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

  • Instrument panel wire Assembly

  • 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

  • Instrument panel wire Assembly

  • 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

  • Instrument panel wire Assembly

  • 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

  • Instrument panel wire Assembly

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

  • Center airbag sensor assembly

WIRING DIAGRAM

C363603E01

CAUTION / NOTICE / HINT

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 from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected (Click here).

Tip:

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)

    1. U123005E02

      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.

    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.

      Tip:

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

      Table 1. 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

    09843-18061

    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.

    REPLACE INSTRUMENT PANEL WIRE ASSEMBLY

  3. CHECK FRONT PASSENGER SIDE SQUIB CIRCUIT

    1. U123006E02

      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

      z5-2 (P+) - Body ground

      Ignition switch ON

      Below 1 V

      z5-1 (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

      z5-2 (P+) - z5-1 (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

      z5-2 (P+) - z5-1 (P-)

      Always

      1 MΩ or higher

      z5-2 (P+) - Body ground

      Always

      1 MΩ or higher

      z5-1 (P-) - Body ground

      Always

      1 MΩ or higher
    Table 2. 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

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

  4. CHECK CENTER AIRBAG SENSOR

    1. C202679E01

      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.

      Tip:

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

      Table 3. Text in Illustration

      *1

      Front Passenger Side Squib

      *2

      Center Airbag Sensor

    USE SIMULATION METHOD TO CHECK

    (Click here)

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY

    (Click here)

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

    1. U123007E02

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

    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

      Hz1-1 - Body ground

      Ignition switch ON

      Below 1 V

      Hz1-2 - 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

      Hz1-1 - Hz1-2

      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

      Hz1-1 - Hz1-2

      Always

      1 MΩ or higher

      Hz1-1 - Body ground

      Always

      1 MΩ or higher

      Hz1-2 - Body ground

      Always

      1 MΩ or higher
    Table 4. Text in Illustration

    *1

    Front Passenger Side Squib

    *2

    Instrument Panel Wire Assembly

    *3

    Instrument Panel Wire

    *4

    Center Airbag Sensor

    *5

    Front view of wire harness connector

    (to Instrument Panel Wire Assembly)

    *6

    Connector C

    REPLACE INSTRUMENT PANEL WIRE ASSEMBLY

    REPLACE INSTRUMENT PANEL WIRE