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)  B1825  Short in Side Squib (LH) Circuit  B1826  Open in Side Squib (LH) Circuit  B1827  Short in Side Squib (LH) Circuit (to Ground)  B1828  Short in Side Squib (LH) Circuit (to +B)  


DESCRIPTION

The front side squib LH circuit consists of the airbag sensor with ECU assembly and front seat airbag assembly LH.

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 front side squib LH circuit.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Test Mode / Check Mode
B1825 Short in Side Squib (LH) Circuit
·

The airbag sensor with ECU assembly detects a line short in the front side squib LH circuit during the primary check.

·

Front side squib LH malfunction

·

Airbag sensor with ECU assembly malfunction


·

Floor wire

·

Front side squib LH (Front seat airbag assembly LH)

·

Airbag sensor with ECU assembly


Comes on Applies to check mode
B1826 Open in Side Squib (LH) Circuit
·

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

·

Front side squib LH malfunction

·

Airbag sensor with ECU assembly malfunction


·

Floor wire

·

Front side squib LH (Front seat airbag assembly LH)

·

Airbag sensor with ECU assembly


Comes on Applies to check mode
B1827 Short in Side Squib (LH) Circuit (to Ground)
·

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

·

Front side squib LH malfunction

·

Airbag sensor with ECU assembly malfunction


·

Floor wire

·

Front side squib LH (Front seat airbag assembly LH)

·

Airbag sensor with ECU assembly


Comes on Applies to check mode
B1828 Short in Side Squib (LH) Circuit (to +B)
·

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

·

Front side squib LH malfunction

·

Airbag sensor with ECU assembly malfunction


·

Floor wire

·

Front side squib LH (Front seat airbag assembly LH)

·

Airbag sensor with ECU assembly


Comes on Applies to check mode

WIRING DIAGRAM

B512392E80
4.906,2.917 5.469,3.177 0.563,0.26 10 false O1 4.906,3.094 7.104,3.385 2.198,0.292 10 false Airbag Sensor with ECU Assembly 4.958,1.323 5.521,1.583 0.563,0.26 10 false SFL+ 4.958,1.896 5.521,2.156 0.563,0.26 10 false SFL- 4.698,1.323 5.26,1.583 0.563,0.26 10 false 16 4.698,1.896 5.26,2.156 0.563,0.26 10 false 15 2.083,1.323 2.646,1.583 0.563,0.26 10 false 1 1.646,1.323 2.302,1.635 0.656,0.313 10 false SFL+ 1.677,1.885 2.333,2.198 0.656,0.313 10 false SFL- 2.083,1.885 2.74,2.198 0.656,0.313 10 false 2 0.865,2.406 1.521,2.719 0.656,0.313 10 false Oe1 0.865,2.583 2.906,2.958 2.042,0.375 10 false Front Side Squib LH (Front Seat Airbag Assembly LH)

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.
C238350C01
0.521,1.021 0.521,1.635 false 1.385,0.896 1.385,0.469 1.385,0.469 1.615,0.469 false 0.646,0.875 0.865,1.167 0.219,0.292 10 D 1.052,0.875 1.417,1.281 0.365,0.406 10 C 1.625,0.875 1.938,1.26 0.313,0.385 10 B 2.021,0.875 2.281,1.26 0.26,0.385 10 A 2.469,1.188 2.771,1.625 0.302,0.438 10 *2 0.448,1.656 0.896,1.99 0.448,0.333 10 *1 1.646,0.385 1.969,0.677 0.323,0.292 10 *3
*1 Front Seat Airbag Assembly LH
*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 airbag assembly LH 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 airbag assembly LH 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 AIRBAG ASSEMBLY LH

