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Old 11-29-2012, 09:57 AM   #1 (permalink)
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Unhappy 2003 chevy impala no low beam or drl HELP

i have a 2003 chevy impala today the drl's and low beams stopped working for no reason i have check fuses relay under the hood and ground under drivers side head light all are good i have also check headlight switch and that is working correctly my highbeams work if i hold the lever back does anyone have any suggestions as to where i look nexts all other lights are working inside and out just no low beams and no drl's someone suggested it might be the multifunction switch but i dont wanna spend $200 on a switch if its not the culprit

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Old 11-29-2012, 12:11 PM   #2 (permalink)
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Hi: by looking at the wire dia. i would say that your DRL relay (in the under hood fuse box) might be the problem. I would take a screwdriver and tap the top of the relay first and see if the lights work, if not then it looks like the dimmer switch may be the problem (low side messing around).
You then have to check the dimmer switch for power though it before it's replaced.
the 12 volt in to the dimmer is aLight blue wire from the head light relay (inner fuse box driver side) when it goes in the wire connector it changes to ayelow wire.
the low power out of the wire connector is a BRN wire after the connector on the wire harness it changes to DRK BLUE.
There Are two fuses in the under hood fuse box 1 is the DRL fuse 15A and 2. is a Ext light fuse 10 A that need to be checked.

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Old 11-29-2012, 12:52 PM   #3 (permalink)
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More than likely it is the dimmer switch, common issue. Its safer to do the tests first so you don't buy parts you don't need, but most likely you will find its bad.

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