Fog Light Operation Changed After Programming. After the vehicle is programmed with ISTA/P 2.49.x or 2.50.x (integration level earlier than F02013-11-502), the fog lights cannot be operated when the light switch is in the parking light position. Note: The fog light operation has been changed in vehicles produced from March 2013. The fog lights cannot be operated when the light switch is in the park position. This is normal operation due to state legislative requirements that have changed; no further action is required. CAUSE Software error with ISTA/P 2.49.x and 2.50.x