Help, I have numerous questions

First, I just inherited a 1984 733i very clean with 133,000 miles and there is a yellow caution light that blinks but goes off evenually what is that light for? Also can anyone tell me what is the inspection light for and what makes up the inspection. My radio don't play it just says CODE. My climate controls don't work. If anyone can help me or send me a link to go to it will be very much appreciated.

The inspection light eludes to the time the car would require it's regular service interval. It's likely that the oil would be changed along with a host of other inspections and possible replacements; eg., filters, fluids etc. You will need to punch in a code to operate the radio. Hopefully, the last owner has it, otherwise you may have to contact the dealer for information on how to get your radio working. Check the vehicle's manual also for clues. Hope this helps. Peace.