Good day, everyone,

Please I need some expert opinion from pros and those with similar experience.

About a month ago, my 2009 Lexus ES 350 alarm goes off unprovoked. The key becomes ineffective and the alarm shuts off on its own after about 1-2minutes. I can only have access to the car manually because the key won't work at this time. When I turn on the car, it starts but here is the problem, when I switch it off, the fan goes off but the engine remains on with the dashboard lights staying on as well. To switch it off completely, I will have to disconnect the battery. When I reconnect the battery back, it remains the same, the car starts but won't switch off completely. By now, the key starts working.

I called my rewire who came a day later to take the car for about 2 days. Mind you, when the rewire came, the car had returned to normal. When he returned the car, everything was fine until two nights ago when rain fell. The alarm goes off and the same thing happened.

On doing some research, I was only able to get information from a mechanic site that said such issues are caused by the 'body computer' technically referred to as the Body Control Module. That when the car is been washed or when rain falls, water may get into the body computer and it begins to display all the above-mentioned issues.

If you have had the issue before, how did you resolve it and for the pros, how can I resolve it? Thank you for your responses.