BCM replacement?

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.

1 Reply

KEN L

MASTER CERTIFIED MECHANIC
47,643 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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