1. Use a scan tool to access (body control data) to see if there is a low beam input from the multifunction switch. This will be listed in the bcm module data and will be on or active when the low beam is in the on position.

2. Should your scan tool show its in the off position when actually in the on position,suspect a faulty multi function switch

3.Check to see if the BCM is grounding the Pink/white wire @ Pin 23 in the Brown BCM connector.

4. If the BCM is grounding the low beam relay and the lights are not coming on , replace under hood fuse block