Blower motor inoperable

2006 GMC YUKON
200,000 MILES • 6.0L • V8 • 4WD • AUTOMATIC
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JCZUHLKE
  • MEMBER
  • 1 POST
Received car from family friend. Blower motor will not turn on. Swapped blower motor resistor and blower motor with no solution.

Power to blower motor resistor is good. Ground is good and i added a piggy back line off of it to ensure. Purple variable voltage line leaving control module has power and adjusts with increase and decrease of speed setting.

voltage leaving blower motor resistor reads 12 volts constant. when i plug in the blower motor i get nothing.

i jumped the blower motor using a different ground lead and the positive resistor terminal. blower motor turns on.
Apr 17, 2020 at 11:15 AM
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ASEMASTER6371
  • CERTIFIED EXPERT
  • 52,796 POSTS
Good afternoon,

I attached the wiring diagram for you to view.

Can you verify signal voltage to the resistor in all the commands?

I know you have power at the purple wire but do you also have power to the other side with the motor connector attached?

Roy
Apr 17, 2020 at 12:08 PM