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Thread: Upgrading the General Module

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    Join Date
    Oct 2004
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    Default Upgrading the General Module

    Here's a quick bit on upgrading your car's General Module.

    All E32/E34 use a centralized General Module to control most interior functions.

    Later E32/E34 cars, anything built after 9/91, have an updated module that tweaks some interior features and adds one touch down functionality for all windows. You can add these features to your early car by swapping your existing module with one from a later car.

    All US E32/E34 general modules are physically interchangeable, though there are some compatibility issues with certain cars/modules. You will run into lock functionality problems if you install a late E34 GM into an early E34 car (or a late E34 GM into an early E32, has to be from a late E32). The locking system has to match that of the donor car.

    The installation process is simple. First disconnect the battery and remove the back seat lower cushion (pull UP, hard, at the front edge).

    The rear power distribution box lives under the rear seat:



    Remove the plastic cover over the General Module and Relay Module, which is secured by three phillips screws, one is hard to see:



    With the cover removed, the GM is located on the left. Be sure your battery is disconnected before you remove it. It pulls up and out.



    Fit the replacement module and reassemble the car, reconnect the battery and enjoy!
    Last edited by Kalevera; 07-05-2010 at 06:05 PM.

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