2000 Hyundai Elantra heater relay

Is there any way to wire a relay to force my 2000 Hyundai Elantra heater blower motor on high when I remote start the vehicle. I would like it to just take over no matter where the blower speed switch is set. I wired a relay to my defroster with a switch so that comes on each time I remote start it. I took the heater controls apart but could not quite figure out which wire i needed to power so I stopped in fear that I might screw something up. It would be a nice to have it come on because I usually forget to set the switch to high before I exit the vehicle. The heat controls are always set fine and it doesn't matter where the direction of the airflow is going. The blower always being on would be nice though. In summer I could just turn the temp to cold and push in the A/C button. Just curious if in your tech sheet data you might be able to come up with a wire color/exact location to look for. Thanks for any help you can offer.

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Steve G

Anyone have any insight?

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Steve G

Not familiar with the HVAC systems on the Hyundai, but have you tried probong the wires behind the HVAC and seeing if there is a wire that acts like a dimmer wire ?? Not sure if there is one or not or if it's all controlled via a CM within the HVAC module ? Wouldn't hurt to see if there is a wire that reacts this way and if it does, then apply a full 12 volts to it and it should show you the money !!

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Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA

Found 5 (12) guage wires and a small 18 guage wire connected. When I grounded the 18 guage wire and the 12 guage red wire it went into High gear no matter where I had the control set too. This will work great after I wire up the relays to work from the remote starter only. I'll have to isolate the two wires with seperate relays because I lose a few settings if I have those 2 wires grounded together under normal operation. Is there a way to use diodes to isolate the 2 grounds? I have the diodes on hand but only one relay. So it would make it easier. Thanks

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Steve G

Awesome !! Let me know how it works out and also please post the wires that you used as far as colors and gauge wires used. Thanks

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Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA

Still working my weekend shift at the Bank's Data Center and havent put it all back together yet...lol. Was just wondering if you thought I should use 2 seperate relays or use one relay with a few diodes? I'm thinking if I connect a diode to each wire with the Anode facing them and the Cathode connected to the grounding output of my relay...I should get ground across both wires without backfeeding the wires to one another. Does that seem correct. I'm not too familiar with dioides but from looking at the charts on here. That's what I was gonna try when I got back to it. What do you think...will that work?

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Steve G

I like using relays to isolate power wires because they can handle alot more amperage than diodes can. It's not going to take taht much more work to isolate the two wires with relays than with diodes and you know the relays won't heat up like crazy , unlike the diodes.

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Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA

Ok, sounds good. I'll pick up another one and then I wont have to worry about it.

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Steve G

Okay Jeff here's the post you requested...

The blower knob has settings 0,1,2,3,4 and there are 6 wires in the harness coming from behind it. The colors are BLACK(always grounded), GREEN(grounded when knob it not at 0((low)), WHITE(med-low) BLUE(medium) and RED(high) which are all 12 guage wires. The 6th wire is an 18 guage GREEN with BLACK stripe wire that must activate a relay (which I can't see) for everything to even come on. I attached 2 seperate relays (as suggested) pins 87 to the 18 guage GRE/BLK wire and the RED 12 guage wire. I fused and ran pins 85 from both relays to my ACCESSORY wire. I tied both 86 pins to my negative output from the RS that supplies my ACCESSORY relay with ground when started plus added a switch in between. Tied both 30 pins to chassis ground. When I remote start the blower goes high no matter where the knob is set. When I put the key in and hit the brake the blower reverts back to whatever it is set at. All 4 settings still work fine with the key. Everything seems to work well and the wires do not heat up. In the summer, all I will need to do is turn the temp control the other way and leave the A/C button pushed in. Plus I can turn off the forced settings by flicking the switch. Thanks for the help and advice.

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Steve G