RM3660EC _58 Vehicle Interior _080741 SUPPLEMENTAL RESTRAINT SYSTEMS _0610731 AIRBAG SYSTEM(for NR Series Engine) C

SUPPLEMENTAL RESTRAINT SYSTEMS  AIRBAG SYSTEM(for NR Series Engine)  B1875  Short in Passenger Side Front Seat Cushion Squib Circuit  B1876  Open in Passenger Side Front Seat Cushion Squib Circuit  B1877  Short to GND in Passenger Side Front Seat Cushion Squib Circuit  B1878  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 with ECU assembly and front seat cushion airbag assembly RH.

The airbag sensor with ECU 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 Warning Indicate Test Mode / Check Mode
B1875 Short in Passenger Side Front Seat Cushion Squib Circuit
·

The airbag sensor with ECU 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 with ECU assembly malfunction


·

Floor wire

·

Passenger side front seat cushion squib (Front seat cushion airbag assembly RH)

·

Airbag sensor with ECU assembly


Comes on Applies to check mode
B1876 Open in Passenger Side Front Seat Cushion Squib Circuit
·

The airbag sensor with ECU assembly detects an open in the passenger side front seat cushion squib circuit.

·

Passenger side front seat cushion squib malfunction

·

Airbag sensor with ECU assembly malfunction


·

Floor wire

·

Passenger side front seat cushion squib (Front seat cushion airbag assembly RH)

·

Airbag sensor with ECU assembly


Comes on Applies to check mode
B1877 Short to GND in Passenger Side Front Seat Cushion Squib Circuit
·

The airbag sensor with ECU assembly detects a short to ground in the passenger side front seat cushion squib circuit.

·

Passenger side front seat cushion squib malfunction

·

Airbag sensor with ECU assembly malfunction


·

Floor wire

·

Passenger side front seat cushion squib (Front seat cushion airbag assembly RH)

·

Airbag sensor with ECU assembly


Comes on Applies to check mode
B1878 Short to B+ in Passenger Side Front Seat Cushion Squib Circuit
·

The airbag sensor with ECU assembly detects a short to B+ in the passenger side front seat cushion squib circuit.

·

Passenger side front seat cushion squib malfunction

·

Airbag sensor with ECU assembly malfunction


·

Floor wire

·

Passenger side front seat cushion squib (Front seat cushion airbag assembly RH)

·

Airbag sensor with ECU assembly


Comes on Applies to check mode

WIRING DIAGRAM

B512392E81
4.896,2.917 5.458,3.177 0.563,0.26 10 false O17 4.896,3.073 7.135,3.385 2.24,0.313 10 false Airbag Sensor with ECU Assembly 4.958,1.323 5.521,1.583 0.563,0.26 10 false FCP+ 4.958,1.896 5.521,2.156 0.563,0.26 10 false FCP- 4.708,1.323 5.271,1.583 0.563,0.26 10 false 13 4.708,1.896 5.271,2.156 0.563,0.26 10 false 14 2.083,1.323 2.646,1.583 0.563,0.26 10 false 2 1.615,1.323 2.271,1.635 0.656,0.313 10 false FCP+ 1.646,1.885 2.302,2.198 0.656,0.313 10 false FCP- 2.083,1.885 2.74,2.198 0.656,0.313 10 false 1 0.865,2.417 1.521,2.729 0.656,0.313 10 false Of1 0.865,2.583 3.573,3.135 2.708,0.552 10 false Passenger Side Front Seat Cushion Squib (Front Seat Cushion Airbag Assembly RH)

CAUTION / NOTICE / HINT

NOTICE:
·

After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) battery terminal.

Click hereGeneral>SETUP>WHEN DISCONNECTING OR RECONNECTING BATTERY TERMINAL>BEFORE DISCONNECTING BATTERY

HINT:

When disconnecting and reconnecting the battery, there is an automatic learning function that completes learning when the respective system is used.

Click hereGeneral>SETUP>WHEN DISCONNECTING OR RECONNECTING BATTERY TERMINAL>AUTOMATIC LEARNING CHART




HINT:
·

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

Click hereVehicle Interior>SUPPLEMENTAL RESTRAINT SYSTEMS>AIRBAG SYSTEM (for NR Series Engine)>CHECK MODE PROCEDURE

·

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.

Click hereGeneral>INTRODUCTION>HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS>HOW TO PROCEED WITH TROUBLESHOOTING



PROCEDURE

1.CHECK CONNECTORS
a.
C238348C01
0.531,1.198 0.531,0.688 0.531,0.688 0.708,0.688 false 1.365,1.198 1.365,0.688 1.365,0.688 1.542,0.688 false 0.656,1.188 1.052,1.438 0.396,0.25 10 D 1.031,1.188 1.354,1.427 0.323,0.24 10 C 1.604,1.188 1.938,1.552 0.333,0.365 10 B 1.99,1.188 2.333,1.542 0.344,0.354 10 A 2.438,0.896 2.75,1.208 0.313,0.313 10 *2 0.76,0.604 1.021,0.854 0.26,0.25 10 *1 1.583,0.604 1.854,0.896 0.271,0.292 10 *3
*1 Front Seat Cushion Airbag Assembly RH
*2 Airbag Sensor with ECU Assembly
*3 Floor Wire


Turn the ignition switch off.


b.

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.



c.

Check that the connectors are properly connected to the front seat cushion airbag assembly RH and airbag sensor with ECU assembly.

OK:

The connectors are properly connected.


HINT:

If the connectors are not properly connected, reconnect the connectors and proceed to the next inspection.



d.

Disconnect the connectors from the front seat cushion airbag assembly RH and airbag sensor with ECU assembly.


e.

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

OK:

The terminals are not deformed or damaged.



f.

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



OK

2.CHECK FRONT SEAT CUSHION AIRBAG ASSEMBLY RH

NG

REPLACE FLOOR WIRE

2.CHECK FRONT SEAT CUSHION AIRBAG ASSEMBLY RH
a.
C249370C19
0.667,2.25 1.052,2.51 0.385,0.26 2.177,2.406 2.385,2.406 false 0.854,0.958 0.854,0.51 0.854,0.51 0.656,0.51 false 0.958,0.948 1.219,1.333 0.26,0.385 10 false D 1.323,0.948 1.563,1.25 0.24,0.302 10 false C 1.823,0.948 2.125,1.396 0.302,0.448 10 false B 1.979,0.948 2.323,1.479 0.344,0.531 10 false A 2.427,0.646 2.781,1.094 0.354,0.448 10 false *2 0.49,0.438 0.875,0.865 0.385,0.427 10 false *1 0.542,1.719 0.906,2.094 0.365,0.375 10 false *a 2.427,2.323 2.875,2.698 0.448,0.375 10 false SST 0.75,2.292 1.135,2.708 0.385,0.417 10 false Of1
*1 Front Seat Cushion Airbag Assembly RH
*2 Airbag Sensor with ECU Assembly
*a Front view of wire harness connector
(to Front Seat Cushion Airbag Assembly RH)


Connect the connector to the airbag sensor with ECU assembly.


b.

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.


NOTICE:
·

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  

c.

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


d.

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


e.

Clear the DTCs stored in memory.

Body Electrical > SRS Airbag > Clear DTCs
50002 188

f.

Turn the ignition switch off.


g.

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


h.

Check for DTCs.

Body Electrical > SRS Airbag > Trouble Codes
50001 188
OK:

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


HINT:

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



i.

Turn the ignition switch off.


j.

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.



k.

Disconnect SST from connector C.


