AIRBAG SYSTEM, Diagnostic DTC:B1815/54, B1816/54, B1817/54, 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 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 2nd step circuit.

DTC Code DTC Detection Condition Trouble Area
B1815/54

One of the following conditions is met:


  • The center airbag sensor assembly 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 assembly malfunction.

  • Instrument panel wire

  • No. 2 instrument panel wire

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

  • Center airbag sensor assembly
B1816/54

One of the following conditions is met:


  • The center airbag sensor assembly 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 assembly malfunction.
B1817/54

One of the following conditions is met:


  • The center airbag sensor assembly 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 assembly malfunction.
B1818/54

One of the following conditions is met:


  • The center airbag sensor assembly 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 assembly malfunction.

WIRING DIAGRAM

A01FRGKE06

INSPECTION PROCEDURE

Note


  • After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work Click here.

  • When disconnecting the cable from the negative (-) auxiliary 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 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 ASSEMBLY (FRONT PASSENGER SIDE SQUIB 2ND STEP)


    1. A01FVHPE04
      Text in Illustration
      *1 Front Passenger Side Squib 2nd Step
      *2 Center Airbag Sensor Assembly
      *3 Connector E
      *4 SST
      *a

      Front view of wire harness connector

      (to Front Passenger Side Squib 2nd Step)
      *b Color: Black

      Turn the power switch off.

    2. Disconnect the cable from the negative (-) auxiliary 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 (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.

      SST
      09843-18061

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

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

    7. Clear the DTCs Click here.

    8. Turn the power switch off.

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

    10. Check for DTCs Click here.

      OK
      DTC B1815/54, B1816/54, B1817/54 or B1818/54 is not output.

      Tech Tips

      Codes other than DTC B1815/54, B1816/54, B1817/54 and B1818/54 may be output at this time, but they are not related to this check.

    11. Turn the power switch off.

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

    13. Disconnect SST from connector E.


    NG

    CHECK CONNECTOR Click here

    OK

    REPLACE INSTRUMENT PANEL PASSENGER AIRBAG ASSEMBLY Click here

  2. CHECK CONNECTOR


    1. Disconnect the connectors from the center airbag sensor assembly.

    2. A01FQ4ME01
      Text in Illustration
      *1 Front Passenger Side Squib 2nd Step
      *2 Center Airbag Sensor Assembly

      Check that the connectors (on the center 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 damaged or deformed.

    NG

    REPLACE HARNESS AND CONNECTOR

    OK

  3. CHECK FRONT PASSENGER SIDE SQUIB 2ND STEP CIRCUIT


    1. A01FS3JE04
      Text in Illustration
      *1 Front Passenger Side Squib 2nd Step
      *2 Center Airbag Sensor Assembly
      *3 Connector E
      *a

      Front view of wire harness connector

      (to Front Passenger Side Squib 2nd Step)
      *b Color: Black

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

    2. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      s2-2 (P2+) - Body ground Power switch on (IG) Below 1 V
      s2-1 (P2-) - Body ground Power switch on (IG) Below 1 V

    4. Turn the power switch off.

    5. Disconnect the cable from the negative (-) auxiliary 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
      s2-2 (P2+) - s2-1 (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
      s2-2 (P2+) - s2-1 (P2-) Always 1 MΩ or higher
      s2-2 (P2+) - Body ground Always 1 MΩ or higher
      s2-1 (P2-) - Body ground Always 1 MΩ or higher

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


    NG

    CHECK INSTRUMENT PANEL WIRE Click here

    OK

  4. CHECK CENTER AIRBAG SENSOR ASSEMBLY


    1. A01FVWRE04
      Text in Illustration
      *1 Front Passenger Side Squib 2nd Step
      *2 Center Airbag Sensor Assembly

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

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

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

    4. Clear the DTCs Click here.

    5. Turn the power switch off.

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

    7. Check for DTCs Click here.

      OK
      DTC B1815/54, B1816/54, B1817/54 or B1818/54 is not output.

      Tech Tips

      Codes other than DTC B1815/54, B1816/54, B1817/54 and B1818/54 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


    1. A01FRHSE04
      Text in Illustration
      *1 Front Passenger Side Squib 2nd Step
      *2 No. 2 Instrument Panel Wire
      *3 Instrument Panel Wire
      *4 Center 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 (-) auxiliary battery terminal, and wait for at least 2 seconds.

    3. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      Ns2-3 (P2+) - Body ground Power switch on (IG) Below 1 V
      Ns2-4 (P2-) - Body ground Power switch on (IG) Below 1 V

    5. Turn the power switch off.

    6. Disconnect the cable from the negative (-) auxiliary 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
      Ns2-3 (P2+) - Ns2-4 (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
      Ns2-3 (P2+) - Ns2-4 (P2-) Always 1 MΩ or higher
      Ns2-3 (P2+) - Body ground Always 1 MΩ or higher
      Ns2-4 (P2-) - Body ground Always 1 MΩ or higher

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


    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

    REPLACE NO. 2 INSTRUMENT PANEL WIRE