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Keyless Entry System On Your New Corvette

Tech Corner

Oct 21, 2009
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My 08 coupe is giving me a "FOB NOT FOUND" message and won't start at times. After about a week of phone calls, wrecker tows, and a few trips to the dealership, no one could locate any problems. Then, a few days later, I found myself locked inside the car and couldn't get out. In a panic I tried to use the OnStar, but it wouldn't work. I called OnStar on my cell phone, and they couldn't even locate my Corvette. I eventually called the dealership, and they reminded me about the manual door release on the floor. What's wrong with this car? Stanley Via the Internet

The keyless entry system on your new Corvette allows you to enter your vehicle by simply walking up to the door and pressing the door handle with the key fob in your pocket or purse. If the vehicle recognizes your fob, the door will unlock. Once inside, all you have to do is apply the brake pedal and push the start button, and your car will start. It's a wonderful concept, but with the added convenience come some inherent problems.

Vemp_1001_02_o Keyless_entry_system_on_your_new_corvette Keyless_entry_remote 2/5

The keyless access operates on a radio frequency. What you're experiencing is interference from one of the devices in your car. Normally, this is caused by your Global Positioning System, or GPS. Other devices that can cause problems are cell-phone chargers, power inverters, and computers. GM has issued a Technical Service Bulletin-TSB 08-08-47-001-that covers this problem on '05-'08 Corvettes.

The following is a simple way to troubleshoot the problem:
• Turn on the device that may be causing the interference.
• Put your fob near the device and press the Start button.
• If the DIC displays a "NO FOB DETECTED" message, that device is most likely the cause of the problem.
• Turn off the suspected device and press the Start button.
• If the "NO FOB DETECTED" message is not displayed, you've found the culprit.

If the first device is not at fault, repeat the process for all other possible sources of interference.

While we're on the subject, we should mention a few other fob problems that can occur with the '05-'08 models. Some owners have reported hearing a chiming when exiting the car, indicating that there's a fob inside, even when there isn't. Other owners have heard the fob reminder (three horn honks) when exiting the vehicle with the fob. A last concern is the occasional "NO FOB DETECTED" message on the DIC when no other problems can be found.

If you're experiencing one or more of these symptoms, you probably need to have the RCDLR (Remote Control Door Lock Receiver) module reprogrammed. The problem is that the RCDLR isn't sensing that the fob has left the car, hence the chimes and honks. Updated software will enhance the module's zone coverage and also add a two-second delay after the door closes before it checks for the fob in the interior. Your dealer should have the updated software. For the '05-'07 models, use software version 25927325; for '08s, use version 25927326.

If that's not enough fob trouble for you, there's also a customer-satisfaction campaign that addresses a defective module. This bulletin is No. 07260A, and it only affects '08 models with VINs between 85105302 and 85106987. A letter should have been sent to all owners whose vehicles were impacted.

If you're receiving the "NO FOB DETECTED" message and need to start the car, try moving the fob to different locations in the vehicle. You can also trying placing it in the fob pocket (located in the glove compart-ment) with the buttons facing to the right, and pressing the Start button. Good luck.

I recently purchased a new black '09 coupe with the navigation system. I was planning to have the windows tinted, but then I saw the following passage in the Navigation System Manual:

"Notice: Do not apply aftermarket glass tinting to the vehicle's windows. Glass tinting interferes with the system's ability to receive GPS signals and causes the system to malfunction. The window might have to be replaced to correct the problem. This would not be covered by warranty."

The problem is that I live in Arizona, and it gets very hot. Is there any tint I can use on my Corvette?
Phoenix, AZ

The majority of window tints on the market contain a metallic film, which can interfere with radio-wave signals and cause problems with several onboard systems. These include the following:

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TPMS (Tire Pressure Monitoring System): A warning lamp may illuminate on the instrument panel.

Keyless-entry system: The fob may malfunction. (Remember, the C5 and C6 keyless-entry systems share a receiver with the TPMS.)

Navigation system or satellite radio: The tint may interfere with your GPS signal. This is usually only a problem when all of the windows are tinted, along with the top strip on the windshield.

