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 airbag ECU assembly and instrument panel passenger airbag assembly.

The airbag ECU assembly uses this circuit to deploy the airbag when deployment conditions are met.

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

DTC No. DTC Detection Condition Trouble Area
B1805/52
  • The airbag ECU assembly receives a line short circuit signal in the front passenger side squib circuit during primary check.

  • Front passenger side squib malfunction

  • Airbag ECU assembly malfunction


  • Instrument panel wire

  • No. 3 instrument panel wire

  • Instrument panel passenger airbag assembly (Front passenger side squib)

  • Airbag ECU assembly

B1806/52
  • The airbag ECU assembly receives an open circuit signal in the front passenger side squib circuit.

  • Front passenger side squib malfunction

  • Airbag ECU assembly malfunction

B1807/52
  • The airbag ECU assembly receives a short circuit to ground signal in the front passenger side squib circuit.

  • Front passenger side squib malfunction

  • Airbag ECU assembly malfunction

B1808/52
  • The airbag ECU assembly receives a short circuit to B+ signal in the front passenger side squib circuit.

  • Front passenger side squib malfunction

  • Airbag ECU assembly malfunction

WIRING DIAGRAM

B005XMKE16
*a Instrument Panel Passenger Airbag Assembly (Front Passenger Side Squib)
*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.

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. B005XCUE07
      Text in Illustration
      *1 Instrument Panel Passenger Airbag Assembly
      *2 Airbag ECU Assembly
      *3 No. 3 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 airbag assembly and airbag ECU assembly. Also check that the connectors that link the instrument panel wire and No. 3 instrument panel wire are properly connected.

      OK
      The connectors are properly connected.

      Tech Tips

      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 airbag assembly and airbag ECU assembly. Also disconnect the instrument panel wire from the No. 3 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. 3 instrument panel wire connector (on the instrument panel 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.
    7. Check that the short springs for the instrument panel wire and No. 3 instrument panel wire with the activation prevention mechanism are not deformed or damaged.

      OK
      The short springs are not deformed or damaged.

    NG
    OK
  2. CHECK INSTRUMENT PANEL PASSENGER AIRBAG ASSEMBLY (FRONT PASSENGER SIDE SQUIB)


    1. B005Z81E02
      Text in Illustration
      *1 Instrument Panel Passenger Airbag Assembly
      *2 Airbag ECU Assembly
      *a

      Front view of wire harness connector

      (to Instrument Panel Passenger Airbag Assembly)

      Connect the instrument panel wire to the No. 3 instrument panel wire and airbag ECU assembly.

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

      CAUTION:

      Never connect the tester to the instrument panel 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 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.

    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.

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

      Tech Tips

      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.

    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.


    OK
    NG
  3. CHECK FRONT PASSENGER SIDE SQUIB CIRCUIT


    1. B005ZB8E02
      Text in Illustration
      *1 Instrument Panel Passenger Airbag Assembly
      *2 Airbag ECU Assembly
      *a

      Front view of wire harness connector

      (to Instrument Panel Passenger Airbag Assembly)

      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.

      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
        H3-1 (P+) - Body ground Power switch on (IG) Below 1 V
        H3-2 (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.

        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
        H3-1 (P+) - H3-2 (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
        H3-1 (P+) - Body ground Always 1 MΩ or higher
        H3-2 (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
        H3-1 (P+) - H3-2 (P-) Always 1 MΩ or higher
      3. Restore the released activation prevention mechanism of connector B to the original condition.


    NG
    OK
  4. CHECK DTC


    1. B005ZQ1E07
      Text in Illustration
      *1 Instrument Panel Passenger Airbag Assembly
      *2 Airbag ECU Assembly

      Connect the connectors to the instrument panel passenger airbag assembly and airbag ECU assembly.

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

    3. Clear the DTCs stored in memory Click here.

    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.

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

      Tech Tips

      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.


    OK
    NG
  5. CHECK INSTRUMENT PANEL WIRE


    1. B005YOUE01
      Text in Illustration
      *1 Instrument Panel Passenger Airbag Assembly
      *2 Airbag ECU Assembly
      *3 No. 3 Instrument Panel Wire
      *4 Instrument Panel Wire
      *a

      Front view of wire harness connector

      (to No. 3 Instrument Panel Wire)

      Disconnect the No. 3 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.

      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
        LH2-1 (P+) - Body ground Power switch on (IG) Below 1 V
        LH2-2 (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.

        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
        LH2-1 (P+) - LH2-2 (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
        LH2-1 (P+) - Body ground Always 1 MΩ or higher
        LH2-2 (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
        LH2-1 (P+) - LH2-2 (P-) Always 1 MΩ or higher
      3. Restore the released activation prevention mechanism of connector B to the original condition.


    NG
    OK
  6. CHECK NO. 3 INSTRUMENT PANEL WIRE


    1. B005Y5AE02
      Text in Illustration
      *1 Instrument Panel Passenger Airbag Assembly
      *2 Airbag ECU Assembly
      *3 No. 3 Instrument Panel Wire
      *4 Instrument Panel Wire
      *a

      Front view of wire harness connector

      (to Instrument Panel Passenger Airbag Assembly)

      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
        H3-1 (P+) - Body ground Power switch on (IG) Below 1 V
        H3-2 (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.

        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
        H3-1 (P+) - H3-2 (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
        H3-1 (P+) - Body ground Always 1 MΩ or higher
        H3-2 (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 Click here.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        H3-1 (P+) - H3-2 (P-) Always 1 MΩ or higher
      3. Restore the released activation prevention mechanism of connector D to the original condition.


    OK
    NG