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Thread: Z4 Battery Drain - EWS Module

  1. #1
    Join Date
    Oct 2009
    Location
    Metro DC
    Posts
    3
    My Cars
    Z4 (E85)

    Z4 Battery Drain - EWS Module



    I have a parasitic drain on fuse no. 10: EWS Module.

    Does anyone know the solution?

  2. #2
    Join Date
    Jan 2015
    Location
    Timaru, New Zealand
    Posts
    1,132
    My Cars
    Two Z3 Roadsters
    How much does it draw? Is the drain still there after the car has gone into sleep mode?
    1999 2.8L Z3 Roadster,
    2000 3.0L Z3 Roadster,

    There is only one thing more pleasurable than working on a Z3, that's driving it top down on a fine day.

  3. #3
    Join Date
    Oct 2009
    Location
    Metro DC
    Posts
    3
    My Cars
    Z4 (E85)
    Quote Originally Posted by Muzz258 View Post
    How much does it draw? Is the drain still there after the car has gone into sleep mode?
    2.63 mA. Yes.

    When I pulled fuse no. 10 the drain went down to 0.62

    Does the module need to be replaced? Or, should it be bypassed; and if so, what are the consequences?

  4. #4
    Join Date
    Jan 2015
    Location
    Timaru, New Zealand
    Posts
    1,132
    My Cars
    Two Z3 Roadsters
    I would not be too worried about 2.63 mA draw. For example, a Z3 has a 40 mA draw when asleep as normal to drive unlock monitoring and clock functions etc.
    1999 2.8L Z3 Roadster,
    2000 3.0L Z3 Roadster,

    There is only one thing more pleasurable than working on a Z3, that's driving it top down on a fine day.

  5. #5
    Join Date
    Jan 2016
    Location
    Ca
    Posts
    6,981
    My Cars
    2001 525it
    .62 would be normal is there any thing else on that fuse?

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