DTC B1821-55: Open in Side Squib RH Circuit [06/2015 - ]: Procedure

CHECK CONNECTORS

Turn the power switch off.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*1	Front Seat Airbag Assembly RH
*2	Airbag Sensor Assembly
*3	No. 2 Floor Wire

Disconnect the cable from the negative (-) auxiliary battery terminal and wait for at least 90 seconds.
Check that the connectors are properly connected to the front seat airbag assembly RH and airbag sensor assembly.
OK

The connectors are properly connected.

HINT:

If the connectors are not properly connected, reconnect the connectors and proceed to the next inspection.
Disconnect the connectors from the front seat airbag assembly RH and airbag sensor assembly.
Check that the terminals of the connectors are not damaged.
OK

The terminals are not deformed or damaged.

Check that the short spring for the No. 2 floor wire with the activation prevention mechanism is not deformed or damaged.

The short spring is not deformed or damaged.

Result

Proceed to
OK
NG

Result:

REPLACE NO. 2 FLOOR WIRE

Result:

See step 2

CHECK NO. 2 FLOOR WIRE

Check for an open in the circuit.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*1	Front Seat Airbag Assembly RH
*2	Airbag Sensor Assembly
*3	No. 2 Floor Wire
*a	Front view of wire harness connector (to Front Seat Airbag Assembly RH)

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

Standard Resistance

Tester Connection	Condition	Specified Condition
Q2-1 (SFR+) - Q2-2 (SFR-)	Always	Below 1 Ω

Result

Proceed to
OK
NG

Result:

REPLACE NO. 2 FLOOR WIRE

Result:

See step 3

CHECK DTC

Connect the connectors to the airbag sensor assembly.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*1	Front Seat Airbag Assembly RH
*2	Airbag Sensor Assembly
*a	Front view of wire harness connector (to Front Seat Airbag Assembly RH)
*b	Service Wire

Using a service wire, connect terminals 1 (SFR+) and 2 (SFR-) of connector C.
NOTE:
Do not forcibly insert the service wire into the terminals of the connector when connecting the wire.
Connect the cable to the negative (-) auxiliary battery terminal.
Turn the power switch on (IG), and wait for at least 60 seconds.
Clear the DTCs stored in memory.
Refer to DTC CHECK / CLEAR [06/2015 - ]

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 [06/2015 - ]

Body Electrical > SRS Airbag > Trouble Codes

OK

DTC B1821/55 is not output.

HINT:

Codes other than DTC B1821/55 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 the service wire from connector C.

Result

Proceed to
OK
NG

Result:

REPLACE AIRBAG SENSOR ASSEMBLY. Refer to REMOVAL [06/2015 - 11/2018] , or refer to REMOVAL [11/2018 - ]

Result:

See step 4

CHECK DTC

Connect the connectors to the front seat airbag assembly RH.

*1	Front Seat Airbag Assembly RH
*2	Airbag Sensor Assembly

Connect the cable to the negative (-) auxiliary battery terminal.
Turn the power switch on (IG), and wait for at least 60 seconds.
Clear the DTCs stored in memory.
Refer to DTC CHECK / CLEAR [06/2015 - ]

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 [06/2015 - ]

Body Electrical > SRS Airbag > Trouble Codes

DTC B1821/55 is not output.

HINT:

Codes other than DTC B1821/55 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 [06/2015 - 11/2018] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2018 - ]

Result:

REPLACE FRONT SEAT AIRBAG ASSEMBLY RH. Refer to REMOVAL [06/2015 - 11/2018] , or refer to REMOVAL [11/2018 - ]