Hi all I have a cl55 with automatic trunk. At this time its not self opening or closing.
What i have done so far.
1) check PSE pump and latch = WORKING
2) ran Xentrey Diagnostics no codes
tried to initialize the trunk = Failed
a)first step - open trunk = Success
b)second step - close trunk using button = failed
Please let me know what else i can test.

 

Turn it over to your dealer service.

 

Hahahaha. It's not that serious... I'm sure it's an easy fix.

 

I had similar problem. Fixed by changing out switch, and then normalized trunk via Xentry.

 

​​​​​ which switch did you have to replace? Did it show up in xentry as being bad?

 

The switch I replaced is the one in the trunk lid, the one you push to close. I can't remember if it showed bad in Xentry, but IIRC I think it did show no activation. I tried everything to get it to work, and finally bought a used switch on Ebay and that fixed it. Figured it was worth $15 to try at that point.

Looked at my notes. Switch I replaced was PN 220-821-7251

 

Just a quick update, I resolved the trunk issue. The drain plug was completely clogged underneath the pump. I pushed out the plug drained the water. Dried the foam housing. Took the cap of the top of the pump and it was not good. I cleaned everything out and blew out all the water. I then try to put power to it and got spark from the plug. I took the pump off of the pump housing. The pump wasn't turning so I grabbed a pair of needle nose pliers and loosened it back and forth. I then applied power again to the plug and it spun. Re-dried everything off clean everything as much as I could reassembled and now the trunk is working. My only question is how do I set the height as it only opens halfway with the button. I checked the convenience settings on the dash but there was no option for the trunk...