Hyundai Elantra MD/UD: Transmitter Code Registration (Using Code Saver) - Transmitter. Repair 
procedures - Keyless Entry And Burglar Alarm - Body Electrical System - Hyundai Elantra MD 2010-2015 Service manualHyundai Elantra MD/UD: Transmitter Code Registration (Using Code Saver)

1.
Open Door.
2.
Connect POWER (B+) and GND, signal line of Code Saver.
3.
If connection is normal, signal line is activated and RED LED turns ON.
4.
If switch of Code Saver turns ON, data via signal line will be transmitted.
5.
BCM enters into Code Save mode when it receives data from Code Saver and send Code Save Start signal via signal line.
6.
Code Saver turns Green LED ON when it receives Code Save Start signal.
7.
When you press Lock or Unlock button of transmitter, BCM will save Codes.
8.
If there are 2 transmitters for Code Saving, register by performing item 7).
9.
If switch of Code Saver turns OFF or is disconnected, Code Saving mode will be finished.
Code saving method
NO
Saved code
Code to change
Changed code
1
A
C
C (A is deleted)
2
A, B, C, D
E
E (A, B, C, D are deleted)
3
A, B
C, D, E
C, D
4
A, B
C, C, D
C

Inspection
1. Check that the red light flickers when the door lock or unlock button is pressed on the transmitter. 2. Remove the battery (A) and check ...

Transmitter Code Registration (Using GDS)
1. Connect the DLC cable of GDS to the data link connector (16 pins) in driver side crash pad lower panel, turn the power on GDS. 2. ...