Feeling Stupid...new key batteries 996tt - now not working - Page 1 - Porsche General - PistonHeads UK

Bought a 2004 996TT about 5 months ago. Slowly sorting all the niggles out (almost got OPC clean bill of health) so decided to replace the battery in both key fobs.....and now neither work! Guess I will need Porsche to reprogramme them, but until then, how do you open the car without setting the alarm off (and looking a carpark tw@t!) HELP!! At the moment, when I open the car I get abot 20s to put the key in the ignition, if not the alarm goes off. Unfortunately my manual is 200miles away!! many thanks.

Just had a look in my manual and changing the battery notes nothing else other than swapping for a new one. Only other thing I can find is for re-activating a keyfob if the standby function has switched off, which it does if the car has not been opened for over 5 days, so maybe worth a try? Unlock the drivers door with the key and leave the door closed. Then press the lock/unlock button (button 1) on the keyfob and hopefully it will activate it.

There is a Tech Bulletin about keys losing synchronicity when the batteries are changed. I haven't experienced the issue but have given the advice to a few people..... Technical Information 911 Turbo Replacing the remote-control battery (vehicle key) Vehicle Type: 911 Turbo (996) / 911 GT2 (996) Model Year: As of ’01 (1) Concerns: Remote control. Situation: Failure of remote control due to replacing battery improperly. Note: Replacing the battery improperly can cause the processor in the remote control to operate incorrectly so that the remote control no longer functions. For this reason, please inform your customers who would like to purchase a battery for their remote control, to not replace the battery themselves. Replace the battery for the customer as described in the following to avoid a malfunction of the processor and thus a remote control failure. à Procedure page 2, Step 1, "Replacing the remote-control battery" After replacing the battery, check if the remote control functions. If the remote control does not function, the processor could have stopped. If this is the case, the LED of the remote control either does not light when the button is pressed or it lights continuously, i.e., longer than length of time the button is pressed. The processor must be restarted. à Procedure page 3, Step 2, "Restarting the processor" The newly printed editions of the vehicle Driver's Manuals will contain a note that the battery for the remote control should be changed by the Porsche dealer. Tools: Screwdriver (small) Technical Information 19.01.2004 tu9173e © Dr. Ing. h.c. F. Porsche AG Page 2 of 3 Printed in Germany 911 Turbo 99662 E 17/03 After Sales Procedure: 1 Replacing the remote-control battery. 1.1 Take a new battery out of the package and set it aside. 1.2 Removing the battery. Caution! Damage to the processor due to voltage drops or voltage peaks! >Do not press any button of the remote control directly before replacing the battery and during the replacement. 1.2.1 Carefully lift off the cover of the key grip with a finger nail or a small screwdriver. 1.2.2 Unclip battery on the recess of the top of the battery (Figure 1, arrow 1) with a finger nail upwards out of the holder. 1.2.3 Pull out battery from the tab (Figure 1, arrow 2). Bild...Figure...ill...figura...fig 1 1.3 Installing a new battery. Caution! Damage to the processor due to voltage drops or voltage peaks! >When installing the battery, do not press any button on the remote control and avoid repeated c ontact between battery and contact pins. 1.3.1 Slide new battery with the positive terminal upwards under the tab (Figure 1, arrow 2). 1.3.2 Clip new battery downward into the holder. 1.3.3 Put the cover on the key grip. 1.3.4 Press together the key grip and cover tightly until the cover engages audibly. 1.4 Check the function of the remote control. Note: If the remote control does not function after replacing the battery, the processor could have stopped. If this is the case, the LED of the remote control either does not light when the button is pressed or it lights continuously, i.e., longer than length of time the button is pressed. The processor must be restarted. In this case, proceed as is described under Step 2. Technical Information © Dr. Ing. h.c. F. Porsche AG 19.01.2004 tu9173e Printed in Germany Page 3 of 3 911 Turbo 17/03 E 96629 After Sales 2 Restarting the processor. 2.1 Remove battery as described under Step 1.2. 2.2 Inserting battery briefly with polarity reversed. 2.2.1 After a waiting time of at least 10 seconds, slide battery with the polarity of the battery reversed (positive terminal downwards) under the tab (Figure 1, arrow 2). 2.2.2 Clip battery downward into the holder. 2.2.3 After a waiting time of approx. 3 seconds, remove this incorrectly polarized battery again. 2.3 Install battery as described under Step 1.3. 2.4 Check the function of the remote control. See how you get on

^^Interesting. Thanks.

northnoble said: until then, how do you open the car without setting the alarm off (and looking a carpark tw@t!) HELP!! At the moment, when I open the car I get abot 20s to put the key in the ignition, if not the alarm goes off. Is 20 seconds not long enough to put the key in?

monthefish said: Is 20 seconds not long enough to put the key in? Not when you have luggage etc (or piles of work stuff etc)you don't want to put down in the rain (yes it seems to alwats rain here in Scotland!!)

