My roof and my trunk are no friends anymore ...
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Cadillac XLR Forum Discussion, My roof and my trunk are no friends anymore ... in Past Cadillac Vehicle Discussion; ...
  1. #1
    Cadillac-Sam's Avatar
    Cadillac-Sam is offline Cadillac Owners Fanatic
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    Question My roof and my trunk are no friends anymore ...

    Hi there...

    Although I tried to read every thread and the GM shop manual I bought some months ago, I'm still confused.
    Couldn't find the right answer for my problem here in the older discussions:

    The roof of my XLR opens when the button is pushed, every sequence is fine until it comes to lower the trunk lid.
    Then it stops but I can still here the motor/pump working.

    After releasing the button and depressing it again the lid goes down and locks, BUT: no "ping" from the dash
    to tell everything is ok.

    Same in the closing direction: everything working fine until it comes to lower the trunk lid then I have to
    push the roof button again and it closes and … again no ping that the sequence is completed.
    But no warning on the dashboard.

    AND the trunk won't open or close without activating roof - only manually.
    It unlocks when one of the trunk buttons is pushed, but not moving up or moving down.

    Tomorrow I will get a Tech2 from a friend and want to check what's wrong.
    Maybe any suggestions where and how to check with it?

    Thanks,
    Sammy

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  3. #2
    ccclarke's Avatar
    ccclarke is online now Cadillac Owners Connoisseur
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    Re: My roof and my trunk are no friends anymore ...

    Perform a Top Re-learn with the Tech 2 and report back if any errors show up. You may have a sensor nearly out of band range which prevents the Folding Top Control Module from reporting back with a chime at the end of a successful closing sequence. The re-learn programs the module with the sensor settings and applies a band (window) they should be reading within, since they don't always give the same resistance readings at their end-of-travel measurements.

    Once you get the Folding Top working, make a chart showing sensor counts for open/closed positions, and switch indications. The next time something goes wrong, all you need to do is compare the baseline with the new readings to quickly determine where the problem is. Usually, it's a faulty sensor. When the Folding Top fails in mid-sequence, it's usually because the last sensor reading was invalid (compared to the stored value in memory) and the control module loses track of where the top is, so it aborts the operation to prevent any damage to the top. This is explained in detail in the shop manual.

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    Re: My roof and my trunk are no friends anymore ...

    Thanks a lot. How to do the counts with the Tech2? I didn't get many chances to hold one of these in my hands ...

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    ccclarke's Avatar
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    Re: My roof and my trunk are no friends anymore ...

    The counts are displayed on the Folding Top status page; you can watch them change in real-time as the roof moves.

    If you plan to keep your XLR for a long time, it's a good investment to buy your own Tech 2 and learn how to use it. You can find cheap Chinese clones for a few hundred bucks. If you don't understand the service manual, you need to find someone who does and have them explain it to you. They aren't written for the average backyard mechanic, but aren't too difficult to figure out either.

    For top problems, (especially with the 04-05 model years) it will pay for itself with just a couple of re-learns.

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    Re: My roof and my trunk are no friends anymore ...

    Did it. Works fine again and I only relearned the closed position.
    I could only see one display with counts, saying 95.
    Thanks for your help. :-)

  7. #6
    ccclarke's Avatar
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    Re: My roof and my trunk are no friends anymore ...

    I'm glad to be of help and even happier that you were able to get the problem fixed. (Relearns are very quick and easy but can cost $150 at a dealership!)

    There are three sensors which display their movement counts: The folding top sensor, and front (flaps under the rear window) and rear (panel that extends/retract in front of the rear decklid) tonneaus. You have to look in the Folding Top sensor display windows to see and record the counts. Like I said,, it's a real time-saver to record the new counts so the next time you're having a problem you can compare the old data (when it worked) to the new data (when it doesn't)

    There are also several switches in the system that report their status:

    1. The header latch (which locks the top to the center of the windshield).

    2. The luggage barrier switch (located in the driver side upright that secures the luggage barrier to prevent items in the rear of the trunk form being crushed when the top stows).

    3. The Folding Top Switch which indicates if it's open/closed (located in the windshield header).

    4. Decklid Closed Switch

    5. Trunk Release Latch

  8. #7
    Cadillac-Sam's Avatar
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    Re: My roof and my trunk are no friends anymore ...

    Thanks, I'll check this once I got my own Tech2

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