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Power emergency brake not working?

Tiny
DIVIDES
  • MEMBER
  • 2011 BMW X5
  • 6 CYL
  • TURBO
  • 4WD
  • AUTOMATIC
  • 163,000 MILES
So, the yellow brake light is on as well as the symbol for EMF for the power brake. When I press the button there is no sound at all. I thought maybe the button is bad. Checked it with a probe and it has both power and ground. Checked with the scanner and when I press it shows that it has been applied. But still no sound whatsoever. The codes are attached, I clear them and they come back 601D, sometimes 6DDB and 6DDC together. I am leaning towards the unit itself which is around the diff in back.
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Tuesday, April 5th, 2022 AT 12:38 PM

9 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,356 POSTS
I have seen a power failure cause these codes or the actuator is out, lets test the fuses in the diagrams below here is a guide to help, I have also included the replacement instructions for the parking brake actuator which is what I would change if the fuses are good.

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

Check out the diagrams (below). Let us know what happens and please upload pictures or videos of the problem.
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Wednesday, April 6th, 2022 AT 9:05 AM
Tiny
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  • 898 POSTS
Yes, I checked fuse 10 under passenger side inside the car yesterday, as well as 129 in trunk. From my readings there isn't a 94 fuse on these cars even though the fuses related to emf are 10, 94, and 129. All fuses good. Tried to actuate the brakes via scanner still nothing. Power is good at button. The only thing have not checked is the power at the actuator.
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Wednesday, April 6th, 2022 AT 9:11 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,356 POSTS
Yep, if power is present the actuator is bad. Please let us know.
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Wednesday, April 6th, 2022 AT 9:22 AM
Tiny
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  • MEMBER
  • 898 POSTS
I cannot figure out which if the wires at the actuator plug should have power.
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Wednesday, April 6th, 2022 AT 9:24 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,356 POSTS
Here are more wiring diagrams in the images below.
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Wednesday, April 6th, 2022 AT 12:46 PM
Tiny
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  • MEMBER
  • 898 POSTS
It is definitely the u it itself. I got a new one with cables on both sides. Can I just plug it in and see if all is good before connecting the cables to the wheels? You think this would damage anything?
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Monday, April 11th, 2022 AT 8:05 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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I would connect the cables first, the computer needs to see the amperage increase to the actuators to shut them down, also it helps the computer relearn.
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Monday, April 11th, 2022 AT 9:28 AM
Tiny
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  • 898 POSTS
Thanks for your help. Replaced the unit with the cable as an assembly and all is good.
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Monday, April 11th, 2022 AT 3:40 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,356 POSTS
Nice work, we are here to help, please use 2CarPros anytime.
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Tuesday, April 12th, 2022 AT 12:25 PM

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