NG

REPLACE FLOOR WIRE

2.CHECK FRONT SEAT AIRBAG ASSEMBLY LH
a.
C295801C37
0.448,2.146 0.813,2.396 0.365,0.25 0.594,0.885 0.594,0.552 false 2.208,2.448 2.542,2.448 false 0.521,0.917 0.844,1.188 0.323,0.271 10 false *1 2.5,0.74 2.875,1.063 0.375,0.323 10 false *2 0.333,1.615 0.667,2.031 0.333,0.417 10 false *a 2.583,2.354 2.917,2.771 0.333,0.417 10 false SST 0.5,2.188 0.927,2.552 0.427,0.365 10 false Oe1 2.021,0.406 2.396,0.729 0.375,0.323 10 false A 1.854,0.406 2.229,0.729 0.375,0.323 10 false B 1.104,0.406 1.479,0.729 0.375,0.323 10 false C 0.729,0.406 1.104,0.729 0.375,0.323 10 false D
*1 Front Seat Airbag Assembly LH
*2 Airbag Sensor with ECU Assembly
*a Front view of wire harness connector
(to Front Seat Airbag Assembly LH)


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 airbag assembly LH 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 B1825, B1826, B1827 or B1828 is not output.


HINT:

Codes other than DTCs B1825, B1826, B1827 and B1828 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 AIRBAG ASSEMBLY LH

Click hereVehicle Interior>SUPPLEMENTAL RESTRAINT SYSTEMS>FRONT SEAT SIDE AIRBAG ASSEMBLY>REMOVAL


NG

3.CHECK FLOOR WIRE
3.CHECK FLOOR WIRE
a.
C238352C52
0.521,2.385 0.885,2.625 0.365,0.24 1.406,2.594 1.115,2.854 false 1.875,2.844 1.583,2.583 false 0.563,0.729 0.563,1.177 false 1.375,0.583 1.375,0.198 1.375,0.198 1.531,0.198 false 0.677,0.573 0.896,0.802 0.219,0.229 10 false D 1.063,0.573 1.354,0.854 0.292,0.281 10 false C 1.583,0.573 1.865,0.958 0.281,0.385 10 false B 1.979,0.573 2.208,0.906 0.229,0.333 10 false A 2.406,0.875 2.75,1.25 0.344,0.375 10 false *2 0.5,1.177 0.875,1.469 0.375,0.292 10 false *1 0.313,1.719 0.604,2.01 0.292,0.292 10 false *a 1.854,2.854 2.354,3.125 0.5,0.271 10 false SFL- 0.813,2.854 1.281,3.083 0.469,0.229 10 false SFL+ 1.552,0.115 1.906,0.438 0.354,0.323 10 false *3 0.573,2.417 1.073,2.844 0.5,0.427 10 false Oe1
*1 Front Seat Airbag Assembly LH
*2 Airbag Sensor with ECU Assembly
*3 Floor Wire
*a Front view of wire harness connector
(to Front Seat Airbag Assembly LH)


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
Oe1-1 (SFL+) - Body ground Ignition switch ON Below 1 V
Oe1-2 (SFL-) - 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
Oe1-1 (SFL+) - Oe1-2 (SFL-) 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
Oe1-1 (SFL+) - Body ground Always 1 MΩ or higher
Oe1-2 (SFL-) - 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
Oe1-1 (SFL+) - Oe1-2 (SFL-) 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.
C238353C01
0.802,0.833 0.802,1.156 false 0.938,0.708 1.542,1.438 0.604,0.729 10 false D 1.083,0.708 1.49,1.177 0.406,0.469 10 false C 1.594,0.708 1.885,1.094 0.292,0.385 10 false B 1.75,0.708 2.073,1 0.323,0.292 10 false A 2.188,1.021 2.49,1.354 0.302,0.333 10 false *2 0.74,1.167 1.115,1.521 0.375,0.354 10 false *1
*1 Front Seat Airbag Assembly LH
*2 Airbag Sensor with ECU Assembly


Connect the connectors to the front seat airbag assembly LH 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 B1825, B1826, B1827 or B1828 is not output.


HINT:

Codes other than DTCs B1825, B1826, B1827 and B1828 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