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Home >> Toyota >> 2014 >> Avalon XLE >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Supplemental Restraint System (Diagnostic Codes & Symptom Tests) (Except Hybrid) >> Airbag System >> DTC B1800/51: Short in Driver Side Squib Circuit; DTC B1801/51: Open in Driver Side Squib Circuit; DTC B1802/51: Short to GND in Driver Side Squib Circuit; DTC B1803/51: Short to B+ in Driver Side Squib Circuit [10/2013 - ] >> Procedure

DTC B1800/51: Short in Driver Side Squib Circuit; DTC B1801/51: Open in Driver Side Squib Circuit; DTC B1802/51: Short to GND in Driver Side Squib Circuit; DTC B1803/51: Short to B+ in Driver Side Squib Circuit [10/2013 - ]: Procedure

  1. CHECK CONNECTORS 
    1. Turn the engine switch off.
      GTY323372Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the cable from the negative (-) battery terminal.
      WARNING:

      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 horn button assembly, spiral cable with sensor sub-assembly and airbag ECU assembly.

      OK

      The connectors are properly connected.

      HINT: 

      If the connectors are not properly connected, reconnect the connectors and proceed to the next inspection.

    4. Disconnect the connectors from the horn button assembly, spiral cable with sensor sub-assembly and airbag ECU assembly.
    5. Check that the terminals of the connectors are not damaged.

      OK

      The terminals are not deformed or damaged.

    6. Check that the spiral cable with sensor sub-assembly connector (on the horn button assembly side) is not damaged.

      OK

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

    7. Check that the short springs for the instrument panel wire and spiral cable with sensor sub-assembly with the activation prevention mechanism are not deformed or damaged.

      OK

      The short springs are not deformed or damaged.

      TEXT IN ILLUSTRATION

      *1 Horn Button Assembly
      *2 Spiral Cable with Sensor Sub-assembly
      *3 Airbag ECU Assembly
      *4 Instrument Panel Wire

    NG → REPLACE WIRE HARNESS 

    OK: Go to next step 

  2. CHECK HORN BUTTON ASSEMBLY (DRIVER SIDE SQUIB) 
    1. Connect the instrument panel wire to the airbag ECU assembly and spiral cable with sensor sub-assembly.
      GTY372130Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect SST (resistance 2.1 Ω) to connector E (orange connector).
      WARNING:

      Never connect a tester to the horn button assembly (driver side squib) for measurement, as this may lead to a serious injury due to airbag deployment.

      NOTE:
      • Do not forcibly insert SST into the terminals of the connector when connecting it.
      • Insert SST straight into the terminals of the connector.
      • SST: 09843-18061 
    3. Connect the cable to the negative (-) battery terminal.
    4. Clear the DTCs stored in memory. Refer to DTC CHECK / CLEAR [10/2013 - ] .
    5. Turn the engine switch off.
    6. Turn the engine switch on (IG), and wait for at least 60 seconds.
    7. Check for DTCs. Refer to DTC CHECK / CLEAR [10/2013 - ] .

      OK

      DTC B1800/51, B1801/51, B1802/51 or B1803/51 is not output.

      HINT: 

      Codes other than DTCs B1800/51, B1801/51, B1802/51 and B1803/51 may be output at this time, but they are not related to this check.

    8. Turn the engine switch off.
    9. Disconnect the cable from the negative (-) battery terminal.
      WARNING:

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

    10. Disconnect SST from connector E.
      TEXT IN ILLUSTRATION

      *1 Horn Button Assembly
      *2 Spiral Cable with Sensor Sub-assembly
      *3 Airbag ECU Assembly
      *a Front view of wire harness connector
      (to Horn Button Assembly)
      *b Color: Orange

    NG → See step   3 

    OK → See step   7 

  3. CHECK DRIVER SIDE SQUIB CIRCUIT 
    1. Disconnect the instrument panel wire from the airbag ECU assembly.
      GTY375111Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check for a short to B+ in the circuit.
      1. Connect the cable to the negative (-) battery terminal.
      2. Turn the engine switch on (IG).
      3. Measure the voltage according to the value(s) in the table below.

        Standard Voltage

        Tester Connection Condition Specified Condition
        z5-2 (D+) - Body ground Engine switch on (IG) Below 1 V
        z5-1 (D-) - Body ground Engine switch on (IG) Below 1 V
      4. Turn the engine switch off.
      5. Disconnect the cable from the negative (-) battery terminal.
        WARNING:

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

    3. Check for an open in the circuit.
      1. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Condition Specified Condition
        z5-2 (D+) - z5-1 (D-) Always Below 1 Ω
    4. Check for a short to ground in the circuit.
      1. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Condition Specified Condition
        z5-2 (D+) - Body ground Always 1 MΩ or higher
        z5-1 (D-) - Body ground Always 1 MΩ or higher
    5. Check for a short in the circuit.
      1. Release the activation prevention mechanism built into connector B. Refer to DIAGNOSIS SYSTEM [10/2013 - ] .
      2. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Condition Specified Condition
        z5-2 (D+) - z5-1 (D-) Always 1 MΩ or higher
      3. Restore the released activation prevention mechanism of connector B to the original condition.
        TEXT IN ILLUSTRATION

