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)  B1860  Short in Knee Airbag (D Side) Squib Circuit  B1861  Open in Knee Airbag (D Side) Squib Circuit  B1862  Short in Knee Airbag (D Side) Squib Circuit (to Ground)  B1863  Short in Knee Airbag (D Side) Squib Circuit (to +B)  


DESCRIPTION

The driver side knee airbag squib circuit consists of the airbag sensor with ECU assembly and lower No. 1 instrument panel airbag assembly.

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 driver side knee airbag squib circuit.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Test Mode / Check Mode
B1860 Short in Knee Airbag (D Side) Squib Circuit
·

The airbag sensor with ECU assembly detects a line short in the driver side knee airbag squib during the primary check.

·

Driver side knee airbag squib malfunction

·

Airbag sensor with ECU assembly malfunction


·

Instrument panel wire

·

Driver side knee airbag squib (Lower No. 1 instrument panel airbag assembly)

·

Airbag sensor with ECU assembly


Comes on Applies to check mode
B1861 Open in Knee Airbag (D Side) Squib Circuit
·

The airbag sensor with ECU assembly detects an open in the driver side knee airbag squib.

·

Driver side knee airbag squib malfunction

·

Airbag sensor with ECU assembly malfunction


·

Instrument panel wire

·

Driver side knee airbag squib (Lower No. 1 instrument panel airbag assembly)

·

Airbag sensor with ECU assembly


Comes on Applies to check mode
B1862 Short in Knee Airbag (D Side) Squib Circuit (to Ground)
·

The airbag sensor with ECU assembly detects a short to ground in the driver side knee airbag squib.

·

Driver side knee airbag squib malfunction

·

Airbag sensor with ECU assembly malfunction


·

Instrument panel wire

·

Driver side knee airbag squib (Lower No. 1 instrument panel airbag assembly)

·

Airbag sensor with ECU assembly


Comes on Applies to check mode
B1863 Short in Knee Airbag (D Side) Squib Circuit (to +B)
·

The airbag sensor with ECU assembly detects a short to B+ in the driver side knee airbag squib.

·

Driver side knee airbag squib malfunction

·

Airbag sensor with ECU assembly malfunction


·

Instrument panel wire

·

Driver side knee airbag squib (Lower No. 1 instrument panel airbag assembly)

·

Airbag sensor with ECU assembly


Comes on Applies to check mode

WIRING DIAGRAM

B617299E03
1.708,1.313 2.188,1.573 0.479,0.26 10 false DK+ 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 I23 0.854,2.573 3.521,3 2.667,0.427 10 false Driver Side Knee Airbag Squib (Lower No. 1 Instrument Panel Airbag Assembly) 4.906,2.906 5.385,3.167 0.479,0.26 10 false I47 4.906,3.073 7.156,3.385 2.25,0.313 10 false Airbag Sensor with ECU Assembly 4.698,1.313 5.177,1.573 0.479,0.26 10 false 13 4.698,1.875 5.177,2.135 0.479,0.26 10 false 12 1.75,1.875 2.229,2.135 0.479,0.26 10 false DK- 4.958,1.323 5.438,1.583 0.479,0.26 10 false DK+ 4.958,1.885 5.438,2.146 0.479,0.26 10 false DK-

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.
C239229C01
0.552,1.115 0.552,1.542 false 1.313,0.979 1.313,0.604 1.313,0.604 1.146,0.604 false 0.469,1.573 0.958,1.958 0.49,0.385 10 *1 0.979,0.531 1.313,0.854 0.333,0.323 10 *3 2.313,0.969 2.625,1.344 0.313,0.375 10 *2 1.865,0.969 2.188,1.427 0.323,0.458 10 A 1.5,0.969 1.802,1.406 0.302,0.438 10 B 1.021,0.969 1.396,1.417 0.375,0.448 10 C 0.656,0.969 1.146,1.531 0.49,0.563 10 D
*1 Lower No. 1 Instrument Panel Airbag Assembly
*2 Airbag Sensor with ECU Assembly
*3 Instrument Panel 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 lower No. 1 instrument panel airbag assembly 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 lower No. 1 instrument panel airbag assembly 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 instrument panel wire connector (on the lower No. 1 instrument panel airbag assembly 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 instrument panel wire connector are not deformed or damaged.

OK:

The short springs are not deformed or damaged.



