phazed Posted November 21, 2023 Report Share Posted November 21, 2023 I’ve got to the stage where I have to remove the rear suspension units. Top mounts are underneath the roof clam. Roof won’t go down and windows don’t work from the door switches . Checked the roof micro switch above the mirror, only one switch fitted, all okay. Also checked handbrake micro switch, all ok. Sometimes when I try to operate the roof the windows will drop the usual 1/2” and go back up. Looking on YouTube, on a similar 986 on the fuse board (it was an American model). The fuse board had a double width relay that operated the roof. My fuse board hasn’t got this double relay. Not yet checked any fuses, but that will be next on the list of simple checks. I am assuming that the cars with a double micro switch by the roof handle have the double relay on the fuse board and mine is different, possibly a later example. I know my ignition switch is dodgy, new one on order. Car did have water in sometime ago and allegedly compromised the immobiliser under the pax seat. When the car was at a main dealer, (previous owner) they dried it out and the car started. Question: is it just the immobiliser under the seat? Also, central locking doesn’t seem to work from the fobs, (new batteries fitted). Drivers door will not open from outside but will open from the inside. Apart from all that, things are practically Rosy! any advice will be greatly received. Thanks guys. Quote Link to comment Share on other sites More sharing options...
TV8 Posted November 21, 2023 Report Share Posted November 21, 2023 The handbrake is definitely on when you are trying this? Quote Link to comment Share on other sites More sharing options...
phazed Posted November 21, 2023 Author Report Share Posted November 21, 2023 Actually bridged switch and no go.. Quote Link to comment Share on other sites More sharing options...
phazed Posted November 21, 2023 Author Report Share Posted November 21, 2023 Also, handbrake light is on whether brake on or off. Quote Link to comment Share on other sites More sharing options...
Paul P Posted November 21, 2023 Report Share Posted November 21, 2023 Another approach to get the roof down - not a fix but a way to let you get to the bits you need? Quote Link to comment Share on other sites More sharing options...
phazed Posted November 21, 2023 Author Report Share Posted November 21, 2023 Thanks for that. I might well do that so I can complete other areas of work. I don’t understand why my parking brake warning light is on, on the dashboard, whether the switch is connected or disconnected, strange. Quote Link to comment Share on other sites More sharing options...
Daboy3000 Posted November 21, 2023 Report Share Posted November 21, 2023 I think you have a dodgy module under the passengers seat, can cause many of these symptoms. Quote Link to comment Share on other sites More sharing options...
phazed Posted November 21, 2023 Author Report Share Posted November 21, 2023 Can someone tell me exactly what that module does? Someone told me it was just the immobilizer. I had the same thing happen, (lack of roof, windows, and spoiler, not working.) to a 987.1 that passed through my hands earlier this year. That had that module soaked and spoiler, roof and windows did not operate. Renewed the module, had it programmed in and Bob’s your uncle! I can’t believe that module, the size of it under the passenger seat is just for the immobilizer. Just to reiterate, mine is a 2002 model. Just a theory, maybe it is an immobilizer for the earlier models with two micro switches in the overhead switch unit and the double size relay in the fuse box. Maybe mine being a later car is similar to the 987.1. Quote Link to comment Share on other sites More sharing options...
Paul P Posted November 21, 2023 Report Share Posted November 21, 2023 On a 986 it’s the alarm and immobiliser. I don’t think the 986 has a module for the roof as such. on a 987 it’s the rear control unit and separately the reverse sensor control. Rear control unit does roof , spoiler , boot latch and light, brake and rear lights. Quote Link to comment Share on other sites More sharing options...
phazed Posted November 21, 2023 Author Report Share Posted November 21, 2023 Thanks for that. Tomorrow I will check everything that is working or not working on the car. Best I can. Previous owner stated that boot releases did not work, as well as spoiler, windows, and roof. He also said it wouldn’t start before he put it into a Porsche dealership that allegedly dried out the under seat unit and got the car started. I bought the car in this condition so I don’t know too much about it. Everything caused by the usual completely blocked drains! Quote Link to comment Share on other sites More sharing options...
½cwt Posted November 21, 2023 Report Share Posted November 21, 2023 There is no roof 'module' in the 986, just the big relay in the fuse panel and the network of microswitches in the latch, hand brake etc. Module under the seat on left side is the alarm/immobiliser and a few sub systems like interior lights and sun visor vanity lights. In many respect this is much more critical than the rear control module that sits in the same location in the 987, if it has taken a bath at any time it can spell trouble. Mine had got wet and the corrosion on the circuit board was significant, however I lucked in as the only damaged circuit was the interior light/vanity lights and I was able to by-pass with a local live feed to get them working again. The other 4 (IIRC) circuits were OK so no replacement module required. @phazed what have you got in the way of manuals and circuit diagrams? I might be able to help a bit more if you PM me. Quote Link to comment Share on other sites More sharing options...
phazed Posted November 21, 2023 Author Report Share Posted November 21, 2023 (edited) Absolutely, none! Only previous information that you have sent to me. Edited November 21, 2023 by phazed Quote Link to comment Share on other sites More sharing options...
