OB monitoring blown fuse, duh

[Bmwtvboy]

Golden rule: Check fuses first. Other day, key fob stopped working automatic everything. Still started and ran the X. Week later, check the On Board Monitoring fuse in rear. Bingo, 30amp, cooked. What may cause this? How would the system overload? No Codes. Everything works normally. Although, the other day, after fuse change, SES on for two days, than off. Odd.
Just replaced both rear window regs, with original motors. Less than an hour each time. Curious what I should look out for.

[andrewwynn]

Random blown heavy fuse usually a wire worn through at a sharp metal edge somewhere shorts when you hit a bump.

Very hard to find but sometimes you can by shaking what wire looms you can reach.

Could be harder: one of my nephews put a coin into my dad's cigarette lighter. It would blow the fuse on random bumps. Took a couple months to figure out

[Bmwtvboy]

Good point. I don't imagine it's the rear windows I replaced the regulators and it blew within a couple of weeks. I use the fob to roll windows down n unlock/lock. It wouldn't be the Climate C.Module? I know it's done and I need another. I'll keep checking around the vehicle. Thanks.