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 and the front 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

When one of the following conditions is met:


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

  • A front passenger side squib malfunction.

  • A center airbag sensor malfunction.

  • Instrument panel wire

  • Instrument panel wire assembly

  • Front passenger airbag assembly (Front passenger side squib)

  • Center airbag sensor assembly
B1806/52

When one of the following conditions is met:


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

  • A front passenger side squib malfunction.

  • A center airbag sensor malfunction.

  • Instrument panel wire

  • Instrument panel wire assembly

  • Front passenger airbag assembly (Front passenger side squib)

  • Center airbag sensor assembly
B1807/52

When one of the following conditions is met:


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

  • A front passenger side squib malfunction.

  • A center airbag sensor malfunction.

  • Instrument panel wire

  • Instrument panel wire assembly

  • Front passenger airbag assembly (Front passenger side squib)

  • Center airbag sensor assembly
B1808/52

When one of the following conditions is met:


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

  • A front passenger side squib malfunction.

  • A center airbag sensor malfunction.

  • Instrument panel wire

  • Instrument panel wire assembly

  • Front passenger airbag assembly (Front passenger side squib)

  • Center airbag sensor assembly

WIRING DIAGRAM

A0156STE98

INSPECTION PROCEDURE

Note


  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work Click here.

  • When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.

Tech Tips

To perform the simulation method, enter 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 various type of road Click here.

PROCEDURE


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


    1. Turn the ignition switch off.

      A015D7EE05

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

    3. Disconnect the connectors from the front 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 front 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, B1806, B1807 or B1808 is not 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.


    NG

    CHECK CONNECTOR Click here

    OK

    REPLACE FRONT PASSENGER AIRBAG ASSEMBLY Click here

  2. CHECK CONNECTOR


    1. Turn the ignition switch off.

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

    3. Disconnect SST from connector E.

    4. Check that the instrument panel wire connectors (on the front 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

    REPLACE INSTRUMENT PANEL WIRE ASSEMBLY

    OK

  3. CHECK FRONT PASSENGER SIDE SQUIB CIRCUIT


    1. Disconnect the connectors from the center airbag sensor.

      A015BR7E06

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

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      b3-1 (P+) - Body ground Ignition switch to ON Below 1 V
      b3-2 (P-) - Body ground Ignition switch to 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
      b3-1 (P+) - b3-2 (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
      b3-1 (P+) - b3-2 (P-) Always 1 MΩ or higher
      b3-1 (P+) - Body ground Always 1 MΩ or higher
      b3-2 (P-) - Body ground Always 1 MΩ or higher

    NG

    CHECK INSTRUMENT PANEL WIRE (CENTER AIRBAG SENSOR - INSTRUMENT PANEL WIRE ASSEMBLY) Click here

    OK

  4. CHECK CENTER AIRBAG SENSOR


    1. A0156E9E01

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

    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, B1806, B1807 or B1808 is not 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.


    NG

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  5. CHECK INSTRUMENT PANEL WIRE (CENTER AIRBAG SENSOR - INSTRUMENT PANEL WIRE ASSEMBLY)


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

      A0155DWE03

    2. Disconnect the instrument panel wire connector from the instrument panel wire assembly.

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

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      Eb1-3 - Body ground Ignition switch to ON Below 1 V
      Eb1-4 - Body ground Ignition switch to 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
      Eb1-3 - Eb1-4 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
      Eb1-3 - Eb1-4 Always 1 MΩ or higher
      Eb1-3 - Body ground Always 1 MΩ or higher
      Eb1-4 - Body ground Always 1 MΩ or higher

    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

    REPLACE INSTRUMENT PANEL WIRE ASSEMBLY