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

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

BORIS K

MECHANIC
836 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

Image (Click to make bigger)

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Tuesday, January 17th, 2023 AT 7:46 AM

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