Trunk lock Nissan Cefiro A32: device, repair and replacement with your own hands

Nissan Cefiro A32 (1994–2003) is a legendary business-class sedan, but even its mechanisms wear out over time. One of the common problems of owners is trunk lock malfunction. Either the lid does not open with the key, then it gets stuck in the half-open state, or the electric drive refuses to work. In this article we will analyze all typical trunk lock failures, methods for diagnosing and repairing them, and also give step-by-step instructions for replacing the mechanism with your own hands.

Feature Cefiro A32 — combined trunk opening system: mechanical (with a key) and electric (with a button or key fob). This complicates diagnostics, but allows you to more accurately determine the cause of the malfunction. We collected data from owner forums, service manuals and the experience of technicians to provide up-to-date information on trunk locks for all modifications of the A32 (including the 1998 restyling).

Trunk lock device Nissan Cefiro A32: diagram and principle of operation

Trunk lock Cefiro A32 consists of several key elements:

• 🔧 Mechanical part - lock cylinder, latch, rods and springs. Responsible for opening with a key.
• ⚡ Electric drive — an actuator (motor), which is activated when you press a button in the cabin or on the key fob.
• 🔌 Microswitch — cover position sensor (sends a signal to the control unit).
• 📶 Wiring and connectors — connect the actuator to the comfort block (BCM).

On models before restyling (1994–1997), a lock with plastic rods, which often broke down. After 1998, the manufacturer replaced them with metal, but the problem with wear of the cylinder and oxidation of the contacts remained. The electric drive is the same on all versions - Mitsuba M3552-05600 (or analogues Denso 89955-4M000).

Trunk lock connection diagram

Electrical circuit of the trunk lock Cefiro A32 includes:

1. Food +12V from the fuse #10 (10A) in the block under the hood.
2. Control signal from the comfort unit (BCM) by yellow-black wire.
3. Weight (GND) to the body through black wire.
4. Signal from the microswitch (closes when the lid is closed) by green-white wire.

When a button in the cabin is closed or a signal is sent from the key fob BCM sends an impulse to the actuator, which pulls the rod and opens the latch.

If the lock stops working, first check:

⚠️ Attention: On Cefiro A32 with the system Nissan Keyless Entry (keyless entry) if the key fob battery is low, the electric trunk drive may not operate, even if the mechanical opening with the key works.

Typical trunk lock malfunctions: symptoms and causes

According to the experience of owners and craftsmen, 80% of problems are with the trunk lock Cefiro A32 come down to five main problems:

Symptom	Probable Cause	Remedy
The lid cannot be opened with either a key or a button.	The latch mechanism is jammed or the rod is broken	Disassemble the lock, lubricate or replace the rods
The electric drive does not work, but it opens with the key	The actuator is faulty, the wiring is broken or the contacts are oxidized	Ring the chain, replace the actuator or clean the contacts
The lid opens but does not stay closed	Worn or broken latch, weakened springs	Replacing the latch or spring mechanism
There is a clicking sound when opening, but the lid does not lift.	The plastic link from the actuator to the latch broke	Replacing the rod (with a metal one for reliability)
The lock works every now and then, sometimes it jams	Contamination or corrosion of the cylinder, wear of the cams	Cleaning and lubricating the cylinder or replacing the lock assembly

The most common problem is broken plastic rods. On forums, owners often complain that after 10–15 years of operation, rods crumble into dust. The solution is to replace it with metal analogues (for example, from Nissan Maxima A32, they are interchangeable).

Another “weak” element - microswitch. If it malfunctions, the control unit (BCM) “does not see” that the lid is closed and can block opening. Checked with a multimeter: when the lid is closed, the contacts should close (resistance 0 ohm).

