Craigmann36 Posted February 15 Report Share Posted February 15 Hi folks, Before people jump to the understandable conclusion, the rear control unit 100% did not get wet! Long story short; - Trickle charger faulty - Battery died - Car started after battery was charged - All/most systems operating via the rear control unit aren’t working (spoiler stuck “up”, boot doesn’t recognise it’s closed, roof doesn’t recognise it is closed) The rear control unit 100% did not get wet. The vehicle is dry stored, and prior to this, it worked completely fine, and the drain plugs are checked regularly. I believe the rear control module needs reset. I sadly live in Aberdeen, Scotland with no specialists near me. Does anyone know if this can be done remotely? Any suggestions for a fix welcome. Also suggestions of any garages near me who can fix, is also appreciated. Many Thanks Quote Link to comment Share on other sites More sharing options...
The Caped Crusader Posted February 15 Report Share Posted February 15 Are you sure it doesn't need a 'vehicle handover' procedure carried out using PIWIS? Quote Link to comment Share on other sites More sharing options...
Craigmann36 Posted February 15 Author Report Share Posted February 15 Thanks! My thoughts also. But how do I go about doing so? Quote Link to comment Share on other sites More sharing options...
iborguk Posted February 16 Report Share Posted February 16 (edited) 8 hours ago, Craigmann36 said: Thanks! My thoughts also. But how do I go about doing so? All roads lead to get the car in front of someone with Porsche PIWIS to diagnose and if required re-code/do the handover. Porsche Centre Aberdeen will be able to do that if you have no Indys near you with PIWIS. Edited February 16 by iborguk Quote Link to comment Share on other sites More sharing options...
½cwt Posted February 16 Report Share Posted February 16 No remote option. Also, I know you put it int the text of your post, but can you put your location in your profile? I was about to recommend someone near Maidenhead to help you, just the 500 miles or so away.... Quote Link to comment Share on other sites More sharing options...
Mattman42 Posted February 16 Report Share Posted February 16 1 minute ago, ½cwt said: No remote option. Also, I know you put it int the text of your post, but can you put your location in your profile? I was about to recommend someone near Maidenhead to help you, just the 500 miles or so away.... But would you walk 500 miles, and would you walk 500 more? sorry - I’ll get my coat Quote Link to comment Share on other sites More sharing options...
½cwt Posted February 16 Report Share Posted February 16 (edited) I'll set 'em up, you put 'em in the back of the net... Anyway, rear control unit, he could still drive. Apologies to the OP for some hi-jacking humour. Edited February 16 by ½cwt Quote Link to comment Share on other sites More sharing options...
Paul P Posted February 16 Report Share Posted February 16 (edited) These folks supply "ready coded" units and it looks like they will recode if you send them the unit..... https://www.mdbdiagnostics.co.uk/product-page/porsche-987-gen-1-rear-body-control-module-re-coding-programming-service ...but its not a normal failure state - and whilst on the face of it what you say makes sense - you may find that there's a different issue. The handover reset may be required - that's a PIWIS plugged into car job - but suggest a call to the guys listed and get their view. Edited February 16 by Paul P Quote Link to comment Share on other sites More sharing options...
The Caped Crusader Posted February 16 Report Share Posted February 16 13 hours ago, Craigmann36 said: Thanks! My thoughts also. But how do I go about doing so? You need someone with PIWIS. Are there no independents near you that could do this? It's a ten minute job! Quote Link to comment Share on other sites More sharing options...
phazed Posted February 16 Report Share Posted February 16 When I needed my new under the seat control unit programmed into the car I took it to it an independent who did it while I waited for 50 pounds. Of course you may have another issue that needs looking at. Quote Link to comment Share on other sites More sharing options...
Paul P Posted February 16 Report Share Posted February 16 Thinking out loud and please take this as "random bloke on an internet forum reckons......" I just had a look at the generally available coding options for the rear control unit - there aren't many... spoiler is one of them, as is "roof mechanism new type" and "vehicle type" - I have tweaked them for folks on cars when they have replaced the rear unit - but there's nothing in there for "boot closed detection" or "roof closed detection" - they are just things that the rear unit does - so, whilst I hear you that the rear unit hasn't got wet - this is presenting ( at least via internet diagnosis) as "fault" rather then "lost it's mind". It has been known for rear units that have previously had a drink to fail down the line..... So - here's my 2p worth - there's no software "reboot" for the rcu in PIWIS ( some modules have a "reset", not the RCU), so in the 1st instance - pop the bonnet (and stick a rag in the latch - just so you dont close it by accident) - disconnect the battery for 15 mins or so, then reconnect the battery. You will likely get the usual "PSM" and possibly drive off assist errors - a run around the block clears those, and you will need to reset windows top and bottom ( open the window all the way, let go of the switch, then operate it open again and hold for 5 seconds, then repeat for closed, and for the other side). If that doesn't change the state of play with the RCU - then i suggest pulling the unit, and having a look inside to see if there's any historic signs of corrosion - give the connectors a clean with contact cleaner while you are there. If no progress, then as others have said - it needs to get plugged into something with Porsche smarts for some diags ( PIWIS, Durametric, ICARSOFT, Foxwell VT530 or similar). PIWIS for preference since that can run the handover reset which is worth a try. Hope it's just a product of what happened and can be chased away .... @Richard Hamilton any thoughts? Quote Link to comment Share on other sites More sharing options...
