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 ECU assembly and airbag cut off switch cylinder sub-assembly.

The instrument panel passenger airbag assembly and lower No. 2 instrument panel 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 and lower No. 2 instrument panel airbag assembly is deactivated, the passenger airbag ON/OFF indicator ("OFF") comes on to inform the passengers.

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 ECU 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 ECU assembly malfunction

  • Instrument panel wire

  • Airbag cut off switch cylinder sub-assembly

  • Airbag ECU assembly

 Does not apply to test/check mode
DTC Detection Conditions
Vehicle Condition
Pattern 1 Pattern 2 Pattern 3
Diagnosis Condition - - - -
Malfunction Status The airbag ECU 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 ECU assembly malfunction - - ○
Detection Time - - -
Number of Trips 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

B002ET5E17
*a Airbag Cut Off Switch Cylinder Sub-assembly
*b Airbag ECU Assembly

CAUTION / NOTICE / HINT

Note


  • After turning the engine 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.

    Click here

  • When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected.

    Click here

  • After replacing the airbag ECU assembly, refer to initialization.

    Click here

Tech Tips

Terminals K43-11 (MSW+) and K43-12 (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. 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 engine switch off.

    2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

    3. Check that the connectors are properly connected to the airbag ECU 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 ECU 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.

    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.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  2. CHECK INSTRUMENT PANEL WIRE (OPEN)


    1. B002EOZC10
      *1 Airbag Cut Off Switch Cylinder Sub-assembly
      *2 Airbag ECU 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
      K73-2 (PMC+) - K73-1 (PMC-) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  3. CHECK INSTRUMENT PANEL WIRE (SHORT)


    1. B002EOZC10
      *1 Airbag Cut Off Switch Cylinder Sub-assembly
      *2 Airbag ECU 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
      K73-2 (PMC+) - K73-1 (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. B002EOZC10
      *1 Airbag Cut Off Switch Cylinder Sub-assembly
      *2 Airbag ECU 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 engine switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      K73-2 (PMC+) - Body ground Engine switch on (IG) Below 1 V
      K73-1 (PMC-) - Body ground Engine switch on (IG) Below 1 V

    4. Turn the engine switch off.

    5. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  5. CHECK INSTRUMENT PANEL WIRE (SHORT TO GROUND)


    1. B002EOZC10
      *1 Airbag Cut Off Switch Cylinder Sub-assembly
      *2 Airbag ECU 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
      K73-2 (PMC+) - Body ground Always 1 MΩ or higher
      K73-1 (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

    REPLACE INSTRUMENT PANEL WIRE

    OK

  6. CHECK AIRBAG CUT OFF SWITCH CYLINDER SUB-ASSEMBLY


    1. Remove the airbag cutoff switch cylinder sub-assembly.

      Click here

    2. B002EOSC12
      *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 Switch 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

    REPLACE AIRBAG CUT OFF SWITCH CYLINDER SUB-ASSEMBLY Click here

    OK

  7. CHECK DTC


    1. B002ELGC07
      *1 Airbag Cut Off Switch Cylinder Sub-assembly
      *2 Airbag ECU Assembly

      Connect the connectors to the airbag ECU 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 engine switch off.

    5. Turn the engine 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

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE AIRBAG ECU ASSEMBLY Click here