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Thread: 645ci convertible top?

  1. #1
    Join Date
    Dec 2004
    Location
    Pittsburgh PA
    Posts
    1,377
    My Cars
    996 Turbo

    645ci convertible top?

    I have a 2004 645ci, and for some reason the top wont go down.. When i hit the button the green light comes on, and the windows drop...but the roof wont move. Its strange? Any reset? anyone have advise?

  2. #2
    Join Date
    Jul 2005
    Location
    NJ
    Posts
    1,460
    My Cars
    Alpine White 2008 M5

    Cool

    Yes, take it to the the dealership. See below and attached:

    The attachment to the SIB is a series of photos with top in various stages of opening. The dealer should be able to get it with no problem to assist in diagnosis.

    Good lock.

    SI B54 17 06
    Special Roofs November 2006
    Technical Service

    SUBJECT
    Convertible Top Does Not Completely Open or Close

    MODEL
    E64 (6 Series Convertible)

    SITUATION
    The customer may complain that either the convertible top will not completely open or close, or the convertible top appears to be completely open/closed, yet the red top operation light continues to flash and the top not locked message appears.

    Fault code A6A4, for overspeed, will typically be stored in the CVM (Convertible Top Module) when this situation occurs.

    CAUSE
    The angle of rotation sensor on the tensioning bar is reading the wrong segment.

    The sensor position segments are very close together; therefore, if the frame or the sensor itself is slightly out of position, the wrong segment may be read.

    This condition is exaggerated by temperature-induced expansion, such as when the vehicle sits in direct sun for an extended period of time.

    CORRECTION
    The angle of rotation sensor has been updated with improved tolerances for segment recognition.

    The updated parts have been produced from 8/2005.

    PROCEDURE
    In case of a customer complaint, follow the recommendations below.

    Attempt to reproduce the customer's complaint. This may require allowing the vehicle to sit in the sun to promote some degree of temperature induced expansion.

    Compare the convertible top statuses via the DIS Plus or GT1, to the known correct statuses displayed in the attachment.

    If the angle of rotation, tensioning bar, is reading the wrong segment at any position of the convertible top, proceed with procedure A or B.

    Procedure A - vehicles produced up to 8/2005:

    Replace the angle of rotation sensor with the updated part.

    Note: The part number did not change, and the updated part can be identified by a date code of August 1, 2005, shown as 1.8.05.

    Allow the car to sit in the sun with the top closed and then verify the correct operation of the top.

    If the same condition returns, follow procedure B

    Procedure B - vehicles produced from 8/2005:

    The existing sensor will need to be removed from the convertible top frame and modified.


    After removing the sensor from the frame, elongate the two upper attachment holes on the sensor cover as shown by the arrows.

    Each of these 2 holes should be elongated in the indicated direction by approximately 2-3mm using a small hand file.


    Install the sensor back onto the convertible top frame.

    Rotate the sensor clockwise about the lower, unmodified hole.

    Secure the bracket to the frame


    Check the convertible top position status and if possible, allow the car to sit in the sun to further validate the effectiveness of the modification.

    If the sensor continues to read an incorrect segment, it may need to be adjusted one or more times until it reads correct all the time.

    PARTS INFORMATION
    Part Number
    Description
    Quantity

    54 34 8 268 997
    Angle of rotation sensor – tensioning bar
    1

    WARRANTY INFORMATION
    Covered under the terms of the BMW New Vehicle Limited Warranty.

    Defect Code
    Refer to KSD


    Labor Operation:
    Refer to KSD


    Labor Allowance:
    Refer to KSD

    An additional work allowance of 4 FRUs may be added for the modification and adjustment of the sensor only when Procedure B is performed.

    This work allowance should be claimed using Labor Operation 54 99 000.
    Attached Files Attached Files

    2008 Alpine White, Portland Brown ///M5 (SMG)
    2008 Alpine White, Fox Red ///M3 (6MT)
    2008 Sapphire Black, Black 750Li

    2010 Alpine White, GT550i


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