RM35X0E _58 Vehicle Interior _079257 SUPPLEMENTAL RESTRAINT SYSTEMS _0396679 AIRBAG SYSTEM(for Type C) C

SUPPLEMENTAL RESTRAINT SYSTEMS  AIRBAG SYSTEM(for Type C)  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 squib circuit consists of the airbag sensor assembly and lower No. 1 instrument panel airbag assembly.

This circuit instructs the SRS to deploy when deployment conditions are met.

These DTCs are stored when a malfunction is detected in the driver side knee 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 One of the following conditions is met:
·

The airbag sensor assembly detects a line short circuit signal 5 times in the driver side knee squib circuit during the primary check.

·

A lower No. 1 instrument panel airbag assembly malfunction.

·

An airbag sensor assembly malfunction.


·

Instrument panel wire

·

Lower No. 1 instrument panel airbag assembly

·

Airbag sensor assembly


Comes on Applicable
B1861 Open in Knee Airbag (D Side) Squib Circuit One of the following conditions is met:
·

The airbag sensor assembly detects an open circuit signal in the driver side knee squib circuit for 2 seconds.

·

A lower No. 1 instrument panel airbag assembly malfunction.

·

An airbag sensor assembly malfunction.


·

Instrument panel wire

·

Lower No. 1 instrument panel airbag assembly

·

Airbag sensor assembly


Comes on Applicable
B1862 Short in Knee Airbag (D Side) Squib Circuit (to Ground) One of the following conditions is met:
·

The airbag sensor assembly detects a short circuit to ground signal in the driver side knee squib circuit for 0.5 seconds.

·

A lower No. 1 instrument panel airbag assembly malfunction.

·

An airbag sensor assembly malfunction.


·

Instrument panel wire

·

Lower No. 1 instrument panel airbag assembly

·

Airbag sensor assembly


Comes on Applicable
B1863 Short in Knee Airbag (D Side) Squib Circuit (to +B) One of the following conditions is met:
·

The airbag sensor assembly detects a short circuit to B+ signal in the driver side knee squib circuit for 0.5 seconds.

·

A lower No. 1 instrument panel airbag assembly malfunction.

·

An airbag sensor assembly malfunction.


·

Instrument panel wire

·

Lower No. 1 instrument panel airbag assembly

·

Airbag sensor assembly


Comes on Applicable

WIRING DIAGRAM

C409207
0.49,1.698 0.948,1.896 0.458,0.198 10 false N16 0.49,1.875 2.375,2.25 1.885,0.375 10 false Lower No. 1 Instrument Panel Airbag Assembly 1.302,1.115 1.615,1.313 0.313,0.198 10 false DK- 1.323,0.333 1.646,0.531 0.323,0.198 10 false DK+ 1.698,0.313 1.844,0.49 0.146,0.177 10 false 1 1.688,1.115 1.833,1.292 0.146,0.177 10 false 2 5.302,0.344 5.51,0.521 0.208,0.177 10 false 13 5.302,1.115 5.49,1.292 0.188,0.177 10 false 12 5.594,0.448 5.958,0.646 0.365,0.198 10 false DK+ 5.594,1.229 5.958,1.427 0.365,0.198 10 false DK- 5.417,1.708 5.875,1.906 0.458,0.198 10 false N45 5.417,1.865 7.104,2.125 1.688,0.26 10 false Airbag Sensor Assembly

CAUTION / NOTICE / HINT

NOTICE:
·

After the engine 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

·

When disconnecting and reconnecting the battery

Click hereGeneral>SETUP>WHEN DISCONNECTING OR RECONNECTING BATTERY TERMINAL>WORK PROCEDURE

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


·

After replacing the airbag sensor assembly, refer to initialization.

Click hereGeneral>SETUP>WHEN REPLACING OR REMOVING/INSTALLING PARTS>WORK PROCEDURE



HINT:

To perform the simulation method, enter check mode (signal check) with the GTS (Click here Vehicle Interior>SUPPLEMENTAL RESTRAINT SYSTEMS>AIRBAG SYSTEM (for Type C)>CHECK MODE PROCEDURE), and then wiggle each connector of the airbag system or drive the vehicle on various types of road (Click here General>INTRODUCTION>HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS>HOW TO PROCEED WITH TROUBLESHOOTING).


PROCEDURE

1.CHECK CONNECTORS
a.
C208251C26
0.688,0.781 1,0.938 0.313,0.156 10 false *1 2.146,1.646 2.458,1.875 0.313,0.229 10 false *2 1.229,0.781 1.542,0.938 0.313,0.156 10 false *3
*1 Lower No. 1 Instrument Panel Airbag Assembly
*2 Airbag Sensor Assembly
*3 Instrument Panel Wire


Turn the engine switch off.


b.

Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.


c.

Check that the connectors are properly connected to the lower No. 1 instrument panel airbag assembly and airbag sensor 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 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 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.
C411570C05
0.583,2.135 1.094,2.396 0.51,0.26 2.438,2.469 2.26,2.469 2.26,2.469 2.083,2.292 true 0.958,0.865 1.271,1.021 0.313,0.156 10 false *1 2.49,1.188 2.802,1.344 0.313,0.156 10 false *2 2.49,2.354 2.802,2.51 0.313,0.156 10 false *3 0.646,1.51 0.958,1.667 0.313,0.156 10 false *a 0.667,2.177 1.042,2.333 0.375,0.156 10 false N16 2.01,0.625 2.323,0.781 0.313,0.156 10 false A 1.844,0.635 2.156,0.792 0.313,0.156 10 false B 1.427,0.625 1.74,0.781 0.313,0.156 10 false C 1.125,0.635 1.438,0.792 0.313,0.156 10 false D
*1 Lower No. 1 Instrument Panel Airbag Assembly
*2 Airbag Sensor Assembly
*3 SST
*a Front view of wire harness connector
(to Lower No. 1 Instrument Panel Airbag Assembly)


Connect the connector to the airbag sensor assembly.


b.

Connect the white wire side of SST (resistance: 2.1 Ω) to connector C.

CAUTION:

Never connect the 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 SST.

·

Insert SST straight into the terminals of the connector.




SST
09843-18061  

c.

Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.


d.

Turn the engine switch on (IG), and wait for at least 60 seconds.


e.

Clear the DTCs stored in memory.

Click hereVehicle Interior>SUPPLEMENTAL RESTRAINT SYSTEMS>AIRBAG SYSTEM (for Type C)>DTC CHECK / CLEAR

Body Electrical > SRS Airbag > Clear DTCs
50002 188

f.

Turn the engine switch off.


g.

Turn the engine switch on (IG), and wait for at least 60 seconds.


h.

Check for DTCs.

Click hereVehicle Interior>SUPPLEMENTAL RESTRAINT SYSTEMS>AIRBAG SYSTEM (for Type C)>DTC CHECK / CLEAR

Body Electrical > SRS Airbag > Trouble Codes
50001 188
Result:
Proceed to
DTCs B1860, B1861, B1862 and B1863 are not output
DTC B1860, B1861, B1862 or B1863 is output


HINT:

Codes other than DTC B1860, B1861, B1862 and B1863 may be output at this time, but they are not related to this check.



i.

Turn the engine switch off.


j.

Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.


k.

Disconnect SST from connector C.



DTCs B1860, B1861, B1862 and B1863 are not output

REPLACE LOWER NO. 1 INSTRUMENT PANEL AIRBAG ASSEMBLY

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


DTC B1860, B1861, B1862 or B1863 is output

3.CHECK INSTRUMENT PANEL WIRE
3.CHECK INSTRUMENT PANEL WIRE
a.
C411573C03
0.646,2 1.052,2.26 0.406,0.26 1.094,2.51 1.229,2.51 1.229,2.51 1.583,2.052 true 2.302,2.438 2.146,2.438 2.146,2.438 1.76,2.052 true 0.823,0.438 1.135,0.594 0.313,0.156 10 false *1 2.375,1.208 2.688,1.365 0.313,0.156 10 false *2 1.5,0.448 1.813,0.604 0.313,0.156 10 false *3 0.573,1.531 0.885,1.688 0.313,0.156 10 false *a 1,0.646 1.167,0.844 0.167,0.198 10 false D 1.302,0.635 1.448,0.823 0.146,0.188 10 false C 1.729,0.646 1.875,0.833 0.146,0.188 10 false B 2.01,0.635 2.156,0.823 0.146,0.188 10 false A 0.771,2.448 1.427,2.667 0.656,0.219 10 false DK+ 2.375,2.354 2.948,2.563 0.573,0.208 10 false DK- 0.719,2.052 1.135,2.229 0.417,0.177 10 false N16
*1 Lower No. 1 Instrument Panel Airbag Assembly
*2 Airbag Sensor Assembly
*3 Instrument Panel Wire
*a Front view of wire harness connector
(to Lower No. 1 Instrument Panel Airbag Assembly)
V100135

Release the activation prevention mechanism


Disconnect the instrument panel wire from the airbag sensor assembly.


b.

Check for a short to B+ in the circuit.

i.

Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.


ii.

Turn the engine switch on (IG).


iii.

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

Standard Voltage:
Tester Connection Switch Condition Specified Condition
N16-1 (DK+) - Body ground Engine switch on (IG) Below 1 V
N16-2 (DK-) - Body ground Engine switch on (IG) Below 1 V



iv.

Turn the engine switch off.


v.

Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.



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
N16-1 (DK+) - N16-2 (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
N16-1 (DK+) - Body ground Always 1 MΩ or higher
N16-2 (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 Type C)>SYSTEM DESCRIPTION


ii.

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

Standard Resistance:
Tester Connection Condition Specified Condition
N16-1 (DK+) - N16-2 (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.
C238245C31
2.146,1.604 2.438,1.844 0.292,0.24 10 false *2 0.688,0.833 0.938,1 0.25,0.167 10 false *1
*1 Lower No. 1 Instrument Panel Airbag Assembly
*2 Airbag Sensor Assembly


Connect the connectors to the lower No. 1 instrument panel airbag assembly and airbag sensor assembly.


b.

Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.


c.

Turn the engine switch on (IG), and wait for at least 60 seconds.


d.

Clear the DTCs stored in memory.

Click hereVehicle Interior>SUPPLEMENTAL RESTRAINT SYSTEMS>AIRBAG SYSTEM (for Type C)>DTC CHECK / CLEAR

Body Electrical > SRS Airbag > Clear DTCs
50002 188

e.

Turn the engine switch off.


f.

Turn the engine switch on (IG), and wait for at least 60 seconds.


g.

Check for DTCs.

Click hereVehicle Interior>SUPPLEMENTAL RESTRAINT SYSTEMS>AIRBAG SYSTEM (for Type C)>DTC CHECK / CLEAR

Body Electrical > SRS Airbag > Trouble Codes
50001 188
Result:
Proceed to
DTCs B1860, B1861, B1862 and B1863 are not output
DTC B1860, B1861, B1862 or B1863 is output


HINT:

Codes other than DTC B1860, B1861, B1862 and B1863 may be output at this time, but they are not related to this check.




DTCs B1860, B1861, B1862 and B1863 are not output

USE SIMULATION METHOD TO CHECK

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


DTC B1860, B1861, B1862 or B1863 is output

REPLACE AIRBAG SENSOR ASSEMBLY

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