Toyota Yaris: Airbag System / SRS Warning Light does not Come ON

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / Vehicle Interior / 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 turns off automatically.

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

WIRING DIAGRAM

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CAUTION / NOTICE / HINT

NOTICE:

After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal.
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Inspect the fuses for circuits related to this system before performing the following procedure.
When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.

HINT:

When disconnecting and reconnecting the cable to the auxiliary battery terminal, there is an automatic learning function that completes learning when the respective system is used.

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PROCEDURE

1.	CHECK AUXILIARY BATTERY VOLTAGE

(a) Measure the voltage of the auxiliary battery with the ignition switch off.

Standard Voltage:

11 to 14 V

REPLACE OR RECHARGE AUXILIARY BATTERY

2.	CHECK CONNECTION OF CONNECTOR

(a) Turn the ignition switch off.

(b) Disconnect the cable from the negative (-) auxiliary battery terminal.

CAUTION:

Wait at least 60 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

OK:

The connector is properly connected.

CONNECT CONNECTOR PROPERLY

3.	CHECK CONNECTOR

(a) Disconnect the connector from the combination meter assembly.

(b) Check that the terminals of the connector are not deformed or damaged.

OK:

The terminals are not deformed or damaged.

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	CHECK WIRE HARNESS (COMBINATION METER ASSEMBLY - AUXILIARY BATTERY AND BODY GROUND)

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

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

(b) Turn the ignition switch to ON.

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
H6-38 (IG+) - Body ground	Ignition switch ON	10.5 to 16 V

(d) Turn the ignition switch off.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
H6-23 (ES) - Body ground	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	CHECK SRS WARNING LIGHT

(a) Disconnect the cable from the negative (-) auxiliary battery terminal.

CAUTION:

Wait at least 60 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

*1	Combination Meter Assembly
*2	Airbag Sensor Assembly
*3	Wire Harness

(b) Connect the connector to the combination meter assembly.

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

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

OK:

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

HINT:

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

REPLACE AIRBAG SENSOR ASSEMBLY

REPLACE COMBINATION METER ASSEMBLY

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