Battery Drain / Auto Headlights Issue? - Hyundai Forums : Hyundai Forum
 
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#1 Old 10-31-2012, 05:12 PM
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Battery Drain / Auto Headlights Issue?

Hi Folks,

I own a 2004 Hyundai Sante Fe 3.5L V6. I've been experiencing some odd electrical issues lately but the most challenging is that the battery will drain and I will need to get jump-started if I leave the headlights in the "auto" setting (as opposed to "off"). The battery has been replaced and is brand new, so that is not the issue.

What will happen is, at night, I turn off the car... everything is fine. Then, in the morning, I see that the directional lights are slightly blinking (and dim), and I will open the door and see the interior dash lights are dim. Plus, for some odd reason, the CD player light will blink and there will be a sound like it is loading/unloading a CD... and the car will not start. I then need to jump it and everything is fine.

The only thing I can think of that is "on" is the "auto" mode for the headlights. However, for 8 years I've always driven in the "auto" mode and there have been no issues.

I've taken it into the dealership Cammisa Hyundai 2x for this and they have found nothing. Battery fine, connections fine, cables fine, starter fine, etc. All the diagnostics produce good results as well. Their only suggestion was to attach an additional monitor and drive for a few days and hope it happens again. This is an intermittent problem and not sure this will help.

Any ideas?

Rich B.

For those interested, the the other issue I seem to occasionally get is that the heater sometimes does not work. 95% of the time, its fine. Once in a while, heat will not work when the heat is "on" but if I turn the heat "off", heater may actually work (though it will not blow the hot air as the blower is "off"). Odd.
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#2 Old 10-31-2012, 06:09 PM
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Hi Rich B,

Had some similar issue lately. After lewaving the car at rest for some days, it would drain the battery to the point it would not start.
I started to monitor the current, drawn in rest by putting on an ampmeter in the ground line of the battery. I saw currents afetr shutdown of 200 upto 300mA being drawn, then settling down to 30 to 40 mA. Also temporary peaks of 300 mA. It varies in time. The higher current seems to come from the immobiliser unit. By undoing fuses I did find that .
However, after a little wile it comes to rest at 30 to 40 mA. I think that quit high. I coundn't find any fuse I could pull to get rid of it.
Also I monitored the battery voltage daily. After driving f.i. a level of 13.5 volts. After a day 12.9, then 12.6 then 12.3. It is going down.
I then replaced the battery for another. Current then a little less, around 20mA. Now it seems to hold its voltage better during the days.
I recharged the older battery, but now it keeps its voltage, so actually hardly an internal battery drain, like older batteries might do.
So still somewhat puzzled about it.
To your problem, I suggest you also measure the battery current at rest.
You already changed your battery. Also monitor the voltaqe at rest, but also at running engine. It might point to a lower charging voltage of the alternator. It should do some 14.4 volts at running engine, with power like headlights on, maybe AC on. If lower, you could have a problem with alternator voltage regulator or maybe loosened wires between battery and alternator. Check the strong wire and the 2 wire connector at the alternator and the 120A fuse and the 15A B+ fuse in the fusebox.
The issues with dim lighting, radio etc. all relate to a very low battery voltage, maybe less than 9 volts, and do not make any sense. They will be resolved when voltage is normal. I would stop the use of the auto lighting for a while to check things out first. Certainly the ampmeter to check current at rest.
Heater problem: check heater fuses and relays in the fusebox.
Good luck,
Paul
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#3 Old 11-02-2012, 11:11 AM
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Thanks Paul. I'll try the amp meter and do a little more testing. Fuses are all OK. So far the past 4 days with the headlights in "off" instead of "auto" position everything is fine. But I definitely don't consider it resolved just yet.
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#4 Old 11-04-2012, 06:26 PM
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Hi Rich B,
Maybe your auto light system is drawing some additional tention, so draining the battery in rest. Together with the Etacs chip and alarms, immobiliser etc.
I read some threads ago also about troubles with heater, somewhat like you describe.
It turned out to be the heater switch itself, a bit difficult to get at, but it seemed to have bad contacts, so the heater didn't function right.
Maybe it's the same at your end..
Good luck,
Paul
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