Skip the auto shop - Our mechanics make house calls

Q: The remote or the inside unlock button will not lock or unlock doors

asked by on

The remote or the inside door lock buttons will not lock or unlock either of the 4 doors.At first it was only one of the back doors but now its all 4.You can see the buttons jump when you press remote.

My car has 14000 miles.
My car has an automatic transmission.

A: The door lock actuators that lock and unloc...

The door lock actuators that lock and unlock your doors can become weak and won't have quite enough power to fully move the lock mechanism inside your door. This can happen for a couple of reasons. The individual actuator is failing or all the actuators may not be getting enough power. This can be measured as voltage with a multimeter.

If all four doors failed at the same time, I would suspect you have a problem at the power source or the lock/unlock relay. This is where you will need a wiring diagram from a repair manual to help you locate the correct fuses, ground connections and relays. There are two possible systems available for your year, make, and model. There is a premium version and the base model.

The base model uses a separate relay for the the lock and unlock function and the premium version uses only one relay. I suspect you have the premium version as the one lock/unlock relay could certainly produce the symptoms you are experiencing. It makes the most sense based on the description of your issue.

If you have the base version, you will need to check the voltage at each actuator. Better yet, find a common point that feeds power to all of them and begin testing there. If it is a bad power connection, it will be at a point that all the actuators utilize. If you have 12+ volts at each actuator, I would next do a voltage drop at the ground connections. Again, look for a common ground connection for all the actuators.

If the doors failed one at a time and not all at once, lets say over a period of months, I might suspect all the actuators have failed. GM door lock actuators are common failure item. I would only suspect this is your case if they failed one at a time over a extended period of time. For help having this diagnosed, a qualified professional from YourMechanic can come to your car's location to inspect the lock problem.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: A/C only blows occasionally and only on high

Hi there. You have more than one problem with the A/C blower and blend door controls on the vehicle. The blower motor is bad and most likely burned out the blower resistor from drawing too many amps. Have the blower...

Q: Well the check engine light is blinking. A track light keeps coming on and there seems to be loss of power. Engine running rough.

Hello. If the check engine light is flashing then that typically means that there is a cylinder misfire. This can be caused by a bad spark plug, spark plug coil, or fuel injector. It can also be caused by something...

Q: Ran over truck tire debris and now something is leaking.

You may have damaged the windshield washer reservoir. You may want to contact your insurance company if the damage is more than deductible. Body damage is more expensive than most people think. Even the replacement shield underneath may be close...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...