PEDESTRIAN PROTECTION SYSTEM, Diagnostic DTC:B1995, B1996, B1997, B1998

DTC Code DTC Name
B1995 Short in Front Pop Up Hood Squib LH Circuit
B1996 Open in Front Pop Up Hood Squib LH Circuit
B1997 Short to GND in Front Pop Up Hood Squib LH Circuit
B1998 Short to B+ in Front Pop Up Hood Squib LH Circuit

DESCRIPTION

The pop up hood squib LH circuit consists of the pedestrian detection ECU assembly and No. 2 pop up hood lifter assembly LH.

The pedestrian detection ECU 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 Warning Indicate Test Mode / Check Mode
B1995 Short in Front Pop Up Hood Squib LH Circuit

One of the following conditions is met:


  • The pedestrian detection ECU assembly detects a line short circuit signal 5 times in the pop up hood squib LH circuit during the primary check.

  • A pop up hood squib LH malfunction

  • A pedestrian detection ECU assembly malfunction

  • Instrument panel wire

  • Engine room main wire

  • Pop up hood lifter assembly LH

  • Pedestrian detection ECU assembly

 Comes on Applicable
B1996 Open in Front Pop Up Hood Squib LH Circuit

One of the following conditions is met:


  • The pedestrian detection ECU assembly detects an open circuit signal in the pop up hood squib LH circuit for 2 seconds.

  • A pop up hood squib LH malfunction

  • A pedestrian detection ECU assembly malfunction

  • Instrument panel wire

  • Engine room main wire

  • Pop up hood lifter assembly LH

  • Pedestrian detection ECU assembly

 Comes on Applicable
B1997 Short to GND in Front Pop Up Hood Squib LH Circuit

One of the following conditions is met:


  • The pedestrian detection ECU assembly detects a short circuit to ground signal in the pop up hood squib LH circuit for 0.5 seconds.

  • A pop up hood squib LH malfunction

  • A pedestrian detection ECU assembly malfunction

  • Instrument panel wire

  • Engine room main wire

  • Pop up hood lifter assembly LH

  • Pedestrian detection ECU assembly

 Comes on Applicable
B1998 Short to B+ in Front Pop Up Hood Squib LH Circuit

One of the following conditions is met:


  • The pedestrian detection ECU assembly detects a short circuit to B+ signal in the pop up hood squib LH circuit for 0.5 seconds.

  • A pop up hood squib LH malfunction

  • A pedestrian detection ECU assembly malfunction

  • Instrument panel wire

  • Engine room main wire

  • Pop up hood lifter assembly LH

  • Pedestrian detection ECU assembly

 Comes on Applicable

WIRING DIAGRAM

B006G2LE21

CAUTION / NOTICE / HINT

Note


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

    Click here

  • When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected.

    Click here

Tech Tips

To perform the simulation method, enter check mode (signal check) with the GTS (Click here ), and then wiggle each connector of the pedestrian protection system or drive the vehicle on various types of road Click here.

PROCEDURE


  1. CHECK CONNECTORS


    1. B006FIVC01
      *1 Pop Up Hood Lifter Assembly LH
      *2 Pedestrian Detection ECU Assembly
      *3 Engine Room Main Wire
      *4 Instrument Panel Wire

      Turn the engine switch off.

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

    3. Check that the connectors are properly connected to the instrument panel wire, pedestrian detection ECU assembly and pop up hood lifter assembly LH.

      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 instrument panel wire, pedestrian detection ECU assembly and pop up hood lifter assembly LH.

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

      OK
      The terminals are not deformed or damaged.

    6. Check that the engine room main wire connector (on the pop up hood lifter assembly LH side) is not loose, deformed or damaged.

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

    7. Check that the short springs of the activation prevention mechanisms of the instrument panel wire and engine room main wire connector are not deformed or damaged.

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

    NG

    REPLACE ENGINE ROOM MAIN WIRE OR INSTRUMENT PANEL WIRE

    OK

  2. CHECK POP UP HOOD LIFTER ASSEMBLY LH


    1. B006FFXC04
      *1 Pop Up Hood Lifter Assembly LH
      *2 Pedestrian Detection ECU Assembly
      *3 SST
      *a

      Front view of wire harness connector

      (to Pop Up Hood Lifter Assembly LH)

      Connect the connectors from the instrument panel wire and pedestrian detection ECU assembly.

