RM38N0EC _58 Vehicle Interior _111838 SUPPLEMENTAL RESTRAINT SYSTEMS _0499714 AIRBAG SYSTEM C

SUPPLEMENTAL RESTRAINT SYSTEMS  AIRBAG SYSTEM  B00021A  Driver Frontal Stage 2 Deployment Control Circuit Resistance Below Threshold  


DESCRIPTION

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate DTC Output from Priority Test Mode / Check Mode
B00021A Driver Frontal Stage 2 Deployment Control Circuit Resistance Below Threshold
·

The airbag sensor assembly detects a line short in the driver squib 2nd step circuit for 2 seconds during the primary check.

·

Horn button assembly malfunction

·

Spiral cable sub-assembly malfunction

·

Airbag sensor assembly malfunction


·

Harness or connector

·

Spiral cable sub-assembly

·

Horn button assembly

·

Airbag sensor assembly


Comes on SRS Airbag A Applies to check mode

WIRING DIAGRAM

B475053E79
4.948,1.344 5.333,1.625 0.385,0.281 10 false D2+ 4.948,1.896 5.333,2.177 0.385,0.281 10 false D2- 4.771,1.344 5.156,1.625 0.385,0.281 10 false 9 4.771,1.896 5.156,2.177 0.385,0.281 10 false 8 4.917,2.917 5.427,3.219 0.51,0.302 10 false E64 4.927,3.094 6.604,3.438 1.677,0.344 10 false Airbag Sensor Assembly 3.219,1.438 3.729,1.74 0.51,0.302 10 false E21 3.219,2 3.729,2.302 0.51,0.302 10 false E21 3.302,1.229 3.813,1.531 0.51,0.302 10 false 4 3.302,1.781 3.813,2.083 0.51,0.302 10 false 3 2.396,2.406 3.365,2.854 0.969,0.448 10 false Spiral Cable Sub-assembly 2.854,1.344 3.24,1.625 0.385,0.281 10 false D2+ 2.135,1.438 2.646,1.74 0.51,0.302 10 false z8 2.135,1.99 2.646,2.292 0.51,0.302 10 false z8 0.865,2.417 2,2.969 1.135,0.552 10 false Driver Squib 2nd Step (Horn Button Assembly) 2.177,1.229 2.688,1.531 0.51,0.302 10 false 1 2.177,1.781 2.688,2.083 0.51,0.302 10 false 2 2.885,1.906 3.271,2.188 0.385,0.281 10 false D2-

CAUTION / NOTICE / HINT

NOTICE:
·

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

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

·

When disconnecting and reconnecting the auxiliary battery.

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

HINT:

When disconnecting and reconnecting the auxiliary 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 work procedure.

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

·

When installing the spiral cable sub-assembly and steering wheel, be sure to adjust the spiral cable sub-assembly as it may break if the steering wheel is turned before adjusting the spiral cable sub-assembly.

Click hereVehicle Interior>SUPPLEMENTAL RESTRAINT SYSTEMS>SPIRAL CABLE>INSTALLATION



HINT:
·

To perform the simulation method, enter check mode (signal check) with the GTS.

Click hereVehicle Interior>SUPPLEMENTAL RESTRAINT SYSTEMS>AIRBAG SYSTEM>CHECK MODE PROCEDURE

·

Perform the simulation method while checking the Data List.

Click hereVehicle Interior>SUPPLEMENTAL RESTRAINT SYSTEMS>AIRBAG SYSTEM>DATA LIST / ACTIVE TEST



PROCEDURE

1.CLEAR DTC

Pre-procedure1

a.

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


Procedure1

b.

Clear the DTCs stored in memory.

Body Electrical > SRS Airbag > Clear DTCs
50002 444
Result:
Proceed to
NEXT



Post-procedure1

c.

Turn the ignition switch off.



NEXT

2.CHECK DTC
2.CHECK DTC

Pre-procedure1

a.

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


Procedure1

b.

Check for DTCs.

Body Electrical > SRS Airbag > Trouble Codes
50001 444
Result:
Result Proceed to
B00021A is output A
B00021A is not output B



Post-procedure1

c.

None



A

3.CHECK CONNECTION OF CONNECTORS

B

USE SIMULATION METHOD TO CHECK

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


3.CHECK CONNECTION OF CONNECTORS

Pre-procedure1

a.

Turn the ignition switch off.


b.

Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 60 seconds.


Procedure1

c.

Check that the connectors are properly connected to the horn button assembly, spiral cable sub-assembly and airbag sensor assembly.

OK:

The connectors are properly connected.


Result:
Proceed to
OK
NG



Post-procedure1

d.

None



OK

4.CHECK CONNECTORS

NG

CONNECT CONNECTORS PROPERLY

4.CHECK CONNECTORS

Pre-procedure1

a.
C371112C07
0.198,1.24 0.51,1.438 0.313,0.198 10 false *1 1.073,1.375 1.385,1.573 0.313,0.198 10 false *3 2.792,1.594 3.104,1.792 0.313,0.198 10 false *2 1.979,1.219 2.292,1.417 0.313,0.198 10 false *4
*1 Horn Button Assembly
*2 Airbag Sensor Assembly
*3 Spiral Cable Sub-assembly
*4 Wire Harness


Disconnect the airbag sensor assembly connector.


b.

Disconnect the spiral cable sub-assembly connector.


c.

Disconnect the horn button assembly connector.


Procedure1

d.

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

OK:

The terminals are not deformed or damaged.



e.

Check that the connectors are not loose, deformed or damaged.

OK:

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



f.

Check that the short springs of the activation prevention mechanisms of the wire harness connector and spiral cable sub-assembly connector are not deformed or damaged.

OK:

The short springs are not deformed or damaged.


Result:
Proceed to
OK
NG



Post-procedure1

g.

None



OK

5.CLEAR DTC

NG

REPAIR OR REPLACE WIRE HARNESS OR SPIRAL CABLE SUB-ASSEMBLY

5.CLEAR DTC

Pre-procedure1

a.
C361088C40
0.344,2.229 0.76,2.479 0.417,0.25 1.729,2.229 1.927,2.073 1.927,2.073 2.01,2.073 true 1.313,2.365 1.646,2.906 1.646,2.906 1.917,2.906 true 2.344,0.615 2.583,0.927 0.24,0.313 10 false A 2.188,0.615 2.427,0.927 0.24,0.313 10 false B 1.76,0.615 2,0.927 0.24,0.313 10 false C 1.604,0.615 1.844,0.927 0.24,0.313 10 false D 0.75,0.615 0.99,0.927 0.24,0.313 10 false E 0.448,0.615 0.688,0.927 0.24,0.313 10 false F 0.333,1.688 0.781,2 0.448,0.313 10 false *a 0.49,2.281 0.938,2.594 0.448,0.313 10 false z8 0.344,0.875 0.573,1.073 0.229,0.198 10 false *1 2.698,1.271 3.146,1.583 0.448,0.313 10 false *2 1.146,0.99 1.604,1.313 0.458,0.323 10 false *3 2.052,2 2.479,2.396 0.427,0.396 10 false *5 1.938,0.823 2.365,1.219 0.427,0.396 10 false *4 1.948,2.823 2.396,3.135 0.448,0.313 10 false *b
*1 Horn Button Assembly
*2 Airbag Sensor Assembly
*3 Spiral Cable Sub-assembly
*4 Wire Harness
*5 SST
*a Front view of wire harness connector
(to Horn Button Assembly)
*b Color: Black


Connect the airbag sensor assembly connector.


b.

Connect the spiral cable sub-assembly connector.


c.

Connect SST (resistance: 2.1 Ω) to connector E (black connector).

CAUTION:

Never connect the tester to the horn button 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  

d.

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


e.

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


Procedure1

f.

Clear the DTCs stored in memory.

Body Electrical > SRS Airbag > Clear DTCs
50002 444
Result:
Proceed to
NEXT



Post-procedure1

g.

Turn the ignition switch off.



NEXT

6.CHECK HORN BUTTON ASSEMBLY
6.CHECK HORN BUTTON ASSEMBLY

Pre-procedure1

a.

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


Procedure1

b.

Check for DTCs.

Body Electrical > SRS Airbag > Trouble Codes
50001 444
Result:
Result Proceed to
B00021A is not output A
B00021A is output B


HINT:

Codes other than DTC B00021A may be output at this time, but they are not related to this check.



Post-procedure1

c.

Turn the ignition switch off.


d.

Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 60 seconds.


e.

Disconnect SST from connector E.



A

REPLACE HORN BUTTON ASSEMBLY

Click hereVehicle Interior>SUPPLEMENTAL RESTRAINT SYSTEMS>STEERING PAD>REMOVAL


B

7.CHECK DRIVER SIDE 2ND SQUIB CIRCUIT
7.CHECK DRIVER SIDE 2ND SQUIB CIRCUIT

Pre-procedure1

a.
B585410C03
0.521,2.333 0.844,2.583 0.323,0.25 1.406,2.385 1.771,2.781 1.771,2.781 1.969,2.781 true 2.385,0.719 2.625,1.031 0.24,0.313 10 false A 2.063,0.719 2.302,1.031 0.24,0.313 10 false B 1.708,0.719 1.948,1.031 0.24,0.313 10 false C 1.552,0.719 1.792,1.031 0.24,0.313 10 false D 0.698,0.719 0.938,1.031 0.24,0.313 10 false E 0.385,0.719 0.625,1.031 0.24,0.313 10 false F 0.365,1.708 0.813,2.021 0.448,0.313 10 false *a 0.625,2.375 1.073,2.688 0.448,0.313 10 false z8 0.281,0.979 0.51,1.177 0.229,0.198 10 false *1 2.719,1.354 3.167,1.667 0.448,0.313 10 false *2 1.073,1.083 1.521,1.396 0.448,0.313 10 false *3 1.854,0.51 2.302,0.823 0.448,0.313 10 false *4 2,2.698 2.448,3.01 0.448,0.313 10 false *b
*1 Horn Button Assembly
*2 Airbag Sensor Assembly
*3 Spiral Cable Sub-assembly
*4 Wire Harness
*a Front view of wire harness connector
(to Horn Button Assembly)
*b Color: Black
V100135

Release the activation prevention mechanism


Disconnect the airbag sensor assembly connector.


b.

