95 yukon hvac control wiring diagram issues

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

jonnyukon

I'm Awesome
Joined
Dec 5, 2010
Messages
149
Reaction score
7
Location
mi
Ok so I recently started having an Interment blower speed issues with the dash blower speed switch.. Sometimes the blower would just turn off and if I wiggled the blower speed switch it would work again. So I pulled the hvac unit to find that the blower speed switch has been replace already.. So I pulled out the good ol volt meter and began to check for power.. And I have power at all times on the black wire and key on power on the brown wire.. Which doesn't match any diagrams I have found ... So due to the super short wires on the two plugs that go into the hvac control I pulled the control unit out and began to check for continuity on the blower speed switch and this is where is gets really interesting ...
Brown wire into blower switch
Switch off position: yellow wire has connection
Switch on low: white wire has connection
Sw on med1: black wire has connection
Sw med2: orange wire has connection
Sw high: smaller gauge dark blue wire
This doesn't match any diagrams I have found yet..
Am I missing something ?
Nothing works on the control unit.
No blower speeds
No blend door
No vent control door
No recirculating light
No rear window defrost light
Only the ac button light will work...
Even the circuit board looks ok no melting no burn marks...
You must be registered for see images attach

Blower switch plug for wire color reference
You must be registered for see images attach
 

jonnyukon

I'm Awesome
Joined
Dec 5, 2010
Messages
149
Reaction score
7
Location
mi
Blower plug for wire reference
You must be registered for see images attach


You must be registered for see images attach
 

great white

Retirement countdown!
Joined
Jan 21, 2012
Messages
6,266
Reaction score
209
The 95 model year HVAC head is unique to 95.

You'll need a 95 wiring diagram at least...
 

jonnyukon

I'm Awesome
Joined
Dec 5, 2010
Messages
149
Reaction score
7
Location
mi
The 95 model year HVAC head is unique to 95.

You'll need a 95 wiring diagram at least...

Yea I have a Haynes manual but since the move I have not been able to find it ... I'm outta luck I guess...
 

jonnyukon

I'm Awesome
Joined
Dec 5, 2010
Messages
149
Reaction score
7
Location
mi
Does the blower switch control the control units entire power ?
 

jonnyukon

I'm Awesome
Joined
Dec 5, 2010
Messages
149
Reaction score
7
Location
mi
For reference my yellow wire coming out of the blower speed switch goes to a three wire plug on the circuit board... Not to the blower resistor
 

jonnyukon

I'm Awesome
Joined
Dec 5, 2010
Messages
149
Reaction score
7
Location
mi
I'm thinkin about getting a chilton manual.. Hopefully that's a better manual than the Hayes .. I'm not sure how this unit works ..
 
Top