Infiniti G35 Door Lock Actuator Guide (2003-2008): Symptoms and Replacement
If your G35's power locks are failing, you're not alone—here's what you need to know about replacing the actuator.
- Actuator failure is a very common issue on 2003-2008 G35s; you are not alone.
- Aftermarket replacements are a cost-effective and reliable alternative to expensive OEM parts.
- Replacement is a difficult DIY job that requires removing the door panel and often the window glass.
- Ensure you buy the correct part for your G35 (Coupe vs. Sedan) and the specific door (Left vs. Right).
Is Your G35 Door Lock Actuator Failing?
Door lock actuator failure is one of the most common problems for the 2003-2008 Infiniti G35. The original factory parts are known to wear out over time, causing the power locks to become weak or stop working entirely. This is not a safety recall item, so the cost of repair falls to the owner. Fortunately, quality aftermarket replacements are available that can solve the problem for good.
Common Failure Symptoms
When an actuator starts to fail, the signs are usually obvious. You may notice one or more of the following:
- No Response: The door lock doesn't move at all when using the key fob or interior lock switch.
- Weak or Slow Operation: You can hear the actuator trying to work, but it doesn't have enough power to fully lock or unlock the door. This may get worse in hot or cold weather.
- Intermittent Function: The lock works sometimes but not others.
- Stuck Door: In severe cases, the lock can fail in the locked position, making it very difficult to open the door from either the inside or outside.
Choosing the Right Aftermarket Actuator
Since the original OEM actuators have a high failure rate, choosing a new aftermarket part is a smart and cost-effective decision. Aftermarket actuators provide the same function, often at a fraction of the dealer price. Here’s a look at the available brand tiers:
- Standard Ignition: As a well-known brand, Standard Ignition (SMP) parts are engineered to meet or exceed original specifications. They are a trusted choice for reliability and are considered a higher-quality aftermarket option.
- Replacement: This brand offers a direct-fit part at a more budget-friendly price point. For a common failure item like this, a Replacement-brand actuator can be a practical way to restore function without overspending, especially on an older vehicle.
Check Your Fitment!
🎬 Watch this detailed disassembly guide for G35 coupe door components.The door lock actuators for the G35 Coupe and Sedan are different. Parts are also specific to the driver's side and passenger's side. Always confirm the part you are ordering matches your exact vehicle model (2-door or 4-door) and the specific door you are repairing.
Cost of Replacing a G35 Door Lock Actuator
Replacing a door lock actuator can be expensive at a dealership, largely due to the high cost of the OEM part and labor. By choosing an aftermarket part and performing the replacement yourself, you can save hundreds of dollars.
| Part/Service | Estimated Cost |
|---|---|
| New Aftermarket Actuator | $26 - $212 |
| New OEM Actuator | $450 - $600+ |
| Shop Labor | $122 - $180 |
| DIY Aftermarket Replacement | $26 - $212 (Parts Only) |
| Shop Replacement (OEM Part) | $572 - $780+ |
This is a Challenging DIY Job
Replacing the actuator is more involved than on many other cars. The process requires removing the entire interior door panel, disconnecting cables, and on many G35 models, removing the window glass and window regulator assembly to access the actuator. While it can be done at home with basic tools, it requires patience and mechanical confidence. Watch a few video guides for your specific model (coupe or sedan) before you begin.
🎬 See a step-by-step walkthrough for replacing the sedan actuator.Frequently Asked Questions
Can I just replace the small motor inside the actuator?
Some owners attempt to fix the actuator by replacing only the small internal electric motor. This is a very difficult and delicate process that requires soldering. 🎬 Watch how to replace just the internal motor for $15. A more reliable and common repair is to replace the entire actuator assembly.
Do I need to replace all the actuators at once?
No, you only need to replace the actuator that has failed. However, because this is such a common failure, if one has failed, the others may not be far behind. If you are comfortable with the replacement process, you might consider replacing them in pairs.
Will a new aftermarket actuator need to be programmed?
No. A direct-fit door lock actuator is a plug-and-play part. It does not require any special programming. However, some users have reported that certain aftermarket parts can interfere with the auto-window roll-down feature, though this is not a universal issue.
My door is stuck shut. How can I replace the actuator?
This is a worst-case scenario. It can be very difficult to remove the interior door panel with the door closed. Some owners have had success by simultaneously trying the manual lock and the power lock button to jiggle the mechanism free. If that fails, you may need to carefully pry the door panel off while it's shut, which risks damaging the panel.
Helpful Videos
Technical Specifications
OEM Part Numbers: 80500-AC800 80501-AC800 80552-AL510
This is a complete assembly that includes the latch and the electronic actuator motor. It is a direct-fit, plug-and-play replacement.
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.
- Infiniti G35: