I have created a problem with my 2004 w163 after changing the cluster lights to LED.
Everything was fine for a few days until the clock/gear display was flickering. I checked to see what the problem was and assumed the bulb was loose. It may have been because the bulb fell out as I was removing the socket. I got the bull out, reinstalled, and reinstalled the cluster.
Now all three; clock/gear, outside temp, and odometer are weak. I can faintly see the display and there are no pixel problems. It almost looks like the pixel lighting has reversed the normal display. The display has darkened pixels and the numbers have blank pixel, showing the numbers. I can’t remember how it was before when working properly. (Should it be blank pixels with darken pixels for the numbers l) Everything else with the cluster is working properly. I found out no power was at the circuit board for the lightbulbs in these displays. Any clue why there is no power to these three bulbs only. If I put 12v to one of the three bulbs they all three illuminate installed in the cluster. Voltage across these three bulbs was .726dc. Voltage on other cluster bulbs is 12.something DC.
I think these bulbs are on a can bus that supposed to give power when the door opens. I believe this bus is controlled by the BCU. This is above my electrical troubleshooting capabilities. Does anyone know if there is a fix for this. This is my daughters first car and I would like for her to be able to see the time and gear while driving.