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 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 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

  • No. 2 instrument panel wire

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

  • Center airbag sensor assembly
B1806/52

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

  • No. 2 instrument panel wire

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

  • Center airbag sensor assembly
B1807/52

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

  • No. 2 instrument panel wire

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

  • Center airbag sensor assembly
B1808/52

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

  • No. 2 instrument panel wire

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

  • Center airbag sensor assembly

WIRING DIAGRAM

A003EDHE54

INSPECTION PROCEDURE

Note


  • 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.

  • w/ Navigation System (for HDD):

    After the ignition switch is turned off, the HDD navigation system requires approximately a minute to record various types of memory and settings. As a result, after turning the ignition switch off, wait a minute or more before disconnecting the cable from the negative (-) battery terminal.

Tech Tips

To perform the simulation method, enter 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 types of roads Click here.

PROCEDURE


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

    A003B2RE01
    Text in Illustration
    *1 Front Passenger Side Squib
    *2 Center Airbag Sensor
    *3

    Front view of wire harness connector

    (to Front Passenger Side Squib)
    *4 Connector E

    1. 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.

      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, 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 INSTRUMENT PANEL 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 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

    REPLACE NO. 2 INSTRUMENT PANEL WIRE

    OK

  3. CHECK FRONT PASSENGER SIDE SQUIB CIRCUIT

    A003CKIE01
    Text in Illustration
    *1 Front Passenger Side Squib
    *2 Center Airbag Sensor
    *3

    Front view of wire harness connector

    (to Front Passenger Side Squib)
    *4 Connector E

    1. Disconnect the connectors from the center airbag sensor.

    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
      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

    NG

    CHECK INSTRUMENT PANEL WIRE (CENTER AIRBAG SENSOR - NO. 2 INSTRUMENT PANEL WIRE) Click here

    OK

  4. CHECK CENTER AIRBAG SENSOR

    A003DY5E01
    Text in Illustration
    *1 Front Passenger Side Squib
    *2 Center Airbag Sensor

    1. Connect the connectors to the instrument panel 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 - NO. 2 INSTRUMENT PANEL WIRE)

    A003B5DE01
    Text in Illustration
    *1 Front Passenger Side Squib
    *2 No. 2 Instrument Panel Wire
    *3 Instrument Panel Wire
    *4 Center Airbag Sensor
    *5

    Front view of wire harness connector

    (to No. 2 Instrument Panel Wire)
    *6 Connector C

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

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

    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
      Dz2-1 - Body ground Ignition switch ON Below 1 V
      Dz2-2 - 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 - Dz2-2 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 - Dz2-2 Always 1 MΩ or higher
      Dz2-1 - Body ground Always 1 MΩ or higher
      Dz2-2 - Body ground Always 1 MΩ or higher

    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

    REPLACE NO. 2 INSTRUMENT PANEL WIRE