2007 E61 Touring 2.0 diesel

Discussion in '5 Series' started by svcole, Nov 7, 2018.

  1. svcole
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    svcole

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    My 2007 E61 Touring 2.0 diesel makes a low level popping or banging after locked. If I touch the tailgate lock or split rear window lock it makes the noise again. Overnight the battery drains so starting is difficult. Three days without driving battery is flat. Had the hinge wires checked there is no problem. Auto mechanic suggested it could be module is on the way out but doesnt know which one. Any ideas?

    Steve
     
  2. The_Master
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    The_Master Site Supporter

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    Hi Steve, You probably have but just to check have you looked under the boot floor in what would be the spare wheel well? The seals can go on the tailgate and let water in - there are quite a few modules in a polystyrene tray there and they can easily be damaged by water.

    Cheers

    The_Master
     
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  3. svcole
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    svcole

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    Hi master
    Yes I did have water ingress in the boot and some even went into the polystyrene tray. I change the module which made the CPU go nuts, it was the air control unit but I don't know which other module controls the central locking or even its also in the boot. I was told its under the rear spoiler.

    Steve
     
  4. kleynie
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    kleynie WARLORD Site Supporter

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    The diversity amp is the only thing under the rear spoiler. Does the rear hatch and glass lock properly? I seem to remember on my old E61 having to change the locking mechanism on the glass opening section as I had the same thing with battery drain.
     
  5. svcole
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    svcole

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    Glass and Hatch lock fine. But if I depress either of the release levers on the glass or hatch 5 minutes after locking the car the bumping noise happens again just once. But if I wait 5 to 10 mins the bumping noise happens and I can make it do it again by trying the glass or hatch lever. I think it must be the central locking module, do you know where that is? By the way thank you for replying.

    Steve
     
  6. The_Master
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    The_Master Site Supporter

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    Hi Steve,

    I believe the Body Basic module (KBM) which controls the central locking is located behind the glovebox, each latch will have a it's own actuator. Have you checked the wiring loom for the tailgate as this is a known weak spot.

    Cheers

    The_Master
     
  7. kleynie
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    kleynie WARLORD Site Supporter

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  8. svcole
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    svcole

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    Thank for that but the wipers works fine and all the doors lock also. Nothing 'pops' open just this irritating 'popping' noise from speaks or wherever and the battery drains overnight.
     
  9. Richyroos
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    Richyroos

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    I think you may have to take it in for a diagnostic check to locate the cause of the problem. It is not a problem that I have heard anyone complain about before, but does sound as if it might be something to do with the rear speakers. As you probably know the wiring loom in the tailgate hinges is notorious for breaking the odd wire, and they do run above the loudspeakers, so it is entirely possible that a wire has broken, and when you lock the car it shorts to a speaker wire, which is what gives the popping noise. Don't ask a main dealer to fix it - they charge a fortune!! Go to a good indy or auto electrician, unless you are handy with a soldering iron!
     

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