Volkswagen - Passat :: Car Randomly Will Start On Its Own Or Not Even With A Jump

My son has a 1999 VW Passat Wagon with a 1.8 turbo 230,000 miles. He came home from work, parked his car and the next morning for school it did not start. He inserted the key and turned it and the engine would not crank. All dash lights worked and such. He did notice the power window were not working and the interior lights either. He jump the car and worked fine, until he shut it off, and again needed a jump to start.

I looked at it, battery and alternator tested fine, battery is only a year old. the car now randomly will start on it own or not, even with a jump. I had no codes pop up on the computer scan. I am hearing things like climate control module and another fuel module in trunk and water issues. I was told to check connect at starter and change iginition switch. Have not done the ignition switch yet will need to get car up on block for starter as my son has lowered the car quite a bit. I had the computer codes checked by a VW tech and he seems stumped too.