Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM10000000259U2
Model Year Start: 2023 Model: GR Corolla Prod Date Range: [09/2022 - 11/2022]
Title: SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM (for TMC Made): SRS Warning Light Remains ON; 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]

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.

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.

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

CAUTION / NOTICE / HINT

NOTICE:

  • After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal.

    Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 -        ]; SETUP: WHEN DISCONNECTING OR RECONNECTING BATTERY TERMINAL: BEFORE DISCONNECTING BATTERY

    HINT:

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

    Click here 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; SETUP: WHEN DISCONNECTING OR RECONNECTING BATTERY TERMINAL: AUTOMATIC LEARNING CHART

  • After replacing the airbag sensor assembly, refer to work procedure.

    Click here 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; SETUP: WHEN REPLACING OR REMOVING/INSTALLING PARTS: WORK PROCEDURE

  • 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 the SRS warning light is illuminated due to a drop in supply power voltage, check the vehicle control history (RoB) before performing an inspection as the airbag sensor assembly stores vehicle control history (RoB) (X210B).

Click here 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM (for TMC Made): VEHICLE CONTROL HISTORY (RoB)

PROCEDURE

1.

CHECK SRS WARNING LIGHT OPERATION

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

HINT:

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

Result

Proceed to

After the primary check period, the SRS warning light remains on.

A

After the primary check period, the SRS warning light goes off and comes on again.

B
B

GO TO STEP 7

A

2.

CHECK AUXILIARY BATTERY

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

Standard Voltage:

11 to 14 V

NG

REPLACE OR RECHARGE AUXILIARY BATTERY
OK

3.

CHECK CONNECTION OF CONNECTOR

(a) Turn the ignition switch off.

(b) Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 60 seconds.

(c) Check that the connector is properly connected to the airbag sensor assembly.

OK:

The connector is properly connected.

NG

CONNECT CONNECTOR PROPERLY
OK

4.

CHECK CONNECTOR

(a) Disconnect the airbag sensor assembly connector.

*1

Combination Meter Assembly

*2

Airbag Sensor Assembly

*3

Wire Harness

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

OK:

The terminals are not deformed or damaged.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

5.

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

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

*a

Front view of wire harness connector

(to Airbag Sensor Assembly)

(b) Turn the ignition switch to ON.

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

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

I47-36 (IGR) - Body ground

Ignition switch ON

8 to 16 V

(e) Turn the ignition switch off.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I47-33 (E1) - Body ground

Always

Below 1 Ω

I47-32 (E2) - Body ground

Always

Below 1 Ω
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

6.

CHECK SRS WARNING LIGHT

(a) Turn the ignition switch to ON.

*1

Combination Meter Assembly

*2

Airbag Sensor Assembly

*3

Wire Harness

(b) Approximately 6 seconds after the ignition switch is turned to ON, check the condition of the SRS warning light.

Result

Proceed to

Turns off for 10 seconds, and then illuminates

A

Turns off for 10 seconds, and then remains off

B
A

REPLACE AIRBAG SENSOR ASSEMBLY

B

REPLACE COMBINATION METER ASSEMBLY

7.

CHECK CAN COMMUNICATION SYSTEM

(a) Check if a CAN communication DTC is output.

for HV Model: Click here 2023 MY Corolla Corolla HV [09/2022 - 11/2022]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): DIAGNOSIS SYSTEM

for Gasoline Model: Click here 2023 MY Corolla Corolla Hatchback GR Corolla [09/2022 - 11/2022]; NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model TMC Made): DIAGNOSIS SYSTEM

Result

Proceed to

DTC is not output

A

DTCs are output

B
B

GO TO CAN COMMUNICATION SYSTEM

for HV Model: Click here 2023 - 2025 MY Corolla Corolla HV [09/2022 -        ]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): HOW TO PROCEED WITH TROUBLESHOOTING

for Gasoline Model: Click here 2023 MY Corolla Corolla Hatchback GR Corolla [09/2022 - 11/2022]; NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model TMC Made): HOW TO PROCEED WITH TROUBLESHOOTING

A

8.

CHECK AUXILIARY BATTERY

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

Standard Voltage:

11 to 14 V

NG

REPLACE OR RECHARGE AUXILIARY BATTERY
OK

9.

CHECK CONNECTION OF CONNECTORS

(a) Turn the ignition switch off.

(b) Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 60 seconds.

(c) Check that the connectors are properly connected to the airbag sensor assembly and combination meter assembly.

OK:

The connectors are properly connected.

NG

CONNECT CONNECTORS PROPERLY
OK

10.

CHECK CONNECTORS

(a) Disconnect the airbag sensor assembly connector.

*1

Combination Meter Assembly

*2

Airbag Sensor Assembly

*3

Wire Harness

(b) Disconnect the combination meter assembly connector.

(c) Check that the terminals of the connectors are not deformed or damaged.

OK:

The terminals are not deformed or damaged.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

11.

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

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

*a

Front view of wire harness connector

(to Airbag Sensor Assembly)

(b) Turn the ignition switch to ON.

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

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

I47-36 (IGR) - Body ground

Ignition switch ON

8 to 16 V

(e) Turn the ignition switch off.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I47-33 (E1) - Body ground

Always

Below 1 Ω

I47-32 (E2) - Body ground

Always

Below 1 Ω
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

12.

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

(a) Turn the ignition switch to ON.

*a

Front view of wire harness connector

(to Combination Meter Assembly)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

I4-6 (IG+) - Body ground

Ignition switch ON

11 to 14 V

(c) Turn the ignition switch off.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I4-1 (EP) - Body ground

Always

Below 1 Ω

I4-2 (ES) - Body ground

Always

Below 1 Ω
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

13.

CHECK SRS WARNING LIGHT

(a) Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 60 seconds.

*1

Combination Meter Assembly

*2

Airbag Sensor Assembly

*3

Wire Harness

(b) Connect the combination meter assembly connector.

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

(d) Turn the ignition switch to ON.

(e) Approximately 6 seconds after the ignition switch is turned to ON, check the condition of the SRS warning light.

Result

Proceed to

Turns off for 10 seconds, and then illuminates

A

Turns off for 10 seconds, and then remains off

B
A

REPLACE AIRBAG SENSOR ASSEMBLY

B

REPLACE COMBINATION METER ASSEMBLY