Specific wiring harness for retrofitting an auto-dimming interior mirror Code 249 for Mercedes Benz The interior mirror automatically dims when it detects light (e.g. rear lights) Easy installation with minimal time required Suitable for the following vehicles: Mercedes CLA-Class C/X-Series 117 Mercedes A-Class W176 Series Mercedes B-Class W246 Series Mercedes GLA-Class X156 Series Package includes: 1 x Wiring Harness