    2. Connect the white wire side of SST (resistance: 2.1 Ω) to connector E.

      CAUTION:

      Never connect the tester to the horn button assembly for measurement, as this may lead to a serious injury due to pop up hood lifter deployment.

      Note


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

      • Insert SST straight into the terminals of the connector.

      SST
      09843-18061

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

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

    5. Clear the DTCs.

      Click here


      Body Electrical > Pedestrian Protection > Clear DTCs

    6. Turn the engine switch off.

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

    8. Check for DTCs.

      Click here


      Body Electrical > Pedestrian Protection > Trouble Codes
      Result
      Result Proceed to
      DTC B1995, B1996, B1997 or B1998 is not output A
      DTC B1995, B1996, B1997 or B1998 is output B

      Tech Tips

      Codes other than DTC B1995, B1996, B1997 and B1998 may be output at this time, but they are not related to this check.

    9. Turn the engine switch off.

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

    11. Disconnect SST from connector E.


    A

    REPLACE POP UP HOOD LIFTER ASSEMBLY LH Click here

    B

  3. CHECK POP UP HOOD LIFTER ASSEMBLY LH CIRCUIT


    1. B006CQXC07
      *1 Pop Up Hood Lifter Assembly LH
      *2 Pedestrian Detection ECU Assembly
      *3 Engine Room Main Wire
      *4 Instrument Panel Wire
      *a

      Front view of wire harness connector

      (to Pop Up Hood Lifter Assembly LH)
      B006AHR Release the Activation Prevention Mechanism

      Disconnect the instrument panel wire from the pedestrian detection ECU assembly.

    2. Check for a short to B+ in the circuit.


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

      2. Turn the engine switch on (IG).

      3. Measure the voltage according to the value(s) in the table below.

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        A52-2 (PTL+) - Body ground Engine switch on (IG) Below 1 V
        A52-1 (PTL-) - Body ground Engine switch on (IG) Below 1 V

      4. Turn the engine switch off.

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

    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
        A52-2 (PTL+) - A52-1 (PTL-) 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
        A52-2 (PTL+) - Body ground Always 1 MΩ or higher
        A52-1 (PTL-) - 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
        A52-2 (PTL+) - A52-1 (PTL-) Always 1 MΩ or higher

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

      Result
      Proceed to
      OK
      NG

    NG

    CHECK INSTRUMENT PANEL WIRE Click here

    OK

  4. CHECK DTC


    1. B006EUSC01
      *1 Pop Up Hood Lifter Assembly LH
      *2 Pedestrian Detection ECU Assembly

      Connect the connectors to the pop up hood lifter assembly LH and pedestrian detection ECU assembly.

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

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

    4. Clear the DTCs.

      Click here


      Body Electrical > Pedestrian Protection > Clear DTCs

    5. Turn the engine switch off.

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

    7. Check for DTCs.

      Click here


      Body Electrical > Pedestrian Protection > Trouble Codes
      Result
      Result Proceed to
      DTC B1995, B1996, B1997 or B1998 is not output A
      DTC B1995, B1996, B1997 or B1998 is output B

      Tech Tips

      Codes other than DTC B1995, B1996, B1997 and B1998 may be output at this time, but they are not related to this check.


    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE PEDESTRIAN DETECTION ECU ASSEMBLY Click here

  5. CHECK INSTRUMENT PANEL WIRE


    1. B006ERTC04
      *1 Pop Up Hood Lifter Assembly LH
      *2 Pedestrian Detection ECU Assembly
      *3 Engine Room Main Wire
      *4 Instrument Panel Wire
      *a

      Front view of wire harness connector

      (to Engine Room Main Wire)
      B006AHR Release the Activation Prevention Mechanism

      Disconnect the engine room main wire from the instrument panel wire.

    2. Check for a short to B+ in the circuit.


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

      2. Turn the engine switch on (IG).

      3. Measure the voltage according to the value(s) in the table below.

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        GA 2-5 (PTL+) - Body ground Engine switch on (IG) Below 1 V
        GA 2-6 (PTL-) - Body ground Engine switch on (IG) Below 1 V

      4. Turn the engine switch off.

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

    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
        GA 2-5 (PTL+) - GA 2-6 (PTL-) 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
        GA 2-5 (PTL+) - Body ground Always 1 MΩ or higher
        GA 2-6 (PTL-) - 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
        GA 2-5 (PTL+) - GA 2-6 (PTL-) Always 1 MΩ or higher

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

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ENGINE ROOM MAIN WIRE

    NG

    REPLACE INSTRUMENT PANEL WIRE