Turn Signal Arm Causes Cluster Warning Lights to FLASH!
 

1993 300SD W140.

Occasionally while driving and I move the Turn Signal Arm to indicate a lane change some of the Instrument Cluster Warning light flash once really fast and then the RED Fasten Seatbelt Light continues to flash for about 5-7 times afterwards.

(It’s hard to see exactly what Warning Lights flash because it happens so fast, but you can see various Amber and Red lights flash)

Sounds like a short somewhere??? Any ideas?
Wiring Harness has been changed about 4 years ago.

The only other electrical problems are non-functioning Drivers Door Speakers & non-functioning IR Keyless Remote.

Any help appreciated.

In the shop we call that "the death blinks". The cluster is on it's way out. Some have had success replacing the power supply filter caps on the circuit board, but I have not.

Bad power supply in cluster, the previous post is correct, some have had luck replacing capacitor. This was a known fault, and MB replaced clusters under warranty, it needs to be rebuilt. I am living with mine, read all about it
http://mbcluster.com/
The speakers are probably bad BOSE amp, the locking issue ia also a non related issue

Now i know
 

Thanks slimak9 for asking and thank you duxthe1 and Peter Guenther for your reply my 92 does this too.i am going to live with it.