DTC    B1651/33    Manual Cut off Switch Trouble

for Preparation Click here


DESCRIPTION

The passenger airbag manual cut-off switch circuit consists of parts including the center airbag sensor assembly and the airbag cut-off switch.
DTC B1651/33 is set when a malfunction is detected in the airbag cut-off switch circuit.

DTC No.
DTC Detection Condition
Trouble Area
B1651/33
  1. Center airbag sensor assembly detects line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to B+ signal in airbag cut-off switch circuit for 2 seconds
  1. Airbag cut-off switch malfunction
  1. Center airbag sensor assembly malfunction
  1. Instrument panel wire
  1. Airbag cut-off switch
  1. Center airbag sensor assembly

WIRING DIAGRAM


C145458E08


INSPECTION PROCEDURE

1.CHECK CONNECTION OF CONNECTORS

  1. Turn the ignition switch off.

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

  1. Check that the connectors are properly connected to the center airbag sensor assembly and the airbag cut-off switch.

    OK:
    The connectors are properly connected.



NG
CONNECT CONNECTORS PROPERLY
OK


2.CHECK CONNECTORS

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

  1. Check that the connectors (on the center airbag sensor assembly side and airbag cut-off switch side) are not damaged.

    OK:
    The connectors are not deformed or damaged.



NG
REPLACE INSTRUMENT PANEL WIRE
OK


3.CHECK AIRBAG CUT-OFF SWITCH
H100191E02

  1. Disconnect the connector from the airbag cut-off switch.

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D48-1 (PMC-) -
    D48-2 (PMC+)
    		OFF
    		80 to 120 Ω
    D48-1 (PMC-) -
    D48-2 (PMC+)
    		ON
    		320 to 480 Ω

    Text in Illustration 
    *1
    		Component without harness connected
    (Airbag Cut-off Switch)



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


4.CHECK INSTRUMENT PANEL WIRE (CENTER AIRBAG SENSOR - AIRBAG CUT-OFF SWITCH)

C196952E01


Text in Illustration 
*1
Rear view of wire harness connector
(to Airbag Cut-off Switch)
*5
Instrument Panel Wire
*2
Rear view of wire harness connector
(to Center Airbag Sensor Assembly)
*6
Connector C
*3
Airbag Cut-off Switch
*7
Connector B
*4
Center Airbag Sensor Assembly
*8
Service Wire

  1. Disconnect the instrument panel wire connector from the center airbag sensor assembly.

  1. Connect the cable to the negative battery terminal, and wait for at least 2 seconds.

  1. Turn the ignition switch to ON.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D43-11 (MSW+) - Body ground
    		Ignition switch ON
    		Below 1 V
    D43-12 (MSW-) - Body ground
    		Ignition switch ON
    		Below 1 V

  1. Turn the ignition switch off.

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

  1. Using a service wire, connect terminals 2 (PMC+) and 1 (PMC-) of connector C.

    NOTICE:
    Do not forcibly insert a service wire into the terminals of the connector when connecting the wire.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D43-11 (MSW+) - D43-12 (MSW-)
    		Always
    		Below 1 Ω

  1. Disconnect the service wire from connector C.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D43-11 (MSW+) - D43-12 (MSW-)
    		Always
    		1 MΩ or higher
    D43-11 (MSW+) - Body ground
    		Always
    		1 MΩ or higher
    D43-12 (MSW-) - Body ground
    		Always
    		1 MΩ or higher



NG
REPLACE INSTRUMENT PANEL WIRE
OK


5.CHECK CENTER AIRBAG SENSOR ASSEMBLY
C196953E01

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

  1. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

  1. Turn the ignition switch to ON, and wait for at least 60 seconds.

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

  1. Turn the ignition switch off.

  1. Turn the ignition switch to ON, 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
    *2
    		Center Airbag Sensor Assembly

    HINT:
    DTCs other than 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)