AIRBAG SYSTEM, Diagnostic DTC:B1651/33

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

DESCRIPTION

The manual cut off switch circuit consists of the center airbag sensor assembly and the airbag cut off switch cylinder.

The front passenger airbag can be optionally deactivated via this circuit by turning the manual cut off switch to the OFF position.

If the front passenger airbag is deactivated, the passenger airbag OFF indicator comes on to inform the passengers.

DTC B1651/33 is recorded when a malfunction is detected in the manual cut off switch circuit.

DTC Code Detection Condition Trouble Area
B1651/33

One of the following conditions is met:


  • The center airbag sensor assembly receives a line short circuit signal, an open circuit signal, a short circuit to ground signal or a short circuit to B+ signal in the manual cut off switch circuit for 2 seconds.

  • Manual cut off switch malfunction

  • Center airbag sensor assembly malfunction

  • Instrument panel wire

  • Airbag cut off switch cylinder

  • Center airbag sensor assembly

WIRING DIAGRAM

A000YPNE12
*a Airbag Cut Off Switch Cylinder
*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

The "B" L73-11 (MSW+) and L73-12 (MSW-) connectors 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+), this mechanism should be released.

PROCEDURE


  1. CHECK INSTRUMENT PANEL WIRE (CENTER AIRBAG SENSOR ASSEMBLY - AIRBAG CUT OFF SWITCH CYLINDER)

    A000VCHE02

    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 connectors from the center airbag sensor assembly and the airbag cut off switch cylinder.

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

    5. Turn the power switch ON (IG).

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      L85-2 (PMC+) - Body ground Power switch ON (IG) Below 1 V
      L85-1 (PMC-) - Body ground Power switch ON (IG) Below 1 V

    7. Turn the power switch OFF.

    8. Disconnect the negative (-) terminal cable from the auxiliary battery, 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
      L85-2 (PMC+) - L85-1 (PMC-) Always Below 1 Ω

    10. Release the activation prevention mechanism built into connector "B".

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

      Standard resistance
      Tester Connection Condition Specified Condition
      L85-2 (PMC+) - L85-1 (PMC-) Always 1 MΩ or higher
      L85-2 (PMC+) - Body ground Always 1 MΩ or higher
      L85-1 (PMC-) - Body ground Always 1 MΩ or higher

    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  2. INSPECT AIRBAG CUT OFF SWITCH CYLINDER

    A000X52E09
    *1 Component without harness connected: (Airbag Cut Off Switch Cylinder)

    1. Remove the airbag cut off switch cylinder 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-) Cut off switch is in ON position (Front passenger side airbag is active) 360 to 440 Ω
      2 (PMC+) - 1 (PMC-) Cut off switch is in OFF position (Front passenger side airbag is not active) 90 to 110 Ω

    NG

    REPLACE AIRBAG CUT OFF SWITCH CYLINDER Click here

    OK

  3. CHECK CENTER AIRBAG SENSOR ASSEMBLY

    A000YVRE16
    *1 Airbag Cut Off Switch Cylinder
    *2 Center Airbag Sensor Assembly

    1. Connect the connectors to the center airbag sensor assembly and the airbag cut off switch cylinder.

    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 stored in memory Click here.

    5. Turn the power switch OFF.

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

    7. Check the DTCs Click here.

      OK
      DTC B1651 is not output.

      Tech Tips

      Codes other than DTC B1651 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