Release the activation prevention mechanism built into connector B.

HINT:

Click hereVehicle Interior>SUPPLEMENTAL RESTRAINT SYSTEMS>AIRBAG SYSTEM>SYSTEM DESCRIPTION



Procedure1

c.

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

Standard Resistance:
Tester Connection Condition Specified Condition

Click Location & Routing(z8)Location & Routing

Click Connector(z8)Instrument Panel>Other>Spiral Cable Sub-Assembly, Horn Button Assembly

z8-1 - z8-2 Always 1 MΩ or higher


Result:
Proceed to
OK
NG



Post-procedure1

d.

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



OK

8.CLEAR DTC

NG

10.CHECK HARNESS AND CONNECTOR
8.CLEAR DTC

Pre-procedure1

a.
C371113C10
0.365,1.208 0.677,1.406 0.313,0.198 10 false *1 2.635,1.563 2.948,1.76 0.313,0.198 10 false *2 1.125,1.333 1.438,1.531 0.313,0.198 10 false *3 1.927,1.177 2.24,1.375 0.313,0.198 10 false *4
*1 Horn Button Assembly
*2 Airbag Sensor Assembly
*3 Spiral Cable Sub-assembly
*4 Wire Harness


Connect the airbag sensor assembly connector.


b.

Connect the horn button assembly connector.


c.

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


d.

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


Procedure1

e.

Clear the DTCs stored in memory.

Body Electrical > SRS Airbag > Clear DTCs
50002 444
Result:
Proceed to
NEXT



Post-procedure1

f.

Turn the ignition switch off.



NEXT

9.CHECK DTC
9.CHECK DTC

Pre-procedure1

a.

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


Procedure1

b.

Check for DTCs.

Body Electrical > SRS Airbag > Trouble Codes
50001 444
Result:
Result Proceed to
B00021A is not output A
B00021A is output B


HINT:

Codes other than DTC B00021A may be output at this time, but they are not related to this check.



Post-procedure1

c.

None



A

USE SIMULATION METHOD TO CHECK

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


B

REPLACE AIRBAG SENSOR ASSEMBLY

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


10.CHECK HARNESS AND CONNECTOR

Pre-procedure1

a.
B585411C03
0.344,2.323 0.781,2.583 0.438,0.26 1.188,2.969 1.354,2.969 1.354,2.969 1.521,2.573 true 2.01,2.958 1.875,2.958 1.875,2.958 1.698,2.573 true 0.24,0.75 0.552,0.948 0.313,0.198 10 false *1 2,0.74 2.313,0.938 0.313,0.198 10 false *4 2.844,1.115 3.156,1.313 0.313,0.198 10 false *2 1.073,0.885 1.385,1.083 0.313,0.198 10 false *3 0.375,1.635 0.688,1.833 0.313,0.198 10 false *a 2.052,2.875 2.406,3.063 0.354,0.188 10 false D2+ 0.938,2.885 1.271,3.083 0.333,0.198 10 false D2- 0.448,2.365 1.052,2.615 0.604,0.25 10 false E21 2.521,0.521 2.833,0.719 0.313,0.198 10 false A 2.24,0.531 2.552,0.729 0.313,0.198 10 false B 1.792,0.531 2.104,0.729 0.313,0.198 10 false C 1.521,0.531 1.833,0.729 0.313,0.198 10 false D 0.688,0.531 1,0.729 0.313,0.198 10 false E 0.448,0.531 0.76,0.729 0.313,0.198 10 false F
*1 Horn Button Assembly
*2 Airbag Sensor Assembly
*3 Spiral Cable Sub-assembly
*4 Wire Harness
*a Front view of wire harness connector
(to Spiral Cable Sub-assembly)
V100135

Release the activation prevention mechanism


Disconnect the spiral cable sub-assembly connector.


b.

Release the activation prevention mechanism built into connector B.

HINT:

Click hereVehicle Interior>SUPPLEMENTAL RESTRAINT SYSTEMS>AIRBAG SYSTEM>SYSTEM DESCRIPTION



Procedure1

c.

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

Standard Resistance:
Tester Connection Condition Specified Condition

Click Location & Routing(E21)Location & Routing

Click Connector(E21)Instrument Panel>Instrument Panel Wire / Telephone Computer Wire>Spiral Cable Sub-Assembly

E21-3 (D2-) - E21-4 (D2+) Always 1 MΩ or higher


Result:
Proceed to
OK
NG



Post-procedure1

d.

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



OK

REPLACE SPIRAL CABLE SUB-ASSEMBLY

Click hereVehicle Interior>SUPPLEMENTAL RESTRAINT SYSTEMS>SPIRAL CABLE>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR