Have Toyota Questions? Ask a Mechanic for Answers ASAP
Was the Problem ever evident before the battery change? How many miles are on the vehicle?
Is the battery fully charged at this time even though it is a new battery? Can you post a picture of the instrument panel showing the displays that are not illuminated when the Ready light is on
Make sure the display does not have a business card or piece of paper up against it. That is a reflective image that you see. If a piece of paper slides down inside the flat portion of the display will block the letters or make it look black. Do any of the buttons on the monitor allow the monitor to light up or activate? Can you power on the radio and get any sound out of it?
I have never seen a 12 battery cause the display to not function or do anything unusual except causing the warning on the dashboard to put the car on a level surface and set the parking brake because the parking engagement mechanism requires at least 12 V to put the vehicle in park. As a test about the only thing you can do would be to remove both battery cables from the 12 V battery. Isolate them from the battery then take a jumper wire and jump across the two terminal ends this will do a hard reset on the system and drain all of the memories from the computers. Also check all of the fuses. There are fuses under the hood fuse box and fuses under the left side of the instrument panel. In some rare cases it can pop fuses When the 12 V battery fails or something spikes in the system. Let me know What you find with the fuses after about five minutes of the battery cable ends being jumpered together remove the jumper and install the terminals on the battery and ready to vehicle on and see if the display comes back after you check all the fuses. If the fuses are all good and the hard reset does not bring the display back it's possible the display has failed.