Definitely your amp i have had this problem well over a year and just got fixed, if you have radio shop check your amp output i guarantee it is shot, that spark when it kicked back on does scare the *BLEEP* out of you....Mine was mark Levinson with navigation, dealers want 550-900(depending on dealer, sewell was best priced) for new one and then trade in of your old one. Lexus then sends to a company who i called to remanufacture they will only deal with lexus and not repair for you....Get the part number off amp and look on ebay for tested one i just got lucky and got one however i know on the 2001's there was a recall so now i run the chance of having this one go to if it hasn't been remanufactured to fix the glich the originals had. what is your p/n? you can call lexus with you Vin number and they will tell you if there is another compatible p/n along with the amp you already have so then you may have two different amp part numbers you can search for on ebay.....They got u by the balls either way, i paid 319.00 on ebay for the used one tested and guaranteed........Only other option is to get aftermark and then they have to rewire and deal with all sorts of problems and its expensive........I can't tell you how many times i would come out in the morning and my car was dead cuz i didn't unplug my amp and in the middle of the night it kicked on and drained the battery dead......
From what you describe it is the amp.
Thanks. It is frustrating that I ask this to the dealer and they say it could be either thing, I need to bring it in for them to look at. I know they are instructed to do this as it is easier to make a sale on this or anything else with me there, but from your reply it seems a bit more black and white. I appreciate it.
Your welcome