2004 Hyundai Sonata ELECTRICAL PROBLEM

aawilliams · Posted at Sat Nov 07, 2009 8:31 am

Electrical problem
2004 Hyundai Sonata 6 cyl Two Wheel Drive Automatic 103000 miles

WHENEVER I PRESS THE BRAKE PEDAL, MY DASH LIGHTS COME ON, WHEN I RELEASE THE BRAKE PEDAL, THEY GO OFF. ALSO, WHEN I TURN THE HEADLIGHT ON, THE BRAKE LIGHT THAT IS ABOVE THE TRUNK COMES ON. DOES ANYONE KNOW HOW TO FIX THIS PROBLEM?

KHLow2008 · Posted at Sat Nov 07, 2009 9:42 am

Hi aawilliams,

Thank you for the donation.

Symptoms indicates a possible bad ground connection for the rear ligghts in trunk.

Check the ground connections at left rear of luggage compartment under trim panel.

Was any repairs carried out or damages to body parts prior to this occurring?

aawilliams · Posted at Sat Nov 07, 2009 3:17 pm

No repairs, only a new battery installed and brakes lights were changed because they went out.

KHLow2008 · Posted at Sat Nov 07, 2009 6:53 pm

The taillights and brake lights share a common ground and uses the same bulb with different circuit. If the ground is bad, any power from the brake circuit would not ba able to ground and the current would be drawn to the next ground of the lighting circuit thus causing the two circuits to be combined. Likewise operating the lighting causes the same conditions.

Recheck the brake lights that were replaced. Try unplugging each bulb and retest. There is a possibility the bulb replaced was not seated correctly. Check the bulb seats for crossed installation ( pluggin bulbs with hook type contacts tends to have the seats goout os position causing the problem if not correctly installed.