Try this, take the steering colum cover off. Check the back of the multi function switch. Likely the ground wire is broke at the connector. I believe the ground wire is the second wire rom the top on the second row of wires. Unfortunately, the connector plugs inside the plastic houseing break and pull out. The fix isnt easy. You can either replace the entire wireing harness, or splice in some extra wire to take the strain off the plug. Good Luck
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Both the headlight switch and the BCM provide a ground, or control circuit, to the headlight relay coil circuit for manual or automatic headlamp operation. When you place the headlamp switch in the OFF position, and the ambient light sensor indicates low light conditions, the BCM energizes the headlamp relay for low beam operation. You may switch the headlights to high beam by pulling the dimmer switch handle toward you until the dimmer switch is activated. When the dimmer switch is placed in the HIGH position, the indicator lamp input to the BCM is pulled low. The BCM then sends a class 2 message to the instrument cluster in order to illuminate the high beam indicator lamp.
Low and High Beams Headlamps Inoperative ?
Replace the headlamp switch. Refer to Headlamp Switch Replacement .
Did you check the headlamp relay ? Location ,left instrument panel
yep, likely the relay. pulling the dimmer back brings Hi beam on. So check lo beam relay. You can swap relays (if you have checked they are the same) to test the diagnosis. I have also been tricked by both headlight bulbs blown, so don't forget to look at both
The headlight switch gets power for the headlights from a 50amp fuse. The fuse powers the headlight switch then the dimmer switch breaks for high and low beams. So if the high beams work, the problem may be with the dimmer switch. The dimmer switch is made into the turn signal switch on the column. You would need to check the low and high beam circuits at the switch for power.
I have had the same problem with my 2004
dodge ram 1500. I also ran a ground wire from the good headlight to
the passenger h/l. This worked for about a day. I took it to the
dealer. For a $100, they informed me that I would need a new power
modulator ( fancy name for fusebox under the hood), and a new wire to
that headlight with an estimated cost of $700. I believe the problem is
in the dimmer switch. It cost $67. I will try to install it this
weekend, and I will let you know if it works....
first check power to the headlights with a test light,you might just have bad sockets or a break in the wiring,while you have the test light in the haedlight connector wiggle all wires going to it and turn off and on your switch,if you see it the test light light up at all check where you are,also by pass relay with a paper clip and see if you get power,let me know what you find.
Are these interior lights our the headlights? If it is the interior lights, you should pull the dimmer switch and check for a bad connection especially the ground connection on the back side. If that is okay, you may need to buy a new switch. If it is the headlights, check for a bad relay.