Lights gone wild!

I have a situation that has baffled some of the best gear-heads in my area.
#1- I have no dash lights (Speedo, fuel gauge and temp gauge)
#2- the green Lcd(?) lights are bright in the dark and dim in sunlight!
#3- When running during daylight (Switch off) the running lights are on the dim (outside lights) not on low votage hi-beam!
#4- If I rapidly pull & Push the headlamp switch the service engine soon light appears breifly.
#5- When turning switch to acc or on, the battery and security light show up intermidiate.
Now, the only thing I have done is have a set of high output lamps installed (hi-beam only)
When the problem first started we unistalled them and replaced with originals. Problem still there!

Sorry for the length of post but didn't want to leave anything out.

Any ideas?

check the BCM

what year are you talking about ? Do you have auto lights or old switch you say push and pull

i just got a 00 impala LS its got the old school push and pull headlight switch

bcm