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)  B1925  Short in Rear P/T Squib (LH) Circuit  B1926  Open in Rear P/T Squib (LH) Circuit  B1927  Short in Rear P/T Squib (LH) Circuit (to Ground)  B1928  Short in Rear P/T Squib (LH) Circuit (to +B)  


DESCRIPTION

The rear pretensioner squib LH circuit consists of the airbag sensor with ECU assembly and rear 3 point type seat outer belt assembly LH.

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

These DTCs are stored when a malfunction is detected in the rear pretensioner squib LH circuit.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Test Mode / Check Mode
B1925 Short in Rear P/T Squib (LH) Circuit
·

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

·

Rear pretensioner squib LH malfunction

·

Airbag sensor with ECU assembly malfunction


·

Floor wire

·

Rear pretensioner squib LH (Rear 3 point type seat outer belt assembly LH)

·

Airbag sensor with ECU assembly


Comes on Applies to check mode
B1926 Open in Rear P/T Squib (LH) Circuit
·

The airbag sensor with ECU assembly detects an open in the rear pretensioner squib LH circuit.

·

Rear pretensioner squib LH malfunction

·

Airbag sensor with ECU assembly malfunction


·

Floor wire

·

Rear pretensioner squib LH (Rear 3 point type seat outer belt assembly LH)

·

Airbag sensor with ECU assembly


Comes on Applies to check mode
B1927 Short in Rear P/T Squib (LH) Circuit (to Ground)
·

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

·

Rear pretensioner squib LH malfunction

·

Airbag sensor with ECU assembly malfunction


·

Floor wire

·

Rear pretensioner squib LH (Rear 3 point type seat outer belt assembly LH)

·

Airbag sensor with ECU assembly


Comes on Applies to check mode
B1928 Short in Rear P/T Squib (LH) Circuit (to +B)
·

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

·

Rear pretensioner squib LH malfunction

·

Airbag sensor with ECU assembly malfunction


·

Floor wire

·

Rear pretensioner squib LH (Rear 3 point type seat outer belt assembly LH)

·

Airbag sensor with ECU assembly


Comes on Applies to check mode

WIRING DIAGRAM

B617299E07
1.719,1.313 2.198,1.573 0.479,0.26 10 false RL+ 2.073,1.292 2.552,1.552 0.479,0.26 10 false 1 2.083,1.885 2.563,2.146 0.479,0.26 10 false 2 0.854,2.406 1.333,2.667 0.479,0.26 10 false O5 0.854,2.573 3.49,3.063 2.635,0.49 10 false Rear Pretensioner Squib LH (Rear 3 Point Type Seat Outer Belt Assembly LH) 4.906,2.906 5.385,3.167 0.479,0.26 10 false O1 4.906,3.073 7.135,3.365 2.229,0.292 10 false Airbag Sensor with ECU Assembly 4.792,1.313 5.271,1.573 0.479,0.26 10 false 4 4.792,1.875 5.271,2.135 0.479,0.26 10 false 3 1.76,1.875 2.24,2.135 0.479,0.26 10 false RL- 4.948,1.333 5.427,1.594 0.479,0.26 10 false PLR+ 4.958,1.875 5.438,2.135 0.479,0.26 10 false PLR-

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 Rear 3 Point Type Seat Outer Belt 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 rear 3 point type seat outer belt 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 rear 3 point type seat outer belt 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 floor wire connector (on the rear 3 point type seat outer belt assembly LH side) is not loose, deformed or damaged.

OK:

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



g.

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 REAR 3 POINT TYPE SEAT OUTER BELT ASSEMBLY LH

NG

REPLACE FLOOR WIRE

2.CHECK REAR 3 POINT TYPE SEAT OUTER BELT ASSEMBLY LH
a.
C238359C52
0.396,2.25 0.74,2.5 0.344,0.25 0.667,0.667 0.667,1.063 false 1.802,2.313 1.979,2.313 false 0.604,1.052 1,1.396 0.396,0.344 10 false *1 2.26,0.844 2.573,1.177 0.313,0.333 10 false *2 1.813,0.521 2.146,0.979 0.333,0.458 10 false A 1.656,0.521 2.24,0.958 0.583,0.438 10 false B 1.156,0.521 1.708,0.99 0.552,0.469 10 false C 0.781,0.521 1.365,1.063 0.583,0.542 10 false D 0.479,2.292 1.01,2.667 0.531,0.375 10 false O5 2.01,2.229 2.448,2.573 0.438,0.344 10 false SST 0.344,1.719 0.646,2 0.302,0.281 10 false *a
*1 Rear 3 Point Type Seat Outer Belt Assembly LH
*2 Airbag Sensor with ECU Assembly
*a Front view of wire harness connector
(to Rear 3 Point Type Seat Outer Belt 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 rear 3 point type seat outer belt assembly LH for measurement, as this may lead to a serious injury due to pretensioner 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 B1925, B1926, B1927 or B1928 is not output.


HINT:

Codes other than DTCs B1925, B1926, B1927 and B1928 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 REAR 3 POINT TYPE SEAT OUTER BELT ASSEMBLY LH

Click hereVehicle Interior>SEAT BELT>REAR SEAT OUTER BELT ASSEMBLY>REMOVAL


NG

3.CHECK FLOOR WIRE
3.CHECK FLOOR WIRE
a.
C238360C40
0.604,2.375 0.958,2.625 0.354,0.25 0.573,0.667 0.573,1.063 false 1.375,0.667 1.375,1.063 false 1.531,2.333 1.844,2 true 1.021,2 1.323,2.333 true 0.51,1.063 1.01,1.375 0.5,0.313 10 false *1 2.406,0.844 2.781,1.281 0.375,0.438 10 false *2 1.948,0.521 2.25,0.875 0.302,0.354 10 false A 1.573,0.521 1.917,1.063 0.344,0.542 10 false B 1.063,0.521 1.5,0.917 0.438,0.396 10 false C 0.688,0.521 1.125,0.906 0.438,0.385 10 false D 1.313,1.063 1.646,1.417 0.333,0.354 10 false *3 1.885,1.917 2.302,2.26 0.417,0.344 10 false RL- 0.729,1.917 1.115,2.188 0.385,0.271 10 false RL+ 0.354,1.844 0.75,2.135 0.396,0.292 10 false *a 0.688,2.417 1.031,2.708 0.344,0.292 10 false O5
*1 Rear 3 Point Type Seat Outer Belt Assembly LH
*2 Airbag Sensor with ECU Assembly
*3 Floor Wire
*a Front view of wire harness connector
(to Rear 3 Point Type Seat Outer Belt 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
O5-1 (RL+) - Body ground Ignition switch ON Below 1 V
O5-2 (RL-) - 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
O5-1 (RL+) - O5-2 (RL-) 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
O5-1 (RL+) - Body ground Always 1 MΩ or higher
O5-2 (RL-) - 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
O5-1 (RL+) - O5-2 (RL-) 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.
C238353C17
0.802,0.833 0.802,1.24 false 0.927,0.688 1.344,1.146 0.417,0.458 10 D 1.083,0.688 1.438,1.177 0.354,0.49 10 C 1.583,0.677 1.906,1.042 0.323,0.365 10 B 1.74,0.688 2.104,1.01 0.365,0.323 10 A 2.167,1.01 2.552,1.375 0.385,0.365 10 *2 0.729,1.25 1.042,1.573 0.313,0.323 10 *1
*1 Rear 3 Point Type Seat Outer Belt Assembly LH
*2 Airbag Sensor with ECU Assembly


Connect the connectors to the rear 3 point type seat outer belt 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 B1925, B1926, B1927 or B1928 is not output.


HINT:

Codes other than DTCs B1925, B1926, B1927 and B1928 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