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Old 09-22-2010, 10:34 AM   #1
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Default 2003 SLE battery replaced - now no low beams

Here'* a weird one. Just had the battery replaced two days ago. It was running like a top and then just dropped off a cliff - dead. Of course it is the expensive under the back seat model, but I just realized as I went to drive in the dark this morning that the low beams don't work. High beams are fine. I replaced the low beam lamps less than a month ago. I called the shop (guys I trust), and the manager said that the low beams have nothing to do with the battery replacement. I find this troubling and hard to believe as they were working when I brought the car in for the battery replacement.

Is he right? They are checking it out this afternoon, but I feel compelled to press them on this. Is there an unrelated system that they could have accidentally affected during the process of replacing the battery?

Fanks.
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Old 09-22-2010, 10:43 AM   #2
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I would check the relays. I just had a dead battery and tracked it to a relay for the antenna. It'* possible the relay stuck and drained the battery. Removing the battery reset the relay and now it'* dead.
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Old 09-22-2010, 10:54 AM   #3
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Well, after seven years of battery life I guess it needed replacing anyway, but your explanation is plausible as to why it just up and died overnight. I will have the relays checked and not even worry if there was any life left in that old battery. Will report back for a solution.

Thanks!
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Old 09-22-2010, 11:14 AM   #4
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Wait a minute. This is replacing a relay - I can do that. Why am I even considering bringing this to a shop? All I need to know is, where are my relays located? Hopefully under the hood...
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Old 09-22-2010, 11:29 AM   #5
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For the headlights, yes its in the underhood box

Low beams are Relay #28
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Old 09-22-2010, 11:26 PM   #6
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Yup - found all this out when I removed the fuses and relay to check. Unfortunately, they all test well, so I could not find the reason. The manual provides only the vaguest of information on the 'Twilight Sentinel.'

There is a reference in the manual to a 'main fuse box' near the battery, which is what the gang at the shop will have to look at tomorrow since they had the back seat up. I will be livid if they tell me it is something else. I'd hate to have to dump a shop after a ten year relationship.

I'm thinking that since the daytime running lights no longer come on, that perhaps they are part of a system like the radio, or the driving computer. Both were reset when the battery was replaced. Perhaps this is similar and I just don't know how to reset it.

Any other ideas?
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Old 09-23-2010, 10:35 AM   #7
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How did you test the relay?

Is there one like it in that box?

Id still swap it to see just in case,,,,internal tips could be burnt
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Old 09-23-2010, 12:15 PM   #8
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Removed and tested with a multimeter. Even put a new one in to see for sure, and the lows were still inop with the new relay. Despite being replaced in tandem no longer than a month ago, I have to suspect the bulbs are shot already. It seems to be the only explanation.
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Old 09-24-2010, 12:40 PM   #9
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Wouldn't you know, it turned out to be the headlamps I had replaced a month prior. I excluded them from my troubleshooting process as they were brand new. Before you ask, I did not touch them with my fingers when installing, I just got a couple of lemons. Something, however, blew these bulbs. I guess there is a chance the sudden battery death and the headlamps are unrelated, but who knows.
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Old 09-24-2010, 12:49 PM   #10
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Glad to see you found the problem. As many on the forum have learned, always check the obvious stuff first.

Fuses..? bahaha
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