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Hello I had the christmas tree lights come up on the dash. We managed to remove the Christmas tree lights by replacing a bunch of fuses in the engine bay, trunk, passenger footwell, and the driver side fuse box. https://fuse-box.info/mercedes-benz/...uses-and-relay. we changed many fuses and it has fixed the Christmas tree lights. we also replaced the Auxiliary battery and the main battery.
We plugged in an OBD reader and the codes were pointing to a bunch of body control module miscommunication. and a bunch of miscommunication errors. After replacing the SAM control module fuses we are still getting this communication error. the car also gave us a red warning on the dash saying the Auxiliary battery malfunction so we replaced the aux battery and that has went away.
now the issue is that the car starts fine but after sitting for a while, the lights on the car (all interior and exterior lights) start flickering and the engine fan turns on, and the high beam, green lights, and fog lights on the dash come up and when that happens I cannot start the car again or use the indicators or use anything electrical with the car meaning we have to disconnect the battery to then be able to start the car again after connecting the battery 8 hours later.
we think it could be a voltage problem or alternator problem (when we rev the car sometimes all the dash lights disappear and the car is fully functional).
car drives absolutely perfectly when operational.
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
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Malfunction see owner's manual (bulb sign)
