<human>: So I'm housesitting for my old boss as he's on a family vacation. (he has a large dog that needs to be taken care of daily)
So I dropped them off at the airport with their car. He told me that the window was having some electrical issues, and wouldn't close. He tells me that it should eventually close, and I should try it when I get back after the car rests for a while. 

So I get back and park. The lights are off, everything's cool. I go to turn it on to close the window. The lights in the dash flash, and then nothing. The key turns, but the car does not respond. I think I just left the lights on (but now that I think about it, the car bings if that happens, so that probably wasn't the issue), so I get my boyfriend to come over and give the car a jump start.  Car now works, yay! But the window still won't close. There's some blinking alerts on the dash (a car with a wrench in the middle of it, fix...car?) 

I turn off the car, double checking to make sure everything is good before I turn it off. 
I come back later, and it does the same thing. The dashboard flashes and the car acts like it's starting, but then everything stops. From then on the key does nothing. I have experience driving the car (I've house-sat twice before this for them) and this has never happened.

I'm freaking out because I'm someone who likes to leave a place better than I find it, and I'm super afraid I ruined their car. I now have garbage bags over their windows, but some water is still getting in from the rain. I don't know whether to call my friend while he's enjoying his vacation, or wait until he gets back to tell him the problem. 

What should I do?

Provide a brief overview of the text.
<bot>: housesitting for friend. Drive car back and it won't start without being jump started. How do I tell my friend?