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BMW Mini Cooper

 Conversion to full electric drive - fault code 5DF3

 Created by: Electric
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 Posted: Sep 5, 2019 05:10AM
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Can't help with the e-conversion, but I came across this and maybe it might help:

Clutch Switch: Technical Service Bulletins
ABS/TCS - TCS Lamp ON/Code 5DF3 Set
SI M 34 01 09

January 2009
Technical Service

Traction Control Warning Illuminated; Fault Code 5DF3 Stored

Cooper with manual transmission (R55, R56)
Cooper S with manual transmission (R55, R56)
Cooper S JCW (R55, R56)


The customer may report that the traction control warning illuminated while driving. Depending on the vehicle's equipment level, fault code 5DF3 "Interface: DME/DDE signal fault" may be stored in either the Automatic Stability Control Module (ASC) or the Dynamic Stability Control Module (DSC).


The fault code 5DF3 is set in the ASC/DSC module whenever an implausible signal is received from the Engine Control Module (DME). Therefore, it is important to check the DME fault memory when diagnosing the ASC/DSC fault code 5DF3. If the DME fault memory contains fault code 2FC1 "Clutch switch signal", then the clutch switch input to the DME should be checked. If the clutch switch is not functioning properly, continue diagnosing the clutch switch electrical circuit. If the clutch switch is operating properly, then the most likely cause of the fault is driver error. If the driver rests his or her foot on the clutch pedal while accelerating, the fault will be stored. If operator error is suspected, please inform the customer accordingly.


 Posted: Aug 28, 2019 03:01PM
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I would suspect a multiplex issue, and it can be a bear to sort.

 Posted: Aug 28, 2019 02:12PM
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Hope you didn't let the smoke out! It'll never work if you did!

"Retired:  No Job, No Money, Wife and I!  Will travel anywhere for Minis"

 Posted: Aug 28, 2019 01:31PM
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Seriously? You converted a car to fully electric and you don't know how to diagnose your electrical system? I'm having a hard time adding that up.

 Posted: Aug 28, 2019 11:07AM
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I have a 2008 Mini Copper Clubman 1.6D which I have converted to full electric drive.  The car is ready for an MOT, but I have a couple of brake warning lights on, and with a diagnostic fault code 5DF3 - Interface, DME/DDE signal fault.  I believe this is connected to a brake communication fault as I have two brake warning lights on (ABS light is not on).

I cannot find anything useful despite multiple searches.

Any suggestions are most welcome.  (I would attach a photo of the conversion is I can attach it, but unclear how to do this?)