Question about 2003 GMC Yukon XL

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My climate control unit in the dash doesn't turn on when I press any of the buttons. It is back lite but there no power going to the blower. The number display doesn't show any # when I turn the knobs. I checked all the fuses and they are all ok. It's winter time and I need heat. Thanks for the help

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  • GMC Master
  • 15,575 Answers

2 wheel drive or 4 X 4 ? Automatic or manual climate control
Do you know what DTC'S - diagnostic trouble code's are ?
DTC B1375
The ignition 3 voltage circuit is a discrete input to the HVAC control module. The HVAC control modules uses the input to determine that the ignition switch is in the RUN position. When the ignition switch is in the RUN position, ignition voltage is applied to the input.
Rather then guessing as to what the problem , not being able to diagnose properly , your best bet mite be to have a qualified repair shop check it out . Would need to hook up a professional or factory scan tool to check code's ,see if the climate control module will communicate with the tool .
HVAC Control Module
The HVAC control module is a class 2 device that interfaces between the operator and the HVAC system to maintain air temperature and distribution settings. The battery positive voltage circuit provides power that the control module uses for keep alive memory (KAM). If the battery positive voltage circuit loses power, all HVAC DTCs and settings will be erased from KAM. The body control module (BCM), which is the vehicle mode master, provides a device on signal.

Posted on Jan 03, 2018

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6 Suggested Answers

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6ya staff

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Posted on Jan 02, 2017

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emissionwiz

Marvin

  • 85222 Answers

SOURCE: 1995 GMC Sierra Ext Cab

You need to replace the blower motor resistor

Posted on Sep 23, 2008

Anonymous

  • 94 Answers

SOURCE: Front screen demister on Audi Avant A4 2004

ONE OF THE HEATER DISTRIBUTION FLAP MOTORS FAULTY.UNSCREW GLOVEBOX AND YOU WILL SEE THE ONE THANS NOT WORKING(TURN ON BLOWERS TO TEST)

Posted on Feb 18, 2009

Dennis Boxerman

  • 1300 Answers

SOURCE: 2003 Denali Yukon, no Brake lights, no Cruise Control, fuse is OK

Check your brake light switch at the pedal. This controls the lights and disengages the cruise when stopping. I'd look there before I go anywhere else. There may just be a wire loose. Could be a simple fix.

Good Luck and hope this helps.

Posted on Mar 15, 2009

Anonymous

  • 6 Answers

SOURCE: 2004 Yukon Denali

This is from the A/C Module located under the dash passenger side, check wether the internal fan is working if it is, then change the Module which is a small black part with two white metal blades like... and your A/C should work again...

Aymen

Posted on Mar 21, 2009

Anonymous

  • 1 Answer

SOURCE: 2005 GMC Sierra blower wont turn off

www.motorcity1.com This web site is all you need, it explains everything.

Posted on May 13, 2009

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