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Go Back   Hummer Forums by Elcova > Hummer H3 Discussion Forums > Technical Discussion and Customizing your H3

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Old 11-28-2006, 04:40 AM
Surfcityred Surfcityred is offline
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Join Date: Nov 2006
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Default Haunted headlight selector switch

Hi Guys. I am new here and did a web search to see if any other H3 owners are experiencing the problem I am. Here's the story:

I upgraded my headlight bulbs to a whiter, higher wattage set. They went in easy enough and then I realized that when the high beam indicator light is "on" my low beams are on. When I switch to the low beam position (indicator light "off") my high beams are on. Everything is ass-backwards. At first I thought the bulbs were bad so I switched back to my old factor bulbs. The reversed indicator light deal is the same even with my factory bulbs back in.

I know there must be some easy fix either with the selector switch, some control module somewhere or some other hocus pocus electronic reset but I have no clue what to do. I called my Hummer dealer and the service department guy gave me a bunch of double talk.

Here is an explanation of how the system works:
The headlamp relay receives battery positive voltage directly from the battery. The BCM supplies a ground signal to the headlamp relay for normal headlight operation. The BCM also supplies voltage to the beam select relay coil for high beam headlight operation. When the driver places the headlamp switch in the ON position and the dimmer switch is in the low beam position, the headlamp relay supplies current flow through the left and right low beam headlamp fuses to both low and high beam headlamps. Both low beam headlights are grounded through the beam select relay. When activated, the dimmer switch sends a ground signal to the BCM in the high beam position and a momentary ground signal in the flash-to-pass (FTP) position from G106. The BCM then energizes the beam select relay which switches the headlamp grounds from the low beam headlight bulbs to the high beam headlight bulbs illuminating the high beam headlights. With the headlights in the low beam position, the high beams may be momentarily turned ON or flashed by activating the FTP portion of the switch.

Can anybody help me out with this one?
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