1989 Toyota Supra Automatic Cruise Control

1989 TOYOTA SUPRA
120 MILES • 6 CYL • 2WD • MANUAL
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ED WEIDENHAMER
  • MEMBER
  • 1 POST
My cruise control works only when the ambient temperature is below 40 degree F. (????) The select switch (marked "Main") will only actuate when the temp is as stated. If the temp is higher it won't allow me to set a speed. I can't find a repair manual to direct me to what might be the possible reason. The "main" switch is located on the left side of the steering wheel and the "set speed, coast and cancel" switches are located on the right side. When it works, it works okay, but only when its cool enough. Weird, huh? I don't have a picture
Jun 13, 2008 at 11:45 AM
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KHLOW2008
  • ✓ASE Certified Mechanic
  • 41,814 POSTS
  • ASE Certified Mechanic
Hi Ed Weidenhamer,

You mean the main switch would only operate at below 40 degrees?

That means power is not supplied to the switch thus no operation of the system.

It most probably is a wire connection problem, higher temp = higher resistance so power supply is affected.

Hope I guessed correctly.

Test for power supply to main switch.
Jun 14, 2008 at 12:29 PM
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