AIRBAG SYSTEM, Diagnostic DTC:B1813/53

DTC Code DTC Name
B1813/53 Short to B+ in Driver Side Squib 2nd Step Circuit

DESCRIPTION

The driver side squib 2nd step circuit consists of the airbag sensor assembly, spiral cable with sensor sub-assembly and horn button assembly.

The airbag sensor assembly uses this circuit to deploy the airbag when deployment conditions are met.

DTC B1813/53 is stored when a short to B+ is detected in the driver side squib 2nd step circuit.

DTC No. Detection Item DTC Detection Condition Trouble Area Test Mode / Check Mode
B1813/53 Short to B+ in Driver Side Squib 2nd Step Circuit

  • The airbag sensor assembly detects a short to B+ in the driver side squib 2nd step circuit.

  • Spiral cable with sensor sub-assembly malfunction

  • Driver side squib 2nd step malfunction

  • Airbag sensor assembly malfunction

  • Instrument panel wire

  • Spiral cable with sensor sub-assembly

  • Driver side squib 2nd step (Horn button assembly)

  • Airbag sensor assembly

 Applies to check mode

WIRING DIAGRAM

A01MI3DE83
*a Driver Side Squib 2nd Step (Horn Button Assembly)
*b Spiral Cable with Sensor Sub-assembly
*c Airbag Sensor Assembly

CAUTION / NOTICE / HINT

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

Tech Tips


  • Perform the simulation method by selecting check mode (Signal Check) using the GTS.

    Click here

  • After selecting check mode (Signal Check), perform the simulation method by wiggling each connector of the airbag system or driving the vehicle on a city road or rough road.

    Click here

PROCEDURE


  1. CHECK CONNECTORS


    1. A01MFVQC01
      *1 Horn Button Assembly
      *2 Spiral Cable with Sensor Sub-assembly
      *3 Airbag Sensor Assembly
      *4 Instrument Panel Wire

      Turn the power switch off.

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

    3. Check that the connectors are properly connected to the horn button assembly, spiral cable with sensor sub-assembly and airbag sensor assembly.

      OK
      The connectors are properly connected.

      Tech Tips

      If the connectors are not properly connected, reconnect the connectors and proceed to the next inspection.

    4. Disconnect the connectors from the horn button assembly, spiral cable with sensor sub-assembly and airbag sensor assembly.

    5. Check that the terminals of the connectors are not damaged.

      OK
      The terminals are not deformed or damaged.

    6. Check that the spiral cable with sensor sub-assembly connector (on the horn button assembly side) is not damaged.

      OK
      The connector locking button is not disengaged, or the claw of the lock is not deformed or damaged.

    7. Check that the short springs for the instrument panel wire and spiral cable with sensor sub-assembly with the activation prevention mechanism are not deformed or damaged.

      OK
      The short springs are not deformed or damaged.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE WIRE HARNESS

    OK

  2. CHECK DRIVER SIDE SQUIB 2ND STEP CIRCUIT


    1. A01MGJPC11
      *1 Horn Button Assembly
      *2 Spiral Cable with Sensor Sub-assembly
      *3 Airbag Sensor Assembly
      *a

      Front view of wire harness connector

      (to Horn Button Assembly)
      *b Color: Orange

      Connect the instrument panel wire to the spiral cable with sensor sub-assembly.

    2. Check for a short to B+ in the circuit.


      1. Connect the cable to the negative (-) auxiliary battery terminal.

      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
        z6-2 (D2+) - Body ground Power switch on (IG) Below 1 V
        z6-1 (D2-) - Body ground Power switch on (IG) Below 1 V
      Result
      Proceed to
      OK
      NG

    NG

    CHECK INSTRUMENT PANEL WIRE Click here

    OK

  3. CHECK DTC


    1. A01MFWIC05
      *1 Horn Button Assembly
      *2 Spiral Cable with Sensor Sub-assembly
      *3 Airbag Sensor Assembly
      *a

      Front view of wire harness connector

      (to Horn Button Assembly)
      *b Service Wire
      *c Color: Orange

      Turn the power switch off.

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

    3. Connect the connectors to the airbag sensor assembly.

    4. Using a service wire, connect terminals 2 (D2+) and 1 (D2-) of connector E.

      Note

      Do not forcibly insert the service wire into the terminals of the connector when connecting the wire.

    5. Connect the cable to the negative (-) auxiliary battery terminal.

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

    7. Clear the DTCs stored in memory.

      Click here


      Body Electrical > SRS Airbag > Clear DTCs

    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


      Body Electrical > SRS Airbag > Trouble Codes
      OK
      DTC B1813/53 is not output.

      Tech Tips

      Codes other than DTC B1813/53 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 the service wire from connector E.

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE AIRBAG SENSOR ASSEMBLY Click here

    OK

  4. CHECK DTC


    1. A01MJGBC01
      *1 Horn Button Assembly
      *2 Spiral Cable with Sensor Sub-assembly
      *3 Airbag Sensor Assembly

      Connect the connectors to the horn button assembly.

    2. Connect the cable to the negative (-) auxiliary battery terminal.

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

    4. Clear the DTCs stored in memory.

      Click here


      Body Electrical > SRS Airbag > Clear DTCs

    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


      Body Electrical > SRS Airbag > Trouble Codes
      OK
      DTC B1813/53 is not output.

      Tech Tips

      Codes other than DTC B1813/53 may be output at this time, but they are not related to this check.

      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE HORN BUTTON ASSEMBLY Click here

  5. CHECK INSTRUMENT PANEL WIRE


    1. Turn the power switch off.

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

    3. A01MH5SC02
      *1 Horn Button Assembly
      *2 Spiral Cable with Sensor Sub-assembly
      *3 Airbag Sensor Assembly
      *4 Instrument Panel Wire
      *a

      Front view of wire harness connector

      (to Spiral Cable with Sensor Sub-assembly)

      Disconnect the instrument panel wire from the spiral cable with sensor sub-assembly.

    4. Check for a short to B+ in the circuit.


      1. Connect the cable to the negative (-) battery terminal.

      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
        G50-4 (D2+) - Body ground Power switch on (IG) Below 1 V
        G50-3 (D2-) - Body ground Power switch on (IG) Below 1 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  6. CHECK SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY


    1. A01MG2PC11
      *1 Horn Button Assembly
      *2 Spiral Cable with Sensor Sub-assembly
      *3 Airbag Sensor Assembly
      *4 Instrument Panel Wire
      *a

      Front view of wire harness connector

      (to Horn Button Assembly)
      *b Color: Orange

      Check for a short to B+ in the circuit.


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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        z6-2 (D2+) - Body ground Power switch on (IG) Below 1 V
        z6-1 (D2-) - Body ground Power switch on (IG) Below 1 V
      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY Click here