Result:
Proceed to
OK
NG



OK

REPLACE FRONT SEAT CUSHION AIRBAG ASSEMBLY RH

Click hereVehicle Interior>SUPPLEMENTAL RESTRAINT SYSTEMS>SRS SEAT CUSHION AIRBAG ASSEMBLY>REMOVAL


NG

3.CHECK FLOOR WIRE
3.CHECK FLOOR WIRE
a.
C249371C21
0.667,2.167 1.031,2.417 0.365,0.25 0.917,0.99 0.917,0.479 0.917,0.479 0.688,0.479 false 1.625,0.99 1.625,0.479 1.625,0.479 1.406,0.479 false 1.458,2.458 1.146,2.771 true 1.75,2.458 2.063,2.771 true 1.042,0.99 1.688,1.406 0.646,0.417 10 false D 1.354,0.99 1.854,1.448 0.5,0.458 10 false C 1.802,0.99 2.354,1.469 0.552,0.479 10 false B 2.115,0.99 2.531,1.469 0.417,0.479 10 false A 2.521,0.719 2.885,1.167 0.365,0.448 10 false *2 0.521,0.396 1.042,0.771 0.521,0.375 10 false *1 0.417,1.729 0.813,2.031 0.396,0.302 10 false *a 0.969,2.792 1.427,3.094 0.458,0.302 10 false FCP- 1.958,2.792 2.438,3.104 0.479,0.313 10 false FCP+ 1.24,0.396 1.583,0.771 0.344,0.375 10 false *3 0.74,2.208 1.26,2.708 0.521,0.5 10 false Of1
*1 Front Seat Cushion Airbag Assembly RH
*2 Airbag Sensor with ECU 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 with ECU assembly.


b.

Check for a short to B+ in the circuit.

i.

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


ii.

Turn the ignition switch to ON.


iii.

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

Standard Voltage:
Tester Connection Condition Specified Condition
Of1-2 (FCP+) - Body ground Ignition switch ON Below 1 V
Of1-1 (FCP-) - Body ground Ignition switch ON Below 1 V



iv.

Turn the ignition switch off.


v.

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.




c.

Check for an open in the circuit.

i.

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

Standard Resistance:
Tester Connection Condition Specified Condition
Of1-2 (FCP+) - Of1-1 (FCP-) Always Below 1 Ω




d.

Check for a short to ground in the circuit.

i.

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

Standard Resistance:
Tester Connection Condition Specified Condition
Of1-2 (FCP+) - Body ground Always 1 MΩ or higher
Of1-1 (FCP-) - Body ground Always 1 MΩ or higher




e.

Check for a short in the circuit.

i.

Release the activation prevention mechanism built into connector B.

Click hereVehicle Interior>SUPPLEMENTAL RESTRAINT SYSTEMS>AIRBAG SYSTEM (for NR Series Engine)>SYSTEM DESCRIPTION


ii.

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

Standard Resistance:
Tester Connection Condition Specified Condition
Of1-2 (FCP+) - Of1-1 (FCP-) Always 1 MΩ or higher



iii.

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



Result:
Proceed to
OK
NG



OK

4.CHECK DTC

NG

REPLACE FLOOR WIRE

4.CHECK DTC
a.
C238241C01
0.844,1.292 0.844,0.844 0.844,0.844 0.552,0.844 false 0.396,0.781 0.729,1.083 0.333,0.302 10 false *1 0.979,1.302 1.156,1.531 0.177,0.229 10 false D 1.135,1.302 1.344,1.5 0.208,0.198 10 false C 1.583,1.302 1.781,1.5 0.198,0.198 10 false B 1.74,1.302 1.938,1.542 0.198,0.24 10 false A 2.146,1.021 2.438,1.26 0.292,0.24 10 false *2
*1 Front Seat Cushion Airbag Assembly RH
*2 Airbag Sensor with ECU Assembly


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


b.

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


c.

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


d.

Clear the DTCs stored in memory.

Body Electrical > SRS Airbag > Clear DTCs
50002 188

e.

Turn the ignition switch off.


f.

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


g.

Check for DTCs.

Body Electrical > SRS Airbag > Trouble Codes
50001 188
OK:

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


HINT:

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



Result:
Proceed to
OK
NG



OK

USE SIMULATION METHOD TO CHECK

Click hereGeneral>INTRODUCTION>HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS>HOW TO PROCEED WITH TROUBLESHOOTING


NG

REPLACE AIRBAG SENSOR WITH ECU ASSEMBLY

Click hereVehicle Interior>SUPPLEMENTAL RESTRAINT SYSTEMS>CENTER AIRBAG SENSOR ASSEMBLY>REMOVAL