Can the rear defrost in a 2009 Impala be set to stay in the on position so it will activate automatically when the vehicle is started?


Asked by hhdomains Nov 29, 2012 at 12:33 PM about the 2009 Chevrolet Impala LT

Question type: Maintenance & Repair

I had a remote starter installed but it would be far more useful if the rear defrost would also activate
when the vehicle is started.

6 Answers

Not Active

Yes it's possible but would be a custom electrical job for a professional. They use a great deal of amperage and that's why they shut themselves off when the engine is not running , the battery would go dead very quickly

2 out of 2 people think this is helpful.

Thank you for the response. Would this require an additional interface for a remote car starter that could be added post installation?

Not Active

Ya got me on that one. Maybe somebody will know

John Saffrahn

Yes it could be added. It would be wired into the ignition power wire coming out of the remote start using a diode and a relay. You hit the remote start, the car starts, there will be an ignition wire that stays hot and once the remote start timer runs out the power will be removed from that wire. That wire will have to be cut and a diode put in so electricity can't back feed to the remote start box and then splice the relay in between the diode and the remote start box. Without the diode the rear defrosters will be stuck on every time you turn the key on because power will back feed into the remote start wire and trigger the relay. Like david said, yes and also like david said, have a pro do it. If someone says its not possible print this page out and take it to them. Anyone who is well versed in electrical will completely understand what I have written and be fully capable of carrying it out.

1 out of 1 people think this is helpful.

Thank you John. Don't worry, these are not things I even attempt. When it comes to vehicles I always go to someone who knows what they are doing. Just trying to narrow down the possibilities. One more question. The starter I have has different options for each button. For instance if you push the button and release it one event will occur but if you press and hold another event will occur. Would one of these buttons work for both starting the vehicle and activating the defrost?

John Saffrahn

Its quite possible but I'm not certain as to how yours is setup. Some are set up so you can add features like opening an electronic trunk release. If you were to figure out which wire on the box became active with that button, yes you could but it would have to stay "hot". If you tap into one that is similar to the trunk release wire then the rear defrosters would turn on for only a few seconds. If you know the make and model of your alarm you should easily be able to find all the info you need online regarding features. Let's say one of those button combinations turned on headlights, doubtful but just an example, the wire that feeds power for that would be perfect. Getting back to the other set up after thinking about it you could just tap directly into the defroster relay that is already there as long as you put a diode into the wire going to the defroster relay. If only you would have gotten the 09 with the factory installed remote start.

Your Answer

Add photo

Related Questions

  • Why wont the Gear shift lever button on 2006 chevy impala engage to move out of park? 38 answers

    My gear wont release out of park. first time it did it i pushed the brake down to the floor and it relased now it wont release at all. it starts up fine my steering wheel releases just not my shifter.

    2006 Chevrolet Impala


    Maintenance & Repair

  • 2009 Chevy Impala will only blow cold air 1 answer

    Was working fine earlier this fall but now it will only blow cold air. Blower/fan is pushing good volume of air but it will not heat up. At times it seems like it is starting to warm up but then blo...

    Chevrolet Impala


    Maintenance & Repair

  • What would make a 2009 chevy impala run hot? 3 answers

    It happened on a morning where it was 9 degrees outside. The defroster never blew out hot air, it was all cold and once the car started moving the temp hand went past the halfway mark. Looked under ...

    2009 Chevrolet Impala LS


    Maintenance & Repair

  • 2002 Impala passlock / security light problem 14 answers

    Is there a known repair for the security light/passlock problem that causes Impala and other GM products not to start for 10 to 30 minutes? If it's replacing the BCM at $500 that's fine, I just want t...

    2002 Chevrolet Impala


    Maintenance & Repair

  • 2008 Impala LS Homemade Dual Exhaust? 40 answers

    So I was thinking about rigging up my own dual exhaust. Just cutting off the exhaust where the headers meet and then using a Y pipe to break the exhaust off to each side with a muffler on each side. ...

    2008 Chevrolet Impala LS


    Car Customization

Looking for a Used Impala in your area?
CarGurus has 45,232 nationwide Impala listings starting at $170.

Search Chevrolet Impala Questions

Chevrolet Impala Experts

#1 Danny Wang
Danny Wang
Reputation 1,300
#2 Tom Demyan
Tom Demyan
Reputation 1,050
#3 FordNut
Reputation 1,020
View All

Related Models For Sale

Used Chevrolet Malibu"
1,091 Great Deals out of 56,648 listings starting at $1,500
Used Dodge Charger"
474 Great Deals out of 31,833 listings starting at $3,450
Used Honda Accord"
917 Great Deals out of 73,497 listings starting at $1,000
Used Chevrolet Camaro"
453 Great Deals out of 26,429 listings starting at $2,950
Used Nissan Maxima"
371 Great Deals out of 23,311 listings starting at $999
Used Nissan Altima"
1,116 Great Deals out of 80,635 listings starting at $1,500
Used Chevrolet Tahoe"
829 Great Deals out of 32,360 listings starting at $175
Used Toyota Camry"
1,197 Great Deals out of 85,007 listings starting at $1,517
Used Dodge Challenger"
257 Great Deals out of 18,686 listings starting at $9,169
Used Chrysler 300"
444 Great Deals out of 22,302 listings starting at $2,500
Used Ford Mustang"
656 Great Deals out of 42,225 listings starting at $1,500
Used Ford Fusion"
1,081 Great Deals out of 70,426 listings starting at $1,950
Used Buick LaCrosse"
430 Great Deals out of 17,021 listings starting at $2,450
Used Ford Taurus"
366 Great Deals out of 21,251 listings starting at $1,750

Used Cars For Sale

2015 Chevrolet Impala LT For Sale
155 Great Deals out of 4,820 listings starting at $11,990
2014 Chevrolet Impala LT For Sale
129 Great Deals out of 2,494 listings starting at $11,490
2013 Chevrolet Impala LT For Sale
120 listings starting at $8,200
2012 Chevrolet Impala LT For Sale
21 Great Deals out of 340 listings starting at $7,000