L door dose not lock all door locks - 2000 Hyundai Sonata

Yes, probably, but before you pull off the inner panel, check for broken wires in that rear door opening. You might luck out and find a broken wire for the lock. Then probably won't have to pull the inner panel off.

dose the key turn in the lock you could have a worn door lock where the plastic link bar on the back of the barrel gets a bit worn and just dosnt pull the link bar up enough , you realy need to remove the door pannel and really look at whats happening to the lock from inside the door checking the movement when you turn the key to unlock position you may even take up any play on the link bar to the latch lock by putting a slight bend in the bar to take up the slack

1) Key turns but dose not unlock door. This means that the rod that goes to the back of the lock has came off. This also means that is the reason door is not unlocking with the remote as it pops the lock rod inside the door which pushes the lock open.
2) Key does not turn lock at all but works passengers side door. This means that the locks has been changed in the door, but that doesn't sound like the problem as you say the remote doesn't open the drivers side door so more than likely the rod has came off the back of the lock

If the door lock works ok with a key, I would say the lock actuator is failing. Its a small electric solenoid that moves the lock rod.

I would say that the actuator on the passenger door lock is bad, and tripping the sensor to the switch. I don't think the boot light has anything to do with the door locks. That, I think is another issue.

It may seam extremely complex this problem however its likely vary simple.What you need to do is fine out what works and what dose not . Dose the keyless work on other doors the battery is G or NG. You also mention the remote starter stopped working and D and P position no longer works correctly with the controls /switches in the drivers side door only' not the other doors ..
The control panel for the locks and window switches are on the arm rest drivers door it tends to get wet rain snow window open over time bad connections /switch contact and that is the point you need to look at first . Get some electrical contact cleaner spray into the switches not to much spillage use a tube or it may damage trim materials .
Then use the controls back and forth if you see any improvement of function starts /then stops any change you found the problem .Its in the door.

SOUNDS LIKE BROKEN WIRE IN DOOR JAMB

There is 3 relays in one of the fuse panels that are labeled doorlocks one of them is probably bad. Push the door lock button and find the one that is clicking this is the one that is back. This should fix your problem

Hi abdumi0f,

Firstly, open your glove box and make sure Valet Mode is not enabled, if it is not, follow these steps.

Step 1: Open drivers door and leave open.
Step 2: Lock and unlock the driver’s 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 driver’s 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 twice. ECU responds by locking and unlocking the car doors.
Step 8: Press any button on remote #2 (etc.) twice. 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!

Hope this helps,

Lazaruselite

Hello, It seems as is if you have a remote that will not lock the doors all the time. There can be a couple of reasons that it wont work at times.1 it may have a weak battery,2 there may be some kind of residue inside the key fob itself such as tea,coke,water, or even sweat. This will short the fob out at times.Thank you