DESCRIPTION
The SRS warning light is located on the combination meter assembly.
When the SRS is normal, the SRS warning light comes on for approximately 6 seconds after the power switch is turned from off to on (IG), 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, the DTC is displayed by 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 auxiliary battery voltage drops, the voltage-increase circuit (DC-DC converter) functions to increase the voltage of the SRS to normal voltage. In addition, when the voltage drops, the SRS warning light will illuminate.
A malfunction in this circuit is not stored 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
INSPECTION PROCEDURE
Note
After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work Click here.
PROCEDURE
CHECK SRS WARNING LIGHT OPERATION
Check the SRS warning light operation approximately 6 seconds after the power switch is turned on (IG).
Result | ||||||
---|---|---|---|---|---|---|
|
B |
CHECK CAN COMMUNICATION SYSTEM Click here |
A |
CHECK AUXILIARY BATTERY VOLTAGE
Measure the voltage of the auxiliary battery.
Standard Voltage |
---|
11 to 14 V |
NG |
INSPECT AUXILIARY BATTERY Click here |
OK |
CHECK CONNECTOR
Turn the power switch off.
Disconnect the cable from the negative (-) auxiliary battery terminal.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.
Check that the connector is properly connected to the airbag sensor assembly.
OK |
---|
The connector is properly connected. |
Tech Tips
If the connector is not connected securely, reconnect the connector and proceed to the next inspection.
Disconnect the connector from the airbag sensor assembly.
Check that the terminal of the connector is not damaged.
OK |
---|
The terminal is not deformed or damaged. |
NG |
REPLACE WIRE HARNESS |
OK |
CHECK WIRE HARNESS (AIRBAG SENSOR ASSEMBLY - BODY GROUND)
*a | Front view of wire harness connector (to Airbag Sensor Assembly) |
Connect the cable to the negative (-) auxiliary battery terminal.
Turn the power switch on (IG).
Operate all components of the electrical system (defogger, wipers, headlights, heater blower, etc.).
Measure the voltage according to the value(s) in the table below.
Standard Voltage | ||||||
---|---|---|---|---|---|---|
|
Turn the power switch off.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
NG |
REPLACE WIRE HARNESS |
OK |
CHECK SRS WARNING LIGHT
Turn the power switch on (IG).
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. |
Tech Tips
The primary check period is approximately 6 seconds after the power switch is turned on (IG).
NG |
REPLACE COMBINATION METER ASSEMBLY Click here |
OK |
REPLACE AIRBAG SENSOR ASSEMBLY Click here
CHECK CAN COMMUNICATION SYSTEM
Use the intelligent tester to check if the CAN communication system is functioning normally.
Tech Tips
Refer to Bus Check for the CAN communication system Click here.
The airbag sensor assembly is connected to the CAN communication system. Therefore, before starting troubleshooting, make sure to check that there is no trouble in the CAN communication system.
Result | ||||||
---|---|---|---|---|---|---|
|
B |
GO TO CAN COMMUNICATION SYSTEM Click here |
A |
CHECK AUXILIARY BATTERY VOLTAGE
Measure the voltage of the auxiliary battery.
Standard Voltage |
---|
11 to 14 V |
NG |
INSPECT AUXILIARY BATTERY Click here |
OK |
CHECK CONNECTOR
Turn the power switch off.
Disconnect the cable from the negative (-) auxiliary battery terminal.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.
Check that the connector is properly connected to the airbag sensor assembly.
OK |
---|
The connector is properly connected. |
Tech Tips
If the connector is not connected securely, reconnect the connector and proceed to the next inspection.
Disconnect the connector from the airbag sensor assembly.
Check that the terminal of the connector is not damaged.
OK |
---|
The terminal is not deformed or damaged. |
NG |
REPLACE WIRE HARNESS |
OK |
CHECK WIRE HARNESS (AIRBAG SENSOR ASSEMBLY - BODY GROUND)
*a | Front view of wire harness connector (to Airbag Sensor Assembly) |
Connect the cable to the negative (-) auxiliary battery terminal.
Turn the power switch on (IG).
Operate all components of the electrical system (defogger, wipers, headlights, heater blower, etc.).
Measure the voltage according to the value(s) in the table below.
Standard Voltage | ||||||
---|---|---|---|---|---|---|
|
Turn the power switch off.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
NG |
REPLACE WIRE HARNESS |
OK |
CHECK CONNECTOR
Disconnect the cable from the negative (-) auxiliary battery terminal.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary 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. |
Tech Tips
If the connector is not connected securely, reconnect the connector and proceed to the next inspection.
Disconnect the connector from the combination meter assembly.
Check that the terminal of the connector is not damaged.
OK |
---|
The terminal is not deformed or damaged. |
NG |
REPLACE WIRE HARNESS |
OK |
CHECK WIRE HARNESS (COMBINATION METER ASSEMBLY - BODY GROUND)
*a | Front view of wire harness connector (to Combination Meter Assembly) |
Connect the cable to the negative (-) auxiliary battery terminal.
Turn the power switch on (IG).
Measure the voltage according to the value(s) in the table below.
Standard Voltage | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
Turn the power switch off.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
NG |
REPLACE WIRE HARNESS |
OK |
CHECK SRS WARNING LIGHT
Disconnect the cable from the negative (-) auxiliary battery terminal.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.
Connect the connector to the combination meter assembly.
Connect the cable to the negative (-) auxiliary battery terminal.
Turn the power switch on (IG).
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. |
Tech Tips
The primary check period is approximately 6 seconds after the power switch is turned on (IG).
NG |
REPLACE COMBINATION METER ASSEMBLY Click here |
OK |
REPLACE AIRBAG SENSOR ASSEMBLY Click here