If back means brake -and abs problem you have a problem with one or both systems --check fluid level brakes hubs and abs have vehicle scanned for trouble codes the buzzer is a warning advising of problem wont be able to shut or bypass buzzer until repair made also your probably in limp mode or no run mode
There should be several ways to fix this. 1. Find the buzzer and simply disconnect it. It will probably be on a board with relays near or in a fuse box inside the car. 2.Fix the problem that gives you the warning buzzer maybe one of the ABS sensors.
3. Pull the fuse that operates this buzzer but this may cause other instruments of the car to stop working.
Scan for trouble codes
gmc envoy i had done the same wound up replacing all four wheel brake pads and light stayed off
SOURCE: Abs light . How do I fix it ?
Year model and is it a hummer noise when you drive could be a wheel bearing some model as abs sensor in the bearing
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