The light on my EDU in a 1992 9000 Turbo does not work. It worked when I
bought the car but the unit went dark shortly after that. Recently the
sun shone on it and I noticed the battery voltage is displayed seemed
resonable, so I investigated further. I can barely read the display by
shining a flashlight on it but otherwise it is dark. But aside from
being dark, it seems to be working!

The EDC (electronic display control) is to the left of the ACC control
and I can pop that out. This contains the clock and two buttons, INFO
and R (reset?). It has a sensor which controls the brightness of the EDU
(electronic display unit). The EDU is mounted in the instrument panel
directly under the speedometer. It shows voltage, outside temperature,
mpg and miles to empty and contains the check engine light, low oil
light, stuff like that. On Automatics, it also shows gearshift position
(PRNDL).

So, does the EDU have a light bulb that needs replacing? Or is the fault
in the EDU unit or the EDC unit which controls the light in the EDU?

I removed the ACC and the EDC and tried to reach in behind the
instrument panel  to where the EDU is and I cannot feel anything that
feels like the EDU, so I am not sure if it pops out or if I must take
apart the dash to get to it.

Advice is appreciated. This car seems to be slowly coming together.

Charles