DTC B1875-67: Short in Passenger Side Front Seat Cushion Squib Circuit; DTC B1876-67: Open in Passenger Side Front Seat Cushion Squib Circuit; DTC B1877-67: Short to GND in Passenger Side Front Seat Cushion Squib Circuit; DTC B1878-67: Short to B+ in Passenger Side Front Seat Cushion Squib Circuit [10/2014 - 05/2019]: Procedure

CHECK FRONT SEAT CUSHION AIRBAG ASSEMBLY RH

Turn the power switch off.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*1	Front Seat Cushion Airbag Assembly RH
*2	Airbag ECU Assembly
*3	Connector C
*4	SST
*a	Front view of wire harness connector (to Front Seat Cushion Airbag Assembly RH)

Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 90 seconds.
Disconnect the connector from the front seat cushion airbag assembly RH.
Connect the red wire side of SST (resistance: 2.1 Ω) to connector C.
WARNING:
Never connect the tester to the front seat cushion airbag assembly RH for measurement, as this may lead to a serious injury due to airbag deployment.
NOTE:
- Do not forcibly insert SST into the terminals of the connector when connecting SST.
- Insert SST straight into the terminals of the connector.
- SST: 09843-18061
Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
Turn the power switch on (IG), and wait for at least 60 seconds.
Clear the DTCs.
Refer to DTC CHECK / CLEAR [10/2014 - 05/2019]

Body Electrical > SRS Airbag > Clear DTCs
Turn the power switch off.
Turn the power switch on (IG), and wait for at least 60 seconds.

Check for DTCs.

Refer to DTC CHECK / CLEAR [10/2014 - 05/2019]

Body Electrical > SRS Airbag > Trouble Codes

Result

Proceed to
DTC B1875/67, B1876/67, B1877/67 or B1878/67 is not output.
DTC B1875/67, B1876/67, B1877/67 or B1878/67 is output.

HINT:

Codes other than DTC B1875/67, B1876/67, B1877/67 or B1878/67 may be output at this time, but they are not related to this check.

Turn the power switch off.
Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 90 seconds.
Disconnect SST from connector C.

Result:

DTC B1875/67, B1876/67, B1877/67 or B1878/67 is not output.

REPLACE FRONT SEAT CUSHION AIRBAG ASSEMBLY RH. Refer to REMOVAL [10/2014 - 05/2019]

Result:

DTC B1875/67, B1876/67, B1877/67 or B1878/67 is output.

See step 2

CHECK CONNECTORS

Disconnect the connectors from the airbag ECU assembly.

Check that the connectors (on the airbag ECU assembly side and front seat cushion airbag assembly RH side) are not damaged.

The lock button is not disengaged, and the claw of the lock is not damaged or deformed.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*1	Front Seat Cushion Airbag Assembly RH
*2	Floor Wire
*3	Airbag ECU Assembly

Result

Proceed to
OK
NG

Result:

REPLACE FLOOR WIRE

Result:

See step 3

CHECK FLOOR WIRE

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

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*1	Front Seat Cushion Airbag Assembly RH
*2	Airbag ECU Assembly
*3	Floor Wire
*4	Connector C
*a	Front view of wire harness connector (to Front Seat Cushion Airbag Assembly RH)

Turn the power switch on (IG).

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

Standard Voltage

Tester Connection	Switch Condition	Specified Condition
PF1-1 (FCP-) - Body ground	Power switch on (IG)	Below 1 V
PF1-2 (FCP+) - Body ground	Power switch on (IG)	Below 1 V

Turn the power switch off.
Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 90 seconds.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
PF1-1 (FCP-) - PF1-2 (FCP+)	Always	Below 1 Ω

Release the activation prevention mechanism built into connector B.
Refer to DIAGNOSIS SYSTEM [10/2014 - ]

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

Standard Resistance

Tester Connection	Condition	Specified Condition
PF1-1 (FCP-) - PF1-2 (FCP+)	Always	1 MΩ or higher

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

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

Standard Resistance

Tester Connection	Condition	Specified Condition
PF1-1 (FCP-) - Body ground	Always	1 MΩ or higher
PF1-2 (FCP+) - Body ground	Always	1 MΩ or higher

Result

Proceed to
OK
NG

Result:

REPLACE FLOOR WIRE

Result:

See step 4

CHECK DTC

Connect the connectors to the front seat cushion airbag assembly RH and the airbag ECU assembly.

*1	Front Seat Cushion Airbag Assembly RH
*2	Airbag ECU Assembly

Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
Turn the power switch on (IG), and wait for at least 60 seconds.
Clear the DTCs.
Refer to DTC CHECK / CLEAR [10/2014 - 05/2019]

Body Electrical > SRS Airbag > Clear DTCs
Turn the power switch off.
Turn the power switch on (IG), and wait for at least 60 seconds.

Check for DTCs.

Refer to DTC CHECK / CLEAR [10/2014 - 05/2019]

Body Electrical > SRS Airbag > Trouble Codes

Result

Proceed to
DTC B1875/67, B1876/67, B1877/67 or B1878/67 is not output.
DTC B1875/67, B1876/67, B1877/67 or B1878/67 is output.

HINT:

Codes other than DTC B1875/67, B1876/67, B1877/67 or B1878/67 may be output at this time, but they are not related to this check.

Result:

DTC B1875/67, B1876/67, B1877/67 or B1878/67 is not output.

USE SIMULATION METHOD TO CHECK. Refer to DIAGNOSIS SYSTEM [10/2014 - ]

Result:

DTC B1875/67, B1876/67, B1877/67 or B1878/67 is output.

REPLACE AIRBAG ECU ASSEMBLY. Refer to REMOVAL [10/2014 - 05/2019]