Hello ,Im having a problem with my climate control unit
The unit does light up but is blank and no button respond or light up.

I pulled the unit today and have it sitting on my desk.

Any advice?

Thanks Sam

 

If you have the electronic controls, maybe the contacts are dirty and are overdue for their 20 year cleanup. Pick up some contact spray cleaner (Hosa D5S-6 Deoxit Contact Cleaner 5% Spray - available at Amazon.com or sweetwater.com) and follow the instructions on this jump:

http://www.corvette-guru.com/modules...post_id=122630

If you have some spray CRC 05101 QD Electronic Cleaner on the shelf you may want to try that first and save a few bucks.

 

I tried cleaning the unit ..still doesnt work.
Im not sure where to look next.
It was working fine and then just quit.
Whatever the cc connects to maybe isnt getting power?
Any Ideas?
Thank you

 

The Control Head is powered by the AC 25 amp fuse
located in the main fuse panel passenger end/side of the
dash.

Should be 12 volts on the connector Pin 1.
Brown wire that plugs into the back of the Control
Head. 12 volts should be on the Brown wire when
the igntion switch is On.

If you see a ----- in the display that indicates
a problem communicating with the HVAC Programmer
which is bolted high up on the firewall to the right of the gas
pedal.

The HVAC Programmer gets 12 volts from the CTSY 15 amp
fuse and also the AC 25 amp fuse.

 

Thanks
Hooked
I checked brown wire and have power as well at the 15 and 25 amp fuse
I have no -----at the cc unit
I found the hvac unit under the dash (not sure what to do with it)

The vette had been sitting all winter ,when I started the car the fan was blowing
I played with the buttons and the fan quit and I couldnt restart it.

The buttons wouldnt lighting up when I pushed them.

Is there any relays I could check?

Sam

 

Here's the block diagram of the Control Head.
2nd picture is the pin out of the wires at the
back connector.

I'm not 100% sure of the wire colors at the connector,
but the pin numbers are correct.

Pin 1 Brown wire is 12 volts.
Pin 2 Black wire is Ground.
Pin 3 Red/White wire 8 volt reference from Programmer.
Pin 4 Purple wire Serial data line to Programmer.
Pin 5 Purple wire redundant Serial data line to Programmer.
Pin 6 Don't know
Pin 7 Gray/Black wire LCD lighting feed from Incandescent power driver.
Pin 8 Purple/Yellow wire Control Button LED lighting feed from Incandescent
power driver.
Pin 9 Gray wire. Back lighting.
Pin 10 Black wire is Ground.

You can verify the Incandescent Power driver is working,
by turning on the Headlights. Then turn on the fog lamps.
Does the Fog lamp LED indicator light?

If it does either the Control Head or Programmer is bad.
The GM tech would use a Tech 1 to simulate the
Control Head to isolate the problem.

If it doesn't light the Incandescent Power driver is bad.
It's a transistor mounted on a heat sink mounted on
the driver side of the steering column.

 

Thanks again Hook
Im not sure what to wish for?Bad head or programmer
The LED does light up.

 

I pulled the bose...for sony.
Hope to run the tests tomorrow
Thank You

 

Doing some tests..Hook

control head- pin 1 12v
pin 3 0v(should be 8v from programmer)
pin 2 grd
pin 10 grd

programmer d1 12v
c4 12v

c3 -continuity to pin3 on the CTL HD

Im going to pull the programmer to clean
any other ideas?
Thanks
Sam

 

After consulting with Hook on vettes I realized I had no power to PIN 3
(red n white wire) on the harness connecting to climate ctl. head unit.

I then pulled the programmer and discovered pin 4 was broken, preventing power to pin 3 of the head unit.

I bypass the pin by soldering a wire in its place

Works great now.

FYI pulling the vaccum tree off the programmer is a pain ,there is a clip
on the bolt
Once pryed off the vaccum tree can be pryed off as well

Sam

 

How long have you owned the car?

Strange that a pin would be broken.
Any signs the Programmer was ever messed with?
How's your head feeling.

Your patience and determination payed off

 

Ive enjoyed the Vette for 2years
When I started up the Vette this season..at first I heard the fan,,then It died .
Very wet climate here and some freezing ,my guess is corrision.
When I pulled the harness off the programmer,I could see a blockage in the female
end of the plug.
I had to remove the programmer out to notice a pin was missing..
Luckily I had a friend with great skills to help trouble shoot..or
I would have most likely ordered a new one
Diagram helped alot