2019-2022 Chevrolet Blazer Door Lock Actuator Replacement Guide
Here’s what to know when a door lock fails on your Chevrolet Blazer.
- Before replacing the part, check for water intrusion as noted in TSB #19-NA-243, which can cause identical symptoms.
- Failure typically affects only one door at a time; symptoms include unresponsiveness or grinding noises.
- An aftermarket part from a brand like Standard Ignition is a cost-effective alternative to OEM, but ensure an exact part number match.
- Replacement is possible for a DIYer but involves removing the entire interior door panel.
Is a Door Lock Failing on Your Blazer?
A bad door lock actuator is a common issue on many vehicles, and the 2019-2022 Chevrolet Blazer is no exception. Usually, the problem is limited to a single door. You might notice one door doesn't lock or unlock with the others. You may also hear a buzzing or grinding noise from inside the door when you press the lock button. In some cases, the lock might work on and off before it fails completely.
Important: Check for Water Leaks First
Before you buy a new actuator, check for water damage. General Motors issued Technical Service Bulletin (TSB) #19-NA-243 for the Chevrolet Blazer. This bulletin notes that power door locks can stop working due to water leaking past body plugs located where the door wiring passes into the vehicle's body. This water causes corrosion in the electrical connectors. Check the carpet near the front of the door for dampness, and inspect the wiring harness connector in the door jamb for any green or white corrosion before assuming the actuator itself has failed.
Symptoms of a Bad Door Lock Actuator
🎬 Watch: Common symptoms of a failing door lock actuator- One Door Won't Lock/Unlock: The most common symptom is when one door doesn't respond to the key fob or the interior lock switch, while the others work fine.
- Strange Noises: A buzzing, grinding, or clicking sound from inside the door when you try to lock or unlock it often means the actuator's internal gears are stripped or the motor is failing.
- Erratic Behavior: The lock may get stuck, or lock and unlock by itself.
- Door Ajar Warning: The actuator assembly often includes the sensor that tells the car if the door is closed. A faulty one can cause the "Door Ajar" light to stay on, which can also prevent the alarm from setting correctly.
Choosing the Right Aftermarket Part
When replacing a door lock actuator on your Blazer, you have two main choices: Original Equipment Manufacturer (OEM) from a GM dealer, or an aftermarket part from a brand like Standard Ignition.
- OEM: An OEM part is the exact same component your vehicle was built with. It guarantees a perfect fit and function, but it is usually the most expensive option.
- Aftermarket (Standard Ignition): Aftermarket brands like Standard Ignition produce new parts designed to be direct-fit replacements. They are a cost-effective alternative to OEM and are often built to meet or exceed original specifications. For a part like a door lock actuator, an aftermarket unit from a reputable brand offers good value. Ensure the part number is an exact match for your Blazer's specific door (e.g., front driver-side) and options (with or without keyless entry) to ensure proper electronic communication with your vehicle.
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket (Standard Ignition) | $130.39 |
| New OEM (GM Genuine) | $146 - $187 |
| Used OEM | $50 - $120 (Varies) |
| Shop Labor | $173 - $253 |
Pro Tip: Replacing the Actuator
Replacing the door lock actuator is a job an experienced DIYer can handle. It requires removing the interior door panel, 🎬 See how to remove the Blazer's front door panel carefully peeling back the weather barrier, and unbolting the actuator from inside the door. 🎬 Watch: Step-by-step guide to replacing the door lock actuator The job is considered to have intermediate difficulty and can take between 1.5 and 3 hours. If you are not comfortable with this, a professional mechanic can perform the replacement for you.
Frequently Asked Questions
If one actuator fails, should I replace all of them?
No, it's not necessary. Door lock actuators fail from individual wear and tear. You only need to replace the one that has failed. The other actuators may continue to work for years.
My door makes a buzzing noise but doesn't lock. Is the actuator bad?
Yes, most likely. A buzzing or grinding sound without the lock moving is a classic sign that the small plastic gears inside the actuator have broken and the motor is spinning freely. The entire actuator assembly will need to be replaced.
What is TSB #19-NA-243 and how do I check for it?
This is a service bulletin from GM that warns technicians that water leaks can cause door lock failures on the Blazer. You can check for this by pulling back the carpet near the bottom of the front door opening to feel for moisture. You can also have a technician inspect the main door wiring connectors for signs of corrosion, which is a tell-tale sign of this problem.
Are there any recalls for the door locks on the 2019-2022 Blazer?
There are no major recalls for the door lock actuators themselves. A minor recall was issued for a small number of Blazers for an improperly made door *striker* (the metal loop the latch grabs), but this is a separate part from the electronic actuator. You can always check for open recalls on your specific vehicle by entering your VIN on the NHTSA website.
Helpful Videos
Technical Specifications
OEM Part Numbers: 13533686 13528256 13546484 13597552 13533591 13546503
This part is commonly referred to as a Door Latch Assembly. It is an integrated unit containing the mechanical latch and the electronic actuator motor. Each door (Front Left, Front Right, Rear Left, Rear Right) uses a specific, unique part. Assemblies also differ for vehicles with and without passive keyless entry.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
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