i know it's now march, but handn't seen your post till now. i have a 2000 and the roof has been leaking, very minor and went unnoticed except when driving in the rain. I don't drive it that often and it's been kept in the garage most of the time. the leak has caused some curious problems that perplexed me till now. the passenger seat leather was starting to look dry and shrivel. problems that indicate that its been wet. but how?
so since this last rain storms that lasted a month in california. i was motivated to find the source of the leak in my roof because it was dripping on my wife. i cleaned the drains thinking it was clogged. it was not. i tried to tape the metal to the rubber, that did not stop the water. i finally sat in the passenger seat and watched as the rain water was dripping from the front plaster cover on the sunroof. i poped the cover off and was drenched from the water collected in the plastic cover. the water was seeping through the glass and the rubber seal.
luckily i have a friend with the same vehicle that does not have the same problem. i poped his cover off and found that the metal and glass has chauking sandwiched between. i believe that the factory goof and did not chaulk the two pieces on my vehicle and had been leaking slowly since new.
as for your stereo, you amp sits under the passenger seat, when wet, it will short. but let it dry and it will work again.