AIRBAG SYSTEM, Diagnostic DTC:B1985/92, B1986/92, B1987/92, B1988/92

DTC Code DTC Name
B1985/92 Short in Pop Up Hood Squib LH Circuit
B1986/92 Open in Pop Up Hood Squib LH Circuit
B1987/92 Short to GND in Pop Up Hood Squib LH Circuit
B1988/92 Short to B+ in Pop Up Hood Squib LH Circuit

DESCRIPTION

The pop up hood squib LH circuit consists of the airbag sensor assembly and pop up hood lifter assembly LH.

The airbag sensor assembly uses this circuit to deploy the pop up hood when deployment conditions are met.

These DTCs are stored when a malfunction is detected in the pop up hood squib LH circuit.

DTC No. Detection Item DTC Detection Condition Trouble Area Test Mode / Check Mode
B1985/92 Short in Pop Up Hood Squib LH Circuit

  • The airbag sensor assembly detects a line short in the pop up hood squib LH circuit during primary check.

  • Pop up hood squib LH malfunction

  • Airbag sensor assembly malfunction

  • No. 2 floor wire

  • Engine room main wire

  • Pop up hood squib LH (Pop up hood lifter assembly LH)

  • Airbag sensor assembly

 Applies to check mode
B1986/92 Open in Pop Up Hood Squib LH Circuit

  • The airbag sensor assembly detects an open in the pop up hood squib LH circuit.

  • Pop up hood squib LH malfunction

  • Airbag sensor assembly malfunction

  • No. 2 floor wire

  • Engine room main wire

  • Pop up hood squib LH (Pop up hood lifter assembly LH)

  • Airbag sensor assembly

 Applies to check mode
B1987/92 Short to GND in Pop Up Hood Squib LH Circuit

  • The airbag sensor assembly detects a short to ground in the pop up hood squib LH circuit.

  • Pop up hood squib LH malfunction

  • Airbag sensor assembly malfunction

  • No. 2 floor wire

  • Engine room main wire

  • Pop up hood squib LH (Pop up hood lifter assembly LH)

  • Airbag sensor assembly

 Applies to check mode
B1988/92 Short to B+ in Pop Up Hood Squib LH Circuit

  • The airbag sensor assembly detects a short to B+ in the pop up hood squib LH circuit.

  • Pop up hood squib LH malfunction

  • Airbag sensor assembly malfunction

  • No. 2 floor wire

  • Engine room main wire

  • Pop up hood squib LH (Pop up hood lifter assembly LH)

  • Airbag sensor assembly

 Applies to check mode

WIRING DIAGRAM

A002123E04

CAUTION / NOTICE / HINT

Note

After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.

Click here

Tech Tips


  • Perform the simulation method by selecting check mode (Signal Check) using the GTS.

    Click here

  • After selecting check mode (Signal Check), perform the simulation method by wiggling each connector of the airbag system or driving the vehicle on a city road or rough road.

    Click here

PROCEDURE


  1. CHECK CONNECTORS


    1. A0020ESC01
      *1 Pop Up Hood Lifter Assembly LH
      *2 Airbag Sensor Assembly
      *3 Engine Room Main Wire
      *4 No. 2 Floor Wire

      Turn the power switch off.

    2. Disconnect the cable from the negative (-) auxiliary battery terminal.

      CAUTION:

      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 pop up hood lifter assembly LH and airbag sensor assembly. Also check that the connectors that link the No. 2 floor wire and engine room main wire are properly connected.

      OK
      The connectors are properly connected.

      Tech Tips

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

    4. Disconnect the connectors from the pop up hood lifter assembly LH and airbag sensor assembly. Also disconnect the No. 2 floor wire from the engine room main wire.

    5. Check that the terminals of the connectors are not damaged.

      OK
      The terminals are not deformed or damaged.

    6. Check that the short springs for the No. 2 floor wire and engine room main wire with the activation prevention mechanism are not deformed or damaged.

      OK
      The short springs are not deformed or damaged.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE WIRE HARNESS

    OK

  2. CHECK POP UP HOOD LIFTER ASSEMBLY LH


    1. A00232LC01
      *1 Pop Up Hood Lifter Assembly LH
      *2 Airbag Sensor Assembly
      *a

      Front view of wire harness connector

      (to Pop Up Hood Lifter Assembly LH)

      Connect the No. 2 floor wire to the engine room main wire and airbag sensor assembly.

    2. Connect SST (resistance 2.1 Ω) to connector E.

      CAUTION:

      Never connect a tester to the pop up hood lifter assembly LH for measurement, as this may lead to a serious injury due to pop up hood 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 (-) auxiliary battery terminal.

