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No power on line 1044 going to A1 on radio side?

Tiny
LEESTRUCK
  • MEMBER
  • 2007 CHEVROLET SILVERADO
  • 6.6L
  • V8
  • TURBO
  • 4WD
  • AUTOMATIC
  • 258,000 MILES
I have no power when key is in any on/run position on line 1044 going to A1on the radio. I want to check the line from the BCM but do not see it on any drawings.
Tuesday, January 17th, 2023 AT 6:44 AM

2 Replies

Tiny
BORIS K
  • MECHANIC
  • 760 POSTS
Hello,

All wiring diagrams I look at show current track 340 to pin A1, red/white wire.
Constant 12V supply from fuse F43 or F41, 15A, in engine fuse block
See image below.

How to:
https://www.2carpros.com/articles/how-to-check-a-car-fuse
and
https://www.2carpros.com/articles/how-to-check-wiring
and
https://www.2carpros.com/articles/how-to-use-a-voltmeter
and
https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Cheers, Boris
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Tuesday, January 17th, 2023 AT 7:46 AM
Tiny
LEESTRUCK
  • MEMBER
  • 2 POSTS
I found what I was looking for. A1 from line 1044 goes to the SP205 turning into line 1037 going to the serial port of the BCM. Bcm should push a 12vdc once key is turned on thus providing the necessary data to turn on the radio. I will pin my line once I get some free time from work.
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Thursday, January 19th, 2023 AT 3:36 AM

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