Situation when it stops working rear window washer by car Nissan Qashqai first generation (J10), is one of the most common complaints from owners. In the harsh Russian winter or during the spring thaw, the lack of clear visibility through the rear window turns driving into a real risk. The problem can be either a simple blockage or a serious breakdown of the electronics or mechanics of the system.
Many car owners immediately blame a burnt out washer pump, but this is not always the case. Often the reason lies in a break in the wiring in the corrugation of the trunk door or in mechanical damage to the trunk door itself. washer nozzles. In order not to change parts at random, it is necessary to carry out competent sequential diagnostics, which will save time and budget.
Main causes of rear wiper system failure
Rear window washer system Nissan Qashqai J10 is structurally different from the front unit, as it often combines fluid supply and operation janitor in one work cycle. When you turn the wiper lever to its extreme position, the pump is turned on, which supplies fluid through a special tube going into the trunk lid.
If you hear the characteristic sound of the motor running, but the fluid does not come out, the problem is almost certainly in the mechanical part. It could be nozzle clogged dirt or ice, or a frayed supply tube, which often breaks at the bend when opening the trunk.
If there is a complete absence of sound from the pump, the reason lies in the electrical circuit. This includes a malfunction of the electric pump motor, fuse blown or broken contacts in the wiring harness. Sometimes the culprit is the body control module (BCM), which stops sending the signal to turn on.
Checking the fluid line and injectors
The first diagnostic step is a visual inspection and checking the pressurized water supply. If the pump works, but there is no jet, you need to check the integrity of the tube going from the tank to the door. On Qashqai J10 this area is especially vulnerable due to constant bending.
Remove the plastic trim on the trunk lid to get to the tube passage. It often happens that the plastic of the tube becomes brittle from frost and cracks, or it simply becomes disconnected from the nozzle fitting. In this case, the liquid simply pours inside the casing and not onto the glass.
- 🔍 Inspect the nozzle for ice or dirt clogging - clean it with a thin needle.
- 💧 Check the tightness of the tube connections in the area of the trunk door hinge.
- 🛠️ If the tube bursts, replace it with a new one or use a flexible hose of a suitable diameter.
⚠️ Attention: Never try to “blow out” the nozzle with your mouth or a powerful compressor without dismantling, as you can push through the seal and flood the door electronics or trim with water.
- Yes, there is sound, but no water
- No, silence
- There is sound, but weak/husky
- Didn't check
Diagnostics of electrical parts and fuses
If, when you turn on the washer mode, you do not hear even a slight buzz from the pump, you need to check the electrical circuit. Start by checking the fuse responsible for washer pump. On Nissan Qashqai J10 This fuse is usually located in the block under the hood.
You will need the wiring diagram, which is located on the inside of the fuse box cover. Look for a fuse marked WASH or RR WASH. If it burns out, replace it with one of a similar amperage, but first make sure that there is no short circuit in the circuit.
In addition to the fuse, the pump relay itself often fails (if it is located separately) or the contacts in the pump connector oxidize. Contacts may oxidize due to moisture entering the engine compartment, especially in the area of the washer reservoir.
- 🔋 Check the fuse in the box under the hood (usually 10A or 15A).
- ⚡ Inspect the pump connection connector for oxidation or moisture.
- 🔧 Check for voltage at the pump contacts when turning on the lever.
☑️ Electrical diagnostics
Replacing the rear window washer pump
If the fuse is intact, there is voltage at the connector, and the pump does not work, it means that the electric motor itself has burned out. On Nissan Qashqai J10 The rear washer pump is often built into a common unit with the front washer pump or is a separate module located at the bottom of the reservoir.
To replace it, you need to drain the fluid from the tank, disconnect the hoses and electrical connector. Be careful: the plastic pump housing can be fragile, especially after winter. Carefully remove the old assembly and install the new one, after lubricating the rubber seals with silicone grease.
It is important to note that on some trim levels the rear washer pump has a separate inlet. If you replace only part of the pump and leave the old "body" part, leakage or loss of pressure may occur. It is better to change the entire assembly.
How to distinguish between front and rear washer pumps?
Most Qashqai J10 models use a two-section pump, where one impeller pumps water to the windshield and the second to the rear. If one sector burns out, the other may work fine, but electrically they are often powered through the same circuit or through different contacts within the same housing.
⚠️ Attention: When replacing the pump, be sure to check the condition of the supply hoses. An old, oak hose may burst when put on a new fitting, which will lead to repeated repairs.
Problems with wiring in the tailgate corrugation
The most insidious malfunction on Nissan Qashqai J10 is a broken wire in the rubber corrugation connecting the body and the trunk door. Due to the constant opening and closing of the cover, the wires inside the corrugations fray. In this case, the gap may be visually hidden under a layer of insulation.
To check this area, you need to remove the plastic trim on both sides of the trunk opening. You will see a wiring harness going into the corrugation. Carefully pull the wires out of the rubber and inspect them for breaks, especially at bends.
Most often, the power wires for the pump and the signal from the button on the wiper lever are frayed. If you find a break, the wires need to be stripped, twisted and well insulated, preferably using heat shrink tubing and soldering for reliability.
- 🔌 Remove the decorative trims from the trunk opening.
- 🧵 Inspect the wires in the corrugation for chafing and breaks.
- 🔨 Restore the integrity of the wiring and protect the insulation with heat shrink.
Before removing the corrugation, mark the position of the wires so as not to confuse them when reassembling, especially if you plan to shorten or extend them.
Fuse and Relay Code Table
To make troubleshooting easier, we have compiled a table of the main elements responsible for the operation of the washer system. Please note that the location may vary slightly depending on the year of manufacture and market (European or Asian version).
| Component | Location | Marking | Denomination | Function |
|---|---|---|---|---|
| Fuse | Block under the hood | F17 or F23 |
15A | Power supply for washer pumps |
| Fuse | Block in the cabin | F36 |
10A | Power supply to the wiper control unit |
| Relay | Block under the hood | R12 |
— | Rear window pump switching |
| Pump motor | In the washer reservoir | — | — | Liquid pumping |
Troubleshooting shift lever problems
Sometimes the problem lies not in the pump or wiring, but in the switch itself on the steering column. The microswitch inside the wiper handle wears out or oxidizes over time. If you don't hear the relay operating when you turn the lever back, this could be the cause.
To check, you need to use a multimeter in dial mode. Remove the plastic steering column cover and locate the connector that goes to the switch. Check whether the contacts close when turning the lever to the washer position.
If the multimeter shows an open circuit when the lever is activated, you will need to either clean the contacts inside the switch (which is difficult and not always effective) or replace the entire handle assembly. On Nissan Qashqai J10 is a fairly common problem after 5-7 years of use.
Often the problem lies not in the pump itself, but in a broken wire in the tailgate corrugation, since this unit is subjected to constant mechanical stress when the lid is opened.
FAQ: