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2008 Trailblazer HVAC not working Viper 4706v

Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=142375
Printed Date: December 07, 2021 at 12:20 PM


Topic: 2008 Trailblazer HVAC not working Viper 4706v

Posted By: zsoccerdude17
Subject: 2008 Trailblazer HVAC not working Viper 4706v
Date Posted: January 05, 2017 at 9:17 PM

I installed a Viper 4706 V on my parents trailblazer a few weeks back. I noticed the HVAC was not working at all with the orange acc wire from the viper going to the orange acc wire in the blazer side. So I then spliced it into the brown on the blazer side as well. Still nothing. What am i missing here?? Wipers do not work either, which makes me think the orange acc wire from the viper isnt supplying power to it? Do I need to turn Acc1 on with the LCD remote?? Kind of at a loss here.



Replies:

Posted By: smokeman1
Date Posted: January 05, 2017 at 9:48 PM
You could test the output of the Orange wire from the 4706 to see if there is any voltage on it.

Do you have the Red, RED / Black, and RED / White fused wires from the heavy gauge wire harness connected to a 12 volt source?

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Posted By: Mark Mizenko
Date Posted: January 05, 2017 at 10:24 PM
2 ignitions and 2 accessorys on that vehicle, you powering both?




Posted By: zsoccerdude17
Date Posted: January 05, 2017 at 10:45 PM
I didnt see a strait forward ACC2 wire in the big wiring harness on the viper, so i used orange and ran it to both. And yes i do believe I have both ignitions connected. I know I left one of the reds and/or one of the pinks disconnected, I used the Directech install guide, if that helps anything.




Posted By: chev104275
Date Posted: January 06, 2017 at 4:59 AM
Never splice circuits together. They are separate for a reason. Can you list all your connections for us. So we can get a better picture of what's going on.

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If i Can't Install it    I Don't need it   Joe




Posted By: kreg357
Date Posted: January 06, 2017 at 6:44 AM
On the 4706, the thin Red and the thick Red, RED / White and RED / Black all must go to +12V constant power.

You can use the Vipers thin Orange (-) 200mA Accessory output to control an external relay for the ACC2 circuit. Relay wiring
Relay Pin 85 to Viper thin Orange (-) 200mA Accessory
Relay Pin 86 and 87 to +12V constant through 20 Amp fuse
Relay Pin 30 to Brown ACC2 wire
Relay Pin 87a not used - insulated

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Soldering is fun!




Posted By: zsoccerdude17
Date Posted: January 07, 2017 at 5:00 PM
Ive got it in the shop right now, and the RED / black and pink/black are not hooked up. So I will get that R/B to 12v constant and see how that helps




Posted By: zsoccerdude17
Date Posted: January 07, 2017 at 5:05 PM
That did the trick! Now I'm going to unsplice the 2 ACC wires and just power one. If I want HVAC this should be the brown wire correct?




Posted By: zsoccerdude17
Date Posted: January 07, 2017 at 5:28 PM
For future reference that is wrong. Brown is wipers and such. Orange is HVAC and defrost.




Posted By: Mark Mizenko
Date Posted: January 07, 2017 at 9:10 PM
We know that ;)




Posted By: zsoccerdude17
Date Posted: January 07, 2017 at 9:14 PM
Somebody on here must not, because thats where I found a referance to the brown wire being HVAC.




Posted By: zsoccerdude17
Date Posted: January 07, 2017 at 9:15 PM
Its whatever though, live and learn. I appreciate all the information here. Very helpful.




Posted By: zsoccerdude17
Date Posted: January 08, 2017 at 12:18 PM
Now Ive got another issue,the remote start will shut off after slighlty more than 2 minutes. My flashes from my led diagnostics go 11-11-11-5-11-5-11-11. Not really sure how to interprit that. This dod not happen prior to hooking up the RED / black




Posted By: zsoccerdude17
Date Posted: January 08, 2017 at 12:39 PM
I think i understand the flashes as a history of why the remote start shut down, so my current shutdown status would be 11. 11 Being Wait-to-start input timed out, idk why I would be getting that error??




Posted By: zsoccerdude17
Date Posted: January 08, 2017 at 11:53 PM
Any insight on this issue? Just not sure how it went from working fine. to doing this overnight.




Posted By: kreg357
Date Posted: January 09, 2017 at 4:16 AM
First, I would double check all the connectors to ensure they were completely seated.
Next, I would make sure my Viper to Chassis Ground connection was perfect. Use a soldered-on terminal ring and fasten to a solid, paint and rust free metal frame area.

Does your 2008 Blazer have "one touch starting"? That is where you can quickly turn the key to START and release it back to RUN
and the ECM will control the starter crank time and start the engine.

If yes, are you running the Viper in Tach or Virtual Tach Mode? If yes, try switching over to Engine Checking = Fixed and go with
a one second crank time. See if that helps.

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Soldering is fun!




Posted By: zsoccerdude17
Date Posted: January 21, 2017 at 12:34 PM
Checked my connections, they are solid. I am currently running off virtual tach. Im not sure how to change cranking time?




Posted By: zsoccerdude17
Date Posted: January 21, 2017 at 12:48 PM
found it in my instruction sheet, i set engine checking to off. same thing. Shuts off around 10 or 11 minutes left . Timer is set at 12 minutes




Posted By: zsoccerdude17
Date Posted: January 21, 2017 at 1:15 PM
I should also note. This is a factory refurb unit.





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