Repair Mercedes Summer Opening/Convenience Feature

If this video helped help me by liking it and subscribing. Thank you!!! -mugs DIY fix 2004 Mercedes C230 summer convenience to open all windows at once by holding the unlock button on your key. Mine worked intermittently when first purchased in 2004. Past few years it worked maybe 2 times. Typical cause: door handle IR (infrared) sensor has poor soldering joints Tools needed: T20 Torx screwdriver 25-30 watt soldering iron (Radio Shack $10) Electrical solder (Home Depot $5) Heat gun (Hom