AIRBAG SYSTEM(w/o Curtain Shield Airbag) SRS Warning Light Remains ON

Click here

DESCRIPTION

The SRS warning light is located on the combination meter assembly.

When the SRS condition is normal, the SRS warning light illuminates 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 illuminates or blinks to inform the driver of the problem. When terminals TC and CG of the DLC3 are connected, the SRS warning light blinks to indicate DTCs.

The airbag sensor assembly is equipped with a voltage-increase circuit (DC-DC converter) in case the source voltage decreases. When the battery voltage decreases, the voltage-increase circuit (DC-DC converter) boosts the SRS voltage up to the normal level.

Malfunctions relating to battery voltage decreases cause the SRS warning light to illuminate. However, no DTCs are recorded in the airbag sensor assembly. The SRS warning light goes off automatically when the source voltage returns to normal.

Signals to illuminate the SRS warning light are transmitted from the airbag sensor assembly to the combination meter assembly through the CAN communication system.

Click here

CAUTION / NOTICE / HINT

Click here

PROCEDURE

1. Click here

   CHECK FOR DTC (CAN COMMUNICATION SYSTEM)

   
   

   1. Turn the ignition switch to ON.

   2. Check the DTCs (Click here).

      OK
      DTC is not output.
      Table 1. Result Result Proceed to OK A NG (w/ Toyota Safety Sense) B NG (w/ Toyota Safety Sense) C

   
   
   • AClick here
   • B

     GO TO CAN COMMUNICATION SYSTEM (Click here)

   • C

     GO TO CAN COMMUNICATION SYSTEM (Click here)

2. Click here

   INSPECT BATTERY

   
   

   1. Measure the voltage of the battery.

      Standard Voltage
      Tester Connection Condition Specified Condition Battery Always 11 to 14 V

      Table 2. Result

      Result	Proceed to
      OK	A
      NG (for 2NR-FKE)	B
      NG (for 1ND-TV)	C
      NG (for 1KR-FE)	D

   
   
   • AClick here
   • B

     CHECK AND REPLACE BATTERY OR CHARGING SYSTEM

     
     

     • w/ Stop and start system:

       (Click here)

     • w/o Stop and start system:

       (Click here)

   • C

     CHECK AND REPLACE BATTERY OR CHARGING SYSTEM (Click here)

   • D

     CHECK AND REPLACE BATTERY OR CHARGING SYSTEM (Click here)

3. Click here

   CHECK CONNECTION OF CONNECTORS

   
   

   1. Turn the ignition switch off.

   2. 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.

   3. Check that the connectors are properly connected to the airbag sensor assembly and combination meter assembly.

      OK
      The connectors are properly connected.

   
   
   • OKClick here
   • NG

     CONNECT CONNECTORS PROPERLY

4. Click here

   CHECK HARNESS AND CONNECTOR (SOURCE VOLTAGE OF AIRBAG SENSOR ASSEMBLY)

   
   
   1. 

      Disconnect the connectors from the airbag sensor assembly.

   2. Connect the cable to the negative battery terminal, and wait for at least 2 seconds.

   3. Turn the ignition switch to ON.

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

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition F16-21 (IG2) - F16-25 (E1) Ignition switch ON 11 to 14 V F16-21 (IG2) - F16-26 (E2) Ignition switch ON 11 to 14 V

      Table 3. Text in Illustration

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

   
   
   • OKClick here
   • NG

     REPLACE HARNESS AND CONNECTOR

5. Click here

   CHECK HARNESS AND CONNECTOR (SOURCE VOLTAGE OF COMBINATION METER ASSEMBLY)

   
   
   1. 

      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.

   2. Disconnect the connector from the combination meter assembly.

   3. Connect the cable to the negative battery terminal, and wait for at least 2 seconds.

   4. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition F1-39 (IG+) - F1-21 (ET) Ignition switch ON 11 to 14 V F1-10 (IB) - F1-21 (ET) Always 11 to 14 V

      Table 4. Text in Illustration

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

      Table 5. Result

      Result	Proceed to
      OK	A
      NG (except IG+)	B
      NG (for IG+)	C

   
   
   • AClick here
   • B

     REPAIR OR REPLACE HARNESS OR CONNECTOR

   • C

     GO TO STOP AND START SYSTEM (Click here)

6. Click here

   CHECK SRS WARNING LIGHT

   
   

   1. Turn the ignition switch off.

   2. 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.

   3. Connect the connector to the combination meter assembly.

   4. Connect the cable to the negative battery terminal, and wait for at least 2 seconds.

   5. Turn the ignition switch to ON.

   6. Check the SRS warning light condition.

      OK
      The SRS warning light goes off after the primary check period and comes on again after approximately 10 seconds.

      Tip:

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

   
   
   • OK

     REPLACE AIRBAG SENSOR ASSEMBLY (Click here)

   • NG

     REPLACE COMBINATION METER ASSEMBLY (Click here)