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Connecting Aux to Climate Control Buttons Pictorial


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yellow_cake 
Copper - Posts: 178
Copper spacespace
Joined: December 01, 2011
Location: Saskatchewan, Canada
Posted: December 23, 2014 at 10:44 PM / IP Logged  
Sometimes you can get lucky if your car has a (-) trigger wire for the rear defogger, heated seats, etc. But what about other features which don't have a trigger wire?
I'll show you how to tie into the momentary switch of your climate control...
I will be controlling the front window defogger using an AUX channel of my remote starter via a relay.
Here's my climate control (2000 Maxima) taken apart. There's the on/off button for the front window defogger.
Connecting Aux to Climate Control Buttons Pictorial -- posted image.
Here's the back of the circuit. The contacts of the button are circled. MAKE SURE TO TEST THE CONTACTS USING DMM. It should read no-continuity normally, and close to 0 ohms while button is pressed.
Connecting Aux to Climate Control Buttons Pictorial -- posted image.
Solder some thin (22-24 gauge) wire onto the contacts. To avoid a poor solder joint, be sure the wires don't move even a fraction while the solder is cooling; I used some "helping hands" to keep them steady.
Connecting Aux to Climate Control Buttons Pictorial -- posted image.
I used hot glue to secure the wires (prevent strain & vibration on the solder joints).
Connecting Aux to Climate Control Buttons Pictorial -- posted image.
Rather than using a large Bosch style relay, I'm using a mini circuit board relay to avoid the unnecessary bulk.
Connecting Aux to Climate Control Buttons Pictorial -- posted image.
Everything is secured using hot glue. I put a mini-connector to make removal of the HVAC control unit easier.
Connecting Aux to Climate Control Buttons Pictorial -- posted image.
Here's the final look.
Connecting Aux to Climate Control Buttons Pictorial -- posted image.
yellow_cake 
Copper - Posts: 178
Copper spacespace
Joined: December 01, 2011
Location: Saskatchewan, Canada
Posted: December 23, 2014 at 10:47 PM / IP Logged  
Wiring a Bosch style automotive relay like so:
87 - switch contact 1
30 - switch contact 2
85 - Negative AUX trigger
86 - +12V constant (fused)
kreg357 
Platinum - Posts: 7,470
Platinum spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Mobile Security and Convenience. Click here for more info.spacespace
Joined: January 30, 2009
Location: New York, United States
Posted: December 24, 2014 at 7:31 AM / IP Logged  

Great info!  Connecting Aux to Climate Control Buttons Pictorial -- posted image.  Another good use for those mini-relays.  Even had a coil quenching diode added ( Howard would be very happy ).  

There would definitely be an extra charge for that install upgrade.

Soldering is fun!
tedmond 
Gold - Posts: 4,610
Gold spaceThis member has been recognized as an authority in Mobile Security and Convenience. Click here for more info.spacespace
Joined: January 06, 2007
Location: Ontario, Canada
Posted: December 25, 2014 at 9:13 AM / IP Logged  
much easier to grab the wire at the SECU where your locks/door pins/faa/fad are.
GREEN/ red (-)
Ted
2nd Year Tier 1 Medical School
Still installing as a hobby...pays for groceries
Compustar Expert
yellow_cake 
Copper - Posts: 178
Copper spacespace
Joined: December 01, 2011
Location: Saskatchewan, Canada
Posted: December 25, 2014 at 8:48 PM / IP Logged  
kreg357 wrote:
Great info! Connecting Aux to Climate Control Buttons Pictorial -- posted image. Another good use for those mini-relays. Even had a coil quenching diode added ( Howard would be very happy ).
There would definitely be an extra charge for that install upgrade.
I love the mini relays for low current stuff.
It is time consuming (and potentially risky), so not really an option for 99% of customers... It is nice to have on my own car.
tedmond wrote:
much easier to grab the wire at the SECU where your locks/door pins/faa/fad are.
GREEN/ red (-)
Hi tedmond, the GREEN/ red @ SECU is for the rear defroster...and yes, I connected that as well Connecting Aux to Climate Control Buttons Pictorial -- posted image.
howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
Joined: January 09, 2007
Location: United Kingdom
Posted: July 29, 2015 at 12:00 PM / IP Logged  
Howard has just seen this and likes every part, full marks to you Mr. Cake
howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
Joined: January 09, 2007
Location: United Kingdom
Posted: July 29, 2015 at 12:01 PM / IP Logged  
Just seen your original post, brilliant, you've gone where no man has gone before, except maybe Kreg, Ted and myself, superb attention to detail.
yellow_cake 
Copper - Posts: 178
Copper spacespace
Joined: December 01, 2011
Location: Saskatchewan, Canada
Posted: July 31, 2015 at 3:28 AM / IP Logged  
Thank you Howard! I still remember the (not too long ago) days when you among others, were helping to answer my amateur questions!
metz35 
Copper - Posts: 458
Copper spacespace
Joined: January 13, 2003
Location: Pennsylvania, United States
Posted: December 02, 2015 at 5:00 PM / IP Logged  
yellow_cake wrote:
Thank you Howard! I still remember the (not too long ago) days when you among others, were helping to answer my amateur questions!

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