Many sedan owners Nissan Almera new generation (G15) are faced with the problem of failure of the electrical mechanisms for raising the rear windows. This is a common fault that turns a comfortable car into an uncomfortable one, especially in rainy or hot weather. Often the problem lies not in complex electronics, but in simple wear of the electric motor brushes or a broken cable inside the mechanism.
If you notice that the glass does not rise or falls with a characteristic grinding noise, you must immediately carry out diagnostics. Ignoring the symptoms can lead to complete breakdown of the window regulator or, even worse, to the windshield getting stuck in the down position when it rains. In this article we will analyze all possible causes, diagnostic methods and describe in detail the process of replacing units.
Reasons for failure of electric windows on Almera G15
The main reason for failure of the rear mechanisms on Nissan Almera is the low quality of the components used. The manufacturing plant often installs motors with an insufficient safety margin, which leads to rapid wear of the graphite brushes inside the electric motor commutator. Over time, the brushes wear down to such an extent that contact with the commutator is lost and the motor stops rotating.
The second most common cause is a broken drive cable. The cables are stretched under significant force, and when moisture or dust gets into the guides, they begin to rust and fray. At the moment of peak load, for example, when the seal freezes, the cable simply breaks and the mechanism slide stops moving.
Sometimes the problem lies in the electrical circuit. Switches Door cards may oxidize or lose contact due to frequent pressing. Also, do not rule out a break in the wires in the corrugation between the door and the body. Moisture entering the corrugation causes corrosion of the contacts, which leads to a complete lack of power to the motor.
- 🛠️ Wear of electric motor brushes due to long service life.
- 🔌 Oxidation of contacts in detachable connections or broken wiring.
- ⚙️ Destruction of plastic gears in the gearbox of the mechanism.
- ❄️ Freezing of glass in the seal and overload of the motor.
⚠️ Attention: If you hear the hum of the motor, but the glass does not move, do not try to lift it by force through the button. This will lead to breakage of the gear teeth of the gearbox and increased repair costs.
DIY fault diagnosis
Before disassembling the door, it is necessary to determine exactly what is broken. Start by checking switches. If the front rear window control buttons do not respond, try using the button located directly on the rear door. If the window moves from the rear button, then the problem is in the button on the driver's door or in the wiring.
For deeper diagnostics, you will need to remove the door card. This is a simple procedure, but requires care so as not to break the plastic clips. Unscrew all visible screws, pry the card with a flat-head screwdriver and carefully unclip the latches. After removing the trim, you will see the window lift mechanism and its electrical connectors.
Check for voltage at the motor connector using a multimeter. Turn on the ignition and press the lift button. If there is voltage, but the motor does not work, the problem is in the electric motor itself. If there is no voltage, look for an open circuit or a malfunction in the door control unit. Relay on this model it is often integrated into the switch block, so replacing it requires replacing the entire assembly.
- Doesn't rise at all
- Rises with jerks
- A hum is heard, the glass does not move
- The glass is warping
Selection of spare parts: original or analogue?
Spare parts market for Nissan Almera The G15 offers a lot of options. The original window lift mechanism is quite expensive, but guarantees compatibility and durability. However, many owners choose high-quality analogues from trusted brands, such as Mapco or Starline, which offer an acceptable price-quality ratio.
When purchasing, it is important to pay attention to the packaging. Some manufacturers only sell motor, while others offer a complete mechanism. Replacing only the motor is possible, but it requires certain skills and time to disassemble the gearbox. If the mechanism is already old, it is better to replace it entirely to avoid repeated repairs in six months.
Below is a table with estimated prices and characteristics of popular options for spare parts for the rear door:
| Part type | Brand | Approximate price (RUB) | Service life |
|---|---|---|---|
| Original | Nissan | 12 000 - 15 000 | 7-10 years |
| Analogue (medium) | Starline | 4 500 - 6 000 | 3-5 years |
| Analogue (premium) | Mapco | 7 000 - 9 000 | 5-7 years |
| Motor only | Different | 2 500 - 4 000 | 3-4 years |
⚠️ Attention: Avoid buying cheap Chinese analogues without labeling. Their motors often have low torque and burn out after a few cycles, especially if the door seal is old and creates high resistance.
Step-by-step instructions for replacing the mechanism
The process of replacing the rear window regulator with Nissan Almera The G15 requires patience and a basic set of tools. You will need Phillips and flat head screwdrivers, a 10 mm socket wrench, and a plastic spatula to remove the door trim. Work in a clean area to prevent small parts from getting lost.
The first step is to remove the door card. Remove the door handle trim and unscrew the screws underneath it. Then remove the screws in the armrest and speaker area. Carefully disconnect the backlight connectors and power window buttons. Remove the card by unclipping the latches around the perimeter and set it aside.
