Passenger side low beam will not turn on

HARRY ELSASSER

MEMBER
2001 DODGE CARAVAN
3.8L
V6
2WD
AUTOMATIC
136,752 MILES

Low beam passenger side will not come on. All other lights work. New bulbs both sides. Pulled the FCM cleaned twice and added a little twist. Tried a new multi-function switch. So far nothing has helped. One thing I noticed the check engine light comes on with low beams and goes off with the high beams. Any guesses? Thanks for any advice. Also no codes pertaining to this issue.

5 Replies

STEVE W.

MECHANIC
13,476 POSTS

Check the ground wire from the light to the FCM. You can just jumper to ground right off the black/light green wire at the bulb socket. Next check right behind the bulb socket for power on the white/dark blue wire, it could be a bad connector right at the bulb. Have seen that multiple times. Also check at the FCM for the same voltage or lack of on that same wire. If no voltage on that wire at the FCM, replace the FCM for a faulty L-low beam driver transistor. The switch is not the issue as it simply toggles a data point in the FCM to switch beams.

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Tuesday, April 10th, 2018 AT 11:14 PM

HARRY ELSASSER

MEMBER
3 POSTS

Thank You will check this out.

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Thursday, April 12th, 2018 AT 3:54 PM

STEVE W.

MECHANIC
13,476 POSTS

Good luck, here's hoping it's just a bad connector. I find a lot of them on Jeeps and Chrysler products in general around the 1998-2004 years. Not sure if it's bad wire or the crimps were made to tight and it shears the wires enough that vibration breaks them off.

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Friday, April 13th, 2018 AT 4:54 PM

HARRY ELSASSER

MEMBER
3 POSTS

Turned out to be a open circuit between the FCM and right low beam. Ran a new wire from FCM to right side low beam. Check engine light or the you have a bulb out light staying off and the low beam is working now. Thanks Steve A. For pointing out where to look.

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Saturday, April 14th, 2018 AT 3:31 AM

STEVE W.

MECHANIC
13,476 POSTS

Good job, For some reason Chrysler had a wire issue in that time frame. I find a lot of breaks and faults with wires that visually appear fine, but are broken inside the insulation. Even in areas that don't flex much or at all.

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