I have a somewhat similar problem I just replaced the water pump (2004 LS sedan), timing belt, serpentine belt, flushed the radiator and did an oil change. Everything now works fine except that the radio doesn't work, but shows a message: "code_ _ _ _" like it's asking for a code or something. I disconnected the battery to change the timing belt...

The clock works fine. I have never seen this before (and this is the second time I changed the timing belt (only 75K mi) :/

Help?