DTC    B1651/33    Manual Cut off Switch Trouble

for Preparation Click here


DESCRIPTION

The airbag cut off switch circuit consists of the airbag sensor assembly and airbag cut off switch cylinder sub-assembly.
The front passenger airbag and front passenger side knee airbag can be optionally deactivated via this circuit by turning the airbag cut off switch cylinder sub-assembly 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 stored when a malfunction is detected in the airbag cut off switch circuit.

DTC No.
DTC Detecting Condition
Trouble Area
B1651/33
  1. The 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.
  2. Airbag cut off switch cylinder sub-assembly malfunction
  3. Airbag sensor assembly malfunction
  1. Instrument panel wire
  2. Airbag cut off switch cylinder sub-assembly
  3. Airbag sensor assembly

WIRING DIAGRAM


C145458E15


INSPECTION PROCEDURE

NOTICE:
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).

HINT:
Terminals H84-11 (MSW+) and H84-12 (MSW-) of the 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.

1.CHECK CONNECTORS

  1. Turn the power switch off.

  1. 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.

  1. 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.

    HINT:
    If the connectors are not connected securely, reconnect the connector and proceed to the next inspection.

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

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

    OK:
    The terminals are not deformed or damaged.

  1. 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)


    C145464E12

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    H134-2 (PMC+) - H134-1 (PMC-)
    		Always
    		Below 1 Ω

    Text in Illustration 
    *1
    		Airbag Cut Off Switch Cylinder Sub-assembly
    *2
    		Airbag Sensor Assembly
    *3
    		Instrument Panel Wire
    *4
    		Connector C
    *a
    		Front view of wire harness connector
    (to Airbag Cut Off Switch Cylinder Sub-assembly)



NG
REPLACE INSTRUMENT PANEL WIRE
OK


3.CHECK INSTRUMENT PANEL WIRE (SHORT)


    C145464E12

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

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    H134-2 (PMC+) - H134-1 (PMC-)
    		Always
    		1 MΩ or higher

    Text in Illustration 
    *1
    		Airbag Cut Off Switch Cylinder Sub-assembly
    *2
    		Airbag Sensor Assembly
    *3
    		Instrument Panel Wire
    *4
    		Connector C
    *a
    		Front view of wire harness connector
    (to Airbag Cut Off Switch Cylinder Sub-assembly)



NG
REPLACE INSTRUMENT PANEL WIRE
OK


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


    C145464E12

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

  1. Turn the power switch on (IG).

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    H134-2 (PMC+) - Body ground
    		Power switch on (IG)
    		Below 1 V
    H134-1 (PMC-) - Body ground
    		Power switch on (IG)
    		Below 1 V

    Text in Illustration 
    *1
    		Airbag Cut Off Switch Cylinder Sub-assembly
    *2
    		Airbag Sensor Assembly
    *3
    		Instrument Panel Wire
    *4
    		Connector C
    *a
    		Front view of wire harness connector
    (to Airbag Cut Off Switch Cylinder Sub-assembly)



NG
REPLACE INSTRUMENT PANEL WIRE
OK


5.CHECK INSTRUMENT PANEL WIRE (SHORT TO GROUND)


    C145464E12

  1. Turn the power switch off.

  1. 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.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    H134-2 (PMC+) - Body ground
    		Always
    		1 MΩ or higher
    H134-1 (PMC-) - Body ground
    		Always
    		1 MΩ or higher

    Text in Illustration 
    *1
    		Airbag Cut Off Switch Cylinder Sub-assembly
    *2
    		Airbag Sensor Assembly
    *3
    		Instrument Panel Wire
    *4
    		Connector C
    *a
    		Front view of wire harness connector
    (to Airbag Cut Off Switch Cylinder Sub-assembly)



NG
REPLACE INSTRUMENT PANEL WIRE
OK


6.CHECK AIRBAG CUT OFF SWITCH CYLINDER SUB-ASSEMBLY


    C234623E02

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    H134-2 (PMC+) - H134-1 (PMC-)
    		Cut off switch is ON
    		360 to 440 Ω
    H134-2 (PMC+) - H134-1 (PMC-)
    		Cut off switch is OFF
    		90 to 110 Ω

    Text in Illustration 
    *a
    		Component without harness connected
    (Airbag Cut Off Switch Cylinder Sub-assembly)



NG
REPLACE AIRBAG CUT OFF SWITCH CYLINDER SUB-ASSEMBLY (Click here)
OK


7.CHECK AIRBAG SENSOR ASSEMBLY


    C126705E01

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

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

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

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

  1. Clear the DTCs stored in memory (Click here).

  1. Turn the power switch off.

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

  1. Check for DTCs (Click here).

    OK:
    DTC B1651/33 is not output.

    Text in Illustration 
    *1
    		Airbag Cut Off Switch Cylinder Sub-assembly
    *2
    		Airbag Sensor Assembly

    HINT:
    Codes other than DTC B1651/33 may be output at this time, but they are not related to this check.



NG
REPLACE AIRBAG SENSOR ASSEMBLY (Click here)
OK

USE SIMULATION METHOD TO CHECK (Click here)