AIRBAG SYSTEM, Diagnostic DTC:B1805/52, B1806/52, B1807/52, B1808/52

DTC Code DTC Name
B1805/52 Short in Front Passenger Side Squib Circuit
B1806/52 Open in Front Passenger Side Squib Circuit
B1807/52 Short to GND in Front Passenger Side Squib Circuit
B1808/52 Short to B+ in Front Passenger Side Squib Circuit

DESCRIPTION

The front passenger side squib circuit consists of the center airbag sensor assembly and the front passenger airbag assembly.

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

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

DTC No. DTC Detection Condition Trouble Area
B1805/52

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

  • Front passenger side squib malfunction

  • Center airbag sensor assembly malfunction

  • Engine room main wire

  • Instrument panel wire

  • Instrument panel wire No.3

  • Front passenger airbag assembly (Front passenger side squib)

  • Center airbag sensor assembly
B1806/52

  • The center airbag sensor assembly receives an open circuit signal in the front passenger side squib circuit for 2 seconds.

  • Front passenger side squib malfunction

  • Center airbag sensor assembly malfunction

  • Engine room main wire

  • Instrument panel wire

  • Instrument panel wire No.3

  • Front passenger airbag assembly (Front passenger side squib)

  • Center airbag sensor assembly
B1807/52

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

  • Front passenger side squib malfunction

  • Center airbag sensor assembly malfunction

  • Engine room main wire

  • Instrument panel wire

  • Instrument panel wire No.3

  • Front passenger airbag assembly (Front passenger side squib)

  • Center airbag sensor assembly
B1808/52

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

  • Front passenger side squib malfunction

  • Center airbag sensor assembly malfunction

  • Engine room main wire

  • Instrument panel wire

  • Instrument panel wire No.3

  • Front passenger airbag assembly (Front passenger side squib)

  • Center airbag sensor assembly

WIRING DIAGRAM

A003BLHE01

INSPECTION PROCEDURE

Note

After replacing the airbag ECU assembly, refer to initialization Click here.

Tech Tips

To perform the simulation method, select the "check mode" (signal check) with the intelligent tester Click here, and then wiggle each connector of the airbag system or drive the vehicle on a city or rough road Click here.

PROCEDURE


  1. CHECK FRONT PASSENGER AIRBAG ASSEMBLY (FRONT PASSENGER SIDE SQUIB)


    1. A003F4PE01

      Turn the ignition switch to the LOCK position.

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

    3. Disconnect the connector from the front passenger airbag assembly.

    4. Connect the white wire side of SST (resistance 2.1 Ω) to connector "G".

      CAUTION:

      Never connect a tester to the front passenger 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 the SST into the terminals of the connector.

      • Insert the SST straight into the terminals of the connector.

      SST
      09843-18060

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

    6. Turn the ignition switch to the ON position, and wait for at least 60 seconds.

    7. Clear the DTCs stored in memory Click here.

    8. Turn the ignition switch to the LOCK position.

    9. Turn the ignition switch to the ON position, and wait for at least 60 seconds.

    10. Check the DTCs Click here.

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

      Tech Tips

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


    OK

    REPLACE FRONT PASSENGER AIRBAG ASSEMBLY

    NG

  2. CHECK CONNECTOR


    1. Turn the ignition switch to the LOCK position.

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

    3. Disconnect the SST from connector "G".

    4. Check that the instrument panel wire No.3 connector (on the front passenger airbag assembly side) is not damaged.

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

    NG

    REPAIR OR REPLACE INSTRUMENT PANEL WIRE NO.3

    OK

  3. CHECK FRONT PASSENGER SIDE SQUIB CIRCUIT


    1. A003HSUE01

      Disconnect the connectors from the center airbag sensor assembly.

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


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

      2. Turn the ignition switch to the ON position.

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

        Voltage
        Tester connection Switch Condition Specified condition
        J1-1 (P+) - Body ground Ignition switch ON Below 1 V
        J1-2 (P-) - Body ground Ignition switch ON Below 1 V

    3. Check for open in the circuit.


      1. Turn the ignition switch to the LOCK position.

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

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

        Resistance
        Tester connection Condition Specified condition
        J1-1 (P+) - J1-2 (P-) Always Below 1 Ω

    4. Check for short to ground in the circuit.


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

        Resistance
        Tester connection Condition Specified condition
        J1-1 (P+) - Body ground Always 1 MΩ or higher
        J1-2 (P-) - Body ground Always 1 MΩ or higher

    5. Check for 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.

        Resistance
        Tester connection Condition Specified condition
        J1-1 (P+) - J1-2 (P-) Always 1 MΩ or higher

    NG

    CHECK ENGINE ROOM MAIN WIRE Click here

    OK

  4. CHECK CENTER AIRBAG SENSOR ASSEMBLY


    1. A003G4WE01

      Connect the connectors to the front passenger airbag assembly and the center airbag sensor assembly.

