Brake Pad Sensor refuse to turn off

[kyriian]

Replaced the pad sensor (oddly, the wires was torn, most likely from when I brought the car, the monkeys at the dealer did not know that it was important.)

Anyways, got the sensor back in, plugged in no problem, but the brake pad low warning light still comes back on
I tried to reset the brake pad warning light as well, but says reset unsuccessful.

Does anyone have any idea what else it can possibly be?

[Chicane_S54]

Yes the torn wire is causing the circuit to complete. You need to replace the sensor.

[kyriian]

Originally Posted by Chicane_S54

Yes the torn wire is causing the circuit to complete. You need to replace the sensor.

I already replaced it, everything is in the right place, but it still comes back and says reset unsuccessful.

[Chicane_S54]

You need to run ISTA.

[Qsilver7]

You have two brake pad sensors (front left wheel & rear right wheel). Can’t tell from your post if you only replaced the brake pads and sensor on one axle or both axles. If you only replaced one axle and you also installed a new brake pad sensor and the wires to the sensor are also intact...but the light still comes on...did you check the condition of the brake pads and sensor on the other axle? If not, could the check control warning be due to the pads & sensor on the other axle?

[kyriian]

Originally Posted by Qsilver7

You have two brake pad sensors (front left wheel & rear right wheel). Can’t tell from your post if you only replaced the brake pads and sensor on one axle or both axles. If you only replaced one axle and you also installed a new brake pad sensor and the wires to the sensor are also intact...but the light still comes on...did you check the condition of the brake pads and sensor on the other axle? If not, could the check control warning be due to the pads & sensor on the other axle?

So the warning was only for the front axle and specifically ask for the front pads to be replaced on the idrive screen, the pads were replaced from the dealer when I got the car as a part of the safety. A cursory look shows the rear is also fine.

Though what is odd is that when you press and hold the reset switch on the dash to reset your warnings, the fronts shows in red, but the rear is also says low, most likely the mileage warning, and I cannot reset that either.

[Chicane_S54]

ISTA

[BeeMdblU]

try another sensor, maybe the new one is defective

[turboawd]

The brake sensor is just a wire embedded in the plastic. When it wears down, the circuit opens, and triggers the brake replacement message. And you won't be able to reset the brake light, if the sensor is not closing the circuit. Since you said you had ripped wires, double check for any cut wires. You could ohm meter the sensor to make sure it's closed. Or put a jumper wire in the connector to see if that allows you to reset.

[speedracerM4]

No one reads the post, just the title?

[slickgt1]

I would say that you should check fuses. Shorted wires should blow a fuse. Probably why its not resetting now what you fixed it.

[Chicane_S54]

Instead of everyone randomly guessing... you can simply run ISTA and it will tell you EXACTLY what sensor is at fault and how to fix it. A copy of ISTA and a $18 ENET cable will do all of this work for you.

[turboawd]

Originally Posted by Chicane_S54

Instead of everyone randomly guessing... you can simply run ISTA and it will tell you EXACTLY what sensor is at fault and how to fix it. A copy of ISTA and a $18 ENET cable will do all of this work for you.

There's only 2 sensors. One in front and one in rear. He needs to check both. And how is a diagnostic program going to tell you how to fix cut wires or whatnot?

[///MCollection]

If the front won't reset after a sensor change it could be an implausible signal fault stored.

If the cbs see's the pad go from a newish pad to half won (sensor wire damaged so thinks it's worn through) it can store a plausibility issue as it's not technically plausible. So may need clearing this fault.

Other thing is sometimes they get confused if your rear sensor is newish trying to reset the rears may allow you to reset the fronts. Seems to nudge the cbs along somehow

Another thought sometimes it doesn't like the parking brake on or auto hold active when trying to reset

And lastly after the car has gone to sleep it will wake up with the pads reset even after saying it's unsuccessful. And also after waking up try the reset again

I've had nightmares with cbs before and the above are something's I've tried and have worked.

[Chicane_S54]

Originally Posted by turboawd

There's only 2 sensors. One in front and one in rear. He needs to check both. And how is a diagnostic program going to tell you how to fix cut wires or whatnot?

Are you kidding me? It will tell you exactly which sensor is faulting, what to do step by step, and whether or not the wire needs to be replaced or an adaptation needs to be run. But feel free to waste time going back and forth on a web forum for days when a simple call to ISTA could tell you in 5 minutes what is wrong.

[201]

Originally Posted by Chicane_S54

Are you kidding me? It will tell you exactly which sensor is faulting, what to do step by step, and whether or not the wire needs to be replaced or an adaptation needs to be run. But feel free to waste time going back and forth on a web forum for days when a simple call to ISTA could tell you in 5 minutes what is wrong.

It was already mentioned its his front sensor and there was no calibration for sensors when I replaced mine. You seem to not know how forums work as every thread with a problem is replied with a guesstimation that can be a solution. For someone just a month ago make a thread about what the two batteries in the back are without a search you sure do sound sure of yourself now

[Arteezy]

just what i needed during quarantine

[Chicane_S54]

Originally Posted by 201

It was already mentioned its his front sensor and there was no calibration for sensors when I replaced mine. You seem to not know how forums work as every thread with a problem is replied with a guesstimation that can be a solution. For someone just a month ago make a thread about what the two batteries in the back are without a search you sure do sound sure of yourself now

I sure did it was a legit question. What does that have to do with using ISTA chief. For someone who feels they also know quite a bit about BMW's you don't seem to know a lot about ISTA and what it is used for? And what the hell is a "guesstimation" is that a Jersey thing?

Also, after asking that question none of the answers were completely correct. The second battery is specifically for the EPS system.

[201]

Originally Posted by Chicane_S54

I sure did it was a legit question. What does that have to do with using ISTA chief. For someone who feels they also know quite a bit about BMW's you don't seem to know a lot about ISTA and what it is used for? And what the hell is a "guesstimation" is that a Jersey thing?

Also, after asking that question none of the answers were completely correct. The second battery is specifically for the EPS system.

Did I come off to you as some BMW guru? Quite frankly I no nothing about cars and stay in my lane when I have nothing to contribute. All you have contributed to this thread is to come up with that OP needs ISTA 3 times for calibration on a brake sensor that doesn't exist

[turboawd]

Originally Posted by Chicane_S54

Also, after asking that question none of the answers were completely correct. The second battery is specifically for the EPS system.

electric power steering is standard on the x5, yet dual batteries is not.
Funny how you know everything.

[turboawd]

Originally Posted by 201

Did I come off to you as some BMW guru? Quite frankly I no nothing about cars and stay in my lane when I have nothing to contribute. All you have contributed to this thread is to come up with that OP needs ISTA 3 times for calibration on a brake sensor that doesn't exist

Sensor is just a piece of wire in plastic, but it needs to be calibrated! :sarcasm:

[201]

Originally Posted by turboawd

Sensor is just a piece of wire in plastic, but it needs to be calibrated!

Then I will be the first to say I was wrong. I just had 2 cars in for brake service and they did not calibrate anything other than use ista to disengage the electric brake so figured it wasn't needed