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[skidmarks]

I have a 2015 c5oo the problem is all the lights operate when ignition is turned ON and while motor is running but the lights will not come off or on when using the light off/on switch above the starter button, could it be the switch? a relay? fuse? thank u

[Ows]

Have you removed the jumper cable in the headlight nacelle?
If not, that'll be your first port of call.

Though it is possible to do it from the side with bars at full left lock, it's easier to take off the headlight, and find the short length of cable which is connected to the r/h switch cluster.

Disconnect that cable at both ends, and pop those two connectors together.
The light switch should now work as normal.