Radio: You may hear static or encounter poor reception. This seems to be more of a problem on the Malibu and Impala than it is on the Corvette.

Cell phone: You may experience poor reception or dropped calls while in your car.

That's the bad news. The good news is that there are several non-metallic films on the market, usually made from ceramic or high-quality polyester. Ceramic films are not only compatible with automotive electronics, but they can block almost three times as much heat as their metallic and polyester counterparts as well. The ceramic films do cost a little more, but they're well worth the price.

I own a '77 Corvette that's almost completely stock. I recently performed a cooling-system flush and installed straight antifreeze. Since then, I've noticed that the coolant temperature reads around 225 degrees. The temperature gauge has always read about 200 in the summer. What do you think has happened? Is this something I caused when I flushed the coolant? Help!
Via the Internet

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It sounds like you made the same mistake a lot of other DIY'ers do. The fact is that a high concentration of antifreeze does not transfer heat as well as pure water or a 50/50 mix of antifreeze and water. This could be a significant contributor to your high coolant temperature. The solution to your problem is to drain the antifreeze and go with a 50/50 mix; this should help the engine run cooler.

After you've confirmed that the correct mixture of antifreeze has resolved your overheating problem, use a hydrometer or a refractometer to confirm that the concentration of coolant will protect your engine during the winter months. Good luck, and let me know how it works out.

I own an '08 Corvette Z06 and a new Shelby GT500. My question has to do with car insurance. Specifically, is it possible to get collector-car insurance on a modern-day collectible? I do like to drive my cars, but with the demands of work and a family, I only get a chance to do so a couple times a month-and that's usually to a show or cruise-in. I also live in Illinois, where it's quite cold in the winter and keeps the cars in storage.
Via the Internet

This is a question a lot of people are asking, as today's new-car market offers more potential collectibles than ever before. For advice we turned to Gary Gandy, Vice President of Heacock Classic Collector Car Insurance. This is what he had to say:

Here at Heacock Classic, we're seeing a lot of modern-day supercars, such as the Z06 and ZR1, migrating into collections. And so the question is often asked: how can they be insured? The answer-at least for our program-is that if the cars are truly collectable and are treated as such, they can qualify for several of our Collector Car programs.

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Cars in this category would include the new Challenger, the Shelby GT500/Super Snake, and, of course, the Z06 and ZR1. The advantage for customers is they can obtain Agreed Value Coverage, rather than the more traditional Stated Value Actual Cash Value that's applied to most other new cars.

When we refer to a modern-day car leading a "collector-car life," we mean that it's driven less than 3,000 miles per year, not used for any type of daily commuting, and kept in locked, enclosed storage. The cost savings to the client is generally in the 35-to-40-percent range. Cars used more than 3,000 miles are generally better off using a standard carrier such as AAA or State Farm.

An additional reason for choosing one of our Collector Car programs is that we encourage the client to select the repair shop of his or her choice in the event of an accident. This is especially important when considering fiberglass work. We also offer coverage for newly acquired collector cars, up to $75,000. This is nice to have if you purchase a car at a show or a weekend auction. Roadside assistance is offered at $10 and covers all collector cars on the policy.

Heacock will also cover cars that are under restoration as long as they are being actively restored. We only charge one liability per policy, and it covers all vehicles on the policy. Many discounts apply for large collections. Security systems and club discounts may also apply. Our program can even provide coverage for dedicated race cars when they're away from the track. Such a policy would cover the car while it's in the trailer or paddock, as well as while it's stored in your garage or race-prep shop.

Pleasure driving is permitted, but there is an exclusion that prohibits daily commuting such as driving to work. Extra mileage endorsements can be purchased for long tours such as Route 66 or Americruse.

I hope this helps. If you have any questions, feel free to give us a call at (800) 678-5173.

Got a question for our Tech Corner expert? Just jot it down on a paper towel or a lightly soiled shop rag and send it to us at VETTE Magazine, Attn: Tech Corner, 9036 Brittany Way, Tampa, FL 33619. Alternatively, you can submit your question via the Web, by emailing it to us at Be sure to put "Tech Corner" in the subject line.



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