I have an 89 toyota cressida that has cruise control issues. Green cruise control light would not come on. Fixed that problem. Cruise will not engage, checked BOO switch for excessive play, continuity open and closed on brake circut and criuse circut (.04 Ohms resistance in 20 range)returned the BOO switch and adjusted.I check the connections at the cruise control computer, the switch, the actuator, the vacuum control head and the cruise control cable for freedom of movement. Also checked brake lights for proper function. What am I missing?