Next you need to dismantle the glass. Unscrew the bolts securing the window regulator to the door. Lower the glass as far as possible (if the mechanism is still working) or lift it manually, securing it with tape to the top edge of the door so that it does not fall inside. Unscrew the bolts securing the glass to the mechanism slider.
☑️ Preparation for replacing the mechanism
Remove all bolts securing the mechanism to the metal door. Remove the old assembly through the access hole in the door. Install the new mechanism, observing the bolt tightening order. Screw the glass onto the new slide, making sure it is level and not askew.
- 🔧 Use a torque wrench to tighten the mechanism mounting bolts.
- 🛡️ Check the integrity of the waterproofing film before assembling the door.
- 🔋 Disconnect the negative terminal of the battery before starting electrical work.
- 🧤 Wear gloves to avoid cutting yourself on the sharp edges of the metal inside the door.
Before finally screwing the mechanism, check the movement of the glass manually. It should move smoothly, without jamming or extraneous sounds.
⚠️ Attention: Do not overtighten the bolts securing the glass to the slide. The plastic bushings may burst and the glass will fall off again during the first use.
Setting up and checking operation after installation
After installing a new mechanism, it is necessary to carry out an initialization procedure. By car Nissan It is often necessary to reset the "high" and "low" point settings. Turn on the ignition and press the window up button for 5-10 seconds after the window is fully up. Then lower the window and hold the down button for another 5-10 seconds.
Check the function automatic lift (if it was included in the package). Press the button briefly and release - the glass should rise all the way on its own. If this does not happen, the learning procedure was carried out incorrectly or the obstacle sensor was triggered due to misalignment.
Reassemble the door card in reverse order. Make sure all clips are in place and no extra screws have been left inside the door. Test the operation of the window regulator several times in full cycle mode. Check to see if the glass is touching the door seal or frame.
What to do if the glass is warped?
If after replacement the mechanism works, but the glass warps, check the guides. Perhaps one of them was bent during dismantling. Also check the tightness of the seal around the perimeter of the door.
Correct initialization of the power window is a key step, without which the automatic lift will not work, and the anti-pinch function may work falsely.
Prevention and care of mechanisms
To keep the rear windows on Nissan Almera G15 served longer, it is necessary to carry out regular preventative maintenance. Once every six months, clean the glass seals from dust and dirt using special silicone sprays. This will reduce the friction of glass on rubber and reduce the load on the electric motor.
Monitor the condition of the waterproofing film inside the door. If it comes off or breaks, moisture gets inside, which causes corrosion of contacts and mechanisms. Restore the seal using butyl tape or a quality sealant. Also periodically check the door card clip latches to avoid losing them.
Be especially careful during winter. Before using the window regulator, make sure that the glass has come away from the seal. If it is frozen, first warm up the interior or gently heat the seal with a hairdryer. Do not try to lift the frozen glass with a button - this is guaranteed to burn out the motor or break the cable.
- ❄️ Check the condition of the seals before the start of the winter season.
- 🧴 Use silicone grease for glass guides once every 6 months.
- 🔍 Inspect the wiring in the door corrugation for chafing.
- 🚫 Do not use window lifts if the glass is frozen to the frame.
⚠️ Attention: Silicone grease should not come into contact with the rubber seals on the outside of the door, as this can cause them to swell and become deformed. Apply lubricant only to the guides inside the door.
Frequently asked questions and answers (FAQ)
Why does the rear window on the Nissan Almera G15 not go up, but a hum is heard?
This is a sign that the motor is working, but the mechanism cannot move the glass. Most often this means a broken cable inside the mechanism or the teeth of a plastic gear in the gearbox. The mechanism assembly needs to be replaced.
Is it possible to replace only the window lift motor and not the entire mechanism?
Theoretically, yes, if you know how to disassemble the gearbox and find a suitable motor. However, in practice, it is easier and more reliable to replace the entire mechanism assembly, since the old cables and guides are already worn out and may fail soon after repair.
How to reset the window regulator after replacement?
Turn on the ignition. Raise the glass with the button and hold it pressed for another 5-10 seconds after it is fully raised. Then lower the window and hold the down button for 5-10 seconds. After this, the auto-lift function should work.
How much does it cost to repair a rear window regulator?
The cost of service work usually ranges from 2000 to 3500 rubles per door. This price includes card removal, mechanism replacement, setup and assembly. If the wiring needs to be re-soldered or a switch replaced, the price may be higher.
Why does the rear window anti-pinch system activate?
A common cause is a seal that is too tight or dirty, which creates high resistance. The reason may also be that the glass is skewed or the guides are too tight. Cleaning and lubricating the seals often solves the problem.