SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: SRS Warning Light Remains ON; 2018 MY Camry [03/2017

Last Modified: 11-20-2023	6.11:8.1.0	Doc ID: RM1000000012SO7
Model Year Start: 2018	Model: Camry	Prod Date Range: [03/2017 - 06/2017]
Title: SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: SRS Warning Light Remains ON; 2018 MY Camry [03/2017 - 06/2017]

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 turns 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 sensor assembly, combination meter assembly or wire harness connected to the airbag sensor assembly or combination meter assembly, the SRS warning light comes on.

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 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 turns 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 via CAN communication.

WIRING DIAGRAM

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

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 turns off and comes on again.	B

GO TO STEP 6

2.	CHECK BATTERY VOLTAGE

(a) Measure the voltage of the battery.

Standard Voltage:

11 to 14 V

INSPECT CHARGING SYSTEM AND BATTERY

3.	CHECK CONNECTOR

(a) Turn the ignition switch off.

(b) 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.

OK:

The connector is properly connected.

HINT:

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

(d) Disconnect the connector from the airbag sensor assembly.

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

OK:

The terminals are not deformed or damaged.

REPLACE WIRE HARNESS

4.	CHECK WIRE HARNESS (AIRBAG SENSOR ASSEMBLY - BODY GROUND)

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

*a	Front view of wire harness connector (to Airbag Sensor Assembly)

(b) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
K73-36 (IG2) - 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
K73-33 (E1) - Body ground	Always	Below 1 Ω
K73-32 (E2) - Body ground	Always	Below 1 Ω

REPLACE WIRE HARNESS

5.	CHECK SRS WARNING LIGHT

(a) 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

6.	CHECK CAN COMMUNICATION SYSTEM

(a) Using the Techstream, check if the CAN communication system is functioning normally.

OK:

CAN communication system is functioning normally.

HINT:

Refer to Communication Bus Check in CAN Communication System.

Click here

GO TO CAN COMMUNICATION SYSTEM

7.	CHECK BATTERY VOLTAGE

(a) Measure the voltage of the battery.

Standard Voltage:

11 to 14 V

INSPECT CHARGING SYSTEM AND BATTERY

8.	CHECK CONNECTOR

(a) Turn the ignition switch off.

(b) 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.

OK:

The connector is properly connected.

HINT:

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

(d) Disconnect the connector from the airbag sensor assembly.

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

OK:

The terminals are not deformed or damaged.

REPLACE WIRE HARNESS

9.	CHECK WIRE HARNESS (AIRBAG SENSOR ASSEMBLY - BODY GROUND)

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

*a	Front view of wire harness connector (to Airbag Sensor Assembly)

(b) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
K73-36 (IG2) - 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
K73-33 (E1) - Body ground	Always	Below 1 Ω
K73-32 (E2) - Body ground	Always	Below 1 Ω

REPLACE WIRE HARNESS

10.	CHECK CONNECTOR

(a) 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.

(b) 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.

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

OK:

The terminals are not deformed or damaged.

REPAIR OR REPLACE CONNECTOR

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

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

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

(b) Turn the ignition switch to ON.

Standard Voltage:

Tester Connection	Condition	Specified Condition
K21-39 (IG+) - Body ground	Ignition switch ON	11 to 14 V
K21-40 (B) - Body ground	Always	11 to 14 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
K21-21 (ES) - Body ground	Always	Below 1 Ω

REPAIR OR REPLACE WIRE HARNESS

12.	CHECK SRS WARNING LIGHT

(a) 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.

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

(d) 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