        *1 Horn Button Assembly
        *2 Spiral Cable with Sensor Sub-assembly
        *3 Airbag ECU Assembly
        *a Front view of wire harness connector
        (to Horn Button Assembly)
        *b Color: Orange

    NG → See step   5 

    OK: Go to next step 

  4. CHECK DTC 
    1. Connect the connectors to the horn button assembly and airbag ECU assembly.
      GTY317852Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect the cable to the negative (-) battery terminal.
    3. Clear the DTCs stored in memory. Refer to DTC CHECK / CLEAR [10/2013 - ] .
    4. Turn the engine switch off.
    5. Turn the engine switch on (IG), and wait for at least 60 seconds.
    6. Check for DTCs. Refer to DTC CHECK / CLEAR [10/2013 - ] .

      OK

      DTC B1800/51, B1801/51, B1802/51 or B1803/51 is not output.

      HINT: 

      Codes other than DTCs B1800/51, B1801/51, B1802/51 and B1803/51 may be output at this time, but they are not related to this check.

      TEXT IN ILLUSTRATION

      *1 Horn Button Assembly
      *2 Spiral Cable with Sensor Sub-assembly
      *3 Airbag ECU Assembly

    NG → See step   9 

    OK → See step   10 

  5. CHECK INSTRUMENT PANEL WIRE 
    1. Disconnect the instrument panel wire from the spiral cable with sensor sub-assembly.
      GTY381041Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check for a short to B+ in the circuit.
      1. Connect the cable to the negative (-) battery terminal.
      2. Turn the engine switch on (IG).
      3. Measure the voltage according to the value(s) in the table below.

        Standard Voltage

        Tester Connection Condition Specified Condition
        D19-1 (D+) - Body ground Engine switch on (IG) Below 1 V
        D19-2 (D-) - Body ground Engine switch on (IG) Below 1 V
      4. Turn the engine switch off.
      5. Disconnect the cable from the negative (-) battery terminal.
        WARNING:

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

    3. Check for an open in the circuit.
      1. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Condition Specified Condition
        D19-1 (D+) - D19-2 (D-) Always Below 1 Ω
    4. Check for a short to ground in the circuit.
      1. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Condition Specified Condition
        D19-1 (D+) - Body ground Always 1 MΩ or higher
        D19-2 (D-) - Body ground Always 1 MΩ or higher
    5. Check for a short in the circuit.
      1. Release the activation prevention mechanism built into connector B. Refer to DIAGNOSIS SYSTEM [10/2013 - ] .
      2. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Condition Specified Condition
        D19-1 (D+) - D19-2 (D-) Always 1 MΩ or higher
      3. Restore the released activation prevention mechanism of connector B to the original condition.
        TEXT IN ILLUSTRATION

        *1 Horn Button Assembly
        *2 Spiral Cable with Sensor Sub-assembly
        *3 Airbag ECU Assembly
        *4 Instrument Panel Wire
        *a Front view of wire harness connector
        (to Spiral Cable with Sensor Sub-assembly)

    NG → REPLACE INSTRUMENT PANEL WIRE 

    OK: Go to next step 

  6. CHECK SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY 
    1. Check for a short to B+ in the circuit.
      GTY369930Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Connect the cable to the negative (-) battery terminal.
      2. Turn the engine switch on (IG).
      3. Measure the voltage according to the value(s) in the table below.

        Standard Voltage

        Tester Connection Condition Specified Condition
        z5-2 (D+) - Body ground Engine switch on (IG) Below 1 V
        z5-1 (D-) - Body ground Engine switch on (IG) Below 1 V
      4. Turn the engine switch off.
      5. Disconnect the cable from the negative (-) battery terminal.
        WARNING:

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

    2. Check for an open in the circuit.
      1. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Condition Specified Condition
        z5-2 (D+) - z5-1 (D-) Always Below 1 Ω
    3. Check for a short to ground in the circuit.
      1. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Condition Specified Condition
        z5-2 (D+) - Body ground Always 1 MΩ or higher
        z5-1 (D-) - Body ground Always 1 MΩ or higher
    4. Check for a short in the circuit.
      1. Release the activation prevention mechanism built into connector D. Refer to DIAGNOSIS SYSTEM [10/2013 - ] .
      2. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Condition Specified Condition
        z5-2 (D+) - z5-1 (D-) Always 1 MΩ or higher
      3. Restore the released activation prevention mechanism of connector D to the original condition.
        TEXT IN ILLUSTRATION

        *1 Horn Button Assembly
        *2 Spiral Cable with Sensor Sub-assembly
        *3 Airbag ECU Assembly
        *4 Instrument Panel Wire
        *a Front view of wire harness connector
        (to Horn Button Assembly)
        *b Color: Orange

    NG → See step   8 

    OK → See step   10 

  7. REPLACE HORN BUTTON ASSEMBLY. Refer to  REMOVAL [10/2013 - ] 
  8. REPLACE SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY. Refer to  REMOVAL [10/2013 - ] 
  9. REPLACE AIRBAG ECU ASSEMBLY. Refer to  REMOVAL [10/2013 - ] 
  10. USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2013 - ] 
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