DTC B1651: Manual Cut OFF Switch Trouble [09/2019 - ]: Procedure

CHECK CONNECTION OF CONNECTORS

Turn the ignition switch off.
Disconnect the cable from the negative (-) battery terminal.
WARNING:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

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

The connectors are properly connected.

Result

Proceed to
OK
NG

Result:

CONNECT CONNECTORS PROPERLY

Result:

See step 2

CHECK CONNECTORS

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

Check that the terminals of the connectors are not deformed or damaged.

The terminals are not deformed or damaged.

Result

Proceed to
OK
NG

Result:

REPLACE INSTRUMENT PANEL WIRE

Result:

See step 3

CHECK INSTRUMENT PANEL WIRE

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

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Turn the ignition switch to ON.

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	Ignition switch ON	Below 1 V
F64-1 (PMC-) - Body ground	Ignition switch ON	Below 1 V

Turn the ignition switch off.
Disconnect the cable from the negative (-) battery terminal.
WARNING:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
Using a service wire, connect terminals 22 (MSW+) and 21 (MSW-) of connector B.
NOTE:
Do not forcibly insert the service wire into the terminals of the connector when connecting the wire.

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

Disconnect the service wire from connector B.

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
F64-2 (PMC+) - Body ground	Always	1 MΩ or higher
F64-1 (PMC-) - Body ground	Always	1 MΩ or higher

Result

Proceed to
OK
NG

Result:

REPLACE INSTRUMENT PANEL WIRE

Result:

See step 4

INSPECT AIRBAG CUT OFF SWITCH CYLINDER SUB-ASSEMBLY

Remove the airbag cut off switch cylinder sub-assembly.
Refer to REMOVAL [10/2017 - ]

Inspect the airbag cut off switch cylinder sub-assembly.

Refer to INSPECTION [10/2017 - ]

Result

Proceed to
OK
NG

Result:

REPLACE AIRBAG CUT OFF SWITCH CYLINDER SUB-ASSEMBLY. Refer to REMOVAL [10/2017 - ]

Result:

See step 5

CHECK DTC

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

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

Connect the cable to the negative (-) battery terminal.
Turn the ignition switch to ON, and wait for at least 60 seconds.
Clear the DTCs stored in memory.
Body Electrical > SRS Airbag > Clear DTCs
Turn the ignition switch off.
Turn the ignition switch to ON, and wait for at least 60 seconds.

Check for DTCs.

Body Electrical > SRS Airbag > Trouble Codes

DTC B1651 is not output.

HINT:

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

Result

Proceed to
OK
NG

Result:

USE SIMULATION METHOD TO CHECK. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2019 - 08/2020] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [08/2020 - ]

Result:

REPLACE AIRBAG SENSOR ASSEMBLY. Refer to REMOVAL [09/2019 - 08/2020] , or refer to REMOVAL [08/2020 - ]