DTC C1503 TCS/ESC Switch Error: General Description
WARNING: This page is about a different car, the 2007 Kia Sedona and 2006 Kia Sedona. However, it is still accessible from the selected car via links, so may be relevant.
The driver can deactivate ESC by pressing the ESC switch. The HECU will then activate the ESC warning lamp and deactivate ESC functions. If the ESC switch is pressed again, ESC functions are restored.