Reprogramming factory feature disables convenience

Ask the Auto Doctor

Dear Doctor: I love my 2013 Cadillac XTS sedan with all-wheel-drive. However, very often after locking the car and returning to it after shopping or working, I find all four windows open. Any ideas?


Dear Ira: This convenience feature on your Cadillac is designed to lower all windows to help cool off the interior on hot days when the key fob is within range. However, a false signal picked up by the body control module causes problems. Once the body control module is reprogrammed the windows will no longer open by themselves; reprogramming will alter this feature. The reprogramming cost will range from $90 to $125, on average. The automatic window roll-down feature can be eliminated by a General Motors dealer, or a shop that has a factory GM Tech2 scan tool.

Dear Doctor: My local shop changed the oil on my low-mileage 2003 Lincoln Town Car, which has 63,000 miles. I’d like to know how to reset the “change your oil.” I cannot get the reset button to work.


Dear Mario: According to information provided to technicians through Alldata, here is the recommended procedure: You’ll turn the key to the “on” position, press and hold the mode button for 5 seconds until the reset oil light is displayed, then press and release the button 1 minute in order to reset the light. Turn the key “off” then back “on” to make sure the light has been reset. This procedure should work, and if not, then take the car to another shop. They might have an oil reset tool.

DEAR DOCTOR: My 2010 Buick LaCrosse has a knock in the rear roof when I shift into reverse gear. It happens in both extreme heat and now in the cold of winter, including even when my car is parked in the garage. The sound is “rat-a-tat, rat-a-tat, rat-a-tat.” When I shift out of reverse the noise stops. My dealer cannot find the source of the transmission knock. My concern is that something is being damaged. Can you help?


Dear James: A noise coming from the roof area could be a very thin support panel that has come loose. I recommend you get the car to a body shop for their evaluation.

Dear Doctor: I would like to know the value of my low-mileage sedan. It’s a 2011 Honda Accord with only 9,100 miles. It’s never been in an accident and it’s in excellent condition. Please help me understand it’s value and the best price to ask in a sale-by-owner.


Dear Susan: You have a very desirable car, and it’s actual worth is more than you’d find in a book value listing. I expect the actual price should be $10,500, or more. Set your asking price at $12,500 and see what offers come in.

Dear Readers: To improve your safety in winter driving I offer these tips: Wiper blades and washer fluid are critical parts of inclement winter driving. Make sure your vehicle has good quality wiper blades with a rubber coated blade frame. Also, make certain you have a good quality washer fluid that does not freeze below 32 degrees, and that it offers a cleaning additive — such as an orange color or purple color washer fluid. Never dilute the washer fluid. Another area of concern are freezing door and trunk lock cylinders, so a good lock lubrication is important. Next, lubrication of the rubber door and trunk seals if a good idea, too. Use any kind of silicone spray.

Junior Damato is an ASE-certified master technician. E-mail questions for publication to info@motormatters.biz. Mail questions with SASE to: Motor Matters, P.O. Box 3305, Wilmington, DE 19804.


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