Here’s a an instructions showing you how to install the blue DRL/head light for Mercedes Benz.
Products Link: MERCEDES C W205 GLA A GLC CLA BLUE DRL / HEAD LIGHT
1, Turn the wheel to one side, till we can use plate to open the cover

2, Use the screwdrivers to open the cover, take out the headlight module

3, Remove the original Light PCB

4, Replace the original light PCB board to the blue drl circuit PCB board

5, After the light is finished

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