AIRBAG SYSTEM, Diagnostic DTC:B1651/33

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

DESCRIPTION

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

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

If the instrument panel passenger airbag assembly is deactivated, the passenger airbag ON/OFF indicator ("OFF") comes on to inform the driver.

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

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Test Mode / Check Mode

B1651/33

Manual Cut off Switch Trouble

  • The airbag sensor assembly detects a line short, short to ground or B+, or an open in the airbag cut off switch circuit.

  • Airbag cut off switch cylinder sub-assembly malfunction

  • Airbag sensor assembly malfunction

  • Instrument panel wire

  • Airbag cut off switch cylinder sub-assembly

  • Airbag sensor assembly

Does not apply to test/check mode

WIRING DIAGRAM

C263693E08

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.

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PROCEDURE

  1. CHECK CONNECTORS

    1. Turn the ignition switch off.

    2. Disconnect the cable from the negative (-) battery terminal.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

    3. Check that the connectors are properly connected to the airbag sensor assembly and airbag cut off switch cylinder sub-assembly.

      OK

      The connectors are properly connected.

      Tip:

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

    4. Disconnect the connectors from the airbag sensor assembly and airbag cut off switch cylinder sub-assembly.

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

      OK

      The terminals are not deformed or damaged.

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  2. CHECK INSTRUMENT PANEL WIRE (OPEN)

    1. C303982C01

      *1

      Airbag Cut Off Switch Cylinder Sub-assembly

      *2

      Airbag Sensor Assembly

      *3

      Instrument Panel Wire

      *4

      Service Wire

      *a

      Front view of wire harness connector

      (to Airbag Sensor Assembly)

      *b

      Front view of wire harness connector

      (to Airbag Cut Off Switch Cylinder Sub-assembly)

      Using a service wire, connect terminals 9 (MSW+) and 8 (MSW-) of connector B.

      Note:

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

      Tip:

      Connect the terminals with the holder of connector B removed.

      Click hereClick here

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      E41-6 (PMC+) - E41-3 (PMC-)

      Always

      Below 1 Ω

    3. Disconnect the service wire from connector B.

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  3. CHECK INSTRUMENT PANEL WIRE (SHORT)

    1. C303985C01

      *1

      Airbag Cut Off Switch Cylinder Sub-assembly

      *2

      Airbag Sensor Assembly

      *3

      Instrument Panel Wire

      *a

      Front view of wire harness connector

      (to Airbag Cut Off Switch Cylinder Sub-assembly)

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      E41-6 (PMC+) - E41-3 (PMC-)

      Always

      1 MΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  4. CHECK INSTRUMENT PANEL WIRE (SHORT TO B+)

    1. C303985C01

      *1

      Airbag Cut Off Switch Cylinder Sub-assembly

      *2

      Airbag Sensor Assembly

      *3

      Instrument Panel Wire

      *a

      Front view of wire harness connector

      (to Airbag Cut Off Switch Cylinder Sub-assembly)

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

    2. Turn the ignition switch to ON.

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      E41-6 (PMC+) - Body ground

      Ignition switch ON

      Below 1 V

      E41-3 (PMC-) - Body ground

      Ignition switch ON

      Below 1 V

    4. Turn the ignition switch off.

    5. Disconnect the cable from the negative (-) battery terminal.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  5. CHECK INSTRUMENT PANEL WIRE (SHORT TO GROUND)

    1. C303985C01

      *1

      Airbag Cut Off Switch Cylinder Sub-assembly

      *2

      Airbag Sensor Assembly

      *3

      Instrument Panel Wire

      *a

      Front view of wire harness connector

      (to Airbag Cut Off Switch Cylinder Sub-assembly)

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      E41-6 (PMC+) - Body ground

      Always

      1 MΩ or higher

      E41-3 (PMC-) - Body ground

      Always

      1 MΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  6. CHECK AIRBAG CUT OFF SWITCH CYLINDER SUB-ASSEMBLY

    1. C302028C01

      *a

      Component without harness connected

      (Airbag Cut Off Switch Cylinder Sub-assembly)

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      6 (PMC+) - 3 (PMC-)

      Cut off switch ON

      360 to 440 Ω

      6 (PMC+) - 3 (PMC-)

      Cut off switch OFF

      90 to 110 Ω

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE AIRBAG CUT OFF SWITCH CYLINDER SUB-ASSEMBLY

    Click here

    OK

  7. CHECK DTC

    1. C303984C01

      *1

      Airbag Cut Off Switch Cylinder Sub-assembly

      *2

      Airbag Sensor Assembly

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

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

    3. Clear the DTCs stored in memory.

      Click here

      Body Electrical > SRS Airbag > Clear DTCs

    4. Turn the ignition switch off.

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

    6. Check for DTCs.

      Click here

      Body Electrical > SRS Airbag > Trouble Codes

      OK

      DTC B1651/33 is not output.

      Tip:

      Codes other than DTC B1651/33 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

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    NG

    REPLACE AIRBAG SENSOR ASSEMBLY

    Click here