Dealing with a 330 LHW00480 that had low batteries. Master on, ignition knob on, entered passcode, pushed start button, clicked once and screen went black. Tried jumping but screen still black and wouldn’t boot up. Put new batteries in it and still the same. Main power and main engine relay not getting signal. I jumped 87-30 on main power and the screen boots up, hvac and stereo come on but passcode doesn’t work and reads 0 hours so assuming it’s not communicating with the engine ecm. Getting ready to dive into schematics but was wondering if anyone had come across this before? Thanks for any help.
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