got lucky and fixed my ignition key yesterday

[rfuerst911sc]

Originally Posted by Anker

I wonder whether this is the way you pair any key with your car?

Anker

There is no way you can pair " any key " using this method. This method only works ( to my knowledge ) for a key that has already worked in the past with the immobilizer .

[papasmurf]

My keyless entry quit working about a month ago and none of the hacks so far have been successful. The light on the key blinks and I replaced the battery once just in case but that did not prove to be the problem either...very frustrating and no way am I going to pay big bucks to the dealer to replace the key and/or resync it.

[jakeru]

Originally Posted by papasmurf

My keyless entry quit working about a month ago and none of the hacks so far have been successful. The light on the key blinks and I replaced the battery once just in case but that did not prove to be the problem either...very frustrating and no way am I going to pay big bucks to the dealer to replace the key and/or resync it.

Lazy blink or quick blink?

If a "lazy blinking" key won't work, I have no solution (and if someone figures out one, I also want to know).

But if "quick blinking" key won't work, try removing board from key case, desoldering coin cell battery holder from board, reflowing board solder joints (some previously covered by the battery holder), reinstalling the battery holder and battery, and reassembling. Apparently the solder connection gets unreliable. If you need to press the key really hard or have intermittent function (unreliable operation), this could also indicate the board solder joints need reflowing.

[papasmurf]

from the key fob that I am getting. I have never had a problem with the button being intermittent in the way it works...possibly the range seems decreased as the battery has aged but that is about all.

[jakeru]

Originally Posted by papasmurf

from the key fob that I am getting. I have never had a problem with the button being intermittent in the way it works...possibly the range seems decreased as the battery has aged but that is about all.

Quick blink is good! So, your keyfob blinking light works reliably, but the locking/unlocking action just does not work reliably - correct? If that is the case, your key is a perfect candidate for the solder reflowing procedure I described above!

One word of warning: the components are surface-mount (not through-hole), so you'll need a fairly small/precise soldering iron to access all the solder joints without inadvertently melting the components.