BMW 1-Series Forum (F20) 135i - 1Addicts.com > Second Generation 1 Series Forum > 2012 BMW 1-Series Sporthatch (F20) Discussion > Head Unit A42*1B Pin 13 Wiring Diagram Wanted
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      02-20-2024, 06:43 AM   #1
sailorbob
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Head Unit A42*1B Pin 13 Wiring Diagram Wanted

Does anyone have the wiring diagram for pin 13 on the A42*1B head unit connector (HU_CIC, HU_HIGH, HU_NBT and HU_NBT_EVO)? It is listed as an output and called the 'Radio on signal'.

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      04-01-2024, 07:44 AM   #2
sailorbob
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It goes via connector X70*1V to:

pin 10 on the A37*1B HiFi amplifier.
pin 10 on the A233*1B Active Sound Design unit
pin 3 on the E67*1B noise suppression filter for the A122 aerial diversity

This suggests it's a signal used to switch the other units on.
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