SUPPLEMENTAL RESTRAINT SYSTEMS AIRBAG SYSTEM SRS Warning Light does not Come 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.

If a malfunction occurs in the airbag ECU assembly, combination meter assembly or wire harness connected to the airbag ECU assembly or combination meter assembly, the SRS warning light turns on.

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

The SRS is equipped with a voltage-increase circuit (DC-DC converter) in the airbag ECU 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 stored in the airbag ECU 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 ECU assembly to the combination meter assembly via the CAN communication system.

WIRING DIAGRAM

0.729,1.823 1.615,2.156 0.885,0.333 10 false from Battery 5.031,0.729 5.906,0.979 0.875,0.25 10 false A/BAG 2.26,1.417 3.073,1.677 0.813,0.26 10 false METER 2.104,1.969 3.021,2.24 0.917,0.271 10 false ECU-B NO. 2 3.094,2.365 3.396,2.635 0.302,0.271 10 false ET 2.854,1.719 3.125,2.01 0.271,0.292 10 false 40 2.865,1.177 3.188,1.427 0.323,0.25 10 false 39 5.802,1.115 6.208,1.385 0.406,0.271 10 false 13 4.094,1.125 4.417,1.375 0.323,0.25 10 false 32 2.854,2.271 3.25,2.594 0.396,0.323 10 false 21 6.052,0.594 6.427,0.906 0.375,0.313 10 false IG2 3.615,1.26 4.302,1.583 0.688,0.323 10 false CANH 3.635,1.823 4.25,2.177 0.615,0.354 10 false CANL 6.063,2.365 6.354,2.625 0.292,0.26 10 false E1 6.063,2.875 6.354,3.125 0.292,0.25 10 false E2 6.01,3.615 6.521,3.906 0.51,0.292 10 false E14 3.042,3.604 3.448,3.854 0.406,0.25 10 false E43 5.99,3.771 6.844,4.271 0.854,0.5 10 false Airbag ECU Assembly 3.042,3.771 4.24,4.333 1.198,0.563 10 false Combination Meter Assembly 5.802,1.677 6.313,1.958 0.51,0.281 10 false 22 6.052,1.26 6.583,1.5 0.531,0.24 10 false CANH 6.052,1.802 6.552,2.021 0.5,0.219 10 false CANL 5.802,0.49 6.25,0.781 0.448,0.292 10 false 21 5.813,2.271 6.208,2.521 0.396,0.25 10 false 25 5.813,2.781 6.104,2.979 0.292,0.198 10 false 26 4.094,1.677 4.5,2.031 0.406,0.354 10 false 31 3.104,1.813 3.406,2.031 0.302,0.219 10 false B 3.104,1.26 3.479,1.49 0.375,0.229 10 false IG+ 0.74,4.177 2.51,4.479 1.771,0.302 10 false : CAN Communication Line 3.354,0.594 4.448,0.854 1.094,0.26 10 false from IG2 Relay 0.563,1.24 1.656,1.5 1.094,0.26 10 false from IG2 Relay

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

·

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

PROCEDURE

1.CHECK BATTERY VOLTAGE

Measure the voltage of the battery.

Standard Voltage:: 11 to 14 V

Result:

Proceed to
OK
NG

2.CHECK CONNECTOR

INSPECT CHARGING SYSTEM AND BATTERY

for 2NZ-FE: Click herePower Source / Network>2NZ-FE BATTERY / CHARGING>CHARGING SYSTEM>ON-VEHICLE INSPECTION

for 1ZR-FE: Click herePower Source / Network>1ZR-FE BATTERY / CHARGING>CHARGING SYSTEM>ON-VEHICLE INSPECTION

for 2ZR-FE: Click herePower Source / Network>2ZR-FE BATTERY / CHARGING>CHARGING SYSTEM>ON-VEHICLE INSPECTION

2.CHECK CONNECTOR

Turn the ignition switch off.

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.

Check that the connector is properly connected to the combination meter assembly.

OK:: The connector is properly connected.

HINT:: If the connector is not properly connected, reconnect the connector and proceed to the next inspection.

Disconnect the connector from the combination meter assembly.

Check that the terminals of the connector are not damaged.

OK:: The terminals are not deformed or damaged.

Result:

Proceed to
OK
NG

3.CHECK WIRE HARNESS (COMBINATION METER ASSEMBLY - BODY GROUND)

REPAIR OR REPLACE CONNECTOR

3.CHECK WIRE HARNESS (COMBINATION METER ASSEMBLY - BODY GROUND)

0.271,0.458 0.604,0.677 0.333,0.219 3.094,1.677 3.094,0.385 3.094,0.385 2.927,0.385 false 0.531,1.719 0.865,1.719 false 2.969,1.677 2.969,0.708 2.969,0.708 2.719,0.708 false 0.104,0.063 0.406,0.323 0.302,0.26 10 false *a 2.479,0.635 2.813,0.854 0.333,0.219 10 false IG+ 2.813,0.313 3.073,0.531 0.26,0.219 10 false B 0.344,1.635 0.646,1.906 0.302,0.271 10 false ET 0.323,0.49 0.667,0.677 0.344,0.188 10 false E43

*a	Front view of wire harness connector (to Combination Meter Assembly)

Connect the cable to the negative (-) battery terminal.

Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
E43-39 (IG+) - Body ground	Ignition switch ON	11 to 14 V
E43-40 (B) - Body ground	Always	11 to 14 V

Turn the ignition switch off.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
E43-21 (ET) - Body ground	Always	Below 1 Ω

Result:

Proceed to
OK
NG

4.CHECK SRS WARNING LIGHT

REPAIR OR REPLACE WIRE HARNESS

4.CHECK SRS WARNING LIGHT

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.

Connect the connector to the combination meter assembly.

Disconnect the connector from the airbag ECU assembly.

Connect the cable to the negative (-) battery terminal.

Turn the ignition switch to ON and check the SRS warning light condition.

OK:: After the primary check period, the SRS warning light goes off for approximately 10 seconds and turns back on.

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

Result:

Proceed to
OK
NG

REPLACE AIRBAG ECU ASSEMBLY

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

REPLACE COMBINATION METER ASSEMBLY

Click hereVehicle Interior>METER / GAUGE / DISPLAY>COMBINATION METER>REMOVAL