AIRBAG SYSTEM, Diagnostic DTC:B1860/64, B1861/64, B1862/64, B1863/64

DTC Code DTC Name
B1860/64 Short in Driver Side Knee Airbag Squib Circuit
B1861/64 Open in Driver Side Knee Airbag Squib Circuit
B1862/64 Short to GND in Driver Side Knee Airbag Squib Circuit
B1863/64 Short to B+ in Driver Side Knee Airbag Squib Circuit

DESCRIPTION

The driver side knee airbag squib circuit consists of the center airbag sensor assembly and the driver side knee airbag.

This circuit instructs the SRS to deploy when deployment conditions are met.

These DTCs are recorded when a malfunction is detected in the driver side knee airbag squib circuit.

DTC Code Detection Condition Trouble Area
B1860/64

One of the following conditions is met:


  • The center airbag sensor assembly receives a line short circuit signal 5 times in the driver side knee airbag squib circuit during the primary check.

  • Driver side knee airbag squib malfunction

  • Center airbag sensor assembly malfunction

  • Instrument panel wire

  • Driver side knee airbag assembly (Driver side knee squib)

  • Center airbag sensor assembly
B1861/64

One of the following conditions is met:


  • The center airbag sensor assembly receives an open circuit signal in the driver side knee airbag squib circuit for 2 seconds.

  • Driver side knee airbag squib malfunction

  • Center airbag sensor assembly malfunction

  • Instrument panel wire

  • Driver side knee airbag assembly (Driver side knee squib)

  • Center airbag sensor assembly
B1862/64

One of the following conditions is met:


  • The airbag sensor center receives a short circuit to ground signal in the knee airbag (Driver side knee squib) circuit for 0.5 seconds.

  • Driver side knee airbag squib malfunction

  • Center airbag sensor assembly malfunction

  • Instrument panel wire

  • Driver side knee airbag assembly (Driver side knee squib)

  • Center airbag sensor assembly
B1863/64

One of the following conditions is met:


  • The airbag sensor center receives a short circuit to B+ signal in the knee airbag (Driver side squib) circuit for 0.5 seconds.

  • Driver side knee airbag squib malfunction

  • Center airbag sensor assembly malfunction

  • Instrument panel wire

  • Driver side knee airbag assembly (Driver side knee squib)

  • Center airbag sensor assembly

WIRING DIAGRAM

A000VW5E49
*a Driver Side Knee Airbag
*b Center 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.

  • 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


  • Perform the simulation method by selecting "check mode" (signal check) with the intelligent tester 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 various types of roads Click here.

PROCEDURE


  1. CHECK DRIVER SIDE KNEE AIRBAG (DRIVER SIDE KNEE SQUIB)

    A000Z7CE04
    *1 Center Airbag Sensor Assembly
    *2 Driver Side Knee Squib
    *3 Front view of wire harness connector: (to Driver Side Knee Squib)
    *4 Connector C

    1. Turn the power switch OFF.

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

    3. Disconnect the connector from the driver side knee airbag.

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

      CAUTION:

      Never connect the tester to the driver side knee airbag (driver side knee 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.

      SST
      09843-18061

    5. Connect the negative (-) terminal cable to the auxiliary battery, 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 B1860, B1861, B1862 or B1863 is not output.

      Tech Tips

      Codes other than DTC B1860, B1861, B1862 and B1863 may be output at this time, but they are not related to this check.


    OK

    REPLACE DRIVER SIDE KNEE AIRBAG ASSEMBLY Click here

    NG

  2. CHECK CONNECTOR


    1. Turn the power switch OFF.

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

    3. Disconnect SST from connector C.

    4. Check that the instrument panel wire connector (on the driver side knee airbag side) is not damaged.

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

    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  3. CHECK INSTRUMENT PANEL WIRE (DRIVER SIDE KNEE AIRBAG CIRCUIT)

    A000UNUE03

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

    2. Connect the negative (-) terminal cable to the auxiliary battery, 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
      L7-1 (DK+) - Body ground Power switch ON (IG) Below 1 V
      L7-2 (DK-) - Body ground Power switch ON (IG) Below 1 V

    5. Turn the power switch OFF.

    6. Disconnect the negative (-) terminal cable from the auxiliary battery, 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
      L7-1 (DK+) - L7-2 (DK-) 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
      L7-1 (DK+) - L7-2 (DK-) Always 1 MΩ or higher
      L7-1 (DK+) - Body ground Always 1 MΩ or higher
      L7-2 (DK-) - Body ground Always 1 MΩ or higher

    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  4. CHECK CENTER AIRBAG SENSOR ASSEMBLY

    A000W4OE24
    *1 Center Airbag Sensor Assembly
    *2 Driver Side Knee Squib

    1. Connect the connectors to the driver side knee airbag and the center airbag sensor assembly.

    2. Connect the negative (-) terminal cable to the auxiliary battery, 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 B1860, B1861, B1862 or B1863 is not output.

      Tech Tips

      Codes other than DTC B1860, B1861, B1862 and B1863 may be output at this time, but they are not related to this check.


    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here