It is a software controlled dimmer and it's only available fi the Mk2 is in the docking sled. It's not depending on a connected dashlight cable. It works as soon as the power comes from the docking connector.

TeeMcBee
Got my Mk2! # 080000143
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TeeMcBee
[orange]Mk2, # 080000143, 40+30 GB, Tuner, Peugeot stalk hookup</font color=orange>