Originally Posted by
BrickDriver
Hi Rick,
I had a similar problem on my 2007 XC70. The driver's low beam was out and there was a warning light on the console - bulb failure, or something like that. No big deal, right? Seems like a simple thing to fix.
Mine did not blow a fuse. The bulb seemed fine.
I traced the wiring the best I could, checking that ground was to ground, that the other line was not ground back toward source, and that the resistance through the bulb was a few ohms.
After resetting/clearing the codes, when I first turned the key the light would come on and then go immediately out. This could be seen in the garage where a wall in front would show that both bulbs were on briefly, then the driver's low beam would go out.
A code reading showed that CEM-8A20 was set (Low Beam Left. Signal Too Low).
Unfortunately, the problem was the CEM. Hopefully, your's is not.
I sent it to XeMODeX and their tests showed that there was water corrosion on the head light circuit. They transferred my programming to a reconditioned unit, which I installed. Problem solved....at the cost of almost $700 USD.
The CEM is not too hard to replace. If it comes to that, you can find a video on their site which shows you how to do it. Overall, I was pleased with their service, it's just very expensive.
BrickDriver
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