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 sensor assembly and instrument panel passenger airbag.

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 Code DTC Detection Condition Trouble Area
B1805/52

One of the following conditions is met:


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

  • A front passenger side squib malfunction.

  • An airbag sensor assembly malfunction.


  • Instrument panel wire

  • No. 2 instrument panel wire

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

  • Airbag sensor assembly

B1806/52

One of the following conditions is met:


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

  • A front passenger side squib malfunction.

  • An airbag sensor assembly malfunction.

B1807/52

One of the following conditions is met:


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

  • A front passenger side squib malfunction.

  • An airbag sensor assembly malfunction.

B1808/52

One of the following conditions is met:


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

  • A front passenger side squib malfunction.

  • An airbag sensor assembly malfunction.

WIRING DIAGRAM

A004RXUE52
*a Dz2
*b Instrument Panel Passenger Airbag Assembly (Front Passenger Side Squib)
*c Airbag Sensor Assembly

CAUTION / NOTICE / HINT

Note


  • After turning the ignition 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 (See page ), and then wiggle each connector of the airbag system or drive the vehicle on various types of road Click here.

PROCEDURE


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


    1. A004QZ8E01
      Text in Illustration
      *1 Front Passenger Side Squib
      *2 Airbag Sensor Assembly
      *3 Connector E
      *4 SST
      *a

      Front view of wire harness connector

      (to Front Passenger Side Squib)

      *b Color: Orange

      Turn the ignition switch off.

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

    3. Disconnect the connectors from the instrument panel passenger airbag.

    4. 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 airbag (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 SST.

      • Insert SST straight into the terminals of the connector.

      SST
      09843-18061
    5. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

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

    7. Clear the DTCs Click here.

    8. Turn the ignition switch off.

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

    10. Check for DTCs Click here.

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

      Tech Tips

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

    11. Turn the ignition switch off.

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

    13. Disconnect SST from connector E.


    OK
    NG
  2. CHECK CONNECTORS


    1. Disconnect the connectors from the airbag sensor assembly.

    2. A004PPTE01
      Text in Illustration
      *1 Front Passenger Side Squib
      *2 Airbag Sensor Assembly

      Check that the connectors (on the airbag sensor assembly side and instrument panel passenger airbag side) are not damaged.

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

    NG
    OK
  3. CHECK FRONT PASSENGER SIDE SQUIB CIRCUIT


    1. A004NCKE01
      Text in Illustration
      *1 Front Passenger Side Squib
      *2 Airbag Sensor Assembly
      *3 Connector E
      *a

      Front view of wire harness connector

      (to Front Passenger Side Squib)

      *b Color: Orange

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

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      z7-2 (P+) - Body ground Ignition switch ON Below 1 V
      z7-1 (P-) - Body ground Ignition switch ON Below 1 V
    4. Turn the ignition switch off.

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      z7-2 (P+) - z7-1 (P-) Always Below 1 Ω
    7. Release the activation prevention mechanism built into connector B Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      z7-2 (P+) - z7-1 (P-) Always 1 MΩ or higher
      z7-2 (P+) - Body ground Always 1 MΩ or higher
      z7-1 (P-) - Body ground Always 1 MΩ or higher
    9. Restore the released activation prevention mechanism of connector B to its original condition.


    NG
    OK
  4. CHECK FOR DTC


    1. A004Q1TE05
      Text in Illustration
      *1 Front Passenger Side Squib
      *2 Airbag Sensor Assembly

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

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

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

    4. Clear the DTCs Click here.

    5. Turn the ignition switch off.

    6. Turn the ignition switch to ON, 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 DTC 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. A004PPHE02
      Text in Illustration
      *1 Front Passenger Side Squib
      *2 No. 2 Instrument Panel Wire
      *3 Instrument Panel Wire
      *4 Airbag Sensor Assembly
      *5 Connector C
      *a

      Front view of wire harness connector

      (to No. 2 Instrument Panel Wire)

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

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

    3. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      Dz2-1 (P+) - Body ground Ignition switch ON Below 1 V
      Dz2-2 (P-) - Body ground Ignition switch ON Below 1 V
    5. Turn the ignition switch off.

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Dz2-1 (P+) - Dz2-2 (P-) Always Below 1 Ω
    8. Release the activation prevention mechanism built into connector B Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Dz2-1 (P+) - Dz2-2 (P-) Always 1 MΩ or higher
      Dz2-1 (P+) - Body ground Always 1 MΩ or higher
      Dz2-2 (P-) - Body ground Always 1 MΩ or higher
    10. Restore the released activation prevention mechanism of connector B to its original condition.


    OK
    NG