The pcb is pretty simple and it's easy to tell the grounds without circuit diagrams but try this. Smack the top of the dash and see if any start working. This is an easy test and doesn't hurt anything. If they work it's a positive bad area and if not does not mean it's not bad.
Just a thought.
Well, today I tried yours and Nick's favorite fix "Hit it" but no dice. Just to summarize What I know so for ..
1. Dashboard gauges are totally dead not a single needle moves like speed, Temp, gas, Tach etc. However, odometer mileage decimal numbers work.
2. In the last 14 days, Four times dash needles start working and stayed working when car started and throughout driving. Once the engine stopped and next time start dash stays dead.
3. ETS and ABS warning lights come on all the time when engine started and stay on no matter if needles working or not. Dashboard illumination works fine at day and night.
4. It was noticed when no needle was working, cruise control worked fine. This week cruise control does not work anymore.
5. Hooked up Innova OBDII analyzer to port and this message displayed " No DTC's powertrain or freeze frame data is presently stored in vehicles computer". The same message shows up even after driving the car for 500 miles in city and on freeway. I am a newbie but to me it appears either computer is not getting power or is bad. However, if it is getting power it should be outputting data to the OBD port. I believe computer gets power 24/7 to keep it's memory intact. All the fuses in the box were good when I checked couple of weeks ago unless there is one which I have not tested yet.
6. I have not tried yet disconnecting one of the terminal of battery and connecting it back after a minute or so to reboot the computer.
This is all I know and looking forward to any solution or suggestion.
Thank you.