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Home >> Scion >> 2014 >> iQ EV >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Supplemental Restraint System (Diagnostic Codes B1693/81 - B1907/74 & Symptom Tests) (Electric) >> Airbag System >> DTC B1805/52: Short in Front Passenger Side Squib Circuit; DTC B1806/52: Open in Front Passenger Side Squib Circuit; DTC B1807/52: Short to GND in Front Passenger Side Squib Circuit; DTC B1808/52: Short to B+ in Front Passenger Side Squib Circuit >> Procedure

DTC B1805/52: Short in Front Passenger Side Squib Circuit; DTC B1806/52: Open in Front Passenger Side Squib Circuit; DTC B1807/52: Short to GND in Front Passenger Side Squib Circuit; DTC B1808/52: Short to B+ in Front Passenger Side Squib Circuit: Procedure

  1. CHECK CONNECTORS 
    1. Turn the power switch off.
      Fig 1: Identifying Instrument Panel Passenger Without Door Airbag Assembly, Airbag ECU Assembly, No. 2 Instrument Panel Wire & Instrument Panel Wire Circuit
      GTY388357Courtesy 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. Check that the connectors are properly connected to the instrument panel passenger without door airbag assembly and airbag ECU assembly. Also check that the connectors that link the instrument panel wire and No. 2 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 instrument panel passenger without door airbag assembly and airbag ECU assembly. Also disconnect the instrument panel wire from the No. 2 instrument panel wire.
    5. Check that the terminals of the connectors are not damaged.

      OK

      The terminals are not deformed or damaged.

    6. Check that the No. 2 instrument panel wire connector (on the instrument panel passenger without door airbag assembly side) is not damaged.

      OK

      The lock 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 No. 2 instrument panel wire with the activation prevention mechanism are not deformed or damaged.

      OK

      The short springs are not deformed or damaged.

      TEXT IN ILLUSTRATION

      *1 Instrument Panel Passenger without Door Airbag Assembly
      *2 Airbag ECU Assembly
      *3 No. 2 Instrument Panel Wire
      *4 Instrument Panel Wire

    NG → REPLACE WIRE HARNESS 

    OK: Go to next step 

  2. CHECK INSTRUMENT PANEL PASSENGER WITHOUT DOOR AIRBAG ASSEMBLY (FRONT PASSENGER SIDE SQUIB) 
    • SST: 09843-18061 
    1. Connect the instrument panel wire to the No. 2 instrument panel wire and airbag ECU assembly.
      Fig 2: Identifying Instrument Panel Passenger Without Door Airbag Assembly Connector Terminals
      GTY391045Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect SST (resistance 2.1 Ω) to connector E.
      WARNING:

      Never connect the tester to the instrument panel passenger without door airbag assembly (front passenger 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.
      • Insert SST straight into the terminals of the connector.
    3. Connect the cable to the negative (-) auxiliary battery terminal.
    4. Turn the power 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 power switch off.
    7. Turn the power switch on (IG), and wait for at least 60 seconds.
    8. Check for DTCs. Refer to DTC CHECK / CLEAR .

      OK

      DTC B1805/52, B1806/52, B1807/52 or B1808/52 is not output.

      HINT: 

      Codes other than DTCs B1805/52, B1806/52, B1807/52 and B1808/52 may be output at this time, but they are not related to this check.

    9. Turn the power switch off.
    10. 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.

    11. Disconnect SST from connector E.
      TEXT IN ILLUSTRATION

      *1 Instrument Panel Passenger without Door Airbag Assembly
      *2 Airbag ECU Assembly
      *a Front view of wire harness connector
      (to Instrument Panel Passenger without Door Airbag Assembly)

    NG → See step   3 

    OK → See step   7 

  3. CHECK FRONT PASSENGER SIDE SQUIB CIRCUIT 
    1. Disconnect the instrument panel wire from the airbag ECU assembly.
      Fig 3: Measuring Voltage Of Instrument Panel Passenger Without Door Airbag Assembly Connector
      GTY388270Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check for a short to B+ in the circuit.
      1. Connect the cable to the negative (-) auxiliary battery terminal.
      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
        N1-1 (P-) - Body ground Power switch on (IG) Below 1 V
        N1-2 (P+) - 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.

    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
        N1-1 (P-) - N1-2 (P+) 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
        N1-1 (P-) - Body ground Always 1 MΩ or higher
        N1-2 (P+) - 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 .
      2. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Condition Specified Condition
        N1-1 (P-) - N1-2 (P+) Always 1 MΩ or higher
    6. Restore the released activation prevention mechanism of connector B to the original condition.
      TEXT IN ILLUSTRATION

      *1 Instrument Panel Passenger without Door Airbag Assembly
      *2 Airbag ECU Assembly
      *a Front view of wire harness connector
      (to Instrument Panel Passenger without Door Airbag Assembly)

    NG → See step   5 

    OK: Go to next step 

  4. CHECK DTC 
    1. Connect the connectors to the instrument panel passenger without door airbag assembly and airbag ECU assembly.
    2. Connect the cable to the negative (-) auxiliary battery terminal.
    3. Turn the power switch on (IG), and wait for at least 60 seconds.
    4. Clear the DTCs stored in the 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 .

      OK

      DTC B1805/52, B1806/52, B1807/52 or B1808/52 is not output.

      HINT: 

      Codes other than DTCs B1805/52, B1806/52, B1807/52 and B1808/52 may be output at this time, but they are not related to this check.

    NG → See step   9 

    OK → See step   10 

  5. CHECK INSTRUMENT PANEL WIRE 
    1. Disconnect the No. 2 instrument panel wire from the instrument panel wire.
      Fig 4: Measuring Voltage Of No. 2 Instrument Panel Wire Connector
      GTY389672Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check for a short to B+ in the circuit.
      1. Connect the cable to the negative (-) auxiliary battery terminal.
      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
        CN2-1 (P+) - Body ground Power switch on (IG) Below 1 V
        CN2-2 (P-) - 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.

    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
        CN2-1 (P+) - CN2-2 (P-) 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
        CN2-1 (P+) - Body ground Always 1 MΩ or higher
        CN2-2 (P-) - 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 .
      2. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Condition Specified Condition
        CN2-1 (P+) - CN2-2 (P-) Always 1 MΩ or higher
    6. Restore the released activation prevention mechanism of connector B to the original condition.
      TEXT IN ILLUSTRATION

      *1 Instrument Panel Passenger without Door Airbag Assembly
      *2 Airbag ECU Assembly
      *3 No. 2 Instrument Panel Wire
      *4 Instrument Panel Wire
      *a Front view of wire harness connector
      (to No. 2 Instrument Panel Wire)

    NG → REPLACE INSTRUMENT PANEL WIRE 

    OK: Go to next step 

  6. CHECK NO. 2 INSTRUMENT PANEL WIRE 
    1. Check for a short to B+ in the circuit.
      Fig 5: Measuring Voltage Of Instrument Panel Passenger Without Door Airbag Assembly Connector
      GTY389386Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Connect the cable to the negative (-) auxiliary battery terminal.
      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
        N1-1 (P-) - Body ground Power switch on (IG) Below 1 V
        N1-2 (P+) - 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.

    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
        N1-1 (P-) - N1-2 (P+) 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
        N1-1 (P-) - Body ground Always 1 MΩ or higher
        N1-2 (P+) - 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 .
      2. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Condition Specified Condition
        N1-1 (P-) - N1-2 (P+) Always 1 MΩ or higher
    5. Restore the released activation prevention mechanism of connector D to the original condition.
      TEXT IN ILLUSTRATION

      *1 Instrument Panel Passenger without Door Airbag Assembly
      *2 Airbag ECU Assembly
      *3 No. 2 Instrument Panel Wire
      *4 Instrument Panel Wire
      *a Front view of wire harness connector
      (to Instrument Panel Passenger without Door Airbag Assembly)

    NG → See step   8 

    OK → See step   10 

  7. REPLACE INSTRUMENT PANEL PASSENGER WITHOUT DOOR AIRBAG ASSEMBLY. Refer to  REMOVAL 
  8. REPLACE NO. 2 INSTRUMENT PANEL WIRE. Refer to  REMOVAL 
  9. REPLACE AIRBAG ECU ASSEMBLY. Refer to  REMOVAL 
  10. USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING 
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