CEM 3 fault?
I've been to see a customer today with a 480, I've never worked on one before so had to do a bit of research before going.
At first he thought it was completely fried as he tried to charge it using his electric Mercedes, then he charged the battery on the car using a normal battery charger. The ignition lights came on but the starter just clicked so I jump started it with my 940 and it ran fine.
However the drivers electric window wound itself down! But won't go back up and the passenger electric window is shut luckily but won't go down. The main beam is on even with the light switch in the off position and the best bit is I have checked all the fuses have power (all at 13V with engine running) but the 30A fuse for the main beam has no power either side of the fuse! So how on earth are they on? It could be I hadn't quite got the multimeter in the correct position but I managed to check every other fuse fine so I doubt it as I checked it several times.
My thinking is the CEM 3 module is dodgy, the car is an L reg 1.7 non turbo 480 ES.
Any advice appreciated
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