½cwt Posted November 22, 2023 Report Share Posted November 22, 2023 Could be a painstaking plod through the wiring diagrams then... Can't remember what year your car is but for up to 2000 it is Sheet 7 page 104 onwards, for 2001 onwards it is Sheet 6 page 113 of the circuit diagrams which will take you through the roof electrical components and where they are linked to. Quote Link to comment Share on other sites More sharing options...
phazed Posted November 22, 2023 Author Report Share Posted November 22, 2023 (edited) A 2002 car. I will have a look through the information you sent me previously a little later. Work put on hold as I have severely strained my back recently which is really p*ssing me off! Edited November 22, 2023 by phazed Quote Link to comment Share on other sites More sharing options...
Happy Days Posted November 22, 2023 Report Share Posted November 22, 2023 1 minute ago, phazed said: A 2002 car. I will have a look through the information you sent me previously a little later. Work put on hold as I have severely strained my back recently which is really p*ssing me off! You need to put that on the 'what p*ssed you off today' thread. Quote Link to comment Share on other sites More sharing options...
½cwt Posted November 22, 2023 Report Share Posted November 22, 2023 Just now, phazed said: A 2002 car. I will have a look through the information you sent me previously a little later. A 2002 car. I will have a look through the information you sent me previously a little later. Work put on hold as I have severely strained my back recently which is really p*ssing me off! You can still study the diagrams. 😉 They do take a bit of time to get your head around them, rather like the finer details of the parts catalogue. Quote Link to comment Share on other sites More sharing options...
Menoporsche Posted November 22, 2023 Report Share Posted November 22, 2023 What p*ssed you off - strained my back What cheered you up - got more time to study wiring diagrams What p*ssed you off - these diagrams are impossible .....could keep giving... Reminds me of the Fortunately /Unfortunately games we used to play as a kid. Quote Link to comment Share on other sites More sharing options...
½cwt Posted November 22, 2023 Report Share Posted November 22, 2023 4 hours ago, Menoporsche said: What p*ssed you off - strained my back What cheered you up - got more time to study wiring diagrams What p*ssed you off - these diagrams are impossible .....could keep giving... Reminds me of the Fortunately /Unfortunately games we used to play as a kid. Not impossible; a simpleton like me can eventually get to the bottom of them. Quote Link to comment Share on other sites More sharing options...
Menoporsche Posted November 22, 2023 Report Share Posted November 22, 2023 40 minutes ago, ½cwt said: What cheered you up; a simpleton like me can eventually get to the bottom of them. C'mon, play the game properly... Quote Link to comment Share on other sites More sharing options...
phazed Posted November 22, 2023 Author Report Share Posted November 22, 2023 Just had a price from my Porsche parts mate, who quoted somewhere in between eight and 900 pounds-ish for a new immobilizer if they are available! Just had a price from my Porsche parts mate, who quoted somewhere in between 8-900 pounds-ish for a new immobilizer if they are available! Well, make love to my old Wellington’s! Quote Link to comment Share on other sites More sharing options...
½cwt Posted November 22, 2023 Report Share Posted November 22, 2023 21 minutes ago, phazed said: Just had a price from my Porsche parts mate, who quoted somewhere in between eight and 900 pounds-ish for a new immobilizer if they are available! Just had a price from my Porsche parts mate, who quoted somewhere in between 8-900 pounds-ish for a new immobilizer if they are available! Well, make love to my old Wellington’s! There is an option, fiddly but probably cheaper. If it is going to be a track car and security isn't an issue, you could work around the whole alarm/immobiliser system to make it redundant. Quote Link to comment Share on other sites More sharing options...
phazed Posted November 22, 2023 Author Report Share Posted November 22, 2023 Just removed two units from under the pax seat. The smaller one with a multi pin connector I guess is the immobilizer. The other one has two large multi pin connectors, and to me. This looks very similar to the one that is under the seat of my 987.1. Haven’t looked at the wiring diagrams yet, but hopefully this will shed some light on the subject. I would have thought that someone here may know the definitive answer what this larger ECU is for. ??? Quote Link to comment Share on other sites More sharing options...
½cwt Posted November 22, 2023 Report Share Posted November 22, 2023 One will have M534 or M535 marked on it. This is the alarm/immobiliser control unit. Open it up and hope not to find lots of white and green corrosion.... Quote Link to comment Share on other sites More sharing options...
Menoporsche Posted November 22, 2023 Report Share Posted November 22, 2023 2 hours ago, phazed said: Just had a price from my Porsche parts mate, who quoted somewhere in between 8-900 pounds-ish for a new immobilizer if they are available! I recall quotes here of 600 all in, possibly used from breaker, but also labour and recoding of stuff accordingly. Quote Link to comment Share on other sites More sharing options...
½cwt Posted November 22, 2023 Report Share Posted November 22, 2023 (edited) 31 minutes ago, Menoporsche said: I recall quotes here of 600 all in, possibly used from breaker, but also labour and recoding of stuff accordingly. One of those jobs that's worth getting an OPC to do once you have registered the car as a Classic Porsche (15% off parts they fit) as its not only a specialist Porsche part but also coding is involved. Edited November 22, 2023 by ½cwt Quote Link to comment Share on other sites More sharing options...
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