Yesterday while diriving normally, the Instrument Cluster only (not the Nav, Audio/Tel) went blank. (Dark). The car, a 00 S500 drove as normal, upon returning home, the car was parked for a few hours. I started the car again, this time no problems. I had to make a few errands so I took the car, no problem.

This morning I had the car scanned at my local mechanic, the only fault recorded was in the Airmatic and BAS from last month, indicating low voltage, There was no fault recorded for the instrument cluster.

Together we decided that it may be time to change the battery in the car which we did, he is going to do some research on this issue. Any one out there who faced a similar problem.

Many years ago used to own a W124 E300, the windsheild wipers came on eratically just before the battery died

 

Might be the cluster going bad.
If it is, thats an expensive replacement but common.