RM3090E _58 Vehicle Interior _008786 SUPPLEMENTAL RESTRAINT SYSTEMS _0066372 AIRBAG SYSTEM(w/ Occupant Classification System) J

SUPPLEMENTAL RESTRAINT SYSTEMS  AIRBAG SYSTEM(w/ Occupant Classification System)  SRS Warning Light Remains ON  


DESCRIPTION

The SRS warning light is located in the combination meter assembly.

When the SRS is normal, the SRS warning light comes on for approximately 6 seconds after the ignition switch is turned from off to ON, and then goes off automatically.

If there is a malfunction in the SRS, the SRS warning light comes on to inform the driver of a problem.

When terminals TC and CG of the DLC3 are connected, DTCs are output by the blinking of the SRS warning light.

The SRS is equipped with a voltage-increase circuit (DC-DC converter) in the airbag sensor assembly in case the source voltage drops.

When the battery voltage drops, the voltage-increase circuit (DC-DC converter) functions to increase the voltage of the SRS to normal voltage.

A malfunction in this circuit is not recorded in the airbag sensor assembly. The SRS warning light automatically goes off when the source voltage returns to normal.

The signal to illuminate the SRS warning light is transmitted from the airbag sensor assembly to the combination meter assembly through the CAN communication system.

WIRING DIAGRAM

C279126E02
0.073,0.865 1.063,1.083 0.99,0.219 10 false from IG2 Relay 1.781,1.021 2.177,1.24 0.396,0.219 10 false A/B 2.906,2.583 3.156,2.771 0.25,0.188 10 false 39 4.094,1.948 4.365,2.135 0.271,0.188 10 false 31 3.677,2.073 4.146,2.292 0.469,0.219 10 false CANL 0.208,3.271 1.073,3.49 0.865,0.219 10 false from Battery 1.688,2.823 2.313,3.052 0.625,0.229 10 false METER 1.521,3.438 2.385,3.656 0.865,0.219 10 false ECU-B NO.2 2.906,3.156 3.125,3.354 0.219,0.198 10 false 40 2.906,4.167 3.146,4.385 0.24,0.219 10 false 21 3.125,4.26 3.417,4.438 0.292,0.177 10 false ET 2.969,5.74 3.313,5.958 0.344,0.219 10 false G16 2.948,5.917 4.906,6.146 1.958,0.229 10 false Combination Meter Assembly 5.99,5.667 6.333,5.885 0.344,0.219 10 false G92 6,5.833 6.896,6.208 0.896,0.375 10 false Airbag Sensor Assembly 4.094,2.542 4.365,2.74 0.271,0.198 10 false 32 3.646,2.688 4.115,2.906 0.469,0.219 10 false CANH 5.906,3.563 6.146,3.792 0.24,0.229 10 false 25 5.906,4.177 6.167,4.385 0.26,0.208 10 false 26 6.125,3.677 6.365,3.896 0.24,0.219 10 false E1 6.135,4.281 6.427,4.49 0.292,0.208 10 false E2 5.896,1.958 6.135,2.188 0.24,0.229 10 false 22 5.885,2.521 6.115,2.74 0.229,0.219 10 false 13 6.115,0.854 6.479,1.083 0.365,0.229 10 false IG2 5.885,0.75 6.146,0.958 0.26,0.208 10 false 21 6.125,2.073 6.594,2.292 0.469,0.219 10 false CANL 6.115,2.677 6.583,2.896 0.469,0.219 10 false CANH 0.458,6.365 2.344,6.583 1.885,0.219 10 false : CAN Communication Line 3.146,3.292 3.438,3.469 0.292,0.177 10 false B 3.156,2.677 3.448,2.854 0.292,0.177 10 false IG+

CAUTION / NOTICE / HINT

NOTICE:
·

After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

Click hereGeneral>INTRODUCTION>REPAIR INSTRUCTION>PRECAUTION

·

When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected.

Click hereGeneral>INTRODUCTION>REPAIR INSTRUCTION>INITIALIZATION

·

After replacing the airbag sensor assembly, refer to initialization.

Click hereGeneral>INTRODUCTION>REPAIR INSTRUCTION>INITIALIZATION

·

Inspect the fuses for circuits related to this system before performing the following inspection procedure.



PROCEDURE

1.CHECK CAN COMMUNICATION SYSTEM
a.

Check if a CAN communication DTC is output.

