Re: Brake Lights Warning - Saab 9000 Bulletin Board - Saabnet.com
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Re: Brake Lights Warning
Posted by T. Christopher [Email] (more from T. Christopher) on Fri, 12 Sep 2008 19:54:13
In Reply to: Brake Lights Warning, ChrisJ, Fri, 12 Sep 2008 07:16:44
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Chris,
This has happened on 2 of my 9Ks and I would first check the ground as Ari says.
The pictogram measures resistance from each bulb and compares the two sides. A difference in resistance tells the pictogram that you have a bulb out. Sometimes it can be a result of using 2 different watt bulbs in the back. Sometimes it can be a bad ground. Mine seemed to happen on both vehicles when I spliced a trailer connector into the rear lights. I overcame it on the previous vehicle by using 2 different wattage bulbs and "tricking" the pictogram. It took a while to figure out and one light was always brighter in the back....But I don't stare at the back lights on my car, but I do have to stare at that pictogram.
Sorry for the lengthy post, but that is how I understand it to work. Good luck.
Tom
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