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key remote not working on 996 C4


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Just got mine back from repair... I tried everything that was suggested but nothing worked so I brought it to Porsche dealership and they could not tell me what it was... They said they would start by replacing the alarm module... but they were not sure it would fix the pb...

Given the price of the repair I wanted another diagnostic so I went to an import shop who said it was the key... they ordered it, reprogrammed it and it works... cost me 350$ though (The new key is 150 + 110 reprogram + manpower) but they fixed the pb and repaired the gas lock that was stuck the other day...

It is expensive for a key but compared to what Porsche was suggesting it is way less...

Good luck with yours.

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  • 8 months later...

Hi Loren,

thanks for the link. I found a local supplier of the micro switches so I'll go see them tomorrow. I have the same problem that is listed above (light flashes on key fob, can open luggage compartment but not main doors/alarm) is it possible that it's an aerial fault? Car is a 996 MY 2001 and the key fob has two separate buttons.

W

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Hi Loren,

where would I find this article? I've googled site:renntech.org +"excellence magazine" but I can't find it and sadly, we don't appear to get Excellence Magazine in the UK.

W

You can order back issues online at: http://www.excellence-mag.com/back-issues

Has anyone tried the Excellence Mag. repair of replacing the micro switches that fixed the remote other than the author?

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I found them in the U.K. I was hoping to get a part number for everybody. Price is about US$8 for two. The switches that I found were slightly different to the ones fitted to the key but they are being marketed as a suitable replacement. I actually fixed my key with a bit of card... I had all the symptoms - the light flashed when either button was pressed, I could use the second button for opening the luggage compartment, the battery was measured at over 3 volts on my meter. It appears that the battery in the fob was not able to deliver the required voltage to send the signal which I find very odd as it was working the luggage compartment release.

W

post-8149-0-11696700-1295205012_thumb.jp

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  • 2 weeks later...

Update on the switch switch. Installed the new microswitch and left a gap between the bottom of the switch and the track on the circuit board and still have not cured the problem. Battery carrier next.

The trunk release works so can somebody tell me if the luggage compartment (trunk) is separate from the alarm/central locking circuits? If so then I can have a look at the signal reception rather than signal transmission side.

TIA

W

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  • 1 month later...

Update on the switch switch. Installed the new microswitch and left a gap between the bottom of the switch and the track on the circuit board and still have not cured the problem. Battery carrier next.

The trunk release works so can somebody tell me if the luggage compartment (trunk) is separate from the alarm/central locking circuits? If so then I can have a look at the signal reception rather than signal transmission side.

TIA

W

When the remote isn't working --- can you still start the car?

We rebuilt an M96 engine and the 996 was running great for two days -- then one morning it would not start and nor would the FOB remote work

replaced battery -- no joy,

Duramatic gave codes:

23,25, 60 and 42

mike

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Had the same problem with the only key I got when I purchased by 1999 C4. The key just stopped working as a remote, but opened and started the car fine when inserted. Wound up purchasing a new key fob and key from Sunset and had the local dealership cut and program the key. Now I have a remote that works and a second key without a functional remote in case I lose the new key. Have some peace of mind. If the key fob is 10+ years old, spend the money and get a new one. Less headaches.

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I had the exact same problem...

It was a broken solder joint.

Take your key head apart and pull the electronics out.

Look VERY closely at the left and right sides of the momentary contact switch where they are soldered to the PCB.

One side on mine was cracked clean through.

After soldering, it works like a champ.

PLUS ONE ON THAT my friends car had same issue we used PST2 tester to check if key giving out signal it was LED was lighting up as well and turned out to be cracked PCB where the chip is soldered to the board some legs of the chip come away. need electronics specialist car stereo repair shop or some one like that to have a look .

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  • 7 months later...

I wanted to report that I finally got the problem with my remote not working. I ended up having to purchase a new remote fob from Sunset Imports and having my local dealer set it up. The whole thing cost about $300. Worth it to me though. For some reason, the dealer told me the key remote that I had with the car was not supposed to work with my model anyway. Go figure.

Thanks for everyone's help.

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  • 1 year later...

I just bought my 996 last Friday and it only had one key and the remote does not unlock or lock the doors I can use the key. I see the light blink when I hit the button, but unlike my friends when he unlock the car his blinks rapidly not just one blink.

What shops are you guys taking the car to get the key programed? I called a shop in Miami and they said it can only be the dealer I called the dealer and they want $600 for a new key.

So far I have done the following. I replaced the battery – I put the battery in backwards – started the car and hit the lock unlock button. I’m going to try to remove the cars battery and check the fuse on the control box under the seat.

Edited by 99699
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  • 1 year later...

Was doing some research on my same issue and came about this thread.  Just though I'd post that, after having mine work very intermittently recently (worked 25% of the time?), I took it apart, pulled the battery, unsoldered the battery case, retouched all the solder joints with just tiny bit of flux and solder, and now it's back to working beautifully again.  Took about 5 minutes.  (Note that I'm an experienced solderer and have a fine tip on my iron for small parts like that.).  I bet this is the problem with many of them.

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  • 5 years later...

My remote has not worked since I bought the car  about 2 months ago. When I changed the battery I noticed that the small printed circuit board in the key head was not seated properly.

It should snap into the cover(small side) and stay put. I then put the head back together and it's been working since then.

Good luck.

Paul

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