Theft system?

Thank you for this psiot I had this problem and had to get a used BCM and have it programmed to the car all fixed! Cost me $260.00 I love this site.

My keyless entry stops working intermittently, and when it doesn't work, I notice that the odometer has reset to zero, and I have to start the engine to re-engage the keyless entry. I notice that my battery power varies from 14.7 down to 13.0 at different times. What can I do to fix this most annoying problem?
Thanks,
Sandee

My 98 Deville does the same thing. I notice my interior lights will be dimmed or flicker on and off also proceeding keyless entry not working and odometer being reset but as soon as I turn my ignition on, it works automatically. Please notify me if you find out the problem. Also you can hold down the off button and the red warmer button on climate control buttons for a few seconds and it will display trouble shooting codes that will narrow the problem.