Hyundai Elantra MD/UD: Installation - Driver Airbag (DAB) Module and Clock Spring. Repair 
procedures - Airbag Module - Restraint - Hyundai Elantra MD 2010-2015 Service manualHyundai Elantra MD/UD: Installation

1.
Remove the ignition key from the vehicle.
2.
Disconnect the battery negative cable from battery and wait for at least three minutes before beginning work.
3.
Connect the clock spring harness connector and horn harness connector to the clock spring.
4.
Set the center position by setting the marks between the clock spring and the cover into line. The mark (▶◀) should be matched by turning the clock spring clockwise to the stop and then 3.0 revolutions counterclockwise.

5.
Install the steering wheel column shroud and the steering wheel. (Refer to the Steering System group - "Steering Column and Shaft")
6.
Connect the Driver Airbag (DAB) module connector and horn connector, and then install the Driver Airbag (DAB) module on the steering wheel.
7.
Connect the battery negative cable.
8.
After installing the airbag, confirm proper system operation:
A.
Turn the ignition switch ON; the SRS indicator light should be turned on for about six seconds and then go off.
B.
Make sure horn button works.

Inspection
Driver Airbag (DAB) If any improper parts are found during the following inspection, replace the airbag module with a new one. ...

Passenger Airbag (PAB) Module. Description and Operation
Description The passenger airbag (PAB) is installed inside the crash pad and protects the front passenger in the event of a frontal crash. The SRSCM determines if and when to deploy the PAB. ...