Reverse sensor <em>Nissan Almera G15</em>: diagnostics, repair and replacement

Nissan Almera G15 is a popular sedan, but even it has electrical problems over time. One of the most common problems is failure reverse sensor, which is responsible for turning on the lights and camera (if installed). If, when switching to reverse gear, the lamps do not light up or are constantly on, this is where the problem lies.

In this article, we will look at how to independently diagnose a malfunction, select an original or analog part, and replace it without contacting service. We will look at typical symptoms, connection diagrams and nuances that will help save time and money.

Symptoms of a faulty reverse sensor

The main symptom is the lack of reaction of the reversing lights when the gear is engaged. But there are other signs that are often ignored:

• 🔴 Reversing lights don't light up or they shine dimly (possible circuit breakage or contact oxidation).
• 🟡Lamps are on constantly, even in neutral gear (contacts sticking inside the sensor).
• 🔊 Extraneous sounds when switching to reverse gear (clicks, grinding sounds - may indicate mechanical damage).
• 📱 Lights up on the dashboard Check Engine (rare, but possible with a short circuit).

If the problem is accompanied Check Engine, first check for errors with a scanner (for example, P0705 — sensor circuit malfunction). B Almera G15 The reverse sensor is located on the gearbox, and its diagnosis does not require special equipment.

⚠️ Attention: If the reverse lights do not work, but the sensor is OK, check the fuse F30 (10A) in the mounting block. Its failure is the second most common cause of failure.

Where is the reverse sensor located on Nissan Almera G15?

The sensor is installed on gearbox (both manual and automatic). Exact location:

• 🔧 On Manual transmission — in the upper part of the gearbox housing, closer to the passenger compartment. Access is possible from the battery side.
• 🔄 On Automatic transmission — on the side of the box, next to the selector. Can be covered with a protective cover.

To get to the sensor you will need:

1. Remove the negative terminal from the battery.
2. Disconnect the power connector from the sensor (latch or clamp).
3. Unscrew the sensor with a key 22 mm (on some models - 24 mm).

On Almera G15 from 2013 to 2018, the reverse sensor has a catalog number 39210-4M000 (original) or 39210-4M005 (analog). Check the version by VIN code, as restyled models may have other parts.

How to check the reverse sensor with a multimeter?

Diagnostics takes 10–15 minutes. You will need:

• 🔧 Multimeter (in dialing or resistance measurement mode).
• 🔌 Two wires with “crocodiles” for easy connection.
• 🔦 Flashlight (gearbox lighting).

Check procedure:

1. Remove the sensor from the box (as described above).
2. Connect the multimeter probes to the sensor contacts.
3. Insert a screwdriver into the groove of the sensor and imitate pressing (as when engaging reverse gear).
4. If the sensor is working properly, the multimeter should show 0 ohm (short circuit) pressed and ∞ (open circuit) when released.

Remove the terminal from the battery|Disconnect the sensor connector|Unscrew the sensor with a 22 mm wrench|Ring the contacts with a multimeter|Check the integrity of the wiring-->

If the sensor does not ring or shows constant resistance, it must be replaced. Also inspect the connector for oxidation or broken wires.

⚠️ Attention: On Almera G15 with Automatic transmission The reverse sensor can be combined with selector position sensor. In this case, replacement requires care so as not to disrupt the box settings.

Selection of original sensor and analogues

Original sensor from Nissan costs from 1,200 to 1,800 rubles, but there are high-quality analogues that are cheaper. Comparison of options:

Manufacturer	Article	Price (RUB)	Features
Nissan (original)	39210-4M000	1 500–1 800	12 month warranty, precise fit
Valeo	403212	800–1 100	Good quality, suitable for manual and automatic transmissions
Febi	22410	600–900	Budget option, possible problems with tightness
Sasic	2101008	500–700	Low price, but the resource is less than the original

When choosing an analogue, pay attention to:

• 🔍 Housing material - must be metal (plastic cracks quickly).
• 🔌 Connector type - on Almera G15 A 2-pin connector is used.
• 🛡️ Tightness — the sensor must have a rubber sealing ring.

