Question about Hyundai Motor 2002 Sonata

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2002 sonata 4 door. The key will unlock all doors but is unable to be used to lock the doors. The paddle switch on drivers door likewise can unlock all doors but cannot be used to lock them. Only by manual locking of each door can the car be secured. Any clues?

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Door 'LOCK" relay

Posted on Jun 30, 2009

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2007 sonata driver door won't unlock with key fob


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Drivers door will not open with key or battery hand piece,,other doors okay with both. 2002 crv


-If the problem is that keyless remote does unlock or lock door, but the lock lever still move when pulling up and down by hand. Door still open and close with both inner and outer, then might the driver door lock actuator is bad. The actuator lock and unlock the door for you when using the keyless remote or door lock/unlock switch.

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My 02 Sonata can be unlocked (all 4 doors) from the outside using the key in either the driver or passenger door, but will not lock. Any suggestions?


Yep... more information!.. same behavior when keyless remote is used?... IF SO, then you have a bad relay - door 'LOCK' relay.

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Hyundai 2002 sonata,,,, car has power locks.


You are correct in your assumption about a relay... there are two relays. One is for 'LOCKING' the other is for 'UN-LOCKING.' They are both labeled as "LOCK" relays (1 & 2). You can verify if a relay is bad by swapping one with the other. If the problem moves to 'unlocking' the doors, but will NOW LOCK - the relay is bad. If not, further troubleshooting is necessary.
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Program remote control for mazda mpv 2002


Courtesy of: forums.mazdaworld.org

Try this, it works on several 2002 models:


Step 1: Open drivers door and leave open.

Step 2: Lock and unlock the drivers door using the power door lock switch on the door.

Step 3: Insert key into the ignition.

Step 4: Turn key to on position and return to off position. (IMPORTANT - use ON position NOT ACC position). Do this 3 times within 10 seconds. Leave key in the ignition.

Step 5: Open and close the drivers door 3 times. (Door should be left open after this step).

Step 6: ECU should respond by locking and unlocking the doors.

Step 7: Press any button on remote #1. ECU responds by locking and unlocking the car doors.

Step 8: Press any button on remote #2 (etc.) Each time the ECU will respond by locking & unlocking the doors.

Step 9: Remove the key from the ignition and the ECU will respond a final time with a series of door locks and unlocks. You're done

Dec 06, 2008 | 2000 Mazda MPV

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Unable to unlock remotely or from driver side door button


hi did you sort this fault out i have the same problem

Nov 13, 2008 | 2006 Hyundai Sonata

2 Answers

Keyless entry remote


Try this, it works on several 2002 models:


Step 1: Open drivers door and leave open.

Step 2: Lock and unlock the drivers door using the power door lock switch on the door.

Step 3: Insert key into the ignition.

Step 4: Turn key to on position and return to off position. (IMPORTANT - use ON position NOT ACC position). Do this 3 times within 10 seconds. Leave key in the ignition.

Step 5: Open and close the drivers door 3 times. (Door should be left open after this step).

Step 6: ECU should respond by locking and unlocking the doors.

Step 7: Press any button on remote #1. ECU responds by locking and unlocking the car doors.

Step 8: Press any button on remote #2 (etc.) Each time the ECU will respond by locking & unlocking the doors.

Step 9: Remove the key from the ignition and the ECU will respond a final time with a series of door locks and unlocks.

Jun 20, 2008 | 2002 Mazda Protege

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