How to Check if Air bag Warning Light On

How to check if airbag warning light on always.
What may be the cause of airbag indicator light on always.

Model: Hyundai Azera

Year Model: 2009

Fuel: Gasoline

Displacement: 3300cc

1) Condition

1. Esp/Airbag warning light is “On” when driving.

2) Cause

1. Internal fault of steering angle sensor.

3) Diagnosis

1. Scan tool check.
   = Trouble code ( C1260 – Steering Angle Sensor Signal.
   =General Description.
   =The steering angle sensor (SAS) joined to the multifunction switch and using a CAN communication.The SAS is composed of main gear,serve gear 1 and serve gear 2 to determine the turning direction. If main gear is rotated according to the rotation of the steering wheel gear serve 1 serve gear 2, which is contact with main gear, will be rotated.
   =The HECU detects the absolute angle by using magnetic MR effects and the different gear ratio of each serve gear and then send to the  CAN communication line.
   =The HECU detects the steering wheel’s operating wheel speed and operating wheel angle by using absolute angle , and this signal is used as input signal of anti-roll control.
   = If the SAS signal is different from calculated value by Yaw-rate sensor and wheel speed sensor,mechanically impossible  SAS signal is detected , there is a different between SAS signal and driving condition of the vehicle calculated from the Yaw-rate sensor and later G-sensor , a failure is detected.
2. Possible cause.Short of steering angle sensor,Faulty steering angle sensor,Faulty HECU.
3. Current data monitoring
   Steering angle sensor ( 0 ) degrees always.
4. Replace Steering angle sensor. then calibrate with GDS or G-Scan.
   =the problem disappeared.

4) Repair Guides

• Replace with new Steering angle sensor.

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