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

    3. Turn the ignition switch to the ON position, and wait for at least 60 seconds.

    4. Clear the DTCs stored in memory Click here.

    5. Turn the ignition switch to the LOCK position.

    6. Turn the ignition switch to the ON position, and wait for at least 60 seconds.

    7. Check the DTCs Click here.

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

      Tech Tips

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


    NG

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY

    OK

    USE SIMULATION METHOD TO CHECK

  5. CHECK ENGINE ROOM MAIN WIRE


    1. A003ATXE01

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

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

    3. Check for short to B+ in the circuit.


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

      2. Turn the ignition switch to the ON position.

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

        Voltage
        Tester connection Switch Condition Specified condition

        HB3-2 (P+) -

        Body ground

        		 Ignition switch ON Below 1 V

        HB3-4 (P-) -

        Body ground

        		 Ignition switch ON Below 1 V

    4. Check for open in the circuit.


      1. Turn the ignition switch to the LOCK position.

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

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

        Resistance
        Tester connection Condition Specified condition
        HB3-2 (P+) - HB3-4 (P-) Always Below 1 Ω

    5. Check for short to ground in the circuit.


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

        Resistance
        Tester connection Condition Specified condition

        HB3-2 (P+) -

        Body ground

        		 Always 1 MΩ or higher

        HB3-4 (P-) -

        Body ground

        		 Always 1 MΩ or higher

    6. Check for short to ground 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.

        Resistance
        Tester connection Condition Specified condition
        HB3-2 (P+) - HB3-4 (P-) Always 1 MΩ or higher

    NG

    REPAIR OR REPLACE ENGINE ROOM MAIN WIRE

    OK

  6. CHECK INSTRUMENT PANEL WIRE


    1. A003HVWE01

      Disconnect the instrument panel wire connector from the instrument panel wire No.3.

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


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

      2. Turn the ignition switch to the ON position.

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

        Voltage
        Tester connection Switch Condition Specified condition

        HJ1-2 (P+) -

        Body ground

        		 Ignition switch ON Below 1 V

        HJ1-1 (P-) -

        Body ground

        		 Ignition switch ON Below 1 V

    3. Check for open in the circuit.


      1. Turn the ignition switch to the LOCK position.

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

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

        Resistance
        Tester connection Condition Specified condition
        HJ1-2 (P+) - HJ1-1 (P-) Always Below 1 Ω

    4. Check for short to ground in the circuit.


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

        Resistance
        Tester connection Condition Specified condition

        HJ1-2 (P+) -

        Body ground

        		 Always 1 MΩ or higher

        HJ1-1 (P-) -

        Body ground

        		 Always 1 MΩ or higher

    5. Check for 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.

        Resistance
        Tester connection Condition Specified condition
        HJ1-2 (P+) - HJ1-1 (P-) Always 1 MΩ or higher

    NG

    REPAIR OR REPLACE INSTRUMENT PANEL WIRE

    OK

  7. CHECK INSTRUMENT PANEL WIRE NO.3


    1. A003BG3E01

      Check for short to B+ in the circuit.


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

      2. Turn the ignition switch to the ON position.

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

        Voltage
        Tester connection Switch Condition Specified condition
        J1-1 (P+) - Body ground Ignition switch ON Below 1 V
        J1-2 (P-) - Body ground Ignition switch ON Below 1 V

    2. Check for open in the circuit.


      1. Turn the ignition switch to the LOCK position.

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

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

        Resistance
        Tester connection Condition Specified condition
        J1-1 (P+) - J1-2 (P-) Always Below 1 Ω

    3. Check for short to ground in the circuit.


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

        Resistance
        Tester connection Condition Specified condition
        J1-1 (P+) - Body ground Always 1 MΩ or higher
        J1-2 (P-) - Body ground Always 1 MΩ or higher

    4. Check for short in the circuit.


      1. Release the activation prevention mechanism built into connector "F" Click here.

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

        Resistance
        Tester connection Condition Specified condition
        J1-1 (P+) - J1-2 (P-) Always 1 MΩ or higher

    NG

    REPAIR OR REPLACE INSTRUMENT PANEL WIRE NO.3

    OK

    USE SIMULATION METHOD TO CHECK