1987 Cadillac Brougham Heater and climate control problems

1987 CADILLAC FLEETWOOD BROUGHAM
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LACELLER
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Electrical problem
1987 Cadillac Brougham V8 Two Wheel Drive Automatic 97000k miles

Display on electronic climate control does not show.Heater fan works at a very low speed but you cant use any of the controls. When you step on the brake pedal the heater fan blows on high, as soon as you let your foot off the brake heater fan slows down again. Power seats, tailights and wipers also quit at the same time. Repaired the tailights with a wiring repair,only fixed the lights nothing else.Been looking for a bad common ground, but coming up short.Any ideas would be appreciated.
Jan 18, 2010 at 9:36 PM
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SCOTTY DEE
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With a test lamp, verify whether or not there is power to the HVAC controller. Let me know.
Jan 27, 2010 at 6:15 PM