The situation when Nissan Murano stops opening the back door, often causes panic among owners, especially if it happens in rainy weather or in the parking lot of a shopping center. The problem can be either trivial - the battery is dead - or require serious intervention in the electrical system or the locking mechanism. Electromechanical drive The trunk in crossovers of this brand is reliable, but over time it wears out or fails under the influence of moisture and dust.
Ignoring the first signs of a malfunction can lead to the door becoming completely jammed, and you will have to resort to drastic measures to gain access to the cabin or luggage compartment. Owners Nissan Murano of the second and third generations, it is worth knowing the basic diagnostic algorithms so as not to overpay for a simple tow truck or an urgent visit of a technician. Body control unit often records errors that can be read using diagnostic equipment, but many problems can also be solved mechanically.
The main reasons for failure of the trunk opening system
The first thing to check if the door fails is the battery charge level. System Smart Key and electric drives require stable voltage, and even a slight sag can block the operation of the mechanism. If the headlights are dim and the starter turns sluggishly when you turn the key, the problem is definitely in the power source.
The second most common culprit is failure of the electric drive (actuator) of the lock. Over time, the gears inside the mechanism wear out, or the motor winding burns out. Owners Nissan Murano Often they encounter that when the button is pressed, a click is heard, but the door remains closed. This is a classic sign that lock rod does not receive a command to unlock due to mechanical jamming or burnout of the motor.
The third reason lies in the malfunction of the control buttons. The button on the door itself or the remote control may fail due to oxidation of the contacts or damage to the wiring in the corrugation.
- 💡 Check the operation of the button on the door: sometimes it just gets stuck due to dirt.
- 🔋 Make sure the spare remote control is working properly.
- 🔌 Inspect the wiring harness connectors in the door hinge area.
Diagnostics of electrical wiring and connectors
One of the most insidious problems is a break in the wiring in the corrugated tube connecting the body and the trunk door. With constant opening and closing wiring harness frays and contact is lost. Visually this is not always noticeable, since the insulation may be intact, but the cores inside may be broken.
To check, you need to remove the door trim and test the lock control circuits with a multimeter. If there is no voltage at the connector when you press the button, then the problem is in the power circuit or in the switch itself. Warning lamp will help you quickly determine the presence of a signal on the control unit.
It is important to consider that moisture entering the connectors causes corrosion of the contacts, which leads to an increase in resistance and a voltage drop across electric drive.
- 🧼 Clean the connector contacts with a special spray for cleaning electrical equipment.
- 🔍 Inspect the corrugation for creases and insulation breaks.
- 🛡️ Apply dielectric grease to the connectors after cleaning.
Mechanical faults of the lock assembly
Sometimes the electrics work properly, but the lock mechanism physically cannot work. This occurs due to wear of plastic parts or foreign objects entering the lock body. Ice in winter can also cause blockages if moisture gets inside the mechanism and freezes.
In such cases, attempting to open the door by force may result in broken rods or handles. It is necessary to dismantle the casing and check the condition of the rods connecting the button and the lock. If the rod is disconnected or broken, the door will not open even when a signal is given to actuator.
⚠️ Attention: Do not try to open the door by force if you hear the sound of a running motor, but the mechanism does not work. This may result in the plastic clips breaking off or the glass being damaged.
Software crashes and need to reset
Modern cars such as Nissan Murano, are controlled by complex computer systems. Sometimes a software glitch occurs when the control unit body electronics “remembers” the error and blocks further attempts to open. In this case, rebooting the system helps.
To reset errors, you can disconnect the battery for a few minutes, which will reboot all units. However, this is a temporary measure. If the problem is systemic in nature, you will need to connect to a dealer scanner to flash or reset the lock adaptations.
Step-by-step instructions for self-repair
If you decide to do the repairs yourself, follow a clear algorithm of actions. Start by checking the simplest things: battery charging and button operation. If they are in good condition, proceed to dismantling the door trim.
☑️ Check before removing the trim
Removing the casing requires care, as the plastic clips break easily. After removing the casing you will have access to lock mechanism and wiring. Check whether the signal is received by the motor when the button is pressed.
If the signal arrives, but the motor does not turn, replace the actuator. If there is no signal, look for a break in the wiring.
- 🔧 Use a set of Torx keys to unscrew the door fasteners.
