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Home >> Toyota >> 2004 >> RAV4 Base, AWD, Standard >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Supplemental Restraint System - Diagnostics >> DTC B1905/74: Short in P/T Squib (RH) Circuit, DTC B1906/74 Open in P/T Squib (RH) Circuit, DTC B1907/74 Short in P/T Squib (RH) Circuit (to Ground), DTC B1908/74 Short in P/T Squib (RH) Circuit (to B+) >> Inspection Procedure
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Inspection Procedure

CAUTION: Be sure to perform the following procedures before troubleshooting to avoid unexpected airbag deployment.
  1. Turn the ignition switch to the LOCK position.
  2. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
  3. Disconnect the connectors from the airbag sensor assembly.
  4. Disconnect the connectors from the horn button assembly.
  5. Disconnect the connectors from the front passenger airbag assembly.
  6. Disconnect the connector from the front seat airbag assembly LH.
  7. Disconnect the connector from the front seat airbag assembly RH.
  8. Disconnect the connector from the curtain shield airbag assembly LH.
  9. Disconnect the connector from the curtain shield airbag assembly RH.
  10. Disconnect the connector from the front seat outer belt assembly LH.
  11. Disconnect the connector from the front seat outer belt assembly RH.
  1. Check read method of DTC. 

    CHECK: 

    If using the hand-held tester (read the 5-digit code of DTC): Using the hand-held tester, check the DTCs (see PRE-CHECK  ).

    RESULT: 

    1. DTC B1905 is output. 
    2. DTC B1906 is output. 
    3. DTC B1907 is output. 
    4. DTC B1908 is output. 

    CHECK: 

    If not using the hand-held tester (read the 2-digit code of DTC): Check the DTCs (see PRE-CHECK  ).

    RESULT: 

    DTC 74 is output. 

    1. B: Go to step   4 . 
    2. C: Go to step   5 . 
    3. D: Go to step   6 . 
    4. E: Go to step   7 . 
    5. A: Go to next step. 
  2. Check connector. 

    CHECK: 

    Check that the floor No. 1 wire connector (on the front seat outer belt assembly RH side) is not damaged.

    OK: 

    The lock button is not disengaged, or the claw of the lock is not deformed or damaged. 

    1. NG: Repair or replace floor No. 1 wire. 
    2. OK: Go to next step. 
  3. Check floor No. 1 wire (short). 

    PREPARATION: 

    Release the activation prevention mechanism built into connector "B" (see PRE-CHECK  ).

    CHECK: 

    Measure the resistance according to IDENTIFYING FLOOR NO. 1 WIRE (SHORT) CONDITIONS .

    Fig 1: Checking Floor No. 1 Wire (Short)
    G02913347Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: 

    IDENTIFYING FLOOR NO. 1 WIRE (SHORT) CONDITIONS

    Tester Connection Condition Specified Condition
    P19-1 (PP+) - P19-2 (PP-) Always 1 MΩ or higher
    1. NG: Repair or replace floor No. 1 wire. 
    2. OK: Go to step   10 . 
  4. Check floor No. 1 wire (open). 

    CHECK: 

    Measure the resistance according to IDENTIFYING FLOOR NO. 1 WIRE (OPEN) CONDITIONS .

    Fig 2: Checking Floor No. 1 Wire (Open)
    G02913348Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: 

    IDENTIFYING FLOOR NO. 1 WIRE (OPEN) CONDITIONS

    Tester Connection Condition Specified Condition
    P19-1 (PP+) - P19-2 (PP-) Always Below 1 Ω
    1. NG: Repair or replace floor No. 1 wire. 
    2. OK: Go to step   11 . 
  5. Check floor No. 1 wire (to ground). 

    CHECK: 

    Measure the resistance according to IDENTIFYING FLOOR NO. 1 WIRE (TO GROUND) CONDITIONS .

