AIRBAG SYSTEM, Diagnostic DTC:B1815/54,B1816/54,B1817/54 and B1818/54

DTC Code DTC Name
B1815/54 Short in Front Passenger Side Squib 2nd Step Circuit
B1816/54 Open in Front Passenger Side Squib 2nd Step Circuit
B1817/54 Short to GND in Front Passenger Side Squib 2nd Step Circuit
B1818/54 Short to B+ in Front Passenger Side Squib 2nd Step Circuit

DESCRIPTION

The front passenger side squib 2nd step circuit consists of the center airbag sensor 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 2nd step circuit.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Test Mode / Check Mode

B1815/54

Short in Front Passenger Side Squib 2nd Step Circuit

One of the following conditions is met:

  • The center airbag sensor detects a line short circuit signal 5 times in the front passenger side squib 2nd step circuit during the primary check.

  • A front passenger side squib 2nd step malfunction.

  • A center airbag sensor malfunction.

  • Instrument panel wire

  • No. 2 instrument panel wire

  • Instrument panel passenger airbag assembly (Front passenger side squib 2nd step)

  • Center airbag sensor assembly

*2

B1816/54

Open in Front Passenger Side Squib 2nd Step Circuit

One of the following conditions is met:

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

  • A front passenger side squib 2nd step malfunction.

  • A center airbag sensor malfunction.

  • Instrument panel wire

  • No. 2 instrument panel wire

  • Instrument panel passenger airbag assembly (Front passenger side squib 2nd step)

  • Center airbag sensor assembly

*2

B1817/54

Short to GND in Front Passenger Side Squib 2nd Step Circuit

One of the following conditions is met:

  • The center airbag sensor detects a short circuit to ground signal in the front passenger side squib 2nd step circuit for 0.5 seconds.

  • A front passenger side squib 2nd step malfunction.

  • A center airbag sensor malfunction.

  • Instrument panel wire

  • No. 2 instrument panel wire

  • Instrument panel passenger airbag assembly (Front passenger side squib 2nd step)

  • Center airbag sensor assembly

*2

B1818/54

Short to B+ in Front Passenger Side Squib 2nd Step Circuit

One of the following conditions is met:

  • The center airbag sensor detects a short circuit to B+ signal in the front passenger side squib 2nd step circuit for 0.5 seconds.

  • A front passenger side squib 2nd step malfunction.

  • A center airbag sensor malfunction.

  • Instrument panel wire

  • No. 2 instrument panel wire

  • Instrument panel passenger airbag assembly (Front passenger side squib 2nd step)

  • Center airbag sensor assembly

*2

WIRING DIAGRAM

C253311E07

CAUTION / NOTICE / HINT

Note:

  • After turning the engine 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 road (Click here).

PROCEDURE

  1. CHECK INSTRUMENT PANEL PASSENGER AIRBAG (FRONT PASSENGER SIDE SQUIB 2ND STEP)

    1. C218289C04

      *1

      Front Passenger Side Squib 2nd Step

      *2

      Center Airbag Sensor

      *3

      Connector E

      *4

      SST

      *a

      Front view of wire harness connector

      (to Front Passenger Side Squib 2nd Step)

      *b

      Color: Black

      Turn the engine switch off.

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

    3. Disconnect the connectors from the steering pad.

    4. Connect the white wire side of SST (resistance: 2.1 Ω) to connector E (black connector).

      CAUTION:

      Never connect the tester to the instrument panel passenger airbag (front passenger side squib 2nd step) 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 engine switch on (IG), and wait for at least 60 seconds.

    7. Clear the DTCs.

      Click here

      Body Electrical > SRS Airbag > Clear DTCs

    8. Turn the engine switch off.

    9. Turn the engine switch on (IG), and wait for at least 60 seconds.

    10. Check for DTCs.

      Click here

      Body Electrical > SRS Airbag > Trouble Codes

      OK

      DTC B1815, B1816, B1817 or B1818 is not output.

      Tip:

      Codes other than DTC B1815, B1816, B1817 and B1818 may be output at this time, but they are not related to this check.

      Result

      Result

      OK

      NG

    09843-18061

    OK

    REPLACE INSTRUMENT PANEL PASSENGER AIRBAG ASSEMBLY

    Click here

    NG

  2. CHECK CONNECTOR

    1. C214773C03

      *1

      Front Passenger Side Squib 2nd Step

      *2

      Center Airbag Sensor

      Turn the engine 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 spiral cable connectors (on the steering pad side) are not damaged.

      OK

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

      Result

      Result

      OK

      NG
    NG

    REPLACE NO. 2 INSTRUMENT PANEL WIRE

    OK

  3. CHECK FRONT PASSENGER SIDE SQUIB 2ND STEP CIRCUIT

    1. C218290C04

      *1

      Front Passenger Side Squib 2nd Step

      *2

      Center Airbag Sensor

      *3

      Connector E

      *a

      Front view of wire harness connector

      (to Front Passenger Side Squib 2nd Step)

      *b

      Color: Black

      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

      F2-2 (P2+) - Body ground

      Engine switch on (IG)

      Below 1 V

      F2-1 (P2-) - Body ground

      Engine switch on (IG)

      Below 1 V

    4. Turn the engine 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

      F2-2 (P2+) - F2-1 (P2-)

      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

      F2-2 (P2+) - F2-1 (P2-)

      Always

      1 MΩ or higher

      F2-2 (P2+) - Body ground

      Always

      1 MΩ or higher

      F2-1 (P2-) - Body ground

      Always

      1 MΩ or higher

      Result

      Result

      OK

      NG
    NG

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

    OK

  4. CHECK CENTER AIRBAG SENSOR

    1. C146246C04

      *1

      Front Passenger Side Squib 2nd Step

      *2

      Center Airbag Sensor

      Connect the connectors to the steering pad and center airbag sensor.

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

    3. Turn the engine switch on (IG), and wait for at least 60 seconds.

    4. Clear the DTCs.

      Click here

      Body Electrical > SRS Airbag > Clear DTCs

    5. Turn the engine switch off.

    6. Turn the engine switch on (IG), and wait for at least 60 seconds.

    7. Clear the DTCs.

      Click here

      Body Electrical > SRS Airbag > Trouble Codes

      OK

      DTC B1815, B1816, B1817 or B1818 is not output.

      Tip:

      Codes other than DTC B1815, B1816, B1817 and B1818 may be output at this time, but they are not related to this check.

      Result

      Result

      OK

      NG
    OK

    USE SIMULATION METHOD TO CHECK

    Click here

    NG

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY

    Click here

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

    1. C213944C03

      *1

      Front Passenger Side Squib 2nd Step

      *2

      No. 2 Instrument Panel Wire

      *3

      Instrument Panel Wire

      *4

      Center Airbag Sensor

      *5

      Connector C

      *a

      Front view of wire harness connector

      (to No. 2 Instrument Panel Wire)

      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

      GF1-3 (P2+) - Body ground

      Engine switch on (IG)

      Below 1 V

      GF1-4 (P2-) - Body ground

      Engine switch on (IG)

      Below 1 V

    5. Turn the engine 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

      GF1-3 (P2+) - GF1-4 (P2-)

      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

      GF1-3 (P2+) - GF1-4 (P2-)

      Always

      1 MΩ or higher

      GF1-3 (P2+) - Body ground

      Always

      1 MΩ or higher

      GF1-4 (P2-) - Body ground

      Always

      1 MΩ or higher

      Result

      Result

      OK

      NG
    OK

    REPLACE NO. 2 INSTRUMENT PANEL WIRE

    NG

    REPLACE INSTRUMENT PANEL WIRE