AIRBAG SYSTEM, Diagnostic DTC:B1805, B1806, B1807, B1808

DTC Code DTC Name
B1805 Short in Front Passenger Squib Circuit
B1806 Open in Front Passenger Squib Circuit
B1807 Short to GND in Front Passenger Side Squib Circuit
B1808 Short to B+ in Front Passenger Side Squib Circuit

DESCRIPTION

The front passenger side squib circuit consists of the airbag ECU assembly and instrument panel passenger without door airbag assembly.

The circuit instructs the SRS to deploy when deployment conditions are met.

These DTCs are stored when a malfunction is detected in the front passenger side squib circuit.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Test Mode / Check Mode
B1805 Short in Front Passenger Squib Circuit

One of the following conditions is met:


  • The airbag ECU assembly detects a line short circuit signal 5 times in the front passenger side squib circuit during the primary check.

  • A instrument panel passenger without door airbag assembly.

  • An airbag ECU assembly malfunction.

  • Instrument panel wire

  • No. 2 instrument panel wire

  • Instrument panel passenger without door airbag assembly

  • Airbag ECU assembly

 Comes on Applicable
B1806 Open in Front Passenger Squib Circuit

One of the following conditions is met:


  • The airbag ECU assembly detects an open circuit signal in the front passenger side squib circuit for 2 seconds.

  • A instrument panel passenger without door airbag assembly.

  • An airbag ECU assembly malfunction.

  • Instrument panel wire

  • No. 2 instrument panel wire

  • Instrument panel passenger without door airbag assembly

  • Airbag ECU assembly

 Comes on Applicable
B1807 Short to GND in Front Passenger Side Squib Circuit

One of the following conditions is met:


  • The airbag ECU assembly detects a short circuit to ground signal in the front passenger side squib circuit for 0.5 seconds.

  • A instrument panel passenger without door airbag assembly.

  • An airbag ECU assembly malfunction.

  • Instrument panel wire

  • No. 2 instrument panel wire

  • Instrument panel passenger without door airbag assembly

  • Airbag ECU assembly

 Comes on Applicable
B1808 Short to B+ in Front Passenger Side Squib Circuit

One of the following conditions is met:


  • The airbag ECU assembly detects a short circuit to B+ signal in the front passenger side squib circuit for 0.5 seconds.

  • A Instrument panel passenger without door airbag assembly.

  • An airbag ECU assembly malfunction.

  • Instrument panel wire

  • No. 2 instrument panel wire

  • Instrument panel passenger without door airbag assembly

  • Airbag ECU assembly

 Comes on Applicable

WIRING DIAGRAM

B004VGJE60
*a Instrument Panel Passenger Airbag Assembly
*b Airbag ECU Assembly

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

  • When disconnecting the cable from the negative (-) auxiliary 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 airbag system or drive the vehicle on various types of road Click here.

PROCEDURE


  1. CHECK CONNECTORS


    1. B004T1CC04
      *1 Instrument Panel Passenger without Door Airbag Assembly
      *2 Airbag ECU Assembly
      *3 No. 2 Instrument Panel Wire
      *4 Instrument Panel 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 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.

      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 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 deformed or 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 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 connector and No. 2 instrument panel wire connector are not deformed or damaged.

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

    NG

    REPLACE INSTRUMENT PANEL WIRE OR NO. 2 INSTRUMENT PANEL WIRE

    OK

  2. CHECK INSTRUMENT PANEL PASSENGER WITHOUT DOOR AIRBAG ASSEMBLY


    1. B004UINC25
      *1 Instrument Panel Passenger without Door Airbag Assembly
      *2 Airbag ECU Assembly
      *3 SST
      *a

      Front view of wire harness connector

      (to Instrument Panel Passenger without Door Airbag Assembly)
      *b Color: Orange

      Connect the instrument panel wire to the No. 2 instrument panel wire and airbag ECU assembly.

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

      CAUTION:

      Never connect the tester to the instrument panel passenger without door airbag assembly 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 SST.

      • Insert SST straight into the terminals of the connector.

      SST
      09843-18061

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

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

    5. Clear the DTCs.

      Click here


      Body Electrical > SRS Airbag > Clear DTCs

    6. Turn the power switch off.

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

    8. Check for DTCs.

      Click here


      Body Electrical > SRS Airbag > Trouble Codes
      Result
      Proceed to
      DTC B1805, B1806, B1807 and B1808 are not output
      DTC B1805, B1806, B1807 or B1808 is output

      Tech Tips

      Codes other than DTC B1805, B1806, B1807 and B1808 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, and wait for at least 90 seconds.

    11. Disconnect SST from connector E.


    DTC B1805, B1806, B1807 and B1808 are not output

    REPLACE INSTRUMENT PANEL PASSENGER WITHOUT DOOR AIRBAG ASSEMBLY Click here

    DTC B1805, B1806, B1807 or B1808 is output

  3. CHECK FRONT PASSENGER SIDE SQUIB CIRCUIT


    1. B004WFWC07
      *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)
      *b Color: Orange
      B004SZX Release the activation prevention mechanism

      Disconnect the instrument panel wire from the airbag ECU assembly.

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


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

      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
        G150-1 (P-) - Body ground Power switch on (IG) Below 1 V
        G150-2 (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, 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
        G150-1 (P-) - G150-2 (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
        G150-1 (P-) - Body ground Always 1 MΩ or higher
        G150-2 (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.

        Click here

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        G150-1 (P-) - G150-2 (P+) 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 INSTRUMENT PANEL WIRE Click here

    OK

  4. CHECK DTC


    1. B004R6FC15
      *1 Instrument Panel Passenger without Door Airbag Assembly
      *2 Airbag ECU Assembly

      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, and wait for at least 2 seconds.

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

    4. Clear the DTCs.

      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
      Result
      Proceed to
      DTC B1805, B1806, B1807 and B1808 are not output
      DTC B1805, B1806, B1807 or B1808 is output

      Tech Tips

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


    DTC B1805, B1806, B1807 and B1808 are not output

    USE SIMULATION METHOD TO CHECK Click here

    DTC B1805, B1806, B1807 or B1808 is output

    REPLACE AIRBAG ECU ASSEMBLY Click here

  5. CHECK INSTRUMENT PANEL WIRE


    1. B004WDYC02
      *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)
      B004SZX Release the activation prevention mechanism

      Disconnect the No. 2 instrument panel wire from the instrument panel wire.

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


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

      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
        GG 1-1 (P+) - Body ground Power switch on (IG) Below 1 V
        GG 1-2 (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, 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
        GG 1-1 (P+) - GG 1-2 (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
        GG 1-1 (P+) - Body ground Always 1 MΩ or higher
        GG 1-2 (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.

        Click here

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

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

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

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE NO. 2 INSTRUMENT PANEL WIRE

    NG

    REPLACE INSTRUMENT PANEL WIRE