- 🔌 Disconnect the power supply before replacing the motor.
- 🔨 Carefully release the lock rods from the clamps.
- Dead battery
- The actuator is broken
- Wiring problem
- Electronics error
Specifics of replacing the actuator and lock
Replacement electric lock drive — the procedure is not the most complicated, but it requires care. A new actuator may require adjusting the position of the linkages in order for the mechanism to work correctly. Don't forget to check the condition of the rubber seals to ensure that moisture does not get into the new unit.
When purchasing a spare part, pay attention to the original part number. Analogues may have different torque characteristics or rod length, which will lead to rapid failure. Original castle Nissan guarantees compatibility and durability.
How long does it take to replace a lock?
On average, replacing an actuator takes from 40 minutes to 1.5 hours, depending on the experience of the technician and the car model. If a complete replacement of the lock assembly is required, the time may increase.
Breakdown prevention and maintenance
To avoid recurrence of the situation, regularly carry out preventive measures. Lubricate the lock mechanism with special silicone grease, especially before the start of the winter season. This will prevent moisture from freezing and moving parts from jamming.
Clean the rubber door seals from dirt and apply rubber conditioner to them. This will prolong their life and provide a seal, protecting the electrics inside the door from water ingress. Regular inspection wiring in the corrugation will allow you to identify the problem before it becomes critical.
Every winter, before severe frosts, treat the trunk lock with antifreeze liquid for locks to eliminate the risk of the mechanism freezing.
When to turn to professionals
If you do not have the skills to work with auto electricians or you do not have the necessary diagnostic equipment, it is better to entrust the repair to specialists. Incorrect connection may result in short circuit and failure fuse box or other electronic modules.
Service center specialists will be able to quickly read errors, determine the exact cause and replace the failed part. For Nissan Murano There are specialized services that know all the “sores” of this model and have original spare parts in stock.
⚠️ Warning: If the problem is with the body control module (BCM), tinkering with it yourself may result in a complete vehicle lockout, requiring complex and expensive programming.
Table of common faults and solutions
For clarity, here is a summary table of the most common problems with the rear door on Nissan Murano and ways to eliminate them.
| Problem | Probable Cause | Solution |
|---|---|---|
| The door does not open, silence | Dead battery | Charge the battery or light a cigarette |
| I hear a click, the door doesn't work | Lock actuator wear | Replacing the electric drive |
| The door button doesn't work | Oxidation of contacts | Cleaning or replacing the button |
| The door opens with a jerk | Wear of rods or mechanism | Adjusting or replacing rods |
| Error on the dashboard | Electronics failure | Read errors and reset |
Regular lubrication of the lock mechanism and checking the wiring in the corrugation can prevent 80% of problems with opening the rear door on Nissan Murano.
Final Recommendations
Problem opening the rear door Nissan Murano is not fatal and in most cases can be solved by replacing one of the nodes. The main thing is not to panic and conduct a competent diagnosis. Understanding the system allows you to save time and money on repairs.
Remember that prevention is always cheaper and easier than repair. Regular maintenance of mechanisms and timely replacement of worn parts will ensure reliable operation of the car for many years. If the problem persists after repair, there may be a hidden fault in the wiring or control unit, which requires a professional approach.
Always keep a mechanical key for the trunk lock in the glove compartment (if the design provides one) so that in an emergency you can open the door manually.
Frequently asked questions (FAQ)
Is it possible to open the rear door of a Nissan Murano from the inside if it is jammed?
Yes, in most cases you can open the door from the inside by removing the trim panel and disconnecting the lock rod. However, on some modifications, access to the mechanism from inside the cabin is limited.
How much does it cost to replace a lock actuator on a Nissan Murano?
The cost depends on the model (Z50 or Z51) and the type of spare part (original or analogue). On average, the price of a part ranges from 5,000 to 15,000 rubles, plus the work of a master.
Why does the door open but immediately close?
This may be caused by a faulty lock position sensor or a software glitch. The system considers that the door is not completely closed and tries to lock it again.
Is it possible to reset the error without a scanner?
Sometimes completely disconnecting the battery for 15-20 minutes helps. This resets the control units, but if the cause is physical, the error will return.
Does the weather affect the operation of the power trunk?
Yes, severe frosts can thicken the lubricant and freeze the mechanism, and rain can cause a short circuit in leaking connectors.