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 without door 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 without door 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

Any of the following conditions is met:


  • The airbag sensor assembly detects a line short, in the airbag cut off switch circuit.

  • The airbag sensor assembly detects a short to ground in the airbag cut off switch circuit.

  • The airbag sensor assembly detects a short to B+ in the airbag cut off switch circuit.

  • The airbag sensor assembly detects 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
DTC Detection Conditions:
Vehicle Condition
Pattern 1 Pattern 2 Pattern 3 Pattern 4 Pattern 5 Pattern 6
Diagnosis Condition Power switch on (IG)
Malfunction Status The airbag sensor assembly detects a line short, in the airbag cut off switch circuit - - - - -
The airbag sensor assembly detects a short to ground in the airbag cut off switch circuit - - - - -
The airbag sensor assembly detects a short to B+ in the airbag cut off switch circuit - - - - -
The airbag sensor assembly detects an open in the airbag cut off switch circuit - - - - -
Airbag cut off switch cylinder sub-assembly malfunction - - - - -
Airbag sensor assembly malfunction - - - - -
Detection Time - - - - - -
Number of Trips 1 trip 1 trip 1 trip 1 trip 1 trip 1 trip

Tech Tips

DTC will be output when conditions for either of the patterns in the table above are met.

WIRING DIAGRAM

A001RS4E23
*a Airbag Cut Off Switch Cylinder Sub-assembly
*b 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

Tech Tips

Terminals F70-11 (MSW+) and F70-12 (MSW-) of the instrument panel wire in this circuit have an activation prevention mechanism.

This mechanism can be used to check for an open circuit in the wire harness. When performing 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 (-) auxiliary battery terminal.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary 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.

      Tech Tips

      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 deformed or damaged.

      OK
      The terminals are not deformed or damaged.
    6. Check that the short springs of the activation prevention mechanism of the instrument panel wire connector are not deformed or damaged.

      OK
      The short springs are not deformed or damaged.
      Result
      Proceed to
      OK
      NG

    NG
    OK
  2. CHECK INSTRUMENT PANEL WIRE (OPEN)


    1. A001P35C01
      *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
      F64-2 (PMC+) - F64-1 (PMC-) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG
    OK
  3. CHECK INSTRUMENT PANEL WIRE (SHORT)


    1. A001P35C01
      *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)

      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
      F64-2 (PMC+) - F64-1 (PMC-) Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

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


    1. A001P35C01
      *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 (-) auxiliary 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
      F64-2 (PMC+) - Body ground Power switch on (IG) Below 1 V
      F64-1 (PMC-) - Body ground Power switch on (IG) Below 1 V
    4. Turn the power switch off.

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

      CAUTION:

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

      Result
      Proceed to
      OK
      NG

    NG
    OK
  5. CHECK INSTRUMENT PANEL WIRE (SHORT TO GROUND)


    1. A001P35C01
      *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
      F64-2 (PMC+) - Body ground Always 1 MΩ or higher
      F64-1 (PMC-) - Body ground Always 1 MΩ or higher
    2. Restore the released activation prevention mechanism of connector B to the original condition.

      Result
      Proceed to
      OK
      NG

    NG
    OK
  6. CHECK AIRBAG CUT OFF SWITCH CYLINDER SUB-ASSEMBLY


    1. A001RKOC17
      *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
      2 (PMC+) - 1 (PMC-) Cut off switch in ON position 360 to 440 Ω
      2 (PMC+) - 1 (PMC-) Cut off switch in OFF position 90 to 110 Ω
      Result
      Proceed to
      OK
      NG

    NG
    OK
  7. CHECK DTC


    1. A001QNUC01
      *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 (-) auxiliary battery terminal.

    3. Clear the DTCs stored in memory.

      Click here


      Body Electrical > SRS Airbag > Clear DTCs
    4. Turn the power switch off.

    5. Turn the power switch on (IG), 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.

      Tech Tips

      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
    NG