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Unread 03-26-2011, 07:23 PM   #1
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Default Headlights not working on a Jimmy?

I was looking at a friend's 96 Jimmy...yesterday both her headlights stopped working at the same time. I checked the fusebox in cab (doesn't appear to have an underhood box) and fuses are good...I tried swapping the switch but that didn't help either. According to the Haynes schematic there's a circuit breaker somewhere on the line, but I have no idea where that's at. Would anyone (such as Lautin ) be able to tell me where the breaker is at, and if there's anything else I should check?
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Unread 03-26-2011, 08:43 PM   #2
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Unread 03-26-2011, 10:56 PM   #3
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Did you swap the dimmer over also? The power runs through the dimmer directly on the system also ground runs through the DRL(daytime running lamps) relay in the relay center. If both of those are OK then most likely cause is the DRL module which is located between the HVAC module and glove box try the first things first because a DRL module may be pricey. Also but unlikely is a bad ignition switch may not power the module to turn on but this can easily be checked just turn the high beams on if they work then the module as power. Also make sure fuse 4 and 15 are good.

Hope this helps there are no other in line breakers, relays, switches, fuses, or anything in the wiring.
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Unread 03-27-2011, 12:01 AM   #4
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Thanks! All fuses are good, highbeams do NOT work.

To check the dimmer should I just try replacing it and see what happens? And do you know off hand where the relay center is on the Jimmy?
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Unread 03-27-2011, 12:11 AM   #5
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Thanks! All fuses are good, highbeams do NOT work.

To check the dimmer should I just try replacing it and see what happens? And do you know off hand where the relay center is on the Jimmy?
Under the hood main fuse box I would think. May have a seperate pack with just relays around the firewall or fenders. Yes try the dimmer switch next but I fear it may be deeper. the DRL relay should be standard so it will probably be the same as say FP or AC relay a simple switch of the 2 will tell you if it's bad or not.
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Unread 03-27-2011, 12:25 AM   #6
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Usually the DRL is in the cabin somewhere; glovebox or under the steering column.
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Unread 03-27-2011, 12:28 AM   #7
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That's the weird thing, there is no underhood fusebox. I was at O'Reillys trying to swap the switch and the guy there wouldn't believe me that there wasn't one so he came out and looked for it too. But there's no visible underhood fusebox.
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Unread 03-27-2011, 12:43 AM   #8
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That's the weird thing, there is no underhood fusebox. I was at O'Reillys trying to swap the switch and the guy there wouldn't believe me that there wasn't one so he came out and looked for it too. But there's no visible underhood fusebox.

Correct this vehicle doesn't (wierd) although some main relay's are located under hood seperately but I'm showing the DRL relay and others are located behind glove box with the module. Location 3


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Usually the DRL is in the cabin somewhere; glovebox or under the steering column.
DRL module would be Cabin but the relay is usually with the others in this case the entire relay center is behind glove box.
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Unread 03-27-2011, 04:27 AM   #9
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That's what I meant. I know when I pulled mine out of my GP it was behind a little plastic shield in the glove box and in my GTO when I was installing my gauges it's under the column. My Jeep doesn't have one since it still has the old-school pull lever for the lights.
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Unread 03-27-2011, 05:55 PM   #10
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OK it's not the relay...and its not any of the ground wires that I could find under the hood (spent like an hour cleaning up all the grounds). I ended up telling the owner that I give up, just take it to a shop and have them diagnose it, then tell me what it is and I'll see about fixing it. I forgot how much I hate chasing electrical problems.
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