΩ or higher
      TEXT IN ILLUSTRATION

      *1 Front Airbag Sensor LH
      *2 Center Airbag Sensor Assembly
      *3 Engine Room Main Wire
      *4 Instrument Panel Wire
      *5 Front view of wire harness connector
      (to Engine Room Main Wire)
      *6 Connector C

    NG → REPLACE INSTRUMENT PANEL WIRE 

    OK → REPLACE ENGINE ROOM MAIN WIRE 

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