Diagnosis of the trunk lock: step-by-step instructions

Before disassembling the lock, check primary diagnosisto narrow down possible problems:

Try opening the trunk with the key (if it doesn’t work, there’s a mechanical problem)

Press the opening button in the passenger compartment (no response - check the electric drive)

Listen to the sounds when you press the button (there is a click, but the lid does not open - the rod is broken)

Check the fuse #10 (10A) in the block under the hood

Inspect the actuator connector for oxidation (disconnect and clean contacts)

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If the electric drive does not work:

1. Remove the trunk trim from the lock side (unscrew the 4 pistons and 2 screws).
2. Find the actuator connector (white, 2-pin) and disconnect it.
3. Connect the actuator directly to +12V (for example, from a battery). If the motor does not work, it is faulty.
4. Ring the wires from the connector to the comfort unit (BCM) to the cliff.

To check the mechanical part:

• 🔑 Remove the plastic trim from the inside of the trunk lid (held on by 3 clips).
• 🔧 Unscrew the two bolts securing the lock (10 mm).
• 👀 Inspect the rods and latch for cracks or wear.

⚠️ Attention: On Cefiro A32 with the system Nissan Anti-Theft System (NATS) When replacing the trunk lock, the keys may need to be retrained. If after repair the alarm goes off falsely, contact an auto electrician to reset the errors. BCM.

Trunk lock repair Nissan Cefiro A32 with your own hands

If diagnostics reveal a problem in the mechanical part, you can do without completely replacing the lock. Let's consider two cases:

1. Replacing broken rods

Plastic rods break due to the natural aging of plastic. To replace:

1. Remove the lock (as described above).
2. Disconnect the broken rod from the latch and actuator.
3. Install a new rod (we recommend a metal one from Maxima A32, art. 73201-4M000).
4. Adjust the spring tension so that the cover fits securely.

2. Cleaning and lubricating the lock cylinder

If the key is difficult to turn or jams:

• 🔧 Remove the cylinder from the lock (unscrew the locking screw from the inside).
• 🧴Rinse it WD-40 or kerosene to remove dirt.
• 🛠️ Lubricate with graphite grease or lithium grease in aerosol (don't use oil - it collects dust!).
• 🔑 Check the operation of the key - it should turn smoothly, without jamming.

If the cylinder is worn out (the key turns but does not open the lock), it will have to be replaced. Suitable analogues:

• 🔑 Original: 73101-4M000 (for models 1994–1997) or 73101-4M100 (1998–2003).
• 🔑 Analogue: Locksmith LK-NIS005 (universal for Nissan 90s).

3. Replacement of the electric drive (actuator)

If the motor does not work when connected directly to 12V:

1. Disconnect the actuator connector.
2. Unscrew the two mounting bolts (10 mm).
3. Remove the old actuator and install a new one (original - 28520-4M000, analogue - Denso 89955-4M000).
4. Connect the connector and check operation.

Replacing the trunk lock Nissan Cefiro A32 assembled

If repair is not practical (for example, the latch or lock body is broken), a complete replacement will be required. To do this:

Phillips screwdriver (for trim pistons)

Head on 10 mm (for lock bolts)

Flathead screwdriver (for removing clips)

WD-40 (for thread processing)

New lock assembly (see article below)

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Step by step instructions:

1. Open the trunk (if possible) or remove the interior trim to gain access to the lock bolts.
2. Disconnect the actuator connector and rod from the latch.
3. Unscrew the two bolts securing the lock to the trunk lid.
4. Remove the old lock and install the new one in reverse order.
5. Adjust the position of the latch so that the lid closes effortlessly.

Articles of assembled locks:

Years of manufacture	Original article	Analogues	Note
1994–1997	73200-4M000	Febi 35306, Meyle 31-16 000 0016	With plastic rods
1998–2003	73200-4M100	Denso 89950-4M000, Mitsuba M3550-05600	With metal rods

After replacing the lock, you may need to adjusting the latch position. If the trunk lid does not close tightly or does not lock, loosen the lock bolts and adjust its position.

⚠️ Attention: On Cefiro A32 with the system Nissan Intelligent Key (keyless entry) after replacing the trunk lock, it may be necessary to reprogram the keys at the service center. Otherwise, the alarm will sound when the trunk is opened.

Prevention of trunk lock malfunctions

To extend the life of your trunk lock, follow these simple guidelines:

• 🧴 Lubricate the larva 2 times a year (spring and autumn) with graphite or silicone grease.
• 🚿 Wash your trunk carefully — avoid direct contact of water with the lock (especially in winter).
• 🔌 Check your contacts actuator once a year - clean from oxidation and apply contact lubricant (For example, CRC 2-26).
• 🔑 Don't use force when opening - if the key does not turn, do not try to “break” the lock.

Pay special attention winter operation:

• ❄️ Treat the larva before frost lock defroster (For example, Liqui Moly Turschloss-Entfroster).
• 🚗 If the lock is frozen, do not pour hot water - use alcohol-containing liquid or hairdryer.

Owners on forums Cefiro A32 recommended once every 5 years preventively replace plastic rods with metal ones, even if they haven't broken yet. This will save you from sudden breakdowns on the road.

Cost of repairs and spare parts in 2026

Prices for spare parts and labor depend on the region and type of service. Average prices for Russia:

Part/Work	Price (original), ₽	Price (analog), ₽	Cost of work, ₽
Castle cylinder	2 500–3 800	800–1 500	500–1 000
Actuator (electric drive)	4 200–5 500	1 800–2 500	800–1 500
Lock assembly	6 000–9 000	3 000–4 500	1 500–2 500
Rod (metal)	—	300–600	200–500
Electric drive diagnostics	—	—	1 000–1 800

Do-it-yourself repairs will be cheaper, but require time and tools. For example, replacing rods and lubricating the cylinder with your own hands will pull on 500–1 000 ₽ (taking into account the purchase of lubricant and rods), whereas in the service center they will charge for the same work 2 000–3 500 ₽.

When purchasing spare parts, pay attention to:

• 📌 Year of manufacture car (before/after restyling in 1998).
• 📌 Body type (sedan A32 or station wagon A32W — they have different locks!).
• 📌 Availability of NATS system (if there is an immobilizer, the lock must be compatible).

FAQ: Frequently asked questions about the trunk lock Nissan Cefiro A32

Is it possible to open the trunk if the lock is broken and the electric drive does not work?

Yes, there are several ways:

1. Through the interior: remove the back seat and get to the trunk from the inside (on a sedan you will need to bend the trim).
2. Through the spare tire: if you have Cefiro with a hatch to access the spare tire, you can try to reach the lock rod.
3. Emergency cable: on some modifications there is an emergency release cable under the rear bumper (you need to pry off a plastic plug).

If all else fails, call a repairman or a tow truck to avoid damaging the cover.

Why do you hear a click when you press the button, but the trunk does not open?

This is a typical sign traction failure between the actuator and the latch. The actuator operates (you hear a click), but the rod does not transmit force to the mechanism. The solution is to replace the rod (preferably with a metal one).

What lubricant is best to use on the lock cylinder?

Suitable for larvae:

• 🧴 Graphite grease (For example, Liqui Moly Graphit-Spray) is the best option for long-term protection.
• 🧴 Silicone grease (For example, WD-40 Specialist Silicone) - does not attract dust.
• 🚫 Do not use oils (eg Litol or Solid oil) - they thicken in the cold and collect dirt.

Apply a thin layer of lubricant to avoid clogging the mechanism.

Where is the trunk lock fuse located?

Trunk electric fuse - #10 (10A) in the main fuse box under the hood (next to the battery). Also check the relay #5 (lock control). There is a diagram with symbols on the block cover.

Can I install a lock from another Nissan model?

Yes, but with reservations:

• 🔑 Locks from Nissan Maxima A32 (1994–2000) are completely interchangeable.
• 🔑 From Nissan Laurel C34 The cylinder and actuator are suitable, but the lock body is different.
• ❌ From Nissan Teana J31/J32 or Cefiro A33 The locks don't fit - the design is different.

Check the article numbers before purchasing!