VOLVO: POSITION LIGHT/RUNNING LIGHT NOT FUNCTION. IF PARKING LIGHT BULB #4 IS NOT WORKING THE POSITION LIGHT/RUNNING LIGHT#1 ON THE SAME SIDE WILL NOT WORK. IF CEM (CENTRAL ELECTRONIC MODULE) DETECTS A DEFECTIVE BULB IT WILL SET A DTC CODE AND IT WILL ALSO SHUT OFF POWER TO POSITION LIGHT. *PE