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Home >> Lexus >> 2012 >> CT 200h F Sport >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Airbag System (Diagnostic Codes (B1650/32 - B1905/74) & Symptom Tests) >> Airbag System >> DTC B1660/43: Passenger Airbag ON/OFF Indicator Circuit Malfunction >> Procedure

DTC B1660/43: Passenger Airbag ON/OFF Indicator Circuit Malfunction: Procedure

  1. CHECK PASSENGER AIRBAG ON/OFF INDICATOR CONDITION 
    1. Turn the power switch on (IG).
    2. Check the passenger airbag ON/OFF indicator operation.

      Result

      ON/OFF Indicator Illumination Proceed to
      Always ON A
      OFF B

      HINT: 

      Refer to the normal condition of the passenger airbag ON/OFF indicator. Refer to DIAGNOSIS SYSTEM .

    B → See step   9 

    A: 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 sensor assembly and combination switch assembly.

      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 sensor assembly and combination switch assembly.
    5. Check that the terminals of the connectors are not damaged.

      OK

      The terminals are not deformed or damaged.

    NG → REPLACE INSTRUMENT PANEL WIRE 

    OK: Go to next step 

  3. CHECK PASSENGER AIRBAG ON/OFF INDICATOR 
    1. Connect the connector to the combination switch assembly.
    2. Connect the cable to the negative (-) auxiliary battery terminal.
    3. Turn the power switch on (IG).
    4. Check the passenger airbag ON/OFF indicator operation.

      OK

      The passenger airbag ON/OFF indicator does not come on.

    NG → See step   5 

    OK: Go to next step 

  4. CHECK AIRBAG SENSOR ASSEMBLY 
    1. Turn the power switch off.
      Fig 1: Identifying Side Airbag Sensor LH (For Rear Side)
      GTY244367Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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. Connect the connector to the airbag sensor assembly.
    4. Connect the cable to the negative (-) auxiliary battery terminal.
    5. Turn the power switch on (IG), and wait for at least 60 seconds.
    6. Clear the DTCs stored in memory. Refer to DTC CHECK / CLEAR .
    7. Turn the power switch off.
    8. Turn the power switch on (IG), and wait for at least 60 seconds.
    9. Check for DTCs. Refer to DTC CHECK / CLEAR .

      OK

      DTC B1660/43 is not output.

      TEXT IN ILLUSTRATION

      *1 Combination Switch Assembly
      *2 Airbag Sensor Assembly

      HINT: 

      Codes other than DTC B1660/43 may be output at this time, but they are not related to this check.

    NG → See step   17 

    OK → See step   19 

  5. CHECK INSTRUMENT PANEL WIRE (OPEN) 
    1. Turn the power switch off.
      Fig 2: Identifying H84 And H72 Connector Terminals
      GTY356994Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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. Disconnect the connector from the combination switch assembly.
    4. Using SST, connect terminals 23 (PAON) and 17 (P-AB) of connector B.
      NOTE:

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

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      H72-19 (PAON) - H72-20 (P-AB) Always Below 1 Ω
      TEXT IN ILLUSTRATION

      *1 Combination Switch Assembly *2 Airbag Sensor Assembly
      *3 Instrument Panel Wire *4 Connector B
      *5 Connector C - -
      *a Front view of wire harness connector
      (to Airbag Sensor Assembly)      		 *b Front view of wire harness connector
      (to Combination Switch Assembly)

    NG → REPLACE INSTRUMENT PANEL WIRE 

    OK: Go to next step 

  6. CHECK INSTRUMENT PANEL WIRE (SHORT) 
    1. Disconnect SST from connector B.
      Fig 3: Identifying H72 Connector Terminals
      GTY351750Courtesy 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
      H72-19 (PAON) - H72-20 (P-AB) Always 1 MΩ or higher
      TEXT IN ILLUSTRATION

