Keyless entry not working, but key fob is good

[bigdo26]

Found inthe B6 A4 forum a way to 're-link' the key fob to the car, but this did not work for me. Is there a way to re-link the key fob to the car for the B5 S4? Or might my issue be something else?

I confirmed earlier today that the key fob is transmitting signal for lock/unlock, so it's not a dead battery there.

[blackhat]

maybe it needs to be resync'd. or.. maybe your central locking pump is dying? try unlocking all your doors with using the key in the door.

[bigdo26]

maybe it needs to be resync'd. or.. maybe your central locking pump is dying? try unlocking all your doors with using the key in the door.

Should have mentioned - I've been using the key in the door to lock/unlock for the past couple months, so that actually works just fine.

Is there a write up on resync'ing the key fob to the car for the B5's? I don't have an owners manual...

[blackhat]

Copied from another thread, Chris@ECSTuning:

This method requires 2 keys.

I'm not sure if you have a working key, if you do you shouldn't need a VAG com. Try this:

1. Take the key you DO NOT want to program and put it in the ignition. Turn it one click forward.
2. Close and lock the drivers door with the second key.
3. On the second key (the one in the drivers door) press the 'UNLOCK' button ONCE only. The lights will flash on the car, but the doors will remain locked
4. With the second key still in the drivers door, unlock then lock the door again.
5. Pull the key from the slot and test remote functions.
6. Open drivers door, remove key from ignition.

If both of your remotes don't work, do the above for the first key, but on step #3, press the 'UNLOCK' button twice. The lights will flash twice, then continue on with step #4. Also, it may be a good idea to do this with the windows down in case you accidentally lock yourself out somehow.

You can program a key with vagcom as well if this fails for whatever reason. For vag com programming: http://www.ross-tech.com/vag-com/car...-matching.html

[bigdo26]

Thanks will give this a try!

[The_Jerbel]

The "antenna" in the rear bumper of the car might also be corroded and no longer receiving the signal very well. You could try the keyless entry extended range mod. Does the keyless entry not work at all, or is it only working from like 2 feet away from the car?

[ashrafnisar]

Mine just did the same thing, and it doesn't work at all, regardless of distance. I will be trying to reprogram today, and thank you for the instructions.

[madman1234509]

With my 02 a6, which this just happened on over the weekend. I had to push either the lock or unlock button once, doesnt matter which one. Then within one minute, put the key in the drivers side door and turn it one way or the other, doesnt matter which way. Worked perfect, its what my owners manual said to do, idk if its the same for the b5. The manual said if the batteries die or if you press the buttons too many times out of range the key might "forget".

[kgoaudi]

Thought I'd report that this method got both my dead keys working but... not at the same time, as yet. I probably did the sequence wrong somewhere and now each time I go to fix one dead key I succeed but kill the one working key. This toggles back and forth repeatedly so I know each key can work properly. Any suggestions? (The user manual has a method for one dead key but that does nothing as far as I can tell.) I so happen to be having some work done by my mechanic today so I asked him to see if he can use his diagnostic computer (or whatever) to reset the dead key I gave him. We'll see... (My bet is he'll get it working with some new security code but, as a result, my working key will have been defeated. Time will tell.)

Copied from another thread, Chris@ECSTuning:

This method requires 2 keys.

I'm not sure if you have a working key, if you do you shouldn't need a VAG com. Try this:

1. Take the key you DO NOT want to program and put it in the ignition. Turn it one click forward.
2. Close and lock the drivers door with the second key.
3. On the second key (the one in the drivers door) press the 'UNLOCK' button ONCE only. The lights will flash on the car, but the doors will remain locked
4. With the second key still in the drivers door, unlock then lock the door again.
5. Pull the key from the slot and test remote functions.
6. Open drivers door, remove key from ignition.

If both of your remotes don't work, do the above for the first key, but on step #3, press the 'UNLOCK' button twice. The lights will flash twice, then continue on with step #4. Also, it may be a good idea to do this with the windows down in case you accidentally lock yourself out somehow.

You can program a key with vagcom as well if this fails for whatever reason. For vag com programming: http://www.ross-tech.com/vag-com/car...-matching.html

[SoCal S4]

This happened to me last week, press and hold the open and close buttons on your key fob at the same time for about 5 seconds, just make sure your standing next to your car when you are doing this.

[Ultrasport05]

Just happened to me too a few days ago. Both remotes stopped working within a week of each other. I replaced the batteries in both and nothing. The remotes were working but the doors wouldn't open. I did the key in driver door method. Insert the key into the driver door and press and hold the unlock button. While still holding in the unlock button, slowly turn the key to the right and lock the doors. It should re-sync the fob to the car. Hope this helps

[Hammerzeit]

This happened to me last week, press and hold the open and close buttons on your key fob at the same time for about 5 seconds, just make sure your standing next to your car when you are doing this.

Did you do this with one key? I only have one key...it died last month, I changed the batteries, tried all kinds of methods for reprogramming...nothin'

[Booboo]

Somewhat same issue. 2009 A4 keyless entry/lock not working. All else works fine on remote. Took car to Audi Dealership in Toronto - found one door sensor was not working, hence causing all doors to malfunction -

Replace sensor, and reprogram key fob for keyless entry == $400 (taxes incl.)

[shanedoink]

This started happening to my wife's 2009 A4 3 days ago. The driver's side will not unlock. All 3 other doors will. :/

I did a test about an hour ago. I locked the car with the fob, then unlocked it. I then pulled the driver's side open and it work. I tried this 3 more times... and failed to open the door all 3 times with the fob.

I sure don't want to pay $400 as you did to have a similar problem "fixed."

[rsxsty1e]

This just happened to me in my b5s4. My remote was fine but the batteries were dead. I replaced the batteries (mine is the fob type that takes 2 small batteries, cr1620 I think) but it still wasn't working. Then I tried putting the key into the driver side door and turned to the left (unlock), and while in that position I clicked the unlock button on the fob and boom - lights blinked twice, it had synced right up. Works great now. This was done with 1 fob, as that's my only key. Hope this works for someone else haha

[hotshot32890]

I just tried that re-programming thing, and the second and third step did not work. Anyone have any other solution?Could maybe be the battery or central locking pump

[oppositelock]

Copied from another thread, Chris@ECSTuning:

This method requires 2 keys.

It works with only one key too. I have only one fob and I've done this successfully. Ignore the parts about the key in the ignition.

[YMI5150?]

tried the one key method - no joy. red light on fob lights up when button is pressed but nothing on the car. mine stopped working after a car stereo installer disconnected the battery for a period of time. i'm pretty certain its a programming issue, just cant find the right method.