Why the trunk won't open on a Nissan Micra: a complete troubleshooting guide

According to statistics from service centers, the most common culprits are:

• 🔋 Low battery (especially in winter) - blocks the operation of the electric drive.
• 🔌 Bad fuse F37 (10A) in the cabin unit - is responsible for the trunk lock circuit.
• 🔑 Microswitch failure in the lock cylinder - does not record the opening command.
• ⚡ Oxidation of contacts in the drive or button connector - interrupts the signal.
• 🔧 Worn mechanical opening cable — breaks or jumps off the fastenings.
• 🚗 Deformation of the trunk lid after an accident - interferes with the operation of the lock.

If the trunk Can't open in any way (using a button, a key, from inside), most likely the problem is mechanics — the lock or cable is jammed. If responds to the button, but does not open (clicks are heard), it's my fault electrician - drive, fuse or wiring.

2. Diagnostics: how to determine the cause of the breakdown

Before disassembling the trunk, perform simple diagnostics. It will take 10–15 minutes and will help narrow down the range of possible faults.

Step 1: Check the battery and fuses

If the trunk does not respond to the button neither from the key nor from the passenger compartment, start with:

1. Measure the voltage on the battery - it should be 12.4–12.7 V (with a lower value the electronics may not work).
2. Check the fuse F37 (10A) in the fuse box under the steering wheel. On Nissan Micra K13/K14 he is responsible for the trunk lock chain.
   Where is the fuse box located?

   On Micra K13/K14 The fuse box is located to the left of the steering wheel, under a plastic cover. To remove it, pull the tab at the bottom.

3. If the fuse is blown, replace it with a new one same denomination (no more than 10A!).

Step 2. Test the button and electric drive

If the battery and fuses are OK, check:

• 🔊 Are clicks heard? when you press a button? If yes, the problem is mechanical (cable, lock). If not, in the electrics (drive, wiring).
• 🔌 Does the button work in the cabin?? If not, check its contacts with a multimeter (should be 12 V when pressed).
• 🔧 Is there access to the drive? through the trunk lining? Sometimes it can be "nudged" manually.

If after diagnosis the cause remains unclear, proceed to the next section - there we will sort it out step by step instructions for each type of failure.

3. How to open the trunk of a Nissan Micra manually (emergency access)

If the trunk is locked and you urgently need to get there (for example, to get a battery or documents), use emergency opening. The method depends on the model Micra:

For Nissan Micra K13 (2010-2017)

This model has hidden cable loop under the rear bumper:

1. Remove the plastic plug under the bumper (driver or passenger side).
2. Find red loop or a cable - pull it down (to yourself).
3. If the cable breaks, try to get to the lock through hole for flashlight (taking it off).

For Nissan Micra K14 (2017–2023)

Here the emergency cable is hidden under the trunk trim:

1. Bend back the trim in the area of the trunk hinge (a flathead screwdriver is required).
2. Find orange lever - pull it left.
3. If the lever does not move, the lock is jammed and will require disassembly.

Attention! If the trunk opens in an emergency, do not close it back until you eliminate the cause of the breakdown. Otherwise, you risk having access blocked again.

4. Electrical fault repair

If the problem is electrical (no clicks when pressing the button, the drive does not work), follow the algorithm:

1. Replacing fuse F37

A blown fuse is the most common cause. On Nissan Micra it is located in the block under the steering wheel (see diagram below).

If after replacement the fuse burns out again, look for short circuit in the wiring (usually in the trunk area or under the seat).

2. Checking and replacing the lock drive

The electric drive (actuator) wears out or oxidizes over time. To check it:

1. Remove the trunk trim (unscrew the 4 plastic clips).
2. Find the drive - it is attached to the lock with two bolts.
3. Disconnect the connector and check the voltage with a multimeter (should be 12 V when pressing the button).
4. If there is voltage, but the drive does not work, replace it (part number for Micra K13: 28550-JM00A).

3. Repair of buttons in the cabin

Trunk release button on Nissan Micra often sticks or oxidizes. To fix it:

• Remove the plastic cover near the gearshift lever (it is held on by latches).
• Disconnect the button connector and check the contacts for oxidation.
• If the button is faulty, replace it (part number: 25560-JM00A).

5. Elimination of mechanical breakdowns

If the trunk does not open manually (key or emergency cable), the problem is mechanical. Let's look at the most common cases.

1. Replacing the mechanical opening cable

The cable stretches or breaks over time. Signs of damage:

• The key turns, but the trunk does not open.
• The cable sags or dangles when tensioned.

To replace it:

1. Remove the trunk trim and find the cable (runs from the lock to the hinge).
2. Disconnect it from the lock and lever, then install a new one (part number: 73501-JM00A).
3. Adjust the tension - the cable should not sag.

2. Repair or replacement of the trunk lock

If the castle jammed or it does not secure the cover, disassembly will be required. Most often they break:

• 🔐 Castle cylinder - wears out or freezes in winter.
• 🔗 Return spring - it bursts and the lock does not return to its original position.
• 🛠️ Microswitch — does not transmit a signal to open.

To replace the lock:

1. Remove the trim and disconnect the cable/electric drive.
2. Unscrew the 3 bolts securing the lock (you will need a head on 10 mm).
3. Install a new lock (part number for Micra K13: 72101-JM00A).

3. Adjusting the trunk lid

If the trunk doesn't close all the way or difficult to open, the problem may be loops or stops. Make adjustments:

1. Loosen the hinge bolts (you will need a wrench) 12 mm).
2. Adjust the position of the cover so that it fits snugly against the seal.
3. Check shock absorbers - if they are weak, the trunk may “sag” and cling to the lock.

6. Prevention: how to avoid trunk damage

To the trunk Nissan Micra served for a long time, follow simple rules:

• 🔧 Lubricate the lock silicone grease once every 6 months (especially before winter).
• 🚿 Avoid exposure to water into the mechanism - dry the seals after washing.
• 🔋 Keep an eye on your battery — a discharged battery can block the electric drive.
• 🔑 Don't pull the key with force - this deforms the lock cylinder.
• 🛠️ Check the cable for wear during each maintenance.

Attention! If the trunk started open every other time or delayed, do not delay diagnosis. In 90% of cases, timely lubrication or replacement of the cable prevents serious damage.

7. Frequently asked questions (FAQ)