High Beam Issue - Ford Mustang Forum
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post #1 of 5 (permalink) Old 09-02-2019 Thread Starter
emba129's Avatar
Joined: Feb 2013
Location: Durham
Posts: 4
High Beam Issue

I have a 2009 Mustang GT with HID headlights. I have no high beams on either side. High beam indicator works ok. high beam relay and fuse check out ok. I hear relay click when I switch them on and off.

Car only has 20kmi, so I doubt bad bulbs or HID system.

Any thoughts ?

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post #2 of 5 (permalink) Old 09-02-2019
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Location: Seattle
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If you're the original owner, I'd just try replacing the bulbs. A 10 year old car with only 20K on the odometer seems a little suspicious. How old are the HID lights? Is there power going to the lights from the relay?

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post #3 of 5 (permalink) Old 09-04-2019
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Location: Central Massachusetts
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yeah burnt out bulb is normally the most common issue and simplest solution . . . but do the HID's have normal "bulbs" that burn out, or are they different? not sure????

| 2010 GT coupe | Daily Driver with some Steeda and GT500 take-off stuff for the occasional track day
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post #4 of 5 (permalink) Old 3 Weeks Ago
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Joined: May 2012
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Had the same issue on my HIDs. No high beams. I had to add a seperate positive wire. After that done everthing worked fine.
Maybe I could help you
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post #5 of 5 (permalink) Old 2 Weeks Ago
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Joined: Jan 2009
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I went through this when I bought my 09 used. I have done extensive research. HID lights don't have a high and low beam in the conventional sense. (they don't have two elements) If they are factory HID's like mine,

(And at one point I actually had a dealer mechanic tell me they didn't put HID's on an 09) , (YES FORD DID) The high beam works by activating a shroud the moves back inside the light housing thus exposing more of the bulb to make them brighter. In my case I had no High beam indicator and it turned out to be the body module needed to be re programmed. (that fuse box near the passenger feet of the front seat) It is a smart fuse box. There are also two relays in the fuse box under the hood. So in short it should works like this. When the bright wire is energized it pulls back the two shrouds inside both light housings. You can actually hear them move if they are working.I learned a lot in the process about the wiring. But it was frustrating at times. You could just have a bad relay if the bright light indicator is working. You can check that by either just buying a new one. Or if your cheap like me. And fairly mechanical, you can find the relay, use a volt meter and see if it's getting 12 volts when you turn the bright lights on. I actually energized the other side of the relay putting 12 volts directly to my light shrouds. (So I knew they worked) I eventually took the car to a more knowledgeable dealer and had my PCM and Body module re programmed and everything worked fine. I know my terminology here is not correct. But hopefully it makes sense and helps out.
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