2007 Other Hyundai Models Voltage drop causes Headlights to

Tiny
R7N
  • MEMBER
  • 2007 HYUNDAI
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 22,000 MILES
I have a 2007 Hyundai Azera Limited with the Ultimate package. This vehicle has been at the dealership service department three times for a voltage drop problem. The main symtom is that all exterior and interior lights dim for about one second when reducing speed. I measured the voltage drop with an analog VOM and saw a 1.1 volt drop occur between 1050 and 1150 rpm. This occurs only when moving, never when sitting and reving up and down through this rpm range. I tested with the AC on and off and the result is the same.

On the first trip in for service the dealer said they could not duplicate the problem. They did not test using a VOM. They did replace the battery due to a low starting voltage. Lights continued to dim. At the dealer for four days this trip.

On the second visit I provided the results of my tests. They kept the car for four days and managed to fix the problem by cleaning all of the grounds. The fix was temporary because the dimming headlihts returned after 1,000 miles.

The third trip in for this problem was fustrating. They kept the car for four days again. This time they informed me that they would not be able to fix the problem, because everything is working as designed and within tolerances, per Hyundai. I also had an ABS wheel sensor replaced under warranty during this visit.

Two days later the car is once again in the shop for the same ABS problem, same wheel. They once again have had the car for four days. They say they are having a problem determing why the ABS sensor is indicating bad.

I think my first problem is with the Hyundai service department at my delear. Seems there standard repair time is four days.

Do you think the voltage drop and ABS problem are related? I think there is a speed, or rpm sensitive device causing the voltage drop.
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Thursday, May 8th, 2008 AT 1:27 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi:
Yes they could be related. If they are, it is a computer problem. And yes, there is a speed sensor, but I doubt that has anything to do with it. Also, you may want to contact Hyundai and get their district reps involved. If they can't fix a problem, let the reps know so they push to get the issue resolved.

Let me know what you find.

Joe
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Tuesday, March 3rd, 2009 AT 5:30 PM
Tiny
CKRISHER
  • MEMBER
I have a 2006 Azera and also have the same voltage drop problem causing lights to dim to a point that at times I momentarily thought the engine had died. I noticed this about six months after we bought the car new. I now have approximately 75000 miles on it and have very diligently kept it serviced by the dealer. Three times during the warranty period I had asked them about this issue and it was more or less blown off as not a problem and if they would look into it I would be picking up the tab as it was not a "problem" . Through the last year, it possibly could be my imagination, but I'm sure it's getting more pronounced and I feel that eventually I will need to deal with it. At this point I have not had any related issues as the previous post mentioned pretaining to the ABS Sensor, but I am getting a bit concerned about this symptom. Has there been any more feedback by the original poster as to how this was resolved? Does Hyundai have an inherent electrical problem they don't want to acknowledge?
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Tuesday, October 20th, 2009 AT 11:05 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
To the best of my knowledge, this isn't a common problem. However, make sure you keep the documentation from the dealer that shows the problem started before the warranty expired.
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Tuesday, October 20th, 2009 AT 11:23 PM

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