Skip the auto shop - Our mechanics make house calls
  1. Home
  2. Articles
  3. How Car Keypad Locks Work

How Car Keypad Locks Work

keypad

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.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

Insurance Requirements for Car Registration in Kentucky
The Kentucky Transportation Cabinet requires that all drivers in Kentucky carry liability automotive insurance, or “financial responsibility” in order to operate a vehicle legally and maintain vehicle...
How to Transfer a Car Title in Idaho
In order to prove ownership of a car, you must have the title. However, when a car is sold, given away or inherited, the title needs...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...

Related questions

Q: Car door stuck closed.

Hello, I assume you have tried manually unlocking the door at the pull knob or at the knob above the door handle. If all that fails your door lock may be stuck and will require removing the door panel in...

Q: Doors do not lock/unlock with keyfob buttons

I would recommend going to your local auto parts store to test your vehicle's key fob. Most auto parts stores have a key fob tester sitting on their counter in which you can point your key fob at this sensor...

Q: What does the keyless entry keypad do?

While you have a mechanical key and a remote entry system for your car, you may also have a keyless entry keypad. This is another way of locking and unlocking the car, as well of doing several other things. Here’s...