      *1 Combination Switch Assembly
      *2 Airbag Sensor Assembly
      *3 Instrument Panel Wire
      *4 Connector C
      *a Front view of wire harness connector
      (to Combination Switch Assembly)

    NG → REPLACE INSTRUMENT PANEL WIRE 

    OK: Go to next step 

  7. CHECK INSTRUMENT PANEL WIRE (SHORT TO GROUND) 
    1. Measure the resistance according to the value(s) in the table below.
      Fig 4: Identifying H72 Connector Terminals
      GTY351750Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      H72-19 (PAON) - Body ground Always 1 MΩ or higher
      H72-20 (P-AB) - Body ground Always 1 MΩ or higher
      TEXT IN ILLUSTRATION

      *1 Combination Switch Assembly
      *2 Airbag Sensor Assembly
      *3 Instrument Panel Wire
      *4 Connector C
      *a Front view of wire harness connector
      (to Combination Switch Assembly)

    NG → REPLACE INSTRUMENT PANEL WIRE 

    OK: Go to next step 

  8. CHECK INSTRUMENT PANEL WIRE (SHORT TO B+) 
    1. Connect the cable to the negative (-) auxiliary battery terminal.
      Fig 5: Identifying H72 Connector Terminals
      GTY351750Courtesy 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
      H72-19 (PAON) - Body ground Power switch on (IG) Below 1 V
      H72-20 (P-AB) - Body ground Power switch on (IG) Below 1 V
      TEXT IN ILLUSTRATION

      *1 Combination Switch Assembly
      *2 Airbag Sensor Assembly
      *3 Instrument Panel Wire
      *4 Connector C
      *a Front view of wire harness connector
      (to Combination Switch Assembly)

    NG → REPLACE INSTRUMENT PANEL WIRE 

    OK → See step   18 

  9. 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 sensor assembly and combination switch assembly.

      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 sensor assembly and combination switch assembly.
    5. Check that the terminals of the connectors are not damaged.

      OK

      The terminals are not deformed or damaged.

    NG → REPLACE INSTRUMENT PANEL WIRE 

    OK: Go to next step 

  10. CHECK INSTRUMENT PANEL WIRE (OPEN) 
    1. Using SST, connect terminals 23 (PAON) and 17 (P-AB) of connector B.
      Fig 6: Identifying H84 And H72 Connector Terminals
      GTY356994Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:

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

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      H72-19 (PAON) - H72-20 (P-AB) Always Below 1 Ω
      TEXT IN ILLUSTRATION

      *1 Combination Switch Assembly *2 Airbag Sensor Assembly
      *3 Instrument Panel Wire *4 Connector B
      *5 Connector C - -
      *a Front view of wire harness connector
      (to Airbag Sensor Assembly)      		 *b Front view of wire harness connector
      (to Combination Switch Assembly)

    NG → REPLACE INSTRUMENT PANEL WIRE 

    OK: Go to next step 

  11. CHECK INSTRUMENT PANEL WIRE (SHORT) 
    1. Disconnect SST from connector B.
      Fig 7: Identifying H72 Connector Terminals
      GTY351750Courtesy 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
      H72-19 (PAON) - H72-20 (P-AB) Always 1 MΩ or higher
      TEXT IN ILLUSTRATION

      *1 Combination Switch Assembly
      *2 Airbag Sensor Assembly
      *3 Instrument Panel Wire
      *4 Connector C
      *a Front view of wire harness connector
      (to Combination Switch Assembly)

    NG → REPLACE INSTRUMENT PANEL WIRE 

    OK: Go to next step 

  12. CHECK INSTRUMENT PANEL WIRE (SHORT TO GROUND) 
    1. Measure the resistance according to the value(s) in the table below.
      Fig 8: Identifying H72 Connector Terminals
      GTY351750Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      H72-19 (PAON) - Body ground Always 1 MΩ or higher
      H72-20 (P-AB) - Body ground Always 1 MΩ or higher
      TEXT IN ILLUSTRATION

      *1 Combination Switch Assembly
      *2 Airbag Sensor Assembly
      *3 Instrument Panel Wire
      *4 Connector C
      *a Front view of wire harness connector
      (to Combination Switch Assembly)

    NG → REPLACE INSTRUMENT PANEL WIRE 

    OK: Go to next step 

  13. CHECK INSTRUMENT PANEL WIRE (SHORT TO B+) 
    1. Connect the cable to the negative (-) auxiliary battery terminal.
      Fig 9: Identifying H72 Connector Terminals
      GTY351750Courtesy 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
      H72-19 (PAON) - Body ground Power switch on (IG) Below 1 V
      H72-20 (P-AB) - Body ground Power switch on (IG) Below 1 V
      TEXT IN ILLUSTRATION

      *1 Combination Switch Assembly
      *2 Airbag Sensor Assembly
      *3 Instrument Panel Wire
      *4 Connector C
      *a Front view of wire harness connector
      (to Combination Switch Assembly)

    NG → REPLACE INSTRUMENT PANEL WIRE 

    OK: Go to next step 

  14. CHECK COMBINATION SWITCH ASSEMBLY (SOURCE VOLTAGE) 
    1. Turn the power switch on (IG).
      Fig 10: Identifying H72 Connector Terminals
      GTY358629Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      H72-8 (B) - Body ground Power switch on (IG) 11 to 14 V
      TEXT IN ILLUSTRATION

      *1 Combination Switch Assembly
      *2 Airbag Sensor Assembly
      *3 Instrument Panel Wire
      *4 Connector C
      *a Front view of wire harness connector
      (to Combination Switch Assembly)

    NG → REPLACE WIRE HARNESS OR AUXILIARY BATTERY 

    OK: Go to next step 

  15. CHECK PASSENGER AIRBAG ON/OFF INDICATOR 
    1. Turn the power switch off.
      Fig 11: Identifying H84 Connector Terminals
      GTY348957Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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. Connect the connector to the combination switch assembly.
    4. Connect the cable to the negative (-) auxiliary battery terminal.
    5. Turn the power switch on (IG).
    6. Check the indicator according to the conditions in the table below.

      Result

      Tester Connection Switch Condition Specified Condition
      H84-23 (PAON) - Body ground Power switch on (IG) "ON" comes on
      H84-17 (P-AB) - Body ground Power switch on (IG) "OFF" comes on
      TEXT IN ILLUSTRATION

      *1 Combination Switch Assembly
      *2 Airbag Sensor Assembly
      *3 Instrument Panel Wire
      *4 Connector B
      *a Front view of wire harness connector
      (to Airbag Sensor Assembly)

    NG → See step   18 

    OK: Go to next step 

  16. CHECK AIRBAG SENSOR ASSEMBLY 
    1. Turn the power switch off.
      Fig 12: Identifying Center Airbag Sensor Assembly
      GTY262152Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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. Connect the connector to the airbag sensor assembly.
    4. Connect the cable to the negative (-) auxiliary battery terminal.
    5. Turn the power switch on (IG), and wait for at least 60 seconds.
    6. Clear the DTCs stored in memory. Refer to DTC CHECK / CLEAR .
    7. Turn the power switch off.
    8. Turn the power switch on (IG), and wait for at least 60 seconds.
    9. Check for DTCs. Refer to DTC CHECK / CLEAR .

      OK

      DTC B1660/43 is not output.

      TEXT IN ILLUSTRATION

      *1 Combination Switch Assembly
      *2 Airbag Sensor Assembly

      HINT: 

      Codes other than DTC B1660/43 may be output at this time, but they are not related to this check.

    NG → See step   17 

    OK → See step   19 

  17. REPLACE AIRBAG SENSOR ASSEMBLY. Refer to  REMOVAL 
  18. REPLACE COMBINATION SWITCH ASSEMBLY. Refer to  REMOVAL 
  19. USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING 
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