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  1. #1
    Saab Fan
    Join Date
    11 Sep 2017
    Location
    Tbilisi, Georgia
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    11
    Saab(s)
    9-4x
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    Reverse lights do not work

    Good day all.
    My reverse lights does not work at all (both of them) as well as rear view camera. Bulbs are ok.
    When I shift to R, display shows R, side mirrors are tilting to preselected position, so I think Shift Lever selector is OK.
    Could not find separate fuses for reverse lights to check them.

    Any idea what could it be else? (9-4x, 3.0, FWD)

    Thanks in advance!

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  2. #2
    Saab Fan
    Join Date
    11 Sep 2017
    Location
    Tbilisi, Georgia
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    11
    Saab(s)
    9-4x
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    Well, diagnostics shows error: BCM can't see backup lamps. So it may be wiring problem from BCM to lams, or BCM is defective.

    Have few questions about it:

    1) when replacing BCM on SAAB 9-4x 3.0 FWD, does it need to be programmed or configured or something else other than "Plug And Play"?


    2) Is BCM from SAAB 9-5 2.0t, 2010/11 identical for my SAAB 9-4x?


    Thanks in advance!

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  3. #3
    Saab Owner Digger's Avatar
    Join Date
    28 Oct 2016
    Location
    Minneapolis Minnesota
    Posts
    547
    Saab(s)
    2006 9-3 2.0t SportCombi
    Thumbs Up:   100
    Quote Originally Posted by Saabaka View Post
    Good day all.
    My reverse lights does not work at all (both of them) as well as rear view camera. Bulbs are ok.
    When I shift to R, display shows R, side mirrors are tilting to preselected position, so I think Shift Lever selector is OK.
    Could not find separate fuses for reverse lights to check them.

    Any idea what could it be else? (9-4x, 3.0, FWD)

    Thanks in advance!
    The Saab 9-4 is basically a Cadillac SRX with Saab skin and badging. This link brings you to an older SRX, but it does come with pictures http://www.fixya.com/cars/t10976565-...ac_srx_back_up

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  4. #4
    Saab Fan
    Join Date
    11 Sep 2017
    Location
    Tbilisi, Georgia
    Posts
    11
    Saab(s)
    9-4x
    Thumbs Up:   0
    After some additional diagnostics, problem was found in BCM (Body Control Module). Wiring, bulbs and relays are ok.

    Computer processes the signal and commands the module to apply voltage to the lamps.

    BCM applies voltage to backup lamps for a very short time and then turns voltage off.
    There is no short circuit after BCM, problem is inside BCM.

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