The truck's AAM must be variant coded to activate the lights.

I would suspect that this might not cost much if done at an "A" or "B" service. During either of those services, one is already paying for the scanner to be hooked to the car. Its MUCH less work to just change menus.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician