1992 E36 325i - coupe Speedo problem

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  1. 1992 E36 325i - coupe Speedo problem 
    #1
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    smitadog's Car Details
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    Hi I'm after some advice please.
    I recently had to remove the rear subframe and diff assembley to repair the subframe mounting points which had ripped away from the car.

    So I disconnect the diff speed sensor plug and unbolt all the necessary parts to remove the rear end. Disconnect the battery and carry out all the welding etc.
    Now the car is back together I have no speedo..?
    The wires are not damaged or anything and there isn't a blown fuse.
    I've done the thing where you can press odometer trip and calibrate clocks.???(if that's wot that does)
    the clocks go to max and back down but I can't get the speedo to work..?
    Any help or tips greatly apriciated.
    Thanks John
    Last edited by smitadog; 03-08-2011 at 23:54. Reason: Added year of car to thread title.
     
     

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    #2
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    It'll be something like corroded contacts at the plug.
    I'm fairly sure you problem will be within reach of the diff, so if you can't see anything, try cleaning the contacts, or checking/replacing the wires.
     
     

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    #3
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    I've done most of that, had the plug on and of several times, sprayed with WD40, even stripped the insulation off the wires to see if there was a break or a bad bit and all ok. Had sensor out have it a clean and nothin.
     
     

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    #4
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    There is no fuse on it, but you can test it.
    Switch the igntion on, and get someone to tap one of the wires to earth.
    The needle should kick about if it is connected.

    It doesn't need a fuse because it is a highly amplified sender that makes its own voltage.
     
     

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    Yeah it does that mate if I touch the wires together etc, needle moves.
     
     

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    OK, in that case, try a new diff sender.
    The wiring is OK, so I can only guess that when it was disturbed and unplugged, it broke.
     
     

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    Yeah ok will do mate, any ideas on cost of these.?
    And where best to purchase from.?
    Thanks
     
     

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    BMW will definitely get you one, but you may find some at Eurocarparts.

    At a guess, i'd say between about 20 quid-ish
     
     

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    id pillage one from the scrappers - that should only be a few quid.

    Have you defo made sure you cleaned the contacts on the plug?
     
     

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    #10
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    Quote Originally Posted by nas80 View Post
    id pillage one from the scrappers - that should only be a few quid.

    Have you defo made sure you cleaned the contacts on the plug?
    Yeah deffo cleaned up, removed sensor and re fitted.
    Wierd how it woz fine before.
    Just got back from workin away for a bit so gonna try get a plug and sensor from a scrap yard.
     
     

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