AIRBAG SYSTEM, Diagnostic DTC:B1875/67, B1876/67, B1877/67, B1878/67

DTC Code	DTC Name
B1875/67	Short in Passenger Side Front Seat Cushion Squib Circuit
B1876/67	Open in Passenger Side Front Seat Cushion Squib Circuit
B1877/67	Short to GND in Passenger Side Front Seat Cushion Squib Circuit
B1878/67	Short to B+ in Passenger Side Front Seat Cushion Squib Circuit

DESCRIPTION

The passenger side front seat cushion squib circuit consists of the airbag sensor assembly and front seat cushion airbag assembly RH*1 or front seat cushion airbag assembly LH*2.

The airbag sensor assembly uses this circuit to deploy the airbag when deployment conditions are met.

These DTCs are stored when a malfunction is detected in the passenger side front seat cushion squib circuit.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Test Mode / Check Mode
B1875/67	Short in Passenger Side Front Seat Cushion Squib Circuit	The airbag sensor assembly detects a line short in the passenger side front seat cushion squib circuit during the primary check. Passenger side front seat cushion squib malfunction Airbag sensor assembly malfunction	for LHD: Floor wire Passenger side front seat cushion squib (Front seat cushion airbag assembly RH) Airbag sensor assembly for RHD: No. 2 floor wire Passenger side front seat cushion squib (Front seat cushion airbag assembly LH) Airbag sensor assembly	Applies to check mode
B1876/67	Open in Passenger Side Front Seat Cushion Squib Circuit	The airbag sensor assembly detects an open in the passenger side front seat cushion squib circuit. Passenger side front seat cushion squib malfunction Airbag sensor assembly malfunction	for LHD: Floor wire Passenger side front seat cushion squib (Front seat cushion airbag assembly RH) Airbag sensor assembly for RHD: No. 2 floor wire Passenger side front seat cushion squib (Front seat cushion airbag assembly LH) Airbag sensor assembly	Applies to check mode
B1877/67	Short to GND in Passenger Side Front Seat Cushion Squib Circuit	The airbag sensor assembly detects a short to ground in the passenger side front seat cushion squib circuit. Passenger side front seat cushion squib malfunction Airbag sensor assembly malfunction	for LHD: Floor wire Passenger side front seat cushion squib (Front seat cushion airbag assembly RH) Airbag sensor assembly for RHD: No. 2 floor wire Passenger side front seat cushion squib (Front seat cushion airbag assembly LH) Airbag sensor assembly	Applies to check mode
B1878/67	Short to B+ in Passenger Side Front Seat Cushion Squib Circuit	The airbag sensor assembly detects a short to B+ in the passenger side front seat cushion squib circuit. Passenger side front seat cushion squib malfunction Airbag sensor assembly malfunction	for LHD: Floor wire Passenger side front seat cushion squib (Front seat cushion airbag assembly RH) Airbag sensor assembly for RHD: No. 2 floor wire Passenger side front seat cushion squib (Front seat cushion airbag assembly LH) Airbag sensor assembly	Applies to check mode

*1: for LHD
*2: for RHD

WIRING DIAGRAM

for LHD:


*a	Rr1
*b	Passenger Side Front Seat Cushion Squib (Front Seat Cushion Airbag Assembly RH)
*c	Airbag Sensor Assembly

for RHD:


*a	Su1
*b	Passenger Side Front Seat Cushion Squib (Front Seat Cushion Airbag Assembly LH)
*c	Airbag Sensor Assembly

CAUTION / NOTICE / HINT

Note

After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

Click here

Tech Tips

Perform the simulation method by selecting check mode (Signal Check) using the GTS.

Click here
After selecting check mode (Signal Check), perform the simulation method by wiggling each connector of the airbag system or driving the vehicle on a city road or rough road.

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PROCEDURE

CHECK VEHICLE CONDITION

Choose the model to be inspected.

Result

Result	Proceed to
LHD	A
RHD	B

CHECK CONNECTORS Click here

CHECK CONNECTORS

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

Turn the engine switch off.

Disconnect the cable from the negative (-) battery terminal.

CAUTION:

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 front seat cushion airbag assembly RH and airbag sensor assembly.

OK

The connectors are properly connected.

Tech Tips

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

OK

The terminals are not deformed or damaged.

OK
The connectors are properly connected.

OK
The terminals are not deformed or damaged.

Check that the short springs of the activation prevention mechanism of the floor wire connector are not deformed or damaged.

OK
The short springs are not deformed or damaged.

Result

Proceed to
OK
NG

REPLACE FLOOR WIRE

CHECK FRONT SEAT CUSHION AIRBAG ASSEMBLY RH

Front Seat Cushion Airbag Assembly RH

Airbag Sensor Assembly

Front view of wire harness connector

(to Front Seat Cushion Airbag Assembly RH)

Connect the connector to the airbag sensor assembly.

Connect SST (resistance 2.1 Ω) to connector C.

CAUTION:

Never connect a 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 it.
- Insert SST straight into the terminals of the connector.
SST

09843-18061
Connect the cable to the negative (-) battery terminal.
Clear the DTCs stored in memory.

Click here

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

Click here

Body Electrical > SRS Airbag > Trouble Codes

OK

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

Tech Tips

Codes other than DTCs B1875/67, B1876/67, B1877/67 and B1878/67 may be output at this time, but they are not related to this check.
Turn the engine switch off.
Disconnect the cable from the negative (-) battery terminal.

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

Disconnect SST from connector C.

Result

Proceed to
OK
NG

REPLACE FRONT SEAT CUSHION AIRBAG ASSEMBLY RH Click here

CHECK FLOOR WIRE

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

Disconnect the floor wire from the airbag sensor assembly.

Check for a short to B+ in the circuit.

Connect the cable to the negative (-) battery terminal.
Turn the engine switch on (IG).

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

Standard Voltage

Tester Connection	Condition	Specified Condition
Rr1-1 (FCP+) - Body ground	Engine switch on (IG)	Below 1 V
Rr1-2 (FCP-) - Body ground	Engine switch on (IG)	Below 1 V

Turn the engine switch off.
Disconnect the cable from the negative (-) battery terminal.

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

Check for an open in the circuit.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
Rr1-1 (FCP+) - Rr1-2 (FCP-)	Always	Below 1 Ω

Check for a short to ground in the circuit.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
Rr1-1 (FCP+) - Body ground	Always	1 MΩ or higher
Rr1-2 (FCP-) - Body ground	Always	1 MΩ or higher

Check for a short in the circuit.

Release the activation prevention mechanism built into connector B.

Click here

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

Standard Resistance

Tester Connection	Condition	Specified Condition
Rr1-1 (FCP+) - Rr1-2 (FCP-)	Always	1 MΩ or higher

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

Result

Proceed to
OK
NG

REPLACE FLOOR WIRE

CHECK DTC

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

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

Connect the cable to the negative (-) battery terminal.
Clear the DTCs stored in memory.

Click here

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

Check for DTCs.

Click here

Body Electrical > SRS Airbag > Trouble Codes

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

Tech Tips

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

Result

Proceed to
OK
NG

USE SIMULATION METHOD TO CHECK Click here

REPLACE AIRBAG SENSOR ASSEMBLY Click here

CHECK CONNECTORS

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

Turn the engine switch off.

Disconnect the cable from the negative (-) battery terminal.

CAUTION:

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 front seat cushion airbag assembly LH and airbag sensor assembly.

OK

The connectors are properly connected.

Tech Tips

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

OK

The terminals are not deformed or damaged.

OK
The connectors are properly connected.

OK
The terminals are not deformed or damaged.

Check that the short springs of the activation prevention mechanism of the No. 2 floor wire connector are not deformed or damaged.

OK
The short springs are not deformed or damaged.

Result

Proceed to
OK
NG

REPLACE NO. 2 FLOOR WIRE

CHECK FRONT SEAT CUSHION AIRBAG ASSEMBLY LH

Front Seat Cushion Airbag Assembly LH

Airbag Sensor Assembly

Front view of wire harness connector

(to Front Seat Cushion Airbag Assembly LH)

Connect the connector to the airbag sensor assembly.

Connect SST (resistance 2.1 Ω) to connector C.

CAUTION:

Never connect a tester to the front seat cushion airbag assembly LH 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 it.
- Insert SST straight into the terminals of the connector.
SST

09843-18061
Connect the cable to the negative (-) battery terminal.
Clear the DTCs stored in memory.

Click here

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

Click here

Body Electrical > SRS Airbag > Trouble Codes

OK

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

Tech Tips

Codes other than DTCs B1875/67, B1876/67, B1877/67 and B1878/67 may be output at this time, but they are not related to this check.
Turn the engine switch off.
Disconnect the cable from the negative (-) battery terminal.

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

Disconnect SST from connector C.

Result

Proceed to
OK
NG

REPLACE FRONT SEAT CUSHION AIRBAG ASSEMBLY LH Click here

CHECK NO. 2 FLOOR WIRE

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

Disconnect the No. 2 floor wire from the airbag sensor assembly.

Check for a short to B+ in the circuit.

Connect the cable to the negative (-) battery terminal.
Turn the engine switch on (IG).

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

Standard Voltage

Tester Connection	Condition	Specified Condition
Su1-1 (FCP+) - Body ground	Engine switch on (IG)	Below 1 V
Su1-2 (FCP-) - Body ground	Engine switch on (IG)	Below 1 V

Turn the engine switch off.
Disconnect the cable from the negative (-) battery terminal.

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

Check for an open in the circuit.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
Su1-1 (FCP+) - Su1-2 (FCP-)	Always	Below 1 Ω

Check for a short to ground in the circuit.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
Su1-1 (FCP+) - Body ground	Always	1 MΩ or higher
Su1-2 (FCP-) - Body ground	Always	1 MΩ or higher

Check for a short in the circuit.

Release the activation prevention mechanism built into connector B.

Click here

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

Standard Resistance

Tester Connection	Condition	Specified Condition
Su1-1 (FCP+) - Su1-2 (FCP-)	Always	1 MΩ or higher

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

Result

Proceed to
OK
NG

REPLACE NO. 2 FLOOR WIRE

CHECK DTC

*1	Front Seat Cushion Airbag Assembly LH
*2	Airbag Sensor Assembly

Connect the connectors to the front seat cushion airbag assembly LH and airbag sensor assembly.

Connect the cable to the negative (-) battery terminal.
Clear the DTCs stored in memory.

Click here

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

Check for DTCs.

Click here

Body Electrical > SRS Airbag > Trouble Codes

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

Tech Tips

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

Result

Proceed to
OK
NG

USE SIMULATION METHOD TO CHECK Click here

REPLACE AIRBAG SENSOR ASSEMBLY Click here