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Old 05-30-2002, 02:49 PM
blackmercedes's Avatar
Just a guy
Join Date: Dec 2000
Location: St. Albert, Alberta, Canada
Posts: 3,492
Funky outside temp display problem solved.

Yesterday, the outside temperature display on the C230 was locked at +15C. This was regardless of the actual temp being about 26C.

I called the dealer, and explained that the display seemed "locked." I had checked the sensor output through the diagnostics mode on the ACC panel, and the sensor was reading the proper temp, just not displaying it properly.

I shut the car off for a while, and came back. Same thing. Well, the dealer explained that they'd have to replace the sensor, the display, and a whole bunch of other parts.

Since they can't get the car in for two weeks, I thought I'd try something kinda novel. I pulled fuses 19 and 30, which are instrument panel fuses. I waited about 1 minute, and replaced them. Guess what? The outside temp display works just fine again. No problems encountered.

Microsoft would be proud! I just "reset" it...
John Shellenberg
1998 C230 "Black Betty" 240K

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Old 05-30-2002, 03:07 PM
jsmith's Avatar
Join Date: Aug 2001
Location: At Sea
Posts: 1,729
next thing is to wire a keyboard to the fuse box so one can do the Bill Gates three finger salute (ctrl + alt + del). i ought to try this trick if there is a similar set of fuses in my car. strange but with the onset of 70 - 80 degree weather my lcd panel, which has been winking in and out, is now on solid. i have not been able to isolate this gremlin in my car. i even replaced the thermistor to no avail...
1993 300e-2.8
- gone now <sigh>
"Do not adjust your mind, it's reality that's malfunctioning"
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Old 05-30-2002, 04:09 PM
Registered User
Join Date: Jun 2000
Location: Saugus, CA USA
Posts: 1,974
I've been thinking mine may have been "locking up" too. Maybe I'll try reseting mine, thanks for the tip.
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