Can someone tell me what the arcs in this photo represent?
Usually a single arc, they come & go sporadically. Such an arc is pictured, but not mentioned in the owners manual.

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When you are using cruise control, the arc will reflect your speed. Anything else and I'm pretty sure it's glitching. Mine every now will flash the whole length....I've learned just to ignore it.

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 158k miles
06 E320 CDI "Rutherford", Black on Tan, 177k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 144k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 72k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

Mystery solved! Thanks! i figured it was errant electronics, which one can get pretty good at ignoring

Mystery solved! Thanks! i figured it was errant electronics, which one can get pretty good at ignoring

The fix is rather simple, remove lower panel below steering wheel, locate N93 this bridges can B with can C buses ,key off disconnect the 2 eternity connections clean it all out reassemble. Moisture collects on this module due to its mounting and causes issues with the halo and a few other things. I'd be fixing my halo buddy!

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92 e300d2.5t
01 e320
05 cdi
85 chev c10

They're for the engaged cruise control.

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'06 E320 CDI
'17 Corvette Stingray Vert

My son’s W211 exhibited this behavior. I went to the junk yard and found another cluster and swapped the LCD out. It wasn’t terribly difficult. I didn’t document the swap but the disassembly was intuitive.

Not sure if the LCD itself was the issue or just jostling the connections around helped.

Worked great for the several months until the engine met its untimely death.

Definitely also want to check that Central Gateway under the drivers dash, had that problem too. Turned the car into a potato.

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The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech