SRS Warning Light Remains ON

SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: SRS Warning Light Remains ON
- SRS Warning Light Remains ON

DESCRIPTION

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

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

If there is a malfunction in the SRS, the SRS warning light illuminates or blinks to inform the driver of the problem. When terminals TC and CG of the DLC3 are connected, the SRS warning light blinks to indicate DTCs.

The center airbag sensor assembly is equipped with a voltage-increase circuit (DC-DC converter) in case the source voltage decreases. When the battery voltage decreases, the voltage-increase circuit (DC-DC converter) boosts the SRS voltage up to the normal level.

Malfunctions relating to battery voltage decreases cause the SRS warning light to illuminate. However, no DTCs are recorded in the center airbag sensor assembly. The SRS warning light turns off automatically when the source voltage returns to normal.

Signals to illuminate the SRS warning light are transmitted from the center airbag sensor assembly to the combination meter assembly through the CAN communication system.

WIRING DIAGRAM





INSPECTION PROCEDURE

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

PROCEDURE

1. CHECK FOR DTC (CAN COMMUNICATION SYSTEM)

(a) Turn the ignition switch to ON.

(b) Check the DTCs Reading and Clearing Diagnostic Trouble Codes.

OK:

DTC is not output.

NG -- GO TO CAN COMMUNICATION SYSTEM How to Proceed With Troubleshooting
OK -- Continue to next step.

2. INSPECT BATTERY

(a) Measure the voltage of the battery.

Standard Voltage:





NG -- CHECK AND REPLACE BATTERY OR CHARGING SYSTEM
OK -- Continue to next step.

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 center airbag sensor assembly and combination meter assembly.

OK:

The connectors are properly connected.

NG -- CONNECT CONNECTORS PROPERLY
OK -- Continue to next step.

4. CHECK HARNESS AND CONNECTOR (SOURCE VOLTAGE OF CENTER AIRBAG SENSOR ASSEMBLY)

(a) Disconnect the connector from the center 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 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:





Text in Illustration





NG -- REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.

5. CHECK HARNESS AND CONNECTOR (SOURCE VOLTAGE OF COMBINATION METER ASSEMBLY)

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





(b) Disconnect the 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:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

6. CHECK SRS WARNING LIGHT

(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:

The SRS warning light turns off after the primary check period and comes on again after approximately 10 seconds.

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

NG -- REPLACE COMBINATION METER ASSEMBLY Removal

OK -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY Removal