First make sure front and rear lights are operating 100 %. If the answer is yes, and possibly L and R are both slow, I'd say a low voltage problem , or an excessive amount of accessories are on, such as heater, rear defogger etc.
Front turn signal light on the same side is not working.
tail light lamps are bad
the turn signal switch is probably bad
change backup light 2002 cadillac deville
car door light stay on
Problem may be in the steering column turn signal not cancelling completely - try "jiggling" stalk and have assistant watch brake light
The check engine light on a 1999 Cadillac DeVille can be reset by disconnecting the battery for 30 seconds. The light will immediately come back on if the problem still exists.
To replace the tailight out of a 1998 Cadillac Deville just remove the fuse and place a new one in the light\'s bulb.
short in dash light circuit, but also check tailights. Sometimes no dash lights, AND NO TAILGHTS.
Its located on the left side of the steering wheel, on the dash board near the dimmer switch and the head light switch. The base and dhs deville do not have fog lights.
change the front shocks
I have a 98 Cadillac deville and it was not turning over. All the lights in the dash came on and it read, theft system problems car may not restart. And it didn't, I checked the ground wire from the battery and it started and has been every since. Hope this works for you as well.