Question about 1999 Cadillac DeVille
Red black and gray are just half the connections. Red is positive 12 volts coming from fuse of circuit breaker. The black wire is either the ground or the main hot wire going to the blower motor (3 pin connection only), and the gray wire (if is is small in size) is a variable voltage coming from the body control module requesting speed for the blower motor.The blower control module varies voltage on the main wire going to the blower motor, supposedly in accordance with the requested voltage from the body control module. Usually if all fuses are okay and present on the apprpriate wire of the blower control module, the a blower motor that will not run or stays running after the key is turned off is the fault of the blower control module. If the blower control module has failed the the cause must be determined (over amping blower motor) or else new blower control module may fail when powered up.Usually blower control modules have more than three wires. Usual connections are: B+ (battery voltage) GND (chassis or engine ground), two large wires going directly to blower motor (can be any color, but are usually 10 guage in size), and an optional wire that reports voltage level back to the body control module.
Posted on May 29, 2009
Sounds to me your on the right track. black ground, red hot, gray variable. your doing what i would do. if you can get to ware it plugs into motor unplug it and run 12 volts stright to it from your battery and see if it runs. as far as voltage i can't believe it would be more than 12 v to it. some thing you might want to chk. as long as your under the dash if its there is the resister, they chg.heater motor speeds. and if there bad motor may not run at all.
Posted on Jan 11, 2009
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Posted on Jan 02, 2017
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