SRS Warning Light Remains ON: Procedure

1. Check the SRS warning light operation approximately 6 seconds after the ignition switch is turned to ON.

   Result

   SRS Warning Light Illumination	Proceed to
   Remains on	A
   Remains on after it goes off	B

B → See step   6 

A: Go to next step 

1. Measure the voltage of the battery.

   Standard Voltage

   11 to 14 V

   Result

   Result	Proceed to
   OK	A
   NG (for 2AZ-FE)	B
   NG (for 2ZR-FE)	C

C → See step   17 

B → See step   13 

A: Go to next step 

1. Turn the ignition switch off.
2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
3. Check that the connector is properly connected to the center airbag sensor assembly.

   OK

   The connector is properly connected.

   HINT: 

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

4. Disconnect the connector from the center airbag sensor assembly.
5. Check that the terminal of the connector is not damaged.

   OK

   The terminal is not deformed or damaged.

NG → REPLACE WIRE HARNESS 

OK: Go to next step 

1. Connect the cable to the negative (-) battery terminal.
   Fig 1: Checking Wire Harness (Center Airbag Sensor Assembly - Body Ground) Connections

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Turn the ignition switch to ON.
3. Operate all components of the electrical system (defogger, wipers, headlights, heater blower, etc.).
4. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   E18-21 (IG2) - Body ground	Ignition switch ON	8 to 16 V

5. Turn the ignition switch off.
6. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E18-25 (E1) - Body ground	Always	Below 1 Ω
   E18-26 (E2) - Body ground	Always	Below 1 Ω

NG → REPLACE WIRE HARNESS 

OK: Go to next step 

1. Turn the ignition switch to ON.
2. Check the SRS warning light operation.

   OK

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

   HINT: 

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

NG → See step   15 

OK → See step   14 

1. Use the Techstream to check if the CAN communication system is functioning normally.

   HINT: 

   • Refer to Bus Check for the CAN communication system . Refer to DIAGNOSIS SYSTEM .
   • The center 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

   Result	Proceed to
   DTC is not output	A
   DTC is output	B

B → See step   16 

A: Go to next step 

1. Measure the voltage of the battery.

   Standard Voltage

   11 to 14 V

   Result

   Result	Proceed to
   OK	A
   NG (for 2AZ-FE)	B
   NG (for 2ZR-FE)	C

C → See step   17 

B → See step   13 

A: Go to next step 

1. Turn the ignition switch off.
2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
3. Check that the connector is properly connected to the center airbag sensor assembly.

   OK

   The connector is properly connected.

   HINT: 

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

4. Disconnect the connector from the center airbag sensor assembly.
5. Check that the terminal of the connector is not damaged.

   OK

   The terminal is not deformed or damaged.

NG → REPLACE WIRE HARNESS 

OK: Go to next step 

1. Connect the cable to the negative (-) battery terminal.
   Fig 2: Checking Wire Harness (Center Airbag Sensor Assembly - Body Ground) Connections

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Turn the ignition switch to ON.
3. Operate all components of the electrical system (defogger, wipers, headlights, heater blower, etc.).
4. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   E18-21 (IG2) - Body ground	Ignition switch ON	8 to 16 V

5. Turn the ignition switch off.
6. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E18-25 (E1) - Body ground	Always	Below 1 Ω
   E18-26 (E2) - Body ground	Always	Below 1 Ω

NG → REPLACE WIRE HARNESS 

OK: Go to next step 

1. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
2. Check that the connector is properly connected to the combination meter assembly.

   OK

   The connector is properly connected.

   HINT: 

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

3. Disconnect the connector from the combination meter assembly.
4. Check that the terminal of the connector is not damaged.

   OK

   The terminal is not deformed or damaged.

NG → REPAIR OR REPLACE WIRE HARNESS 

OK: Go to next step 

1. Connect the cable to the negative (-) battery terminal.
   Fig 3: Checking Wire Harness (Combination Meter Assembly - Body Ground) Connections

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Turn the ignition switch to ON.
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   E55-32 (B) - Body ground	Always	11 to 14 V
   E55-33 (IG+) - Body ground	Ignition switch ON	11 to 14 V

4. Turn the ignition switch off.
5. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E55-30 (ET) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE WIRE HARNESS 

OK: Go to next step 

1. Connect the connector to the combination meter assembly.
2. Connect the cable to the negative (-) battery terminal.
3. Turn the ignition switch to ON.
4. Check the SRS warning light operation.

   OK

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

   HINT: 

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

NG → See step   15 

OK → See step   14