Hi All
I'm trying to get to the bottom of a battery drain issue on my R51 2007. .6amp or 620milliamps when car is left switched off...which is way too high and has been draining my brand new battery in about a day and a half! It was 620 even when I completely unplugged the IPDM unit and took it out of the car!!
After checking with a multimeter in amp mode...and pulling every fuse, relay and plug that I could see, I discovered that the main culprit was the Key Switch because when I removed the fuse in the glove box, the amp drain dropped by 450milliamps!
So for a few days I have been pulling that 10a fuse when the car is left standing. The other amp hungry circuits are Electronic Parts (possibly the computer and radio presets?) and strangely...Room Lamp...which is weird because all the interior lights are permanently off. Why this seems to be drawing about 60 milliamps, I have no idea! (I will recheck this as I might be in error)
So, can anyone think of why the Key Switch circuit would be drawing 450milliamps when the car is off and standing? A possible clue is that the keyless ignition hasn't worked since I got the car..I therefore have to insert the key to start the car. Of course, with that fuse removed...I can't even turn the key! Lol!
What else could be affecting that circuit? Where should I look?
I may end up going to the local dealer...but I'm not sure if they would know either...