brake light
i also have a 1990and have had a similar problem. its seems to me when the brake light is on the cruise does not work no matter what the reason is. i discovered that my brake fluid resivour was a little low and just added some fluid.
i have a 1990 toyota 4runner 2door. i tried to replace the relays on the circuit board that control my rear window and accidentially sodered two points together. the board is fried. i drive 45 minutes to school every day. it has to rain sometime. any help would be greatly appreciated.