Chrisrelfy

Hi, I am new to writing posts in forums so be gentle…. I will try to add as much relevant information as I can. Firstly I would like to thank some of the other forum members who have helped me so far to try and diagnose the problem I am currently having. I amongst others I have read: https://rennlist.com/forums/cayenne-955-957-2003-2010/1056770-kessy-unit-drain-my-battery.html https://www.renntech.org/forums/topic/37055-keyless-kessy-entry-problem-fixed-after-5-dollars-and-1-hour-o/ Although these posts have helped me to narrow down what the issue I am having might be, they haven’t solved the power drain problem I am having. My troubles started a few months ago after buying a 2003 Porsche Cayenne Turbo 955. The car is low mileage for its age (74k) but is suffers from a flat battery after standing for roughly 2 days. The previous owner used to keep the car on a constant trickle charger stating “These old cars all have flat batteries after 1-2 days”. I knew that isn’t true but as someone with previous experience with parasitic power drain issues with cars I didn’t get too worried about the problem. The battery on the car is new (bought by the previous owner, it’s the correct size and I have a receipt to prove its age!). Things I have done so far: · Used a battery tester to fully verify the battery is good. · Pulled fuses to confirm which fuse was the culprit. I did this after connecting an analogue ammeter between the battery and the car. After waiting for the initial current spike to calm down I found that Fuse 41 (KESSY) on the left hand side fuse panel was causing a 2 amp draw. After removing the fuse the current draw dropped to almost nothing (that I could read using the analogue readout). · After finding out that Fuse 41 was the culprit I removed the fuse and wired in a remote control relay as a temporary fix to stop the power going down when the car is not in use. o This “bodge” solved the power drain problem, however it’s not fixed the original issue, it’s just a sticking plaster! o After reading another post it was mentioned that the KESSY transmitters/receivers which are in the doors and the bumper can cause a parasitic power drain where that’s a faulty unit. I have since removed all of the KESSY units from the car and…. No luck. o I had a quick look today to see about replacing the KESSY ECU itself but it looks like a pig to get to (it’s above the driver side foot well) there is a thick as your arm wiring loom coming from the bulkhead going right underneath where you could remove it. So I am not keen on replacing… also a call to a Porsche main dealer mentioned that they have only sold a handful of replacement KESSY ECUs so they suggested that’s unlikely to be fix the issue, however I'm not sure. I am now completely out of ideas. Anyone else had a similar problem(s) who could offer some advise? Thanks very much in advance, Chris.