Date registered: Apr 2005
Vehicle: '86 500sec
Location: West Sussex, England.
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
RE: ML430 radio code problem
I have had the same problem over the years with a couple of head units. Your first step should be with the garage that serviced your vehicle as pointed out above by Tatnhu.
The next Procedure you could try(if you get fed up with waiting for the garage to sort it out) is to pull the head unit out again, wrap it up in a couple of plastic bags, and then pop it in your freezer for about three days. What this does is take the unit out of its normal operating range, and should wipe any memory that deals with security codes etc.
After three days, take the unit out of the freezer and bags, and let it defrost at room temp for 24hrs.
Upon refitting it should let you input any number you want for a new code.
As I said above this method has worked for me in the past on a couple of different makes of head unit.
The good thing about this method is that if you do STILL have to take it back to the garage, it will leave no evidence of tampering with the unit etc.
Let me know how you get on.