Click herePower Source / Network>NETWORKING>CAN COMMUNICATION SYSTEM(for LHD)>HOW TO PROCEED WITH TROUBLESHOOTING

Result:
Proceed to
DTCs are output
DTC is not output




DTCs are output

GO TO CAN COMMUNICATION SYSTEM

Click herePower Source / Network>NETWORKING>CAN COMMUNICATION SYSTEM(for LHD)>HOW TO PROCEED WITH TROUBLESHOOTING


DTC is not output

2.CHECK BATTERY
2.CHECK BATTERY
a.

Measure the voltage of the battery.

Standard voltage:

11 to 14 V



Result:
Proceed to
OK
NG



OK

3.CHECK CONNECTION OF CONNECTORS

NG

REPLACE OR RECHARGE BATTERY

3.CHECK CONNECTION OF CONNECTORS
a.

Turn the ignition 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 airbag sensor assembly and combination meter assembly.


Result:
Proceed to
The connectors are properly connected
The connectors are not properly connected



The connectors are properly connected

4.CHECK HARNESS AND CONNECTOR (AIRBAG SENSOR ASSEMBLY - BATTERY AND BODY GROUND)

The connectors are not properly connected

CONNECT CONNECTORS PROPERLY

4.CHECK HARNESS AND CONNECTOR (AIRBAG SENSOR ASSEMBLY - BATTERY AND BODY GROUND)
a.
C198548C04
0.385,0.698 0.823,0.99 0.438,0.292 1.635,1.365 1.302,1.896 false 1.74,1.385 2.198,1.896 false 2.219,1.385 2.615,1.385 false 0.448,0.76 0.76,0.917 0.313,0.156 10 false G92 1.188,1.906 1.438,2.094 0.25,0.188 10 false E2 2.094,1.917 2.323,2.083 0.229,0.167 10 false E1 2.646,1.302 2.938,1.469 0.292,0.167 10 false IG2 0.063,0.063 0.281,0.229 0.219,0.167 10 false *a
*a Rear view of wire harness connector
(to Airbag Sensor Assembly)


Disconnect the connectors from the airbag sensor assembly.


b.

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


c.

Turn the ignition switch to ON.


d.

Operate all the components of the electrical system (defogger, wipers, headlights, heater blower, etc.).


e.

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

Standard Voltage:
Tester Connection Switch Condition Specified Condition
G92-21 (IG2) - Body ground Ignition switch ON 11 to 14 V
G92-21 (IG2) - Body ground Ignition switch off Below 1 V



f.

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

Standard Resistance:
Tester Connection Condition Specified Condition
G92-25 (E1) - Body ground Always Below 1 Ω
G92-26 (E2) - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

5.CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - BATTERY AND BODY GROUND)

NG

REPLACE HARNESS AND CONNECTOR

5.CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - BATTERY AND BODY GROUND)
a.
C253599C03
1.49,0.427 1.875,0.688 0.385,0.26 2.792,1.542 2.917,1.823 true 2.635,1.542 2.51,1.854 true 0.583,1.563 0.323,1.823 true 0.115,0.083 0.427,0.24 0.313,0.156 10 *a 1.531,0.469 1.844,0.625 0.313,0.156 10 G16 0.208,1.854 0.438,2.052 0.229,0.198 10 ET 2.406,1.885 2.719,2.042 0.313,0.156 10 IG+ 2.917,1.885 3.146,2.052 0.229,0.167 10 B
*a Front view of wire harness connector
(to Combination Meter Assembly)


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


b.

Disconnect the G16 connector from the combination meter assembly.


c.

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


d.

Turn the ignition switch to ON.


e.

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

Standard Voltage:
Tester Connection Condition Specified Condition
G16-39 (IG+) - Body ground Ignition switch ON 11 to 14 V
G16-40 (B) - Body ground Always 11 to 14 V



f.

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

Standard Resistance:
Tester Connection Condition Specified Condition
G16-21 (ET) - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

6.CHECK SRS WARNING LIGHT (SHORT TO GROUND)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.CHECK SRS WARNING LIGHT (SHORT TO GROUND)
a.

Turn the ignition switch off.


b.

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


c.

Connect the connector to the combination meter assembly.


d.

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


e.

Turn the ignition switch to ON.


f.

Check the SRS warning light condition.

OK:

After the primary check period, the SRS warning light goes off for approximately 10 seconds and then remains on.


HINT:

The primary check period is approximately 6 seconds after the ignition switch is turned to ON.



Result:
Proceed to
OK
NG



OK

REPLACE AIRBAG SENSOR ASSEMBLY

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


NG

GO TO METER / GAUGE SYSTEM

Click hereVehicle Interior>METER / GAUGE / DISPLAY>METER / GAUGE SYSTEM>HOW TO PROCEED WITH TROUBLESHOOTING