interior lights dim when headlights are on
 

All my interior lightd dim after it gets dark enough for my headlights to come on automatically. Does anyone know if it could be a sensor? Any suggestions? Thanks.

Did you check the dimmer switch? Make sure the knob is turned almost all the way to the right, just before it clicks and turns on your dome and map lights.

I did check the dimmer switch. Someone told me it could be a module but I would have to go to the dealer because it also runs my odometer. It is all good with the daytime running lights. When it gets dark enough for the regular lights to come on, all interior lightd go dim. It's tough to watch the speed at night. I thought maybe there may be a sensor. Thanks.

that is really strange.. sounds like it might be a voltage issue... maybe...

Well if it's not the dimmer switch I'd be torn between a voltage issue like Boxman said or it's BCM trouble (the BCM controls basically everything electrical in these cars).

The BCM is the module I was thinking of. I was told a dealer has to put it in and reprogram it due to it also running the odometer. I was told that could run $150 and up. Thanks again.

Well a dealer would have to reprogram it anyhow because BCMs aren't plug and play - if you try to swap them the car won't start and the dealerships are the only ones that can reprogram them. What year is your car? 2006 or 2007? Those were the only years that the mileage was stored in the computer then relayed to the cluster - earlier years the mileage was stored in the cluster itself.

Was the car ever jump started?

Mine is a 2000. So maybe that would be a help since it's older.

I did change batteries recently though.

did it happen suddenly after you changed batteries?