2007 Impala, lights blinking and doors locking all the time
 

Hello,
I have a problem with my 2007 Chevy impala.

With a door open, without the key in the ignition, my dome lights blink randomly.

If I turn the ignition on and start the car, the doors lock in unison with the blinking. Also my IP and center console blink.
When IP blink the engine temp meter goes to 0 and back up again while the velocity, fuel level and rpm remains correct.

All exterior lights blink with the interior if I have the lights set to "auto", but if I put it "on" the exterior lights does not blink.

I checked the battery voltage when the car was running and it was around 14.5V and when the blinking happens there is a momentary drop to around 13.8V. All fuses are ok.

What can be my problem? Any ideas?

BR