Craigmann36 Posted March 20 Author Report Share Posted March 20 Thanks for all the help folks, These are the remaining codes when I clear the ones of no concern; 8004 8005 8006 These relate to fuses A3 and A7 I am told. Fuses are both fine and I am now stumped… I am useless electrically, it is fair to say. Any further advice greatly appreciated! Quote Link to comment Share on other sites More sharing options...
Paul P Posted March 20 Report Share Posted March 20 13 hours ago, Craigmann36 said: Thanks for all the help folks, These are the remaining codes when I clear the ones of no concern; 8004 8005 8006 These relate to fuses A3 and A7 I am told. Fuses are both fine and I am now stumped… I am useless electrically, it is fair to say. Any further advice greatly appreciated! What modules are reporting those codes ? Only reference I see (so far) to those numbers is the PCM ( headunit) - and they translate to 8004 - GSM antenna (phone) broken or shorted out, 8005 / 8006 - Satellite receiver error ( I assume related to US cars with satellite radio)... - phone unit is under the drivers seat ( UK car) - so possibly something going on there? Your original problem was spoiler, boot and roof stuff - what happened/got fixed/went away between then and now - are those things still an issue? Quote Link to comment Share on other sites More sharing options...
Menoporsche Posted March 20 Report Share Posted March 20 You finally finished walking then? Quote Link to comment Share on other sites More sharing options...
Craigmann36 Posted April 2 Author Report Share Posted April 2 On 3/20/2024 at 1:46 PM, Paul P said: What modules are reporting those codes ? Only reference I see (so far) to those numbers is the PCM ( headunit) - and they translate to 8004 - GSM antenna (phone) broken or shorted out, 8005 / 8006 - Satellite receiver error ( I assume related to US cars with satellite radio)... - phone unit is under the drivers seat ( UK car) - so possibly something going on there? Your original problem was spoiler, boot and roof stuff - what happened/got fixed/went away between then and now - are those things still an issue? Thanks Paul, All the other issues remain present unfortunately! Thanks! Quote Link to comment Share on other sites More sharing options...
Paul P Posted April 3 Report Share Posted April 3 What are you reading the codes with ? And does the reference to PCM make any sense - do you have a replacement head unit. ? Quote Link to comment Share on other sites More sharing options...
Craigmann36 Posted April 6 Author Report Share Posted April 6 On 4/3/2024 at 7:49 AM, Paul P said: What are you reading the codes with ? And does the reference to PCM make any sense - do you have a replacement head unit. ? I have been reading with a foxwell I have been given by my local garage. I do have an aftermarket unit in which is rubbish. Got a (much better) replacement getting fitted by a professional on Thursday to see if this helps. In the meantime I had taken every fuse out, laid in order and then replaced each of them in their respective place. Car was fine from Thursday-today when all issues returned… Quote Link to comment Share on other sites More sharing options...
iborguk Posted April 6 Report Share Posted April 6 15 minutes ago, Craigmann36 said: Car was fine from Thursday-today when all issues returned… The issues being the return of codes 8004, 8005 and 8006 or do you mean something else ? I'll wager the PCM wasn't coded out out the car with a Porsche PIWIS when the head unit was replaced. Quote Link to comment Share on other sites More sharing options...
Craigmann36 Posted April 22 Author Report Share Posted April 22 New unit in, PCM coded out, no difference. I think next step will be get a new/used Rear Control Unit recoded to my vehicle, and if it isn’t that I’m then stumped and it’s time to take it to someone who does this for a living. the issue being, there’s no one near me who does such a thing… Quote Link to comment Share on other sites More sharing options...
iborguk Posted April 22 Report Share Posted April 22 44 minutes ago, Craigmann36 said: there’s no one near me who does such a thing… location ? Quote Link to comment Share on other sites More sharing options...
Paul P Posted April 22 Report Share Posted April 22 These guys sell new coded to your spec units. They may also be able to test yours. Worth a call? https://www.mdbdiagnostics.co.uk 1 Quote Link to comment Share on other sites More sharing options...
Craigmann36 Posted April 22 Author Report Share Posted April 22 8 hours ago, iborguk said: location ? Aberdeen. My best bet is likely an auto electrician Quote Link to comment Share on other sites More sharing options...
Craigmann36 Posted April 22 Author Report Share Posted April 22 My current thinking is along the lines that the Rear Control Unit cannot be faulty, given it worked fine for 3 days after taking out all the fuses. Further, something is draining power from the vehicle causing the battery to go flat. Whatever this is, could be causing no power to the rear control unit. I am though by no means electrically minded. Infact I’m electrically inept. I’ll try and call round some auto electricians tomorrow. Quote Link to comment Share on other sites More sharing options...
½cwt Posted April 23 Report Share Posted April 23 @Richard Hamilton looks to be more than just a coding issue?? Quote Link to comment Share on other sites More sharing options...
Richard Hamilton Posted April 23 Report Share Posted April 23 I'm a bit flummoxed. After the fuse replacement, did a flat battery cause the problem to come back, or was it a random event? Replacing the fuses seems to have reset things, so what happens if you repeat that process? The battery drain won't be helping, so you need to get that sorted. Are Bavaria Auto Werks in Aberdeen worth a try? 1 1 Quote Link to comment Share on other sites More sharing options...
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