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Central Locking with PA 1000 Not Working! - *Solution Added*

richbrowne

richbrowne

New member
Hi,
I have had my 993 in storage for the past 8 weeks with the battery being topped up using a well known battery conditioned. In addition, the alarm was on all the time with the front lid open to allow the charging cable through; I had 'dropped the latch' on the front compartment so that the alarm would perceive the bonnet as being closed. I went to check it over a couple of weeks ago, spun the engine over without DME installed to circulate the oil and then fired it up with the DME installed and all was okay.

Incidentally, I took the opportunity to replace the DME with a brand new one with the '993' part number while I was doing this.

I should also say that previous to this issue the central locking has always worked fine and has never seemed 'strained' in any way.

Today I went to bring the car out of storage and the following happened:

I took the bonnet 'off the latch' so that it could be closed and the alarm fired up. This was as expected as I had forgotten to turn the alarm off. However, when I did turn the alarm off the central locking never unlocked the doors.

I then switched the alarm back on and then off again. Throughout all this the indicators register the alarm being enabled and disabled yet the central locking did not work.

I tried multiple times switching the alarm on and then off and at no time would the central locking even try to work to either lock or unlock the car.

In the end I had to unlock the drivers door with the key. I then started the car with no problems and drove it the very short distance back to my house.

Having driven the car back the central locking still never worked, yet the alarm registers the arming and disarming through the indicator lights as expected.

I checked all the fuses under the front lid and rear lid compartments (compartments with black covers) and could not see a fuse listed for the central locking, which I thought bizarre.

To help with a diagnosis, I have noted the following additional issues alongside the failing central locking:

1) The bonnet courtesy light does not come on when the bonnet is opened.

2) The door courtesy light switches (automatically supposed to switch on the interior lights) do not switch on the interior lights, yet the lights work if I manually push the lights to the 'on' stage inside the car.

All this seems to point to a simple blown fuse yet I cannot see one listed in the manual or on the fuse compartment lid.


Can anyone help me resolve this painful issue please?

Many thanks for any help you can provide.


Richard.
 
So it was all working fine after you swapped the DME relay 2 weeks ago? If you are not sure, I'd be tempted to swap them back for a quick check. Like you say, it sounds like a fuse, Does the "door lock" button on the central console work?
 
Hi Mark, I am pretty sure that I changed the DME relay After the Central Locking failed; in any event the DME was changed yesterday. It was on my 'To Do' list as the old one had the 964 part number. I shall try the old one anyway just in case. The interior Central Locking button does Not work but all the other centre console switches do work. This really is quite bizarre; the front compartment and interior lights do not work off their courtesy switches yet the interior lights work when Manually switched on. I would swear this all points to a failing fuse somewhere but I do not know of one that controls these circuits? In addition, the Central Locking red LED lights on the doors no longer work. Thanks for your help. Richard.
 
Hi Mark, Just to confirm that I have now replaced the DME with the old version and no joy, the same issues still exist. Richard.
 
Richard, I've just had a look in Adrian Streather's book and (like you have seen in the fuses boxes) there is no reference to a fuse for the central locking - which seems very odd given that some very minor things do have their own fuses. However he does say that Relay 61 (back of luggage compartment fuse box, in the corner nearest the side of the car) is used for "country specific" immobiliser/central locking systems. Perhaps it's been knock? Worth a fiddle! However (just done some more reading!).... Diagnostics for "Alarm and Central Locking": "Doors will not lock with central locking" - solutions suggested: Fuse 18 Blown Alarm control unit failed Door locking actuators failed Good luck!
 
Hi Mark, thank you for all your efforts, much appreciated. I have tried as you suggested; there is not relay 61 in the front compartment; I guess this is not for the UK market. Also, fuse 18 is okay. I also had a look under the steering column as I remember looking at the alarm some time ago and there are three fuses under the dash for the PA 1000. Alas, all these are okay too. I have also checked the front compartment and door switches by seeing if they actuate the alarm; they all do so no issues with the switches or the sensing system. I'm beginning to think that the main board has gone on the PA1000. I shall speak to Hamilton & Palmer next week and see what they say. I can replace this myself if I have to; just a lot of hassle! Thanks again. Richard.
 
Rich, I had a similar problem a while back with pa2000 alarm. I rang H & Palmer, they went through afew checks & in the end had to take the board out & send to them for reprogramming with key fobs. They had it all reprogrammed and back again in 2days i think. They were very quick. Hope you get yours sorted soon. Stu
 
Hi, I have now resolved this issue and am providing this post as insight for others should they have the same problem. The clue to resolving the issue was the fact that the Comfort system was affected too. In the end it was the original Porsche fit Alarm/Central Locking unit situated under the drivers seat that was at fault. This unit has the 'nickname' of the 'EZ900' unit and has the following part number: 928 618 260 .03. Unfortunately the unit is branded as the Porsche alarm, which threw me until I spoke with Gert Carnewal, a specialist at Hamilton & Palmer (they used to provide Thatcham compliant PA series alarms for the 993 and know about the general electronics of the cars) and a Porsche mechanic/engineer at a local OPC and they pointed me in the right direction. A friend procured a new unit from Euro Car Parts (http://www.eurocarparts.com/) at a price better than elsewhere (£190 +VAT). Apparently these units fail every now and again and give no warning; one minute they work, the next they don't. I replaced the unit (remove driver's seat, undo one securing nut, unplug old unit, plug in new unit etc) and low and behold all was well again. I would recommend that anyone with similar issues is fairly sure that it is this unit that is at fault given the unit's price. I was 99% sure following my research but it was still a bit of a 'leap of faith' to invest in a new one. Hope this helps others with similar issues. Richard.
 
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