How Car Keypad Locks Work

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Pioneered by Ford, keypads let you lock, unlock without keys

Pioneered by Ford, keypad door systems began appearing on high-end car and SUV products in the early 1980s. Ford took advantage of the then-new digital computer revolution – the automaker was one of the first to adopt digital technology for car/engine control – to add the keypad feature. Keypads may be located on the bottom of the driver’s side window from or along the driver’s side pillar. Keypads illuminate when you touch them so that you can enter codes.

How keypads work

Keypads work by generating digital code sequences. The codes are sent to the security control module, the computer that controls things like locking the doors, locking the trunk, setting and arming the alarm system and such.

The security control module accepts the code sequences, decodes them and generates the proper voltages for the door lock actuators. In turn, the voltages activate door locking and unlocking. The keypad also produces codes that will:

  • Activate memory seat features
  • Unlock the trunk
  • Activate the liftgate on an SUV
  • Lock all doors
  • Unlock all doors

Every car’s code is unique

Every car manufactured has a unique, factory-programmed code. It is stored in permanent memory so it cannot be erased or overwritten. If, however, you want to program a unique code, the keypad also allows you to set aside the factory-programmed sequence and enter your own. Once you enter the new code – the procedure is spelled out in the owner’s manual as well as online – you’re all set. If there comes a time when you need to get into your car’s lock and the customized code isn’t available, you can still use the original code. Just follow the manufacturer’s recommendations to use it.

Common keypad problems

Because of their location on the window frame or on a panel on one of your car’s body surfaces, keypads can suffer from a number of issues including:

  • Dirt contamination
  • Dust
  • Leakage
  • Short circuits
  • Open circuits
  • Sticking pushbuttons

Suffice it to say, each of the problems can cause the keypad to fail. Dirt and dust can disrupt pusbutton closure over time. At first, keypads work well because they of their complete sealing against the weather and contaminants. Over time, though, as keypad protection breaks down, dirt and dust can get into individual keys, preventing their closure. By the same token, water leaks in, around any protective shielding. Shorts and opens, while they have the same result in preventing keypad function, are different electrical failures. Short circuits can result from chafed wires touching screws or body metal while opens are non-working parts of a circuit. A circuit can go open if a part such as a diode fails. Sticking pushbuttons can fail because they stick. They are usually the result of wear.

Repairing a keypad and costs

If keypads are made correctly and properly shielded, they should last for at least 100,000 miles. If you have to replace a keypad, ask your mechanic to find you the best possible replacement for your available budget. Repairing the keypad usually involves replacing the keypad as a unit, not individual keys. It may also involve replacing a wiring loom and connectors. It could also involve swapping out various relays, solenoids and, possibly, the control module itself.


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Jose

8 years of experience
33 reviews
Jose
8 years of experience
BMW 325i - Brake Pads Replacement (Front) - Redwood City, California
I had a few mechanics from YM and _all_ of them arrived late (some even 2 hours late) , but not Jose! He arrived right on time! I gave him the keys and let him do his job. I am a curious person so I asked him a few questions about his techniques and he had no problem answering them all with detailed explanations! He did run into a problem on my car because of stripped bolts, but he literally went above and beyond and found a way to remove it. Best mechanic ever.
Lexus CT200h - Brake Pads Replacement (Front) - South San Francisco, California
Jose was on time and did a great job on my brakes. He was friendly and explained the entire process. Would highly recommend.

Augustine

11 years of experience
35 reviews
Augustine
11 years of experience
Chevrolet Equinox - Brake Pads Replacement (Front) - Rio Rancho, New Mexico
Augustine was amazing. He was the perfect example of customer service all around. While he was working, I was recommending him to my neighbors. Next time I need work, I will be requesting Augustine specifically!!!!! Please give him a raise or bonus!!!
Toyota Corolla - Brake Pads Replacement (Front) - Albuquerque, New Mexico
Mr. Sanchez showed up on time and finished replacing my rotors and break pads. He was very informative and treats your car like his own. He was very time efficient and communicated very well. I highly recommend Mr. Sanchez’s services!!!!

John

26 years of experience
552 reviews
John
26 years of experience
GMC Yukon XL 1500 - Brake Pads Replacement (Rear) - League City, Texas
I am so happy John is back. I trust him very much. He is efficient and has a tremendous amount of mechanical knowledge. He is a true asset to Your Mechanic.
Ford F-150 - Brake Pads Replacement (Front, Rear) - Alvin, Texas
I like John because he is very knowledgeable about all my vehicles. In addition he is very organized regarding how he performs his work.

Wesley

8 years of experience
45 reviews
Wesley
8 years of experience
Dodge Nitro - Brake Pads Replacement (Front) - Peoria, Arizona
Great experience. Very professional, friendly, and knowledgeable. Highly recommended and will continue to use for future work.

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