Keyless entry - Fob off !

Keyless entry - Fob off !

Author
Discussion

Skullbiker

Original Poster:

5 posts

84 months

Tuesday 3rd October 2017
quotequote all
My key works fine once in the car.
The central locking switch on the dash works .
The remote from the key fob will not lock/unlock the car and the front and rear boots buttons also do nothing. The LED's do flash but nothing unlocks.
This key fob has worked fine until about 10 days ago. I have put a new battery cell in and it flashes on all buttons.

On the top of the dashboard in car the Alarm LED is now flashing every 2 secs when the car is locked and alarm on but when I try to unlock the vehicle with the fob still nothing happening .

Any suggestions please ?

Bennachie

1,090 posts

153 months

Tuesday 3rd October 2017
quotequote all
Re-synch car with fob. In't manual somewhere....

kev.RS

215 posts

209 months

Tuesday 3rd October 2017
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Is it for the 986 boxster in your profile?
If so then you could try de-polarising it by putting the battery the wrong way over and then swapping it back as that has worked once but they are common to loose their coding and will need a new key head from Porsche and for them to code it for about half an hour and can keep your original blade.
They also don’t need any power in the key to start it.

If it was a 997 then they are a lot easier to resync.

ajondyh

686 posts

126 months

Tuesday 3rd October 2017
quotequote all
A common problem on these is the solder joints deteriorating. If you are good at soldering electronic components, desolder and remove the plastic battery carrier and resolder/reflow all surface mount components on the circuit board. Re solder the carrier and it should work again. It may need a re sync as you have already mentioned. HTH Andy

AW10

4,447 posts

251 months

Wednesday 4th October 2017
quotequote all
kev.RS said:
If so then you could try de-polarising it by putting the battery the wrong way over and then swapping it back
Surprised that works - I would have expected that to fry the electronics in the fob.

cuprabob

14,882 posts

216 months

Wednesday 4th October 2017
quotequote all
AW10 said:
kev.RS said:
If so then you could try de-polarising it by putting the battery the wrong way over and then swapping it back
Surprised that works - I would have expected that to fry the electronics in the fob.
Most battery powered circuits use a diode to.protect from reverse polarity due to the battery being put in the wrong way round.

kev.RS

215 posts

209 months

Wednesday 4th October 2017
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It was just something that someone said to me years ago and only ever worked once but could have just been chance!

Rockster

1,510 posts

162 months

Thursday 5th October 2017
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kev.RS said:
It was just something that someone said to me years ago and only ever worked once but could have just been chance!
Don't know when or where I first learned of putting the battery in backwards but I've done it several times with success.