Quote:
Originally Posted by Texholdem
my 1990 300CE has no outside temperature reading. I replaced the display unit but it remains the same. There is no digit visible, just background light.
What is broken? Thanks!
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You most likely have no power to the module's temp electronics because if there was power the display segments would be visible even with no sensor connected. Without a sensor a powered module will read 136+. There appears to be a ground connection because the illumination works. If you have the illumination bulb lit all the time with the ignition turned on, it may very well be that you have the connections to the illumination bulb and the module power switched. Double check those connections and that might get things correct! Good Luck!