    Fig 3: Checking Floor No. 1 Wire (To Ground)
    G02913349Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: 

    IDENTIFYING FLOOR NO. 1 WIRE (TO GROUND) CONDITIONS

    Tester Connection Condition Specified Condition
    P19-1 (PP+) - Body ground Always 1 MΩ or higher
    P19-2 (PP-) - Body ground Always 1 MΩ or higher
    1. NG: Repair or replace floor No. 1 wire. 
    2. OK: Go to step   11 . 
  6. Check floor No. 1 wire (to +B). 

    PREPARATION: 

    Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

    CHECK: 

    Measure the voltage according to IDENTIFYING FLOOR NO. 1 WIRE (TO +B) CONDITIONS .

    Fig 4: Checking Floor No. 1 Wire (To +B)
    G02913350Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: 

    IDENTIFYING FLOOR NO. 1 WIRE (TO +B) CONDITIONS

    Tester Connection Condition Specified Condition
    P19-1 (PP+) - Body ground Ignition switch ON Below 1V
    P19-2 (PP-) - Body ground Ignition switch ON Below 1V
    1. NG: Repair or replace floor No. 1 wire. 
    2. OK: Go to step   11 . 
  7. Check connector. 

    CHECK: 

    Check that the floor No. 1 wire connector (on the front seat outer belt assembly RH side) is not damaged.

    OK: 

    The lock button is not disengaged, or the claw of the lock is not deformed or damaged. 

    1. NG: Repair or replace floor No. 1 wire. 
    2. OK: Go to next step. 
  8. Check floor No. 1 wire (PT squib RH circuit). 

    PREPARATION: 

    Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

    CHECK: 

    Measure the voltage according to IDENTIFYING FLOOR NO. 1 WIRE (PT SQUIB RH CIRCUIT) CONDITIONS .

    Fig 5: Checking Floor No. 1 Wire (PT Squib RH Circuit)
    G02913351Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: 

    IDENTIFYING FLOOR NO. 1 WIRE (PT SQUIB RH CIRCUIT) CONDITIONS

    Tester Connection Condition Specified Condition
    P19-1 (PP+) - Body ground Ignition switch ON Below 1V
    P19-2 (PP-) - Body ground Ignition switch ON Below 1V

    PREPARATION: 

    1. Turn the ignition switch to the LOCK position.
    2. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.

    CHECK: 

    Measure the resistance according to IDENTIFYING FLOOR NO. 1 WIRE (PT SQUIB RH CIRCUIT) CONDITIONS .

    OK: 

    IDENTIFYING FLOOR NO. 1 WIRE (PT SQUIB RH CIRCUIT) CONDITIONS

    Tester Connection Condition Specified Condition
    P19-1 (PP+) - P19-2 (PP-) Always Below 1 Ω
    P19-1 (PP+) - Body ground Always 1 MΩ or higher
    P19-2 (PP-) - Body ground Always 1 MΩ or higher

    PREPARATION: 

    Release the activation prevention mechanism built into connector "B" (see PRE-CHECK  ).

    CHECK: 

    Measure the resistance according to IDENTIFYING FLOOR NO. 1 WIRE (PT SQUIB RH CIRCUIT) CONDITIONS .

    OK: 

    IDENTIFYING FLOOR NO. 1 WIRE (PT SQUIB RH CIRCUIT) CONDITIONS

    Tester Connection Condition Specified Condition
    P19-1 (PP+) - P19-2 (PP-) Always 1 MΩ or higher
    1. NG: Repair or replace floor No. 1 wire. 
    2. OK: Go to next step. 
  9. Replace front seat outer belt assembly RH (PT squib RH). 

    PREPARATION: 

    1. Replace the front seat outer belt assembly RH (see REPLACEMENT ).
    2. Connect the connectors to the airbag sensor assembly.
    3. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
    4. Turn the ignition switch to the ON position, and wait for at least 60 seconds.
    5. Clear the DTCs stored in memory (see PRE-CHECK  ).
    6. Turn the ignition switch to the LOCK position.

    CHECK: 

    1. Turn the ignition switch to the ON position, and wait for at least 60 seconds.
    2. Check the DTCs (see PRE-CHECK  ).
      3. Fig 6: Replacing Front Seat Outer Belt Assembly RH (PT Squib RH)
      G02913352Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: 

    DTC 74 is not output. 

    HINT:

    Codes other than DTC 74 may be output at this time, but they are not related to this check.

    1. NG: Replace airbag sensor assembly. 
    2. OK: END. 
  10. Check airbag sensor assembly. 

    PREPARATION: 

    1. Connect the connectors to the airbag sensor assembly.
    2. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
    3. Turn the ignition switch to the ON position, and wait for at least 60 seconds.
    4. Clear the DTCs stored in memory (see PRE-CHECK  ).
    5. Turn the ignition switch to the LOCK position.

    CHECK: 

    1. Turn the ignition switch to the ON position, and wait for at least 60 seconds.
    2. Check the DTCs (see PRE-CHECK  ).
      3. Fig 7: Checking Airbag Sensor Assembly
      G02913353Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: 

    DTC B1905 is not output. 

    HINT:

    Codes other than DTC B1905 may be output at this time, but they are not related to this check.

    1. NG: Replace airbag sensor assembly. 
    2. OK: Go to step   12 . 
  11. Check airbag sensor assembly. 

    PREPARATION: 

    1. from the step 6:

      Turn the ignition switch to the LOCK position.

    2. from the step 6:

      Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.

    3. Connect the connectors to the airbag sensor assembly.
    4. Using a service wire, connect terminals P19-1 (PP+) and P19-2 (PP-) of connector "C".
      NOTE:
      • Twist the end of the service wire in order to insert it into the connector.
      • Do not forcibly insert the twisted service wire into the terminals of the connector when connecting.
    5. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
    6. Turn the ignition switch to the ON position, and wait for at least 60 seconds.
    7. Clear the DTCs stored in memory (see PRE-CHECK  ).
    8. Turn the ignition switch to the LOCK position.

    CHECK: 

    1. Turn the ignition switch to the ON position, and wait for at least 60 seconds.
    2. Check the DTCs (see PRE-CHECK  ).
      3. Fig 8: Checking Airbag Sensor Assembly
      G02913354Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: DTCs B1906, B1907 and B1908 are not output. 

    HINT:

    Codes other than DTCs B1906, B1907 and B1908 may be output at this time, but they are not related to this check.

    1. NG: Replace airbag sensor assembly. 
    2. OK: Go to next step. 
  12. Check front seat outer belt assembly RH (P/T squib RH). 

    PREPARATION: 

    1. Turn the ignition switch to the LOCK position.
    2. Disconnect the negative (-) terminal cable from the battery, and wait at least for 90 seconds.
    3. from the step 10:

      Disconnect the service wire from connector "C".

    4. Connect the connector to the front seat outer belt assembly RH.
    5. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
    6. Turn the ignition switch to the ON position, and wait for at least 60 seconds.
    7. Clear the DTCs stored in memory (see PRE-CHECK  ).
    8. Turn the ignition switch to the LOCK position.

    CHECK: 

    1. Turn the ignition switch to the ON position, and wait for at least 60 seconds.
    2. Check the DTCs (see PRE-CHECK  ).
      3. Fig 9: Checking Front Seat Outer Belt Assembly RH (P/T Squib RH)
      G02913355Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: DTCs B1906, B1907 and B1908 are not output. 

    HINT:

    Codes other than DTCs B1906, B1907 and B1908 may be output at this time, but they are not related to this check.

    1. NG: Replace front seat outer belt assembly RH. 
    2. OK: from results of above inspection, suspected part can now be considered normal. To make sure of this, use simulation method to check. 

    HINT:

    • Before performing the simulation method, check that the airbag sensor assembly is in check mode (see PRE-CHECK  ).
    • Perform the simulation method by selecting the check mode using the hand-held tester (see PRE-CHECK  ).
    • After selecting the check mode, perform the simulation method by wiggling each connector of the airbag system or driving the vehicle on a city or rough road (see PRE-CHECK  ).
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