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With a digital system, a controller is located in the rear area with power leads going to the lights. A single power/control lead is run from the front of the car to the rear. This is cheaper because digital components are cheap, copper wire is expensive, making wiring looms is expensive, and installing looms is expensive, relatively speaking.
The disadvantage is that when a digital unit fails, you can't repair it on the spot: you have to replace it. If it's advisable to keep a spare, then your inventory costs have increased.
Possible failure points are:
