Dimensions do not work on Nissan Sunny: 7 reasons and how to fix the problem

You turned on the side lights on your Nissan Sunnybut they don't light up? The problem can lie either in a banal blown fuse or in serious electrical wiring faults. In this article, we will analyze all possible causes - from simple to complex - and provide step-by-step instructions for diagnosis and repair.

Feature Sunny (especially models B13/B14/B15) is that the size circuit is connected to the fuse box under the hood and the interior relay. Often the problem is solved by replacing fuse No. 17 (10A) or cleaning relay contacts K-9. But if the problem is not with them, you will have to check the lamps, ground and wiring.

Important: before starting diagnostics, make sure that the battery is charged (voltage is not lower than 12.4V), and the terminals are not oxidized. Otherwise, you may waste time searching for a non-existent problem.

1. Checking fuses and relays

The first thing to do is inspect the fuse box. B Nissan Sunny responsible for dimensions:

• 🔥 Fuse No. 17 (10A) — in the cabin unit (next to the steering wheel, under the cover).
• ⚡ Relay K-9 — in the engine compartment (black, next to the battery).
• 🔌 Fuse No. 31 (15A) - in some modifications (for example, Sunny FB15 since 2004).

How to check:

1. Remove the fuse box cover (snap the latches or unscrew the screws).
2. Remove fuse No. 17 with tweezers and inspect the filament. If it burns out, replace it with a new one (only of the same value!).
3. If the fuse is intact, but the dimensions do not work, check the relay K-9. To do this, swap it with a similar one (for example, with a fan relay). If the dimensions work, the relay is faulty.

If the fuses and relays are good, but the problem remains, proceed to the next step.

2. Diagnostics of lamps and sockets

A common cause of non-working dimensions is burnt out lamps or oxidized contacts in the sockets. B Nissan Sunny side lights are combined with low beam in one bulb (lamp H4 or H7, depending on the year).

How to check:

• 💡 Unscrew the lamp from the headlight (after disconnecting the negative terminal of the battery!).
• 🔍 Inspect the filament of the dimensions (it is thinner than the low beam). If it burns out, replace the lamp.
• 🔌 Check the cartridge for oxidation or burnt contacts. Clean them with sandpaper or WD-40.

If the lamps and sockets are in order, but the lights do not light up, the problem may be in ground or wiring.

3. Check ground and wiring

Poor ground or damaged wiring is one of the most insidious faults. B Sunny mass of dimensions attached to the body under the battery (black wire with ring terminal).

How to diagnose:

1. Unscrew the negative terminal of the battery.
2. Find the mass point (usually bolted to the spar or wing with a 10mm bolt).
3. Clean the contact area from rust and oxides, tighten the bolt.
4. Check the wire with a multimeter: there should be resistance between ground and body 0 ohm.

If the ground is OK, inspect the wiring:

• 🔍 Check the wires from the fuse box to the headlights for breaks or melts.
• 🛠️ Pay special attention to the places where the wiring passes through rubber seals (often chafed).

How to check wiring without a multimeter?

You can use a test lamp (12V) or temporarily connect the wire directly from the battery to the headlight. If the lights light up, there is a problem with the wiring.

4. Light switch malfunctions

If the fuses, lamps and wiring are in order, but the dimensions do not work, the culprit may be light switch (steering column or on the panel). B Sunny This is a typical problem, especially after 100,000 km.

Signs of malfunction:

• 🔄 Dimensions only work in one switch position.
• 💥 When turned on, you hear clicks or a burning smell.
• 🔦 Other light modes (for example, low beam) do not work.

How to check:

1. Remove the plastic steering column trim (unscrew 2-3 screws).
2. Disconnect the switch connector and check the contacts for oxidation.
3. Ring the contacts in the "dimensions" position with a tester - there should be resistance 0 ohm.

If the switch is faulty, it will have to be replaced (part number for Sunny B14: 25520-4M000).

5. Problems with the light control module (BCM)

In modern Nissan Sunny (For example, FB15 2006-2012) is responsible for the dimensions body control module (BCM). If all previous checks have failed, this may be the problem.

Symptoms of a faulty BCM:

• 🚨 Dimensions do not work, but fuses and relays are working.
• 🔄 Other light functions (for example, turn signals) also fail.
• 💻 Errors appear on the dashboard (for example, B2555 — faulty circuit of dimensions).

How to diagnose:

1. Connect a diagnostic scanner (for example, Launch CReader) and check for errors in the BCM.
2. If there are errors in the size chain, reset them and check if they appear again.
3. If the BCM is faulty, it will have to be reflashed or replaced (expensive, but there is no other way).

6. Oxidation of contacts in connectors

Another common problem is oxidation of contacts in wiring harness connectors. B Sunny especially vulnerable:

• 🔌 Connector E18 (under the hood, next to the fuse box).
• 🔌 Connector C101 (behind the instrument panel, responsible for communication with the BCM).
• 🔌 Connectors on the headlights themselves (often oxidize due to moisture).

How to clear contacts:

1. Disconnect the connector and inspect the contacts for green deposits (oxidation).
2. Clean the contacts with alcohol or a special liquid (for example, Kontakt 60).
3. Apply a thin layer Litol-24 or dielectric grease to protect against moisture.

Attention! If after cleaning the contacts the dimensions work, but after a while the problem returns, look for the cause of moisture (for example, a cracked headlight seal).

7. Table of faults and solutions

Symptom	Probable Cause	Solution
The lights don't light up, but the low beam works	The filament in the lamp has burnt out	Replace lamp H4/H7
Dimensions and cigarette lighter do not work	Fuse No. 17 (10A) has blown	Replace the fuse, check the circuit for short circuit
Dimensions only work in one switch position	The steering column switch is faulty	Replace the switch (part no. 25520-4M000)
Dimensions flash or dimly lit	Poor ground or oxidized contacts	Clean the ground under the battery, check the connectors
Dimensions and turn signals do not work	Faulty BCM or relay K-9	Diagnostics with a scanner, replacement of relay/unit

Frequently asked questions (FAQ)

Is it possible to drive without lights if they don’t light up?

No! According to traffic rules (clause 19.5), in the dark or in conditions of insufficient visibility necessarily Side lights must be turned on. Failure to do so may result in a fine. 500 rubles (Article 12.5 of the Administrative Code).

Why do the lights not light up, but the brake lights work?

This is normal - the brake lights and parking lights are connected to different circuits. If the feet work, but the dimensions do not, look for the problem in fuse No. 17, relay K-9 or light switch.

Which fuse is responsible for the dimensions on the Sunny B14?

B Nissan Sunny B14 (1995-2000) responsible for dimensions fuse No. 17 (10A) in the salon block. Also check the relay K-9 in the engine compartment (next to the battery).

Can the dimensions not work due to the alarm?

Yes, if the alarm is connected to the parking lights circuit (for example, for the flashing light function). Check the alarm unit and its relay - sometimes they block the operation of the standard light.

How much does it cost to repair dimensions in the service?

The cost depends on the reason:

• Replacing the lamp: 200-500 rub.
• Replacing the fuse/relay: 100-300 rub.
• Wiring repair: 1,500-3,000 rub.
• Replacing the light switch: 2,000-4,000 rub.
• BCM diagnostics: 1,000-2,500 rub.

If after all checks the dimensions on your Nissan Sunny If it still doesn't work, contact an auto electrician. The problem may be an unobvious wiring break or a faulty control unit. Don’t delay repairs: driving without clearance is not only subject to fines, but also dangerous!