Airbag System Srs Warning Light Remains On

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT BATTERY

CHECK CONNECTION OF CONNECTOR

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

CHECK HARNESS AND CONNECTOR (SOURCE VOLTAGE OF COMBINATION METER)

CHECK HARNESS AND CONNECTOR (CENTER AIRBAG SENSOR - COMBINATION METER)

CHECK SRS WARNING LIGHT (OPERATION)

CHECK CENTER AIRBAG SENSOR ASSEMBLY

REPLACE CENTER AIRBAG SENSOR ASSEMBLY

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

1. After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work (HILUX_TGN26 RM000004QR1006X.html).
   
2. When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected (HILUX_TGN26 RM000004QR3008X.html).
   
3. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
   

1. Measure the voltage of the battery.
   

   Standard voltage:

   11 to 14 V
   

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 connectors are properly connected to the center airbag sensor and combination meter.
   

   OK:

   The connectors are properly connected.
   

1. Disconnect the connector from the center airbag sensor.
   

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 the 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
   G53-21 (IG2) - Body ground	Ignition switch ON	11 to 14 V

6. Turn the ignition switch off.
   

7. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   G53-25 (E1) - Body ground	Always	Below 1 Ω
   G53-26 (E2) - Body ground	Always	Below 1 Ω

1. Disconnect the G19 connector from the combination meter.
   

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

3. Turn the ignition switch to ON.
   

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

   Standard Voltage:

   Tester Connection	Switch Condition	Specified Condition
   G19-21 (IG+) - Body ground	Ignition switch ON	11 to 14 V

5. Turn the ignition switch off.
   

6. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   G19-22 (EP) - Body ground	Always	Below 1 Ω

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   G53-14 (LA) - G19-20 (SW)	Always	Below 1 Ω
   G53-14 (LA) - Body ground	Always	10 kΩ or higher

   Text in Illustration

   *a	Rear view of wire harness connector (to Center Airbag Sensor)
   *b	Front view of wire harness connector (to Combination Meter)

1. Connect the connector to the combination meter.
   

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

3. Turn the ignition switch to ON.
   

4. Check the SRS warning light condition.
   

   NOTICE:

   Make sure that nobody is in the vehicle.

   OK:

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

   HINT:

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

1. Turn the ignition switch to ON.
   

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

   Standard Voltage:

   Tester Connection	Switch Condition	Specified Condition
   G53-14 (LA) - Body ground	Ignition switch ON	11 to 14 V

1. Turn the ignition switch off.
   

2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
   

3. Replace the center airbag sensor (HILUX_TGN26 RM0000010IE012X.html).
   

4. Check the SRS warning light condition.
   

   OK:

   SRS warning light illuminates normally.