brake warning

Discussion in 'Technical Troubles' started by metelmickey, May 26, 2018.

  1. metelmickey
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    metelmickey

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    my 2003 760 has now got the trifecta of death, all three brake warning lights are on, abs/dsc and the park, looking on-line the common fault is the abs pump, as the wiring in them wear out after time, had it taken off and tested not a fault on it, put it back on and the lights are on, picked it up from the garage and lights are off, drove home ( around 5 mls ) lights still off, start up to move onto the car port, lights on, now just been down to tesco's, no lights, start up and no lights, drove home still no lights, there are a few suggestions to the common faults, abs pressure switch, abs hub rings and sensors, it still drives fine and i'm taking it to germany for 6 months, but i would like to fix it as it's annoying and i like my car to work as it should. any other thoughts would be appreciated.
     
  2. Adie
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    Adie Site Supporter

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    There must be some error codes stored if you can get them read
     
  3. metelmickey
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    metelmickey

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    the code i get is 5E9B dsc return pump, witch the control ecu is on the back of the abs unit, on line they recone it could be the pump ecu or the pressure switch, i'm trying the switch first as it's a lot cheaper.
     
  4. Adie
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    Adie Site Supporter

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    A quick search for 5E9B comes back with 'DSC-sensor twist angle level not plausible'
     
  5. metelmickey
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    metelmickey

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    That's the steering angle sensor, on my code reader it comes up as dsc return pump. a few come up with the steering angle sensor, some with abs sensors, some with park brake, i will just go through all the suggestions and see what i find, i'm on holiday next week so plenty of time to play around. different people have found different fualts.
     
  6. Adie
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    Adie Site Supporter

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    Perhaps download a copy of INPA (mhhauto.com for free) to give an accurate diagnosis if you have an OBD connector
     
  7. metelmickey
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    metelmickey

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    checked the outputs on the steering sensor, 0 at straight ahead - on one side + on the other, so i think its okay, checked the brake light switch get 2.3v when pedal up and 13.5v with it down so ordered switch ( only £5 ) and while i have the car on the drive i will remove the wheels and check and clean the abs sensors, also will put the new discs and pads on.
     
  8. markyboyt
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    markyboyt

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    DSC sensor twist angle is referring to the Yaw rate sensor inside the DSC sensor not the steering angle. It's the sensor that measures the rotation rate of the car.
     
  9. metelmickey
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    metelmickey

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    checked all the sensors, they all read the same, i've ordered a new pressure switch which will be fitted when it turns up, replaced the discs and pads while i had the wheels and calipers off, cleaned and checked the wiring as far as i could without a major dismantling of the body work and all is clipped where it should be and no damage to the looms, i have also ordered a dsc pump ( i know a lot of money ) which i can return if it turns out its not , ( very helpful garage and friend for a long time )
     
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  10. metelmickey
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    metelmickey

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    just had the dsc return pump fitted ( £650 for the pump, £160 for the fitment ) all warning lights off and a new MOT.
    got the pump from U.S.A. ordered and arrived in 3 days. genuine bosh not a cheap chinese knock off.
    the code 5e9b is the dsc pump on a e66, different meanings on different modals.
     

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