The 1999-2003 Sonata, 2001-2003 Santa Fe and 2003 Tiburon V6 may exhibit a very brief, slight dimming of the headlamps for only a few seconds immediately after:
The A/C compressor clutch is activated;
The rear defroster is turned on;
The HVAC fan is turned on high; or
Any other large electrical load is encountered.
In order to minimize engine RPM fluctuation, an electronic control system is utilized to gradually increase the electrical load on the generator.
This load control results in the very brief (less than 5 seconds), very slight dimming of the headlamps.
This condition does not adversely affect visibility or headlamp illumination in any manner. Some customers may notice this characteristic and may ask if this constitutes normal operation. This condition is NORMAL and does not reflect any malfunction of the electrical system. Do not attempt to repair this condition.
Courtesy of Mitchell 1.
For more information on Mitchell 1 products and services, automotive professionals can log onto the company’s website at www.mitchell1.com.