DD lighting issues

boonewheeler

New Member
Joined
Feb 22, 2007
Location
Boone
My daily driver is a 2000 Volvo S70 non-turbo. Its had weird electrical issues since day 1. Currently there are 4 different sets of taillights/brake lights on the car. One each on the far outsides, then one each on each side of the trunk. The sockets hold (from top to bottom) taillight, turn signal, brake light. The weird thing is that currently only my far outside tail lights work (on the fenders) and even those are intermittent. No bulbs are blown, power is getting to the socket (checked with a multimeter), and no fuses are blown.

The bulbs the owners manual is calling for are 1156s for the brake lights (21w) and 67s (5w) for the tail lights. I just noticed that the bulbs from the store are 1156s but are 26.9w. Would this cause issues? Its getting really annoying cause I can't find a solution and I've been pulled over 3 times because of this. My next step is to replace all the sockets to see if this somehow might help.

Another question is that I know older Volvos (up to mid 90s) had a bulb failure relay that would go bad and cause lighting issues, anyone know if the 2000 has this relay and if so where it is?
 
What's happening is that the computer that controls your lights is seeing the wrong resistance on the aftermarket bulbs. Your best bet is to go to Volvo to get your bulbs. They will be the correct resistance for the computer. BMW's are notorious for this. When the computer sees the wrong resistance it thinks the bulb is out and turns on another bulb as a safety feature so the vehicle is visible until it gets the correct bulb.
 
So apparently my tail/brake lights work now... Replaced a couple random fuses and probed around a little more with the multimeter and viola the fucker decides it wants to work now. I give it a week tops before they go out again but hey at lease I can get it inspected...

Thanks rattlecanpaint, if it happens again I'm going with the 21w bulb idea, the fuses cost me $.27, bulbs from the stealership would be at least $20.
 
The resistance makes sense, but I would start looking for a ground that's rusted. The old chevy trucks had a problem with it.
 
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