"Pope"...many thanks, will try tomorrow when I am home!!

northnoble said: "Pope"...many thanks, will try tomorrow when I am home!! I'll delete my post then............

Leigh996tt said: I'll delete my post then............ Apologies Leigh996tt...but have tried this already with no joy!!! Have now tried "resetting" the fobs and now one is atleast flashing red but no joy in locking / unlocking the doors!...OPC and lotes of money here i come

Hmmm visit to Porsche Aberdeen and I am now £156 lighter....but have nice new key fob (that works from a good distance) and a new key code!!! Moto of story...don't change your remote battery unless you need to and if you do, be very carefull not to break it!! (Thanks to all that posted help)

£156; I'm smarting for you

Thank you for this thread, ran into problems after changing my fob battery but flipping the battery cell over for 10 seconds solved the problem so a big thumbs up. Why is changing your battery be so hard? It should be the easiest piece of car DIY that anyone could do without instructions.

Many thanks ... worked perfectly and got what appeared to be a dead key fob working perfectly again.

Having this problem on my 02 spec Turbo - nothing I seem to do is fixing it and now alarm is showing both red LEDs flashing as opposed to just one I wonder if it’s the central locking - when I sit in the car and then use the dash button to lock the doors, it clicks a few times after it locks - wonder if this means the lock mechanism is actually the problem

9x6 alarm systems are fairly straightforward; but can be affected by: water ingress - check under the passenger seat for damp. Loose connections - the two plugs on the ecu can work loose; usually after poor refitting during other work. The first things to check: Are there any beeps after locking or unlocking the car? There are specific warning tones emitted that can be used for diagnosis - single beep when locking; door or lid open for example. If you get a double beep when the car is unlocked it suggests a lock synchronicity error - the door locks have switches for locked/unlock and deadlocked - if either of the lock assemblies report a different result you will get a double beep notification from the alarm horn (unless some tricky funster has unplugged it to 'stop the bloody beeping!') If you sit in the car you'll hear the alarm unit doing its thing under the passenger seat; press lock once and you'll hear the central locking 'lock' and the relay click which is the indicator flash actuation; unlock and you'll hear the central locking 'unlock' and more relay clicks as the indicators are flashed to signify the setting. You can disarm the interior monitoring by pressing the lock button twice quickly - press once; then once again - if you did it right the indicators will stay on for 2 seconds instead of flashing. If you get a beep if you try and lock the doors with the drivers door open, the alarm horn is working - if not, check under the cover next to the battery: there is a round metal horn unit attached to a bracket with a two pin plug connected to it - is it plugged in? Yes; horn is likely faulty. No; plug it in and repeat the test........ Single beep when locking with a door or lid open - normal warning - shut the door or lid and repeat Single beep when locking with no door or lid visibly open - something else is triggering the warning; check the glovebox light switch (if you have a glovebox - turbos all do.....) if that is working is there an aftermarket radio fitted?? (the so-called radio contact - fitted to set the alarm off in the event of a radio removal from a locked car with windows open and interior monitoring switched off (they think of everything!)) Double beep after locking (car locks then unlocks automatically) - locking switch fault in door lock (usually passenger side) Double beep after unlocking (car unlocks but horn beeps twice after unlocking) - unlocking switch fault in door lock Come back with how you got on.... Edited by Pope on Friday 1st October 06:19

Thank you for that - I realised something yesterday, which is when I sit in the car and press the central locking button, whilst both doors lock immediately, there is a click click click as if something keeps trying I’m going to try more stuff today and I’ll run through your list - i think this is indeed central locking related and thus the car is ignoring the fobs locking command! Both fobs working properly - I can tell as when you hold the boot release button, the fob LED flashes in groups of three, meaning the CPU in the fob is properly working!

Ahah - bet the click click click is the relay - that might be the fault!