Step-by-step instructions for replacing the sensor

Replacement takes 20–30 minutes. You will need:

• 🔧 Key on 22 mm (or 24 mm for some versions).
• 🔌 Screwdriver with a flat blade (for removing the connector lock).
• 🧴 WD-40 (if the sensor is stuck).
• 🔋 New sensor and o-ring (if included).

Sequence of actions:

1. Disable negative terminal battery
2. Locate the sensor on the transmission and clean it of any dirt.
3. Disconnect the connector by pressing the latch (do not pull the wires!).
4. Spray the threads with WD-40 and wait 5 minutes if the sensor does not come out.
5. Carefully unscrew the sensor with a wrench. Be careful: there is a spring and a ball in the hole in the box - don't lose them!
6. Install new sensor with O-ring and tighten firmly 25–30 Nm.
7. Connect the connector and check the operation of the reversing lights.

What should I do if the sensor does not work after replacement?

If the lights do not light up, check:

1. **Fuse F30 (10A)** - could burn out due to a short circuit.

2. **Wiring integrity** from the sensor to the fuse box (often frays near the box).

3. **Correct installation** - the sensor must be screwed in all the way, otherwise the contacts will not close.

4. **Condition of the contacts in the connector** - oxidation or corrosion may interfere with the signal.

After replacement, check the tightness: if oil is oozing from under the sensor, it needs to be tightened or the seal replaced.

Common replacement mistakes and how to avoid them

Even experienced car owners make mistakes that lead to repeated breakdowns. Common problems:

• 🔧 Dragging the sensor - may damage the threads in the box. Maximum effort - 30 Nm.
• 🔌 Ignoring oxidized contacts — even a new sensor will not work if the connector is dirty.
• 🛢️ Ball or spring loss — without them the sensor does not work. If they fall out, you will have to disassemble the box.
• 🔋 Poor polarity - on some analogues the contacts may be mixed up.

⚠️ Attention: If after replacing the sensor with Automatic transmission There are jerks or delays when shifting gears, reset the gearbox adaptation. To do this, disconnect the battery for 10 minutes or use a diagnostic scanner (for example, Launch X431).

Cost of service replacement vs self-repair

Prices for replacing a reverse sensor in services vary:

Service type	Cost (RUB)	Opening hours
Official dealer Nissan	2 500–3 500	1–1.5 hours
Independent service	1 200–2 000	30–40 minutes
Self-replacement	0 (part cost only)	20–30 minutes

The savings when doing your own repairs are obvious, but keep in mind:

• ⚠️ Without experience, there is a risk of damaging the threads in the box.
• ⚠️ On Automatic transmission You may need to reset the adaptation, which is difficult to do without a scanner.
• ⚠️ The warranty on the part is valid only when installed in the service (if you buy from an official dealer).

If you are not confident in your abilities, it is better to entrust the work to professionals - especially on cars with CVT or robotic gearbox.

FAQ: Frequently asked questions about the reverse sensor Nissan Almera G15

Is it possible to drive without a working reverse sensor?

Technically yes, but it's not safe. Reversing lights warn other drivers about your maneuver, and their absence can lead to an accident. In addition, on Almera G15 with a rear view camera without a signal from the sensor, the screen will not turn on.

Why do the lights stay on constantly after replacing the sensor?

This indicates:

1. Incorrect installation (the sensor is not screwed in completely or is skewed).
2. Short circuit in the wiring (check the circuit from the sensor to the fuse box).
3. Defective new sensor (return under warranty).

Disconnect the sensor connector - if the lights go out, the problem is there. If they continue to burn, look for a short circuit.

Which reverse sensor is suitable for Almera G15 with a variator?

On model with CVT sensor is installed 39210-4M005 (different from mechanics). Please check by VIN code, as restyled versions (after 2016) may have different part numbers.

Can the reverse sensor be repaired?

In most cases, no. The sensor is a sealed switch, and its disassembly results in loss of sealing. The exception is cleaning the contacts if the problem is oxidation.

Where can I buy an original sensor cheaper?

Optimal options:

• Exist.ru — often there are discounts up to 20%.
• AutoDoc — original spare parts with a guarantee.
• Groups in Telegram for the sale of used spare parts for Nissan (price from 500 rub.).

Avoid shopping on Avito or Yule Without checking the seller, there is a high risk of running into a fake.