Quote:
Originally Posted by ChrisSlicks
The diode is nice but isn't strictly required if the component has it's own input.
So your choice is run wire the length of the car and hook it in parallel to the existing switch or run it back to the BCM.
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The basic issue is the BCM has a shared multiplexed input scheme for the hatch button, the turn signal, the headlight switches, etc. So the diode prevents the system from becoming confused when multiple switches are closed.