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 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

WIRING DIAGRAM

A01NFQ4E03

INSPECTION PROCEDURE

Tech Tips

The F29-11 (MSW+) and F29-12 (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+), this mechanism should be released.

PROCEDURE


  1. 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.

      Tech Tips

      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.

    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  2. CHECK INSTRUMENT PANEL WIRE (OPEN)


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

      A01NDUHE02
      Standard Resistance
      Tester Connection Condition Specified Condition
      F85-2 (PMC+) - F85-1 (PMC-) Always Below 1 Ω
      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 - -

    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  3. CHECK INSTRUMENT PANEL WIRE (SHORT)


    1. A01NCLIE02
      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

      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

    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

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


    1. A01NCLIE02
      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

      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

    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  5. CHECK INSTRUMENT PANEL WIRE (SHORT TO GROUND)


    1. A01NCLIE02
      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

      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

    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  6. INSPECT AIRBAG CUT-OFF SWITCH


    1. Remove the airbag cut-off switch Click here.

    2. A01NG9BE02
      Text in Illustration
      *1

      Component without harness connected

      (Airbag Cut-off Switch)

      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

    NG

    REPLACE AIRBAG CUT-OFF SWITCH Click here

    OK

  7. CHECK CENTER AIRBAG SENSOR ASSEMBLY


    1. A01ND6RE08
      Text in Illustration
      *1 Airbag Cut-off Switch
      *2 Center Airbag Sensor Assembly

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

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

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

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

    5. Clear the DTCs stored in the memory Click here.

    6. Turn the power switch off.

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

    8. 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.


    NG

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here