Electrical wiring diagram for lights

Tiny
PAWEL_N
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I don't have a scan tool that can monitor the BCM inputs. I am thinking about it, but I don't know what I should choose, it is not so expensive.
When I got/received too much power from supply of front right turn signal I think that it is only BCM fault. I am not an expert, but I think it is a BCM problem. I will try to disconnect all wires, remove from the car, and fix it, go by wire which supply turn bulb.
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Sunday, December 26th, 2021 AT 6:31 AM
Tiny
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Okay, yes, I think you are correct. Clearly, I am not there looking at it with you so there is always a chance we are missing something, but I feel pretty confident that the BCM is the issue.
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Sunday, December 26th, 2021 AT 3:40 PM
Tiny
PAWEL_N
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Where is located BCM inside car? Near Passenger legs, right site?
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Monday, December 27th, 2021 AT 11:39 AM
Tiny
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It is actually on the driver's side. I attached the info below on how to replace it and then the location view of the front end.
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+2
Monday, December 27th, 2021 AT 3:47 PM
Tiny
PAWEL_N
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Thank you for your help :-)
I need to some time to fix it.
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Monday, December 27th, 2021 AT 11:53 PM
Tiny
PAWEL_N
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I don't understand it. The turn light starts working after a few days while I didn't use the car. I did nothing. But I observed that some functions don't working, like steering wheel's light, left buttons on steering wheel, volume control and programs change on steering wheel (Cruise control is working), opening the sliding Door and rear Door by kick under door. Is in BCM any thermo protection circuit which after cool down starts working? Or a fuse for some other functions?
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Tuesday, January 4th, 2022 AT 11:24 PM
Tiny
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The BCM does not have thermal protection. I suspect that this is a joint on the circuit board that is fractured, and it gets hot and opens. Then when it cools down it may make contact again.
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Thursday, January 6th, 2022 AT 8:53 AM
Tiny
PAWEL_N
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I found the issue or better issues. The turn light and the problem with the steering wheel are two independent problems.
1. The cool down BCM and normal working after restart engine is normal state for BCM. It so working after the bulb failure.
2. The disfunction of steering wheel it is LIN BUS fault. The electrcal connections for HF under left rear sliding door are faulty. There are 3 pins: +12V ACC, GND and signal for LIN. And one pin was without connection - GND. And LIN bus was unsettled. After cleaning GND connection all starts working :-)
If you observe that some function for LIN bus do not working you have to found all junctions for all LIN bus units. It is full working time.
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Thursday, March 24th, 2022 AT 4:52 AM
Tiny
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Oh wow. That LIN bus causes all sorts of issues, so I am so glad you found it and came back to update us.

Thanks, and talk to you next time.
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Thursday, March 24th, 2022 AT 6:40 AM

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