996 lock unlock issues

[maor]

Having issues with key fob.

I'll go for a drive, unlock the car with the fob. Go for a drive and get to my destination, get out shut the door and I wont be able to lock the car. If I go into the car and shut the door then It will let me lock it all of a sudden. Or if I leave the car unlocked and walk off and come back 10 mins ill be able to lock it straightaway.

I send the key to be looked at, microswitches were fine and some bits got soldered but it's made no difference. Battery was changed too.

When I can't lock the car, the red light is flashing on the remote but on the car the red light isn't flashing. Obviously when it is working both red lights are flashing as they should.

So I think I can rule out the remote being the issue. What else could cause this? I can't see anything else that is consistent.

[Loren]

Any beeps when locking?

One beep means one (or more) alarm zone is open -- two beeps means there is a fault in the alarm system,

[maor]

No beeps at all

[Loren]

Try a reset by reversing the battery for a few seconds.

Do you have another remote? If so, does it act the same way?

[Richard Hamilton]

Try a reset by reversing the battery for a few seconds.

The battery in the key - not the car battery! ;)

[maor]

Tried reverse battery and a new battery.

Only have 1 key

Pretty confusing situation tbh.

[Loren]

Might be time to just buy a new Design key.

About $100 - then just transfer your key blade and immobilizer pill to the new key head.

[maor]

Sorry I tried switching to a new case, same design but the actual case is new

Still the same issue.

[Richard Hamilton]

I think you will need to get it hooked up to a Porsche PST2 or PIWIS tester to be able to diagnose it properly. It would enable you to see if the alarm control unit is recognising the remote signal, and you can also check the other inputs to the system to see what isn't functioining correctly.

It isn't damp under the left hand (passenger) seat by any chance?

If you are anywhere near me, I'd be happy to run the tests for you.

[Ronnie38]

Check the module under the drivers seat for corrosion on the connectors. It could be the problem if it ever got wet even with carpet cleaning. this module is the alarm, auto window controls, lock conrols and immobilizer cpu

[Richard Hamilton]

Passenger seat on the OP's right hand drive car.

[maor]

Still haven't looked into this further due to time of year but I found something interesting yesterday.

Got out the car and couldn't lock it, red light on dash was doing nothing, key was flashing red.

I immediately opened the door and the car red light and key red light began talking. Shut the door and again, unresponsive. Opened the door and responsive.

What on earth could cause that?