Hello, I'm Chris.I will do my best to answer your question fast and accurate using the info you have provided. Thanks for visiting Just Answer.
I assume the display is just blank?
What model vehicle is this?
Have you verified you have all the powers and grounds to the module?
Sorry about asking the model, you wrote that already and I just skipped over it, just a habit of always needing to ask.
You need to use the below diagram and check these 2 wires for power with the lights on and when the key is on, the ground will be fine since the maps work.
If its non operational and these checks pass then you need to remove the module cover and use a paper clip to touch the solder joints next to the resistors while its plugged in to see if it begins working. Often one or more solder joints break and just need more solder to make a good connection and begin working again. If this fails then a new module is needed.