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BCM replacement?

Tiny
FILIPEKW6
  • MEMBER
  • 2003 CHEVROLET TAHOE
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 150,000 MILES
Problem with the lights inside the car. There is nothing on the counter except the check engine. The gauges are not working. The radio is not working. Blower the same. The switch to change the drive to 4x4 also does not work, the same for electric windows. The car starts and runs normally, but after turning it off and even removing the key, the car continues to run. After disconnecting the clamp from the battery, the car goes out. Fuses checked and okay, none blown.
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Saturday, March 27th, 2021 AT 3:17 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
These are all controlled by the BCM. we should check all fuses first with the key on this guide can help with the fuse locations below:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

if the fuses are good we can confirm the BCM failure by using this video. Do a CAN scan which is the future of automotive repair you can get a CAN scanner from Amazon for about $50.00. here is a video to show you how:

https://youtu.be/u-4syLc-ifQ

Here are the BCM replacement instructions as well. Check out the diagrams (below). Let us know what happens and please upload pictures or videos of the problem.
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Friday, April 9th, 2021 AT 2:02 PM

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