54 E46 diesel Boot button not working

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  1. 54 E46 diesel Boot button not working 
    #1
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    Simon Darley's Car Details
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    Hi Guys this is my first post here.
    I have the E46 318 like the title says and the boot button has stopped working. I understand this is a common fault, and the main cause which is broken wiring in the rubber gromet which I have checked and not found a problem with. I have removed the complete boot lip complete with number plate lights etc and found a little rust on the connections but nothing else. I tested the microswitch and I got sometime like 3.2volts and when pressed it goes down to 0.4volts. Not sure if this is correct or not. has anyone got any pointers they would like to share.

    Many thanks

    Simon
     
     

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    #2
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    Just an update, Ive checked the earth on the rear light clusters, Ive checked all positions of the boot lock too.
    It works fine by remote. it there any way to cut out the switch and just bridge the connections do you think, just to eliminate the microswitch.
     
     

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    lee_h's Car Details
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    You haven't locked the boot with the key have you? If it is locked with the key it will only open with the fob even if the car is open, try the key in the boot then try and open it
     
     

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    Ive opened the boot with the key and then removed it and tried the fob but nothing.
    Why do they make it so complicated that using a key disables it.
    I'm still not sure if the micro switch is faulty. Do you know if it receives 12volts or is it smaller?

    Cheers
     
     

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    #5
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    Bmw techy's Car Details
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    you can bridge the plug that connects to the grip strip, the wires for the boot micro switch, effectively all the switch does is bridge the wires and makes a connection. do this with the boot latched closed, if it opens you know the wiring is ok and its probably the micro switch
    Mr BMW Tech
     
     

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    #6
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    ok, ive tried bridging the wiring going to the switch but nothing happened this was done with the boot open though. Hopefully you can see in the picture2012-09-29 18.46.57.jpg
    So what BMW techy was saying, if I'm right is just to bridge the wiring connector that goes to the grip, but with the boot closed am I correct? is it safe to bridge with a paper clip or does it have to be a piece of wire?
    By the way voltage wise before the micro switch I get 5volts and the wire after the switch I get 2 volts. But surely if the circuit is complete I should get 0volts all the way to the component.
     
     

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