Climate control - no display- no power

fuse check for the fuse being blown make sure when you replace the fuse its the same amp same color and amperage

Doesn't work on any speed ? high - low . Does your's have manual or automatic climate control ?
Don't think a fuse problem , blower motor control processor more then likely .
Blower Motor Control Processor
The blower motor control processor is an interface between the HVAC control module and the blower motor. The blower motor speed control, battery positive voltage, and ground circuits enable the control processor to operate. The HVAC control module provides a pulse width modulation (PWM) signal to the control processor in order to command the blower motor speed. The processor supplies 12 volts to the blower motor through the blower motor voltage supply circuit. The control processor uses the blower motor ground as a low side control to adjust the blower motor speed.
Look here for fuse location an wiring diagram's http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model an engine size. Under system click on HVAC , subsystem HVAC controls . click the search button then click on the 5th blue link . This show's fuse location an wiring diagram for the blower electrical circuit . If you don't know where the rear fuse box is ,it's under the rear seat . It would be easier to just check under the passanger side dash at the blower motor control processor at the orange wire .
Do you know how to test electrical circuits with a voltmeter ?

GMC Yukon HVAC Blower Motor Won Turn On

ok why not say drivers demand
here its 86f and hot.
but do you want heat or cold
sounds like ATC auto matic climate control options
where it has a dial for spec. temperature:?
if the display was dead. id check power to it\
12vdc. fuse that look good can in fact be BAD
checked fuses means what.
we use a meter to check them
so if power is present on the display controller
then its bad. if no 12vdc there, the fuse or wires to it bad. for electronics to work ,need power and ground,at least active. see the ATC SELF TEST?
th e book is free see ZJ jeeps. all is there
chapter HVAC.
Chapter 24 , wiring is 8w.

posted 300+ times
here
again
http://jeepdied.com/books.html

Hi Anonymous, Randy here I 'll see if I can help you with your problem. By chance have you Looked under the hood in your engine bay on the fender there should be a black box, this is the Power Distribution Box it contains Fuses, Relays, etc. This carries the Higher load fuses and such. Please let me know what you find, Hope this helps and Good Luck.

I’m happy to assist further over the phone at https://www.6ya.com/expert/randall_d932ef6e01588b0f

You need to see a wiring diagram to see how the ignition switch allows or sends power to that 30 amp fuse. The switch may turn on a relay (maybe the ignition relay) that sends power to the fuse panel. Or the run wire out of the switch may itself turn power on at the fuses. You may have a loose connection behind the fuse panel.
Get a test light, pull the fuse, and check for power at the fuse terminals, with key on. One terminal for the fuse should have power. If not, power is lost between the ignition switch and that fuse. If it does have power, and windows still don't work, check the wire from fuse panel to the master switch-loose or poor connections, maybe a partially broken wire. If it looks good, check the ground wire for the windows. The ground wire originates at the master switch and will go back into the cabin to a nearby ground, possibly behind the left kick panel. If still no help, someone may need a volt- ohmmeter to start checking continuity of wires, voltage drops, etc.

if you look in the owners manual it will have a listing of the fuses and the location of the fuse box. 6-64

"The fuse block access door
is on the driver's side edge
of the instrument panel.
Pull off the cover to access
the fuse block."



NAME Usage
L BODY Retained Accessory Power Relay
LOCK Power Door Locks
DRV UNLOCK Power Door Lock Relay
LOCK Power Door Lock Relay
HVAC 1 Climate Control System
CRUISE Cruise Control, Instrument Cluster

IGN 3 Ignition, Power Seats
4WD Four-Wheel Drive System,
Auxiliary Battery
CRANK Starting System
INT PRK Interior Lamps
L DOOR Power Door Lock Relay
BRAKE Anti-Lock Brake System
RR WIPER Not Used
ILLUM Interior Lamps, Cargo Lamps
SEAT Power Seat Circuit Breaker
TURN Exterior Lamps, Turn Signals,
Hazard Lamps
UNLOCK Power Door Locks
HTR A/C Climate Control System
WS WPR Windshield Wipers

IGN 1 Ignition, Instrument Panel
AIR BAG Air Bag
MIR/LOCK Power Mirrors, Power Door Locks
DR LOCK Power Door Locks
PWR WDO Power Window Circuit Breaker
UNLOCK Power Door Lock Relay
IGN 0 PRND321 Display, Odometer,
VCM/PCM
SEO IGN Special Equipment Option, Ignition
SEO ACCY Special Equipment Option Accessory
RAP #1 Retained Accessory Power Relay
RDO 1 Audio System
RAP #2 Rear Power Windows,
Sunroof, Radio

if you do not have a owners manual here is a link\
http://www.chevyavalanchefanclub.com/resources/2002_owners_manual.pdf

try looking for a short in the wiring harness and do they run to the same fuse

you need a meter to check the system, check the fuse box ,, make sure one side of the correct location has power, which passes through the fuse and onto the desired circuit, if you have power at the fuse, follow that color wire to the next point,, if not, go the other way ,, Its a long process, But thats the way you have to do it

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the blower relay receives the voltage of the fuse 5PDC. dash fuse 7

Replace your blower motor relay. It's located under the hood on the firewall passenger side.