1) I'm not 100% sure of the battery's age. I just bought the car. The previous owner said it is 6 months old.

2) I yanked the RCM and soldered some really bad solder connections on the circuit board. I'm still having the same symptoms. However, the service engine light for the "secondary air injection system," and the "lean fuel burn" has not come back on. I may have inadvertently fixed that problem.

Somehow the issue seems to have to do with the brake lights. The "light out" indicator on the dash board only comes on when the brake lights come on (ie: pressing the brake pedal with the headlights off, or turning on the headlights). I replaced all the indicator bulbs so I don't have a bulb out.

I may pull the instrument panel off and see if the indicator behind the panel is pulling too much voltage. The sensor may have failed. I'm not sure how the brakes, indicator lights, and cruise control issues are all interrelated. I wonder if they connect to a different control module other than the relay control module.