rear defog light dont work - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


General GM Chat When starting new posts, please specify YEAR, MAKE, MODEL, ENGINE type, and whatever modifications you have made. Chat about all things GM (and related cars). Off-topic stuff should be in the Lounge, and all Model specific mechanical problems should be posted in the proper forum.

Reply
 
 
 
Thread Tools Search this Thread
Old 07-26-2003, 08:08 PM   #1
Senior Member
True Car Nut
Thread Starter
 
Join Date: May 2003
Location: Grand Rapids, Mi
Posts: 3,244
Thanks: 0
Thanked 0 Times in 0 Posts
L27Buick is on a distinguished road
Default rear defog light dont work

in my girlfriends grand prix her rear defog button light dont work does it have a seperate bulb i cheaked the fuses and their fine and ideas?
L27Buick is offline   Reply With Quote
Old 07-27-2003, 12:41 AM   #2
Senior Member
True Car Nut
 
Join Date: Sep 2002
Location: Chicago, IL
Posts: 2,409
Thanks: 0
Thanked 1 Time in 1 Post
acg_ssei is on a distinguished road
Default Re: rear defog light dont work

Quote:
Originally Posted by L27Buick
in my girlfriends grand prix her rear defog button light dont work does it have a seperate bulb i cheaked the fuses and their fine and ideas?
Yes, there are usually two lights in the defogger switch: one lights up the defogger symbol along with the rest of the nighttime dash lighting; the other lights to actually tell you that the defogger is On. The Defog On indicator is separate from the backlighting bulb (or LED) that lights up the little defog switch indicator (along with the rest of the dash gauges). Which one of yours is out? I'm going to assume here that it'* the Defog On light.

First, is the defogger actually working when you press the button? A defogger sucks serious juice when it'* on, and you should hear a relay click when you press the switch. If not, your problem may be that the timer/relay is not working. (Typically you get something like 10 minutes of power when you first press the button, and 5 minutes for each press after that.)

If you hear a click, and the rear window obviously does defog, and the only problem is that the little light isn't lighting up, then the switch is bad. (I doubt the actual bulb or LED itself inside the button is serviceable.) More likely, though, I think you're not getting any power into the defog circuit in the first place, so look into that. (The fact that the defogger symbol lights up with the other dashboard lights at night does not mean that the defogger itself is working.)
acg_ssei is offline   Reply With Quote
Old 07-27-2003, 01:18 PM   #3
Senior Member
True Car Nut
Thread Starter
 
Join Date: May 2003
Location: Grand Rapids, Mi
Posts: 3,244
Thanks: 0
Thanked 0 Times in 0 Posts
L27Buick is on a distinguished road
Default

well thanx for the info when i push the defog button on their is no relay switch sound so its probly the relay where would that be under the hood?
L27Buick is offline   Reply With Quote
Old 07-27-2003, 01:21 PM   #4
Senior Member
True Car Nut
 
Join Date: Sep 2002
Location: Chicago, IL
Posts: 2,409
Thanks: 0
Thanked 1 Time in 1 Post
acg_ssei is on a distinguished road
Default

Quote:
Originally Posted by L27Buick
well thanx for the info when i push the defog button on their is no relay switch sound so its probly the relay where would that be under the hood
Actually in some designs it'* built into the switch itself; others use a remote relay mounted elsewhere.

Sorry, I simply don't know where the GP has its defogger relay. Can you post the year of the car? I'm sure somebody else here can tell you.
acg_ssei is offline   Reply With Quote
Old 07-27-2003, 01:31 PM   #5
Senior Member
True Car Nut
Thread Starter
 
Join Date: May 2003
Location: Grand Rapids, Mi
Posts: 3,244
Thanks: 0
Thanked 0 Times in 0 Posts
L27Buick is on a distinguished road
Default

99 grand prix se with the 3800 series 2
L27Buick is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Rear window defog circuitry. impatient99 1992-1999 21 09-19-2014 06:02 PM
rear defog won't work ike Pontiac 5 04-06-2014 10:52 PM
2000 Bonneville rear defog timer location billybobb333 2000-2005 4 01-25-2009 02:05 PM
Rear Window Defrost / Defog Merlin 91/97 1987-1991 2 09-09-2005 09:08 AM
Rear defog? bonnevilledad General GM Chat 15 01-19-2004 01:52 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 03:49 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.