Trunk Close Assist
05-24-2022, 11:53 PM
#1
Newbie
Thread Starter
Trunk Close Assist
Hello all,
if anyone can shed some light on this one, I'd appreciate it. Been combing the threads and couldn't find anything on this specifically....
On my S500, I have had a parasitic battery drain for years and haven't been able to figure out what is causing it. I have pulled every fuse and relay and used a test light to see which circuit was open, but this method did not work. The drain isn't too bad: if the car sits for about a week, the battery will usually be dead when i go to start the car. But if driven everyday, you wouldn't know there is a drain. After doing some thinking, I am wondering if it is being caused by the vacuum pump in the trunk possibly. The reason why I say that is sometimes I have randomly noticed that the chrome handle for the trunk's close assist will be stuck out, even though the trunk is closed. If I open the trunk and close it again, the close assist will draw the handle back into the trunk like normal. Also, the vacuum that draw the trunk closed has never worked to my knowledge since I've had the car. From what I've gathered... it sounds as though there is maybe a serious vacuum leak, that makes the pump randomly engage the handle, and/or the pump may have lost some functionality and has possibly burned out partly. Would this be a fair assumption to think this is causing the drain?
if anyone can shed some light on this one, I'd appreciate it. Been combing the threads and couldn't find anything on this specifically....
On my S500, I have had a parasitic battery drain for years and haven't been able to figure out what is causing it. I have pulled every fuse and relay and used a test light to see which circuit was open, but this method did not work. The drain isn't too bad: if the car sits for about a week, the battery will usually be dead when i go to start the car. But if driven everyday, you wouldn't know there is a drain. After doing some thinking, I am wondering if it is being caused by the vacuum pump in the trunk possibly. The reason why I say that is sometimes I have randomly noticed that the chrome handle for the trunk's close assist will be stuck out, even though the trunk is closed. If I open the trunk and close it again, the close assist will draw the handle back into the trunk like normal. Also, the vacuum that draw the trunk closed has never worked to my knowledge since I've had the car. From what I've gathered... it sounds as though there is maybe a serious vacuum leak, that makes the pump randomly engage the handle, and/or the pump may have lost some functionality and has possibly burned out partly. Would this be a fair assumption to think this is causing the drain?
Last edited by BlackVinDiesel; 05-25-2022 at 12:08 AM. Reason: Left out key detail
