So it rained a bit last night for the first time since I've had the car and I noticed some water coming out of the motion detector box behind the rear sunroof. I know sunroof drains clogs are common, but I'm only familiar with leaks down the A-Pillars. Is the motion detector box a common place for clogged sunroof drains to leak? I'll be cleaning my drains tomorrow but just want to know if I should be troubleshooting other areas as well.

 

I bet the grommet around the antenna is cracked

 

That's a possibility. I actually took a peek at it earlier and didn't see anything obvious, but I'll give it a closer inspection tomorrow. I know the PO put a shorty antenna on there so they could've been careless and done something. Hopefully it's something that simple. I was thinking there can't be that many places of ingress for the roof... Not sure what it looks like under the rear sunroof, though.