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Old 10-10-2015, 01:44 AM   #1
Darth Sleader
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Member#: 293322
Join Date: Sep 2011
Vehicle:
2008 WRX Sedan
Dark Gray Metallic

Default Heated windshield (wiper de-icer) install- HELP?

Hi All,

I have an 08 WRX. I really missed the cold weather package features I had in my previous Outback, so I decided to install them in my WRX.

I did the heated seats a few years ago and the heated side mirrors last weekend.

My windshield was badly cracked, so I decided to buy a windshield with the wiper de-icers. Research showed me that the wiring is already in place, but that a relay is needed. I've had the windshield installed and got the relay in today. I am certain that it's the correct relay, and in the correct port.

Unfortunately, I'm not getting any power to the windshield heater. I have tested my mirrors, and I'm seeing 12v. The windshield, nothing.

Another thread mentioned the possibility of having to activate the feature in the CPU.

Does anyone have any ideas for me? I believe I have all the right hardware...

Thanks in advance!

Jer
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Old 10-11-2015, 10:25 PM   #2
byastremski
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Member#: 373005
Join Date: Nov 2013
Chapter/Region: Tri-State
Location: Rochester
Vehicle:
2014 wrx 5dr
white

Default

This is a little off topic.

Is there a separate harness missing on the base model wrx's that the premium and limited with the all weather package get? I too am considering getting the glass w/ the deicers built right in and wiring everything up.

Did you just use a set of those ebay heated seat elements when you did yours?
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Old 10-11-2015, 11:56 PM   #3
Darth Sleader
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2008 WRX Sedan
Dark Gray Metallic

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Yes, I used eBay seat heaters. Getting the seats out and apart is quite a job, but there's nothing too terribly difficult overall. I used factory switches, which took some pretty serious testing and splicing to make work, but they've worked great for years.

Heated windshield:

No, no additional wire harness is missing as far as I know. I believe everything is in place, except for the windshield heater itself and the relay ($12).

I believe mine hasn't worked yet because it hasn't been cold enough. The manual says it will turn off if the temp is over 41F. This weekend it was 80. Lol. Waiting to test...

JS
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Old 10-16-2015, 01:35 PM   #4
Darth Sleader
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2008 WRX Sedan
Dark Gray Metallic

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FIXED.

Here's the answer:

The dealer needs to access the car's computer and turn the wiper de-icer function on. There are two settings to check. One chooses between "normal" (timed) operation and "continuous" operation. Further down the menu there is a setting for whether to "support" the de-icer feature, which defaults to OFF. Once that is turned on, you're good to go!

All you have to buy is the heated windshield and a relay ($12).
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Old 12-26-2017, 01:54 PM   #5
ioTus
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Chapter/Region: NWIC
Location: Seattle, WA
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2008 2.5i hatch
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Quote:
Originally Posted by Darth Sleader View Post
FIXED.

Here's the answer:

The dealer needs to access the car's computer and turn the wiper de-icer function on. There are two settings to check. One chooses between "normal" (timed) operation and "continuous" operation. Further down the menu there is a setting for whether to "support" the de-icer feature, which defaults to OFF. Once that is turned on, you're good to go!

All you have to buy is the heated windshield and a relay ($12).
Where does the relay plug in to? Cant find any info on the fuse box diagrams.
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Old 12-26-2017, 04:15 PM   #6
Darth Sleader
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2008 WRX Sedan
Dark Gray Metallic

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The relay goes into the lower section of the fuse box under the steering column. I canít recall which slot, but your dealer will know. I just asked the parts guy to look at the diagram when I purchased the relay, and installed it myself in the parking lot.

Again, youíll have to have them program your computer to both enable the function, and choose whether itís continuous or on a timer.

JS
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Old 12-27-2017, 01:30 AM   #7
ioTus
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Join Date: Aug 2007
Chapter/Region: NWIC
Location: Seattle, WA
Vehicle:
2008 2.5i hatch
Dark Grey Metallic

Default

Quote:
Originally Posted by Darth Sleader View Post
The relay goes into the lower section of the fuse box under the steering column. I canít recall which slot, but your dealer will know. I just asked the parts guy to look at the diagram when I purchased the relay, and installed it myself in the parking lot.

Again, youíll have to have them program your computer to both enable the function, and choose whether itís continuous or on a timer.

JS
Yah, Iím a bit of a DIYíer (to the agony of my dealership), and have set everything else up to this point on my own, and also plan to reprogram the computer myself, supposing I can get at it through an OBII bluetooth interface. Hoping to find some relay diagrams / pinouts, factory service manuals or something.

Iíll ask when I drop by the dealership tomorrow and report back what I find. Thanks for the tips!

UPDATE: Here is the full relay diagram. Deicer is in the right row, 2nd from top. Now, to crack the ECU....


Last edited by ioTus; 12-27-2017 at 09:07 PM.
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Old 01-13-2018, 02:40 PM   #8
Mht980
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Member#: 336442
Join Date: Oct 2012
Unhappy

I am in the same boat. Got my windshield replaced with one with deicer, mounted a relay, checked the fuse, but the deicer doesn't seem to work. If you find a way to activate that option in the ecu, pls post it here or pm me. Impreza 2.0 S, 2009. My next trip to the dealer is in April and by then I will no longer need that function...
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Old 02-13-2019, 12:28 PM   #9
Bodrie15
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I triggered my front heated window with the rear heated window relay pretty simple to do it's already fused and is timed
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