    4. Clear the DTCs stored in memory.

      Click here


      Body Electrical > SRS Airbag > Clear DTCs

    5. Turn the power switch off.

    6. Turn the power switch on (IG), and wait for at least 60 seconds.

    7. Check for DTCs.

      Click here


      Body Electrical > SRS Airbag > Trouble Codes
      OK
      DTC B1985/92, B1986/92, B1987/92 or B1988/92 is not output.

      Tech Tips

      Codes other than DTCs B1985/92, B1986/92, B1987/92 and B1988/92 may be output at this time, but they are not related to this check.

    8. Turn the power switch off.

    9. Disconnect the cable from the negative (-) auxiliary battery terminal.

      CAUTION:

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

    10. Disconnect SST from connector E.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POP UP HOOD LIFTER ASSEMBLY LH Click here

    NG

  3. CHECK WIRE HARNESS


    1. A0020LGC02
      *1 Pop Up Hood Lifter Assembly LH
      *2 Airbag Sensor Assembly
      *a

      Front view of wire harness connector

      (to Pop Up Hood Lifter Assembly LH)

      Disconnect the No. 2 floor wire from the airbag sensor assembly.

    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 Condition Specified Condition
        A45-2 (PLL+) - Body ground Power switch on (IG) Below 1 V
        A45-1 (PLL-) - 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.

        CAUTION:

        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
        A45-2 (PLL+) - A45-1 (PLL-) 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
        A45-2 (PLL+) - Body ground Always 1 MΩ or higher
        A45-1 (PLL-) - 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.

        Click here

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        A45-2 (PLL+) - A45-1 (PLL-) Always 1 MΩ or higher

      3. Restore the released activation prevention mechanism of connector B to the original condition.

      Result
      Proceed to
      OK
      NG

    NG

    CHECK NO. 2 FLOOR WIRE Click here

    OK

  4. CHECK DTC


    1. A00239RC03
      *1 Pop Up Hood Lifter Assembly LH
      *2 Airbag Sensor Assembly

      Connect the connectors to the pop up hood lifter assembly LH and airbag sensor assembly.

    2. Connect the cable to the negative (-) auxiliary battery terminal.

    3. Clear the DTCs stored in memory.

      Click here


      Body Electrical > SRS Airbag > Clear DTCs

    4. Turn the power switch off.

    5. Turn the power switch on (IG), and wait for at least 60 seconds.

    6. Check for DTCs.

      Click here


      Body Electrical > SRS Airbag > Trouble Codes
      OK
      DTC B1985/92, B1986/92, B1987/92 or B1988/92 is not output.

      Tech Tips

      Codes other than DTCs B1985/92, B1986/92, B1987/92 and B1988/92 may be output at this time, but they are not related to this check.

      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE AIRBAG SENSOR ASSEMBLY Click here

  5. CHECK NO. 2 FLOOR WIRE


    1. A0022XAC02
      *1 Pop Up Hood Lifter Assembly LH
      *2 Airbag Sensor Assembly
      *3 Engine Room Main Wire
      *4 No. 2 Floor Wire
      *a

      Front view of wire harness connector

      (to Engine Room Main Wire)

      Disconnect the engine room main wire from the No. 2 floor wire.

    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 Condition Specified Condition
        AQ4-2 (PUL+) - Body ground Power switch on (IG) Below 1 V
        AQ4-3 (PUL-) - 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.

        CAUTION:

        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
        AQ4-2 (PUL+) - AQ4-3 (PUL-) 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
        AQ4-2 (PUL+) - Body ground Always 1 MΩ or higher
        AQ4-3 (PUL-) - 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.

        Click here

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        AQ4-2 (PUL+) - AQ4-3 (PUL-) Always 1 MΩ or higher

      3. Restore the released activation prevention mechanism of connector B to the original condition.

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  6. CHECK ENGINE ROOM MAIN WIRE


    1. A0021QMC02
      *1 Pop Up Hood Lifter Assembly LH
      *2 Airbag Sensor Assembly
      *3 Engine Room Main Wire
      *4 No. 2 Floor Wire
      *a

      Front view of wire harness connector

      (to Pop Up Hood Lifter Assembly LH)

      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 Condition Specified Condition
        A45-2 (PLL+) - Body ground Power switch on (IG) Below 1 V
        A45-1 (PLL-) - 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.

        CAUTION:

        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
        A45-2 (PLL+) - A45-1 (PLL-) 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
        A45-2 (PLL+) - Body ground Always 1 MΩ or higher
        A45-1 (PLL-) - 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.

        Click here

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        A45-2 (PLL+) - A45-1 (PLL-) Always 1 MΩ or higher

      3. Restore the released activation prevention mechanism of connector D to the original condition.

      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE ENGINE ROOM MAIN WIRE