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Mobile charging tray not working

Paul T M

By Paul T M,
in BMW 3 Series Forum

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Greydog Grand Master

Greydog

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Posted

Morning Paul

Welcome to the Forum

First point of call check the fuse diagram and fuses if that doesn't fix it then a Diagnostic Scan is needed by a Dealer £££ an Independent a Specialist or someone with a BMW capable scan tool 

A quick look at ISTA WIS shows fuses 120 and 128 are phone related

Hope this helps

Dave

Paul T M Newbie

Paul T M

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Hi Dave, thank you for your message and tips. Long story short the problem was actually with my phone. I went to my local garage and they placed their own mobile on the charging pad and it worked, unlike my phone. I tried the equivalent of control alt delete, switched the phone off and on and lo and behold it started working!! Cost: no charge. 
 

Thank you for trying to help.

Regards Paul

  • 1 month later...
Astonred Apprentice

Astonred

Posted
Posted
On 8/18/2025 at 1:22 PM, Paul T M said:

Hi Dave, thank you for your message and tips. Long story short the problem was actually with my phone. I went to my local garage and they placed their own mobile on the charging pad and it worked, unlike my phone. I tried the equivalent of control alt delete, switched the phone off and on and lo and behold it started working!! Cost: no charge. 
 

Thank you for trying to help.

Regards Paul

Hi Paul,

Out of interest does you wireless charge tray actually charge your phone?  Or does it just turn it into a small heater that get hotter than the sun, causing the phone to shut down due to overheat and put a very small amout of charge in it as mine does? 

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    1. 4

      Mobile charging tray not working

      Hi Paul, Out of interest does you wireless charge tray actually charge your phone? Or does it just turn it into a small heater that get hotter than the sun, causing the phone to shut down due to overheat and put a very small amout of charge in it as mine does?
      Astonred in BMW 3 Series Forum
    2. 9

      X3 Door locks

      Thanks Dave. That's great detailed information. You're right, we do tend to replace rather than mend (if possible) and I'm all for saving a few pennies!! This will keep me busy next week. ATB
      Paul Newell in BMW X3 Series Forum
    3. 9

      X3 Door locks

      Morning Paul I would expect a Dealership to understand the Diagnostic programme, however as they say "never Assume" As an old (very) engineer I was always taught to treat a fault as a symptom rather than the actual cause. Sadly modern thinking and diagnostics have lead to a part swapping culture quite often at the Clients cost. I would start by getting a really good electrical contact cleaner, then first disconnect the battery unplug the Footwell module (also called FRM) and clean and check all the plugs and pins, if all good put it back and repeat with the Junction box (JBE) if all good reconnect the battery carry out a diagnostic. Record any faults then clear the active faults if there are any. The screen shot below shows the cars control unit tree not shown is the JBE the Yellow and Blue lines at the top come from there, the JBE manages the 2 main communication lines. On the left 3 down is the CAS (Comfort Access System) second line at the bottom FRM (Footwell Module) third blue line is the Most bus Infotainment In the screen shot you can see the IHKA in yellow (investigation shows Aux Water Pump) far right the DDE is yellow as 2 glow plugs are not working. The control tree for your car will depend on the original build sheet for equipment but at least you can see how things are linked. As your issue is intermittent my thought process is more loose or corroded pin on one of the connection plugs on either the JBE (on the side of the fuse box) or the Footwell module Hope this helps Dave
      Greydog in BMW X3 Series Forum
    4. 9

      X3 Door locks

      Thanks again Dave. The diagnostic check was done at a main dealership so I assume it will be as you suggested. I'll call in at my local garage in the morning and run through the things you suspect could be the cause. I appreciate your help with this.
      Paul Newell in BMW X3 Series Forum
    5. 9

      X3 Door locks

      Hi Paul As the fault is intermittent it always a mission to track down, INPA/ISTA will show faults present and faults not present but recorded in the history. So if INPA/ISTA was used I would have expected the fault to be seen Many garages just clear faults then see what comes back (not helpful at times) The fact that your radio seems to be linked to the fault occurrence makes me think the issue is with either the Footwell Module or Junction Box as these modules are the ones that link the two systems (Radio is on the MOST Bus circuit Doors are I believe K-Can) Dave
      Greydog in BMW X3 Series Forum

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