GM Truck Club
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER
Results 1 to 9 of 9
  1. #1

    Default interior electronics??

    ok so just bought a used 2001 silverado though i got a good deal 115k pretty clean no rust.
    drove it everthing worked.
    starting to find little things wrong.

    hvac controls only work on #4-#5 so thinking need new control unit

    rear veiw mirror has temp compass but doesnt work when i turn on every light is on so looks like 88 with f and c lit
    the dimmer works the onstar works

    isnt the radio and interior controls supose to work for few minutes after key is turned off (and door not open yet)
    my last truck was like that and work like to have that on this one.

    any imput or advice would be greatly appreciated

  2. #2

    Join Date
    Sep 2010
    everett, massachusetts


    first I would use a meter and check fuses. also make sure fuses are held tightly in the sockets.

    on the HVAC manual or auto control ?

    if the fan speed is not working correctly I would replace the resistor module next to the blower under behind the glove box.

    when the ignition is turned to off the radio should continue to work for about 15-20 min. when the door is opened it will shutdown..

  3. #3


    Fuses are good it is getting power just display is fully lite up so looks like 88 and both f and c are lit up

    Manual controls on hvac
    Just don't want to buy new control and new rear view mirror is can be fixed

    - - - Updated - - -

    And turn key off and everything shuts down
    Would like to have radio windows still working for the 15-20 min
    Is there some sort of settings that can be changed.

  4. #4


    x2....on the Problem with the Fan Speed not working Correctly, being the Blower Motor Resistor going Out/Bad.

    In the this Diagram, Number #21
    is the Blower Motor Resistor


    5.3 l 3.73 l G80

  5. #5


    What would be the best way to test the resister module

  6. #6
    Jr. Engineer BRB46's Avatar
    Join Date
    Apr 2011
    Western Mass


    Do the interior lights work as they should. Might be a problem with the door switch.
    2006 Silverado 1500 5.3L ecsb Z71,afe pro s dry air filter, color matched tailgate handle and bezel,color matched front bow tie, led interior illumination, 5000K HID lows, Black powder coated wheels, Blacked out body side moldings, Rough Country 2.5" level/lift kit, Magnaflow muffler

  7. #7

    Join Date
    Sep 2010
    everett, massachusetts


    you remove this resister assy and look for damage. you will see the resistor board corroded/burnt. also you may find that the connector to this module is corroded.

    being in the rust belt ingestion of corrosive chemicals gets into the air box and then all this occurs. the assy is at auto zone for about 25.00 USD.

    since the vehicle is this old this may be the 2nd one installed. most have this fail just as the 3 year warranty ends. the aftermarket resistor / relay assy is far better then the GM OEM one since it is a sealed unit to protect from environmental damage.

  8. #8


    I had the same problem and it was the fan speed switch on the control unit in the dash. I went to a junkyard and picked up a switch for just a few bucks. Might solve that problem for you.

  9. #9


    I had the same issue with the mirror on 2 of my trucks. Both did what you are describing when it was over 90 degrees outside. One of them I never fixed because the truck was totaled. the other I fixed by simply playing with the wires at the connector on the back of the mirror. I just pushed the wires deeper into the connector and the mirror works fine now.

    1995 Silverado 4x4
    6" BDS Suspension Lift-3" Body Lift-Add A Leaf in rear -Trailmaster SSV Shocks-Duel Steering Stabilizer Kit -AirAid Cold air intake-
    4.56 Gears with Detroit Auburn Locker-Pro-Comp Traction Bars with duel shocks-Aluminum Skid Plate Kit-38.5" x 16.5" Mickey Thompson Baja Claws-Constant Dropping fuel gauge

    2005 Yukon XL Jet Power Programmer, Bilstein Shocks, Bilstein rear springs, Helwig Anti-sway bars, EGR Window Visors, EGR Hood Shield, Denali Headlights, Headlight harness upgrade, GE NightHawk Bulbs, White Night Rear lighting system, Russell Braided SS brake lines, PowerStop Brake pads, PowerStop cross drilled and Slotted Rotors,
    2002 Silverado ext cab 2wd (Sold)
    2003 Yukon XL (Totaled)

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts