ŠKODA Roomster trunk does not open: what to do and how to fix it

Owners ŠKODA Roomster They often encounter a problem when the trunk refuses to open - neither from the button on the key, nor from the inside handle, nor even after physical effort. The situation is especially unpleasant if important things or tools are stored in the trunk, and access to them is blocked. The reasons for such a malfunction can vary from a banal lock jamming to serious problems with electrical wiring or comfort control unit (BCM).

In this article, we will look at all possible scenarios - from simple mechanical problems to complex electronic failures typical of Roomster first and second generations. You will learn how to diagnose the problem yourself, what tools you will need for repairs, and when to call for service. We will pay special attention unique feature of the model: a combined trunk and rear door lock drive, which often fails due to corrosion at the cable attachment points.

1. Mechanical reasons: from jamming to cable breakage

Let's start with the most obvious and easily fixed problems. In 60% of cases the trunk Roomster does not open due to mechanical faults that do not require electrical intervention. Here are the three most common reasons:

• 🔧 Lock jammed due to dirt, ice or corrosion. This is especially true for vehicles operated in high humidity conditions or after pressure washing.
• 🧵 Broken or stretched cable lock drive. The cable wears out over time, especially if you often open the trunk with force.
• 🚪 Misalignment or deformation of the rear door after an accident or careless parking. Even a slight displacement of 2-3 mm can block the mechanism.

To check the mechanical part, try opening the trunk manually. To do this:

1. Remove the plastic trim inside the trunk (it is secured with clips).
2. Locate the emergency cable (usually red or orange) near the lock.
3. Pull the cable with a force of 10-15 N (about the same as when opening the hood on old cars).

If the trunk opens, the problem is definitely mechanical. If not, move on to checking the electrical system. Important: Do not apply excessive force to the cable so as not to break it completely.

2. Electrical faults: from fuse to BCM

If the mechanics are fine, but the trunk still does not respond to the key button or interior handle, the problem lies in the electrical part. B Roomster A chain is responsible for opening the trunk, including:

• ⚡ Fuse F37 (10A) in the fuse box under the steering wheel (responsible for the central locking and trunk).
• 🔌 Relay J359 (comfort relay), which controls the lock drive.
• 📶 Comfort Control Module (BCM), which processes signals from the button and key.
• 🔋 Trunk lock actuator, which physically opens/closes the mechanism.

For diagnostics you will need a multimeter. Start by checking the fuse F37:

1. Open the fuse box (located to the left of the steering wheel, under the cover).
2. Remove the fuse F37 and check its integrity visually or using a tester.
3. If the fuse is blown, replace it with a new one same rating (10A).

If the fuse is good, proceed to checking the voltage at the actuator. To do this:

1. Remove the trunk trim from the lock side.
2. Locate the actuator connector (usually white with 2-3 wires).
3. With the ignition on and the trunk release button pressed, measure the voltage between the connector contacts. Must be 12V.

No voltage indicates a problem with the wiring, relay J359 or BCM. If there is voltage, but the trunk does not open, the actuator is faulty (replacement is required).

Check fuse F37 (10A)|Measure the voltage at the actuator with the button pressed|Run the circuit from relay J359 to the actuator|Check the ground on the body next to the lock-->

3. Problems with the key and fob: why the button doesn’t work

Often owners Roomster They complain that the trunk does not open with the key fob, while the inside handle works. This may be due to:

• 🔑 Low battery in the key (even if the car opens, there may not be enough energy to open the trunk).
• 📡 Failure of the signal receiver in the rear of the car (the antenna is located under the trunk trim).
• 🔄 Synchronization failed between the key and the immobilizer (relevant after replacing the battery or prolonged inactivity).

The first thing to do is replace the battery in the key to a new one (type CR2032). If this doesn't help, try resynchronizing the key:

1. Get into the car and close all doors.
2. Insert the key into the ignition and turn it to position ON (do not start the engine).
3. Press and hold the trunk release button on the key for 5 seconds.
4. Turn off the ignition and remove the key. Repeat the procedure 2-3 times.

If synchronization does not help, the problem may be with the receiver antenna. To check it:

1. Remove the trunk trim on the right side (passenger side).
2. Find the black block with the antenna (usually located next to the light).
3. Check the integrity of wires and connectors. Often contacts oxidize due to moisture.

In rare cases it is required immobilizer flashing in the service. This is true if none of the keys open the trunk, but it is mechanically sound.

4. Corrosion and wear: weak points Roomster

ŠKODA Roomster, especially models before 2015, are known for the problem of corrosion in the trunk latch area. This is due to design features:

• 💧 Accumulation of water at the bottom of the rear door due to poor sealing of the seals.
• 🔗 Oxidation of cable and rods lock, which leads to jamming of the mechanism.
• 🔩 Corrosion of actuator mounts, which is why it stops working normally.

To prevent this problem, it is recommended:

1. Regularly (every 3 months) lubricate the lock mechanism silicone grease (for example, WD-40 Specialist Silicone).
2. Check the condition of the seals and replace them if necessary (the original number of the rear door seal is 6U6 837 015).
3. After washing, dry the trunk, especially in the lock area, with compressed air.

If corrosion has already damaged the mechanism, you will need:

1. Remove the trunk lock (socket wrenches 10 and 13 are needed).
2. Clean all metal parts from rust (use a rust converter, e.g. Hi-Gear HG5711).
3. Replace damaged rods or cable (original cable - 6U6 837 711).

In advanced cases, it may be necessary to replace the entire lock assembly (original number - 6U6 837 011 for models up to 2010, 5J6 837 011 for restyled versions).

How to temporarily open the trunk when the lock is jammed?

If the trunk does not open using any of the methods, you can try the following method (only for emergencies!):

1. Remove the rear trunk parcel shelf (it is secured with 4 plastic clips).

2. Find access to the inside of the rear door through the access hole (usually closed with a rubber plug).

3. Using a long screwdriver or wire, try to push the lock mechanism from the inside.

Attention: This method may damage the casing or mechanism, use it only if other methods have not worked!

5. Diagnostics using a diagnostic scanner

If the self-check does not produce results, the next step is to connect a diagnostic scanner (for example, VCDS (VAG-COM), OBDeleven or Carista). These devices allow:

• 🔍 Read errors in the comfort control unit (BCM).
• 📊 Check the condition of the trunk lock actuator.
• 🔄 Test relay operation J359.

Typical trunk related errors Roomster:

Error code	Description	Possible reason
B11EF	Malfunction of the trunk lock drive	Open circuit, actuator or BCM fault
B11F0	Short circuit in trunk actuator circuit	Damage to wiring or oxidation of contacts
U1113	No connection to the comfort unit	Problems with CAN bus or BCM
B11E9	Incorrect signal from the trunk release button	Malfunction of the button or wiring to it

For diagnostics using VCDS:

1. Connect the scanner to the diagnostic connector (located under the steering wheel, to the left of the pedals).
2. Select block 46 — Central Conv. (Central Comfort).
3. Go to section Measuring Blocks and select a group 009 to check the condition of the locks.
4. Press the trunk release button and watch the parameters change. If the values do not change, the problem is in the button or wiring.

If the scanner shows an error B11EF, but the actuator is working (checked with a multimeter), most likely it needs replacement comfort control unit (BCM). This is a serious malfunction, and without experience it is better to contact the service.

6. When to contact the service: complex cases

Some trunk problems Roomster cannot be eliminated on your own. Contact the service if:

• 🔧 The trunk lock is damaged as a result of an accident or vandalism (replacement with adjustment of door geometry is required).
• 🔌 Diagnostics showed a malfunction BCM or problems with the CAN bus.
• ⚡ After replacing the actuator or lock, the problem persisted (the control unit may be configured incorrectly).
• 📶 Re-flashing of the immobilizer or adaptation of new keys is required.

Service repair cost:

Type of work	Cost (RUB)	Lead Time
Trunk electrical diagnostics	1 500 — 2 500	30-60 minutes
Replacing the trunk lock actuator	3,000 – 5,000 (with spare parts)	1-2 hours
Replacing the trunk lock assembly	6,000 – 9,000 (with spare part)	2-3 hours
BCM repair/replacement	15 000 — 30 000	1 day

When choosing a service, give preference to specialized repair centers ŠKODA/VW, as they have access to original spare parts and diagnostic software. Be sure to check whether the work is guaranteed (minimum 6 months).

⚠️ Attention: If after a service repair the trunk stops opening again within a month, this may indicate poor quality work. Demand a re-diagnosis or a refund - according to the law “On the Protection of Consumer Rights” (Article 29), you have the right to have defects eliminated free of charge.

7. Prevention: how to avoid problems with the trunk

To the trunk Roomster served for a long time and without failures, follow these recommendations:

• 🧴 Mechanism lubrication: Apply once every six months silicone grease on the rods and the lock cable. Avoid graphite lubricants - they attract dirt.
• 🚿 Seal care: wash the rear door rubber seals with soapy water and treat glycerin for elasticity.
• 🔋 Electrical control: Check the fuse once a year F37 and clean the relay contacts J359 from oxidation.
• 🔑 Careful handling of the key: Do not drop the key fob or expose it to moisture. When replacing the battery, use only high-quality cells (Duracell, Energizer).

Also useful:

1. Avoid sudden slamming of the trunk - this reduces the life of the mechanism.
2. Do not overload the rear door (maximum load 50 kg).
3. When parking on slopes, leave the trunk slightly open to avoid deformation of the seals.

If you frequently transport large loads, consider installing additional trunk shock absorber (for example, Sachs 100 333). This will reduce the load on the lock mechanism and extend its service life.

❓ Why doesn't the Roomster trunk open from the button on the key, but does it open from the passenger compartment?

This is a typical key timing problem or a faulty receiver antenna. Start by replacing the battery in your key fob. If it doesn’t help, check the antenna in the rear of the car (located under the trunk trim on the right). Resynchronizing the key often helps: insert it into the ignition, turn it to the ON position, press the trunk button and hold for 5 seconds. Repeat 2-3 times.

❓ How to open the trunk if the emergency release cable is broken?

In this case, you will have to dismantle the trunk trim from the inside. Remove the rear shelf, then the plastic panel on the lock side. You will see the lock mechanism - try to open it manually by pressing the lever with a screwdriver or wire. If this does not help, you will need to remove the rear door (you need two people and 13mm wrenches to secure the hinges).

❓ Is it possible to drive if the trunk does not close completely?

Strongly not recommended. A trunk that is not tightly closed can open while driving, which can lead to an accident. In addition, dust, moisture and exhaust gases will penetrate into the cabin. If the lock does not secure the door, secure it temporarily with a belt or rope, but correct the problem as quickly as possible.

❓ How much does it cost to replace a Roomster trunk lock?

The cost depends on the year of manufacture and type of lock:

• Original lock for models up to 2010 (6U6 837 011) - about 4,000–6,000 rubles.
• Original lock for restyled versions (5J6 837 011) — 5,000–8,000 rub.
• Analogs (for example, Febi 23630) — 2,500–4,000 rub.

Replacement work will cost 1,500–3,000 rubles. depending on the service.

❓ Why does the trunk open by itself after replacing the actuator?

This indicates incorrect adaptation of the new actuator. In the comfort control unit (BCM) you need to reset the settings of the old drive. This requires a diagnostic scanner (eg VCDS). The procedure takes 5-10 minutes and includes:

1. Connecting the scanner to the car.
2. Block selection 46 — Central Conv.
3. Running a procedure Adaptation for the channel Trunk Lock Actuator.

Without adaptation, the actuator may operate randomly or not respond to commands.