scarface1928

Hi All.

I am new here so please be gentle

I have spent the past few days searching forums etc for help but not managed to sort my issue yet.

My 1999 2.5 boxster has the following issues:

1) car will not lock or unlock from keyfob.
2)When I use the key to lock it only the drivers door locks and the alarm beeps twice.
3) neither window is working (up or down) although the auto drop works from both the interior and exterior handles.
4) whilst the roof works fine the windows do not auto drop when the hood goes up and down.

I had the car fault checked and it showed:

Passenger - side release stuck
Passenger compartments monitoring sensor.
control locking syncronization.
central locking limit position lock not reached
wlead (dme immobiliser)
Terminal 86 not detected.

So far I have:

checked the fuses in fuse box.
Checked the fuse in the box under the passenger seat.
when I press the key fob I can hear the solenoid in the central locking unit under the seat clicking.
checked the roof microswitch is working with ohm meter.
checked passenger internal and ext door microswitches.

I am about to swap the pass door lock but wondered if anyone had any other ideas?

Thanks on advanve

Steve

jerry1847

I have the exact same issues. I'm replacing the door lock and window regulator on the passenger side and hopefully it helps.

Macster

What Jerry1847 said.

If you are going to throw parts at the behavior the passenger side door lock assembly/controller would be a start.

I assume the cabin floor is dry? No signs of any moisture at the security module?

Are the door bottoms dry? Any signs of water on the dry side of the doors, either there now, or having been there?

Be sure the door membranes are completely sealed and not torn or split. The membranes in my 2002 just failed due to age and had to be replaced. After a bit of rain the door bottom carpets were moist before the membranes were replaced. Afterwards the car sat out in some of the heaviest rain we've had here in northern CA in some years and remained totally dry.

scarface1928

Thanks for the reply.
everything seems dry.
i have checked the connector in the a-pillar and it is dry with no visible corrosion.
today I swapped the passanger door lock and it has made no difference.

could it be due to the central locking module under the passenger seat?

any other ideas?
Thanks all.

steve

Macster

It is possible the security module under the seat is bad. Generally when one goes bad it goes bad due to water in the cabin but like any electronic device it can fail without any help from moisture.

An outright failure is rare but of course that doesn't mean it hasn't occurred.

I am not qualified to make a call as to what the errors mean. Throwing a new (or possibly a used) security module at the behavior is not easy or inexpensive. As an aside the less handling the security module gets the better. As just a big old computer chip -- so to speak -- it is very much at risk of being ruined by a static discharge. Also it is old and a connector pin or socket can break and possibly render a perfectly good security module (or the socket/connector into which it plugs) bad.

Certainly if it is necessary to replace the security module it is necessary but you want to be sure.

A Porsche tech with access to a Porsche diagnostic computer and all the info he has access to (the security alarm error code reference) and training and experience he has is probably necessary to interpret the meaning of the errors and pinpoint what is wrong.

scarface1928

Thanks. Did a bit more testing today.
im pretty sure it is the module under the seat.
just got to decide if I should bite the bullet and mend it or sell it as it is.

ill do some more research tonight and call my local Porsche specialist .
tganks