Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSHYUNDAI2003ELANTRA L4-2.0LREPAIR AND DIAGNOSISBODY AND FRAMELOCKSKEYLESS ENTRYKEYLESS ENTRY TRANSMITTERTESTING AND INSPECTION
2003 Hyundai Elantra L4-2.0L
Keyless Entry Transmitter: Testing and Inspection
2003 Hyundai Elantra L4-2.0LSECTION Testing and Inspection
TRANSMITTER CODE SAVING METHOD
USING CODE SAVING SWITCH

1. Remove the center facia panel.
NOTE: Don't disconnect the negative (-) battery terminal.
2. To store new codes:
- Activate the keyless entry/receiver unit and change the code saving switch of the receiver unit from "OFF" to "SET".
- The secret codes from the transmitter will be stored into the receiver unit when the door lock button or unlock button is pressed on the transmitter.

- Save the 2nd transmitter codes in the same manner.

3. Return the code saving switch of the receiver unit from "SET" to "OFF".
4. Install the center facia panel.
USING HI-SCAN

1. To store transmitter code, first connect keyless adapter (09900-21300) to DLC (Data Link Connector) cable of hi-scan as shown in the illustration.

2. After connecting keyless adapter to the multi purpose check connector (10 pins) beside data link connector in driver side crash pad lower panel, turn the power on hi-scan.

3. Select "02. ELANTRA" in the figure as shown.

4. Select "07. TRANSMITTER CODE SAVING" and press ENTER key.

5. When pressed, following screen will be displayed, select "01. 2001-" in the figure as shown.

6. When pressed, the screen will be displayed as shown.

7. After removing the ignition key from key cylinder, push "ENTER" key to proceed to the next mode for code saving.
8. Follow steps 1 to 3 and then code saving is completed.
9. Disconnect keyless adapter (09900-21300) from DLC cable and then proceed to self-diagnosis with DLC cable connected.
USING CODE SAVING SWITCH
1. Remove the center facia panel.
NOTE: Don't disconnect the negative (-) battery terminal.
2. To store new codes:
- Activate the keyless entry/receiver unit and change the code saving switch of the receiver unit from "OFF" to "SET".
- The secret codes from the transmitter will be stored into the receiver unit when the door lock button or unlock button is pressed on the transmitter.
- Save the 2nd transmitter codes in the same manner.
3. Return the code saving switch of the receiver unit from "SET" to "OFF".
4. Install the center facia panel.
USING HI-SCAN
1. To store transmitter code, first connect keyless adapter (09900-21300) to DLC (Data Link Connector) cable of hi-scan as shown in the illustration.
2. After connecting keyless adapter to the multi purpose check connector (10 pins) beside data link connector in driver side crash pad lower panel, turn the power on hi-scan.
3. Select "02. ELANTRA" in the figure as shown.
4. Select "07. TRANSMITTER CODE SAVING" and press ENTER key.
5. When pressed, following screen will be displayed, select "01. 2001-" in the figure as shown.
6. When pressed, the screen will be displayed as shown.
7. After removing the ignition key from key cylinder, push "ENTER" key to proceed to the next mode for code saving.
8. Follow steps 1 to 3 and then code saving is completed.
9. Disconnect keyless adapter (09900-21300) from DLC cable and then proceed to self-diagnosis with DLC cable connected.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.