My high beam switch doesn't work correctly. Plus now the cruise control stopped working. Could these be related?

SOURCE: Air Conditioning & Cruise Control

either the relay for one or both is freakin out or there is a short in the wirering for those two components

SOURCE: no high beams on a 99 chevy

look under your hood for the fuse/relay box will be on left side behind battery. the relay and fuses will be in there check fuses also

SOURCE: Low Beams Stay On

Also, the daytime driving lights are controlled by relay. It's possible the relay may have melted down inside and is shorted, remaining on even when primary ignition power is off. The relay runs about $15.00 to $20.00 USD and might be worth a shot to replace. Likely you can get one at a recycling yard for a dollar or two.

SOURCE: 2002 Impala, headlights work however they blink

This may be the start of a worse problem that the Impala eventually developes. The Body Control Module has a design flaw along with the Passlock anti-theft system. You may get away with just replacing the BCM for now. It needs to be reprogrammed at the dealer and the car will not start if you replace the BCM without reprogramming it. I would also recommend against replacing it with a remanufactured one. Repair cost is going to be around $500 at the dealer.

If the Passlock system is also at fault, add another $500 for a new ignition switch and cylinder. If you haven't experienced random starting problems yet, they are coming soon. When you turn the key, nothing happens. I thought my 2002 Impala may have been immune to these problems that I've heard about constantly, however, at 90,000 miles, it became "possessed". The symptoms started slowly and got worse. Beside the interior lights flashing like strobs in the middle of the night (while the car was not running), the headlights would occasionally click off and on a few times while I was driving at night.

The relay switch you hear clicking is the Battery Rundown Protection relay. I'm suprised your battery hasn't drained to the point where the car will not start in the morning.

SOURCE: 1998 cavalier headlights will not work. low or

check wiring in the front bumper for corrosion big problem relating to cavalier and sunfire