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May be worth getting another BCM in there.
 

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Lighting system routes through the BCM. Find the pin, test that wire while recreating the fault.
 

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Lighting system routes through the BCM. Find the pin, test that wire while recreating the fault.
That’s the 3rd thing you’ve been wrong about in 1 thread. How about you just go back to 9-5 forum instead of confusing people.
 
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Lighting system routes through the BCM. Find the pin, test that wire while recreating the fault.
Nope. BCM sends light switch position to I-bus ONLY.
UEC controls head lights and it receives light switch position from I-bus.
 

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Wow three? Amazing. Wiring diagram suggests otherwise. But you all have figured out the fault, right?
Test the BCM.
 

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What wiring diagram you read?
I read Saab WIS.
 
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