AIRBAG SYSTEM, Diagnostic DTC:B1651/33

DTC Code DTC Name
B1651/33 Manual Cut off Switch Trouble

DESCRIPTION

Tech Tips

"Manual cutoff switch" refers to the airbag cutoff switch cylinder sub-assembly.

The airbag cutoff switch cylinder sub-assembly circuit consists of the airbag sensor assembly and airbag cutoff switch cylinder sub-assembly.

The instrument panel passenger airbag assembly can be optionally deactivated via this circuit by turning the airbag cutoff switch cylinder sub-assembly to the "OFF" position.

If the instrument panel passenger airbag assembly is deactivated, the airbag cutoff indicator comes on to inform the passengers.

DTC B1651/33 is stored when a malfunction is detected in the airbag cutoff switch cylinder sub-assembly circuit.

DTC Code DTC Detection Condition Trouble Area
B1651/33

One of the following conditions is met:


  • The airbag sensor assembly detects a line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to B+ signal in the airbag cutoff switch cylinder sub-assembly circuit for 2 seconds.

  • An airbag cutoff switch cylinder sub-assembly malfunction.

  • An airbag sensor assembly malfunction.

  • Instrument panel wire

  • Airbag cutoff switch cylinder sub-assembly

  • Airbag sensor assembly

WIRING DIAGRAM

A004SS4E14
*a Airbag Cutoff Switch Cylinder Sub-assembly
*b Airbag Sensor Assembly

CAUTION / NOTICE / HINT

Note


  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices 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.

Tech Tips

The 11 (MSW+) and 12 (MSW-) terminals in this circuit have an activation prevention mechanism. This mechanism can be used to check for an open circuit in the wire harness. In case of other checks (check for short, short to ground or short to B+), it is necessary to release this mechanism.

PROCEDURE


  1. CHECK INSTRUMENT PANEL WIRE (AIRBAG SENSOR ASSEMBLY- AIRBAG CUTOFF SWITCH CYLINDER SUB-ASSEMBLY)


    1. A004QDGE02
      Text in Illustration
      *1 Airbag Cutoff Switch Cylinder Sub-assembly
      *2 Airbag Sensor Assembly
      *3 Connector C
      *4 Connector B
      *a

      Front view of wire harness connector

      (to Airbag Cutoff Switch Cylinder Sub-assembly)
      *b

      Rear view of wire harness connector

      (to Airbag Sensor Assembly)

      Turn the ignition switch off.

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

    3. Disconnect the connectors from the airbag sensor assembly and airbag cutoff switch cylinder sub-assembly.

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

    5. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      D20-2 (PMC+) - Body ground Ignition switch ON Below 1 V
      D20-1 (PMC-) - Body ground Ignition switch ON Below 1 V

    7. Turn the ignition switch off.

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

    9. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      D20-2 (PMC+) - D20-1 (PMC-) Always Below 1 Ω

    10. Release the activation prevention mechanism built into connector B Click here.

    11. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      D20-2 (PMC+) - D20-1 (PMC-) Always 1 MΩ or higher
      D20-2 (PMC+) - Body ground Always 1 MΩ or higher
      D20-1 (PMC-) - Body ground Always 1 MΩ or higher

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


    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  2. INSPECT AIRBAG CUTOFF SWITCH CYLINDER SUB-ASSEMBLY


    1. A004SB7E02

      Remove the airbag cutoff switch cylinder sub-assembly Click here.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      2 (PMC+) - 1 (PMC-) Cutoff switch in "ON" position (Front passenger side airbag active) 360 to 440 Ω
      2 (PMC+) - 1 (PMC-) Cutoff switch in "OFF" position (Front passenger side airbag not active) 90 to 110 Ω

    NG

    REPLACE AIRBAG CUTOFF SWITCH CYLINDER SUB-ASSEMBLY Click here

    OK

  3. CHECK AIRBAG SENSOR ASSEMBLY


    1. A004RSDE01
      Text in Illustration
      *1 Airbag Cutoff Switch Cylinder Sub-assembly
      *2 Airbag Sensor Assembly

      Connect the connectors to the airbag sensor assembly and airbag cutoff switch cylinder sub-assembly.

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

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

    4. Clear the DTCs stored in memory Click here.

    5. Turn the ignition switch off.

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

    7. Check for DTCs Click here.

      OK
      DTC B1651/33 is not output.

      Tech Tips

      Codes other than DTC B1651/33 may be output at this time, but they are not related to this check.


    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE AIRBAG SENSOR ASSEMBLY Click here