"RN-" display?
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Joined: Jan 2009
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2005 C230 Sedan 6spd
"RN-" display?
Hi guys, new to the MBWorld.org forums. I've used the search function but no luck finding info I want so here it goes: I bought a 2005 C230 6spd 3 days ago and love the car. On the bottom digital display in the cluster where it shows either the ambient temperature or the digital speed and the clock, below the clock it says "RN-" and I have no idea what that means. Anyone care to give me an info about it? Thx!
MBWorld Fanatic!
Joined: Nov 2007
Posts: 2,078
Likes: 4
From: NYC
2012 C300 4Matic
Hi guys, new to the MBWorld.org forums. I've used the search function but no luck finding info I want so here it goes: I bought a 2005 C230 6spd 3 days ago and love the car. On the bottom digital display in the cluster where it shows either the ambient temperature or the digital speed and the clock, below the clock it says "RN-" and I have no idea what that means. Anyone care to give me an info about it? Thx!
MBWorld Fanatic!
Joined: Nov 2007
Posts: 2,078
Likes: 4
From: NYC
2012 C300 4Matic
How strange...
You either have a bad display (doesn't look like its the display, but can't really say for sure) or a bad controller for the display (which would be the gauge cluster itself). I guess it could also be the TCU, but I would expect a problem with the cluster itself to be more likely.
Maybe you'll get lucky and it's just a software issue that will fix itself with a reboot - I would try pulling and replacing all the relevant fuses (for TCU, ECU, and the cluster itself). Obviously you could just pull neg battery cable, but that seems to be a bad idea unless absolutely necessary with these cars, and even then its a much better idea to plug a small 12V battery in parallel when changing the original to prevent any power loss / surge.
You either have a bad display (doesn't look like its the display, but can't really say for sure) or a bad controller for the display (which would be the gauge cluster itself). I guess it could also be the TCU, but I would expect a problem with the cluster itself to be more likely.
Maybe you'll get lucky and it's just a software issue that will fix itself with a reboot - I would try pulling and replacing all the relevant fuses (for TCU, ECU, and the cluster itself). Obviously you could just pull neg battery cable, but that seems to be a bad idea unless absolutely necessary with these cars, and even then its a much better idea to plug a small 12V battery in parallel when changing the original to prevent any power loss / surge.
Last edited by acr2001; Feb 2, 2009 at 08:20 PM.
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