Join Date: Sep 2007
Location: South Missisippi
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This is to test the circuit drivers in the module. Yes you could turn them on, but lets say what if your headlights didn't work, You could command them on this way and it would let you know that the trouble may be somewhere else besides this module. Your headlight and wiper switch do not directly control these items, the request is first sent to the BCM and then the request is relayed over the CAN network to comand the IDPM E/R to turn on the lights, wipers, turnsignals, allow start signal, cooling fans, and so on.
If you can't fix it with a hammer, you've got an electrical problem!!
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08 Pro4X, Superchips Cortex Tuned, Air box mod, Backup camera with gps, Rear Axel Tube Vent mod, Bug shield, ???