Result:
Proceed to
OK
NG



OK

2.CHECK LOWER NO. 1 INSTRUMENT PANEL AIRBAG ASSEMBLY

NG

REPLACE INSTRUMENT PANEL WIRE

2.CHECK LOWER NO. 1 INSTRUMENT PANEL AIRBAG ASSEMBLY
a.
C247056C19
0.448,2.24 0.833,2.479 0.385,0.24 0.667,0.906 0.667,1.302 false 1.844,2.26 2.021,2.26 false 0.594,1.313 0.938,1.656 0.344,0.344 10 false *1 2.25,0.75 2.573,1.115 0.323,0.365 10 false *2 1.813,0.76 2.083,1.094 0.271,0.333 10 false A 1.656,0.76 1.979,1.198 0.323,0.438 10 false B 1.146,0.76 1.385,1.156 0.24,0.396 10 false C 0.781,0.76 1.063,1.188 0.281,0.427 10 false D 0.552,2.271 0.917,2.573 0.365,0.302 10 false I23 2.063,2.177 2.542,2.552 0.479,0.375 10 false SST 0.313,1.698 0.625,2.146 0.313,0.448 10 false *a
*1 Lower No. 1 Instrument Panel Airbag Assembly
*2 Airbag Sensor with ECU Assembly
*a Front view of wire harness connector
(to Lower No. 1 Instrument Panel Airbag Assembly)


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 lower No. 1 instrument panel airbag assembly 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 B1860, B1861, B1862 or B1863 is not output.


HINT:

Codes other than DTCs B1860, B1861, B1862 and B1863 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 LOWER NO. 1 INSTRUMENT PANEL AIRBAG ASSEMBLY

Click hereVehicle Interior>SUPPLEMENTAL RESTRAINT SYSTEMS>KNEE AIRBAG ASSEMBLY>REMOVAL


NG

3.CHECK INSTRUMENT PANEL WIRE
3.CHECK INSTRUMENT PANEL WIRE
a.
C245639C22
0.51,2.219 0.875,2.458 0.365,0.24 1.469,2.323 1.073,2.563 true 1.698,2.323 2.042,2.563 true 0.51,0.875 0.51,0.458 0.51,0.458 0.375,0.458 false 1.354,0.875 1.354,0.458 1.354,0.458 1.219,0.458 false 0.635,0.865 1.135,1.208 0.5,0.344 10 false D 1.031,0.865 1.354,1.177 0.323,0.313 10 false C 1.594,0.875 1.927,1.167 0.333,0.292 10 false B 1.99,0.875 2.563,1.271 0.573,0.396 10 false A 2.406,0.875 2.74,1.135 0.333,0.26 10 false *2 0.938,2.573 1.396,2.875 0.458,0.302 10 false DK+ 0.604,2.26 1.01,2.573 0.406,0.313 10 false I23 2,2.573 2.635,2.885 0.635,0.313 10 false DK- 0.302,1.875 0.604,2.177 0.302,0.302 10 false *a 0.219,0.385 0.688,0.698 0.469,0.313 10 false *1 1.073,0.385 1.552,0.708 0.479,0.323 10 false *3
*1 Lower No. 1 Instrument Panel Airbag Assembly
*2 Airbag Sensor with ECU Assembly
*3 Instrument Panel Wire
*a Front view of wire harness connector
(to Lower No. 1 Instrument Panel Airbag Assembly)


Disconnect the instrument panel 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
I23-1 (DK+) - Body ground Ignition switch ON Below 1 V
I23-2 (DK-) - 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
I23-1 (DK+) - I23-2 (DK-) 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
I23-1 (DK+) - Body ground Always 1 MΩ or higher
I23-2 (DK-) - 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
I23-1 (DK+) - I23-2 (DK-) 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 INSTRUMENT PANEL WIRE

4.CHECK DTC
a.
C238245C01
0.844,1.146 0.844,1.458 false 0.969,1 1.219,1.385 0.25,0.385 10 false D 1.125,1 1.333,1.417 0.208,0.417 10 false C 1.583,1 1.823,1.354 0.24,0.354 10 false B 1.74,1 2,1.323 0.26,0.323 10 false A 2.167,0.99 2.458,1.313 0.292,0.323 10 false *2 0.76,1.479 1.083,1.781 0.323,0.302 10 false *1
*1 Lower No. 1 Instrument Panel Airbag Assembly
*2 Airbag Sensor with ECU Assembly


Connect the connectors to the lower No. 1 instrument panel airbag assembly 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 B1860, B1861, B1862 or B1863 is not output.


HINT:

Codes other than DTCs B1860, B1861, B1862 and B1863 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