AIRBAG SYSTEM, Diagnostic DTC:B0103/12

DTC Code DTC Name
B0103/12 Short to B+ in Driver Side Squib Circuit

DESCRIPTION

The D squib circuit consists of the airbag ECU assembly, spiral cable sub-assembly and horn button assembly.

It causes the SRS to deploy when the SRS deployment conditions are satisfied.

DTC B0103/12 is recorded when a B+ short is detected in the D squib circuit.

DTC No. DTC Detecting Condition Trouble Area
B0103/12

  • Short circuit in D squib wire harness (to B+)

  • D squib malfunction

  • Spiral cable sub-assembly malfunction

  • Airbag ECU assembly malfunction

  • Horn button assembly (D squib)

  • Spiral cable sub-assembly

  • Airbag ECU assembly

  • Wire harness

WIRING DIAGRAM

Click here.

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK D SQUIB CIRCUIT (AIRBAG ECU ASSEMBLY-HORN BUTTON ASSEMBLY)


    1. A01KG55E01
      Text in Illustration
      *1 D Squib
      *2 Spiral Cable Sub-Assembly
      *3 Airbag ECU Assembly

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

    2. Disconnect the connector between the airbag ECU assembly and the horn button assembly.

    3. Connect negative (-) terminal cable to the battery, and turn the ignition switch to ON.

    4. For the connector (on the spiral cable sub-assembly side) between the spiral cable sub-assembly and the horn button assembly, measure the voltage between D+ and body ground.

      OK
      Voltage: Below 1 V

    NG

    CHECK COWL WIRE (AIRBAG ECU ASSEMBLY-SPIRAL CABLE SUB-ASSEMBLY) Click here

    OK

  2. CHECK AIR BAG ECU ASSEMBLY

    SST
    09843-18040

    1. A01KGS2E01
      Text in Illustration
      *1 D Squib
      *2 Spiral Cable Sub-Assembly
      *3 Airbag ECU Assembly
      *4 DLC3
      *a DTC B0103/12

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

    2. Connect the connector to the airbag ECU assembly.

    3. Using SST, connect D+ and D- of the connector (on the spiral cable sub-assembly side) between the spiral cable sub-assembly and the horn button assembly.

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

    5. Turn the ignition switch to ON, and wait at least for 20 seconds.

    6. Clear the DTC stored in memory Click here.

    7. Turn the ignition switch to LOCK, and wait at least for 20 seconds.

    8. Turn the ignition switch to ON, and wait at least for 60 seconds.

    9. Check the DTC Click here.

      OK
      DTC B0103/12 is not output.

      Tech Tips

      Codes other than code B0103/12 may be output at this time, but they are not relevant to this check.


    NG

    REPLACE AIR BAG ECU ASSEMBLY

    OK

  3. CHECK D SQUIB

    SST
    09843-18040

    1. A01KI7EE01
      Text in Illustration
      *1 D Squib
      *2 Spiral Cable Sub-Assembly
      *3 Airbag ECU Assembly
      *4 DLC3
      *a DTC B0103/12

      Turn the ignition switch to LOCK.

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

    3. Connect the horn button assembly connector.

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

    5. Turn the ignition switch to ON, and wait at least for 20 seconds.

    6. Clear the DTC stored in memory Click here.

    7. Turn the ignition switch to LOCK, and wait at least for 20 seconds.

    8. Turn the ignition switch to ON, and wait at least for 60 seconds.

    9. Check the DTC Click here.

      OK
      DTC B0103/12 is not output.

    NG

    REPLACE HORN BUTTON ASSEMBLY

    OK

  4. USE SIMULATION METHOD TO CHECK


    NG

    CHECK D SQUIB CIRCUIT (AIRBAG ECU ASSEMBLY-HORN BUTTON ASSEMBLY) Click here

    OK

    REPLACE ALL SRS COMPONENTS INCLUDING THE WIRE HARNESS

  5. CHECK COWL WIRE (AIRBAG ECU ASSEMBLY-SPIRAL CABLE SUB-ASSEMBLY)


    1. A01KFWZE01
      Text in Illustration
      *1 D Squib
      *2 Spiral Cable Sub-Assembly
      *3 Cowl Wire
      *4 Airbag ECU Assembly

      Turn the ignition switch to LOCK.

    2. Disconnect the connectors of the cowl wire.

    3. For the cowl wire connector (on the spiral cable sub-assembly side) between the spiral cable sub-assembly and airbag ECU assembly, measure the voltage between D+ and body ground.

      OK
      Voltage: Below 1 V

    NG

    REPAIR OR REPLACE COWL WIRE

    OK

  6. CHECK SPIRAL CABLE SUB-ASSEMBLY


    1. A01KG32E01
      Text in Illustration
      *1 D Squib
      *2 Spiral Cable Sub-Assembly
      *3 Airbag ECU Assembly

      For the connector (on the spiral cable sub-assembly side) between the spiral cable sub-assembly and the horn button assembly, measure the voltage between D+ and body ground.

      OK
      Voltage: Below 1 V

    NG

    REPLACE SPIRAL CABLE SUB-ASSEMBLY

    OK

  7. USE SIMULATION METHOD TO CHECK


    NG

    CHECK D SQUIB CIRCUIT (AIRBAG ECU ASSEMBLY-HORN BUTTON ASSEMBLY) Click here

    OK

    REPLACE ALL SRS COMPONENTS INCLUDING THE WIRE HARNESS