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AIRBAG SYSTEM, Diagnostic DTC:B1651/33

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

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

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

If the front passenger airbag and front passenger side knee airbag are deactivated, the passenger airbag ON/OFF indicator ("OFF") comes on to inform the passengers.

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

DTC No. DTC Detecting Condition Trouble Area
B1651/33

  • 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 airbag cut-off switch circuit.

  • Airbag cut-off switch malfunction

  • Center airbag sensor assembly malfunction

  • Instrument panel wire

  • Airbag cut-off switch

  • Center airbag sensor assembly
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WIRING DIAGRAM

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INSPECTION PROCEDURE

Tip:

Terminals F29-11 (MSW+) and F29-12 (MSW-) of the center airbag sensor assembly 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.

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PROCEDURE


  1. Click here

    CHECK CONNECTORS


    1. Turn the power switch off.

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

      Note:

      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 center airbag sensor assembly and airbag cut-off switch.

      OK
      The connectors are properly connected.
      Tip:

      If the connector is not connected securely, reconnect the connector and proceed to the next inspection.

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

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

      OK
      The terminals are not deformed or damaged.

    6. Check that the short spring for the instrument panel wire connector with the activation prevention mechanism is not deformed or damaged.

      OK
      The short spring is not deformed or damaged.

  2. Click here

    CHECK INSTRUMENT PANEL WIRE (OPEN)


    1. A01NJKTE02

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

      Table 1. Text in Illustration
      *1 Airbag Cut-off Switch *2 Center Airbag Sensor Assembly
      *3 Instrument Panel Wire *4

      Front view of wire harness connector

      (to Center Airbag Sensor Assembly)
      *5

      Front view of wire harness connector

      (to Airbag Cut-off Switch)

      		 *6 Connector B
      *7 Connector C - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      F85-2 (PMC+) - F85-1 (PMC-) Always Below 1 Ω

  3. Click here

    CHECK INSTRUMENT PANEL WIRE (SHORT)


    1. A01NKI7E02

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F85-2 (PMC+) - F85-1 (PMC-) Always 1 MΩ or higher
      Table 2. Text in Illustration
      *1 Airbag Cut-off Switch
      *2 Center Airbag Sensor Assembly
      *3 Instrument Panel Wire
      *4

      Front view of wire harness connector

      (to Airbag Cut-off Switch)
      *5 Connector C

  4. Click here

    CHECK INSTRUMENT PANEL WIRE (SHORT TO B+)


    1. A01NKI7E02

      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
      F85-2 (PMC+) - Body ground Power switch on (IG) Below 1 V
      F85-1 (PMC-) - Body ground Power switch on (IG) Below 1 V
      Table 3. Text in Illustration
      *1 Airbag Cut-off Switch
      *2 Center Airbag Sensor Assembly
      *3 Instrument Panel Wire
      *4

      Front view of wire harness connector

      (to Airbag Cut-off Switch)
      *5 Connector C

  5. Click here

    CHECK INSTRUMENT PANEL WIRE (SHORT TO GROUND)


    1. A01NKI7E02

      Turn the power switch off.

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

      Note:

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F85-2 (PMC+) - Body ground Always 1 MΩ or higher
      F85-1 (PMC-) - Body ground Always 1 MΩ or higher

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

      Table 4. Text in Illustration
      *1 Airbag Cut-off Switch
      *2 Center Airbag Sensor Assembly
      *3 Instrument Panel Wire
      *4

      Front view of wire harness connector

      (to Airbag Cut-off Switch)
      *5 Connector C

  6. Click here

    CHECK AIRBAG CUT-OFF SWITCH


    1. A01NJHZE01

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F85-2 (PMC+) - F85-1 (PMC-) Cut off switch is in ON position 360 to 440 Ω
      F85-2 (PMC+) - F85-1 (PMC-) Cut off switch is in OFF position 90 to 110 Ω
      Table 5. Text in Illustration
      *1

      Component without harness connected:

      (Airbag Cut-off Switch)

  7. Click here

    CHECK CENTER AIRBAG SENSOR ASSEMBLY


    1. A01NK34E08

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

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

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

    4. Clear the DTCs stored in the 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 for DTCs (Click here).

      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.

      Table 6. Text in Illustration
      *1 Airbag Cut-off Switch
      *2 Center Airbag Sensor Assembly

  8. Click here

    USE SIMULATION METHOD TO CHECKClick here

  9. Click here

    REPLACE INSTRUMENT PANEL WIRE

  10. Click here

    REPLACE AIRBAG CUT-OFF SWITCHClick here

  11. Click here

    REPLACE CENTER AIRBAG SENSOR ASSEMBLYClick here