Location of rfa/mod relay 2008 gran prix - Grand Prix Pontiac Cars & Trucks

Yes, the switch is the next thing to check.

https://www.google.com/search?q=2008+pontiac+grand+prix+rear+defogger+not+working

https://fuse-box.info/pontiac/pontiac-grand-prix-2004-2008-fuses-and-relays

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Go on U-tube and you can find several individuals that have videos that show step by step on how to change the heater core on your or any vehicle.

try swapping over a similar relay

that seems to be the going trend with alot of Grand Prix"s - its the hinge inside the fuel door that has rotted off

Joe, It is very likely your LOW BEAM RELAY, they are ONLY $40 Auto Zone or other parts stores. I would have wasted almost a $1000 on parts and labor if my car was not under warranty for all the labor and parts GM certified mechanics wasted replacing a computer brain and the switch on left side of steering wheel. The switch they tried to make me pay for on my second attempt to fix it but but I freaked out on them. My low beams would just go out at any time, very dangerous. This is part # info you need when you go to parts store. You need GM part # 15016745 a.k.a R6100 Mine just says R6100 on the parts box. Look at your manual for its location in fuse box under the hood. It is so simple to replace, a 4 year old could do it. There is reference made on the net by some that Parts stores may tell you the part is a blower relay but ignore that, its for the low beam. Visit this post first to make sure this makes sense to you ok. if the link does not work search "07 grand prix low beam headlights shut off intermittently?" and you will find the forum with at least 20 people who have had this issue. All 06-08 grand prix's should be recalled
http://www.topix.com/forum/autos/pontiac-grand-prix/T30BFP69UH765355Q
I hope I have helped you out.

Here is the solution and by the way it is part of the air bag,the switch location is part if the inflatable restraint steering wheel inflator module.

It means the charging system isn't working. Have the alternator and battery checked ASAP.

check relay fuse to ur blower under the hood

The upscale model is the only that i know of that has one. What model do you have?

is something under your hood unplugged have you had any one working on it lately? look for wire unplugged in eng compartment