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Old 07-27-2012, 09:34 AM   #1
Kansas_Mac
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Top Problems

Last time top was down I received "top no secure" message, raised it and lowered it again and message went away. I attempted to put the top down yesterday. Trunk opens, top retracts, but panel attached to the trunk lid does not move forward and trunk lid stays up. Top will go back up fine, but when putting top down the sequence always stops once the top has gone down in the trunk. I can hear the top motor running when the switch is pressed for down and it sounds like it has an increasing load. Any ideas what to check?
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Old 07-27-2012, 06:47 PM   #2
ccclarke
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Welcome to the XLR Forum!

This sounds a lot like a Folding Top or Front Tonneau sensor going out of tolerance and stopping the cycle since it doesn't know the position of a top component. As a result, the Rear Tonneau won't move. This isn't the only possibility, but it's a fair shot for a first look.

When a Folding Top component fails to move, the problem can often be traced to the component that should have moved right before it. In the majority of the top's electrical problems, the sensors are at fault.

The hydraulic motor will continue to run, but it will be supplying the piping to the last component that worked. Hydraulic supply is controlled via electric valves. If the Folding Top Control Switch is continuously held, the pump will eventually be commanded to stop.

The quickest way to find out is ask your local dealer to give the car a diagnostic scan (this takes less than ten minutes) which should point to the faulty component quickly and reliably. At that point you'll know if you have a bad switch, sensor, pump, valve or control module. All are electrically controlled.

You can buy sensors and install them yourself, but if they have tolerances that are significantly different than the sensor they are replacing, the system may have difficulty recognizing them.

When a position sensor (there are three, plus five switches) is replaced, the folding top must go through a Learning Cycle.

As the top is moved from one stow position to the other, and back again, (one complete cycle) the sensor values (whenever they are attached to something that moves) change. That change is recorded by the Folding Top Control Module during the Learning Cycle.

If one of the sensors malfunctions, it's value doesn't match up with the stored value, so the "brain" halts the cycle to minimize potential damage to the Folding Top. Usually, it will give off a message confirrming what you already know -the top has issues.

To do the job quickly, you need parts, manuals and test equipment. Otherwise, you would have to measure voltage, resistance or continuity by disassembling connectors. Schematics are a must.

This is why GM uses electronic diagnostic tools. The car has info moving though it on two different networks. That info is used to measure the performance of all of the XLR's systems and greatly simplifies troubleshooting.

Top repairs aren't always horribly expensive, so going to the dealer for a diagnosis might be a great opportunity for some what's next/new Cadillac brochure reading time without breaking the bank.

Some of the new user interface displays available (XTS) are amazing!

In the meantime, raise the rear decklid, and inspect the left/rear storage compartment where a lot of the roof control components reside.

1) Inspect the lower drain tube first and make sure it isn't plugged.
2) If it was, inspect for a high water mark on the inside of the storage tub walls. If so, water damage may have occured.
3) Inspect the hydraulic fluid level line on the white, translucent reservoir that sits atop the pump.
4) Inspect the connectors and wiring harnesses.

Let us know how this shakes out,

CC
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Old 08-06-2012, 10:08 AM   #3
Kansas_Mac
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Thank you for your earlier very prompt response!

Took the car in for repair and I apparently need a part that is presently out of stock. Repair order states "Found rear compartment closeout panel position switch faulty rear storage closeout panel sticking open. Adjusted overcenter linkage stops relearn position sensors and retest and order rear compartment closeout panel position switch that is on backorder, glued barrier switch into panel until new panel comes in."

Cadillac dealer has ordered a rear compartment closeout panel position switch. They have no time estimate on when the switch may be available. Repair order indicates "GM 15143316 (Spec Ord) COVER" which may be the part number. I have looked around at GM Parts Direct but it turns up nothing for that number or description.

Any idea if there is a part source my local Cadillic dealer is over looking?
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Old 08-06-2012, 02:42 PM   #4
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On gmpartsdirect's home page you can enter the PN and it will pop up -@just over $29. Glad to see they found the problem quickly for you.

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Old 08-16-2012, 08:21 AM   #5
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Thanks for your response. Part number is 15143316. I checked with my dealer yesterday, and the part remains on back order. A nation wide dealer inventory check did not turn up the part.

I just checked GMPartsDirect.com, who list the part at $29.89, so I put it in my shopping cart. When I went to check out, shipping & processing & handling charges were $282.92 for a total charge of $312.81.

I am baffled by the handling charge, and will go without rather than pay a charge like that. I have sent GMPartsDirect an e-mail asking them to confirm the handling charge.

Scott.
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Old 08-16-2012, 01:43 PM   #6
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GMPartsDirect.com has corrected the handling charge to $12.95 so I placed an order. I will post again to let readers know if the repair is successful.

Scott.
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Old 08-27-2012, 08:36 AM   #7
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GMPartsDirect contacted me today and reports the part is on back order with GM with no estimated time of availability.

Scott.
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Old 10-10-2012, 01:51 PM   #8
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Finally, local dealer was able to obtain the cover sensor yesterday. Part price was higher than GM Parts Direct at $49.66. Had the part installed today at the local dealer, no labor charge.

Thanks for the advice. This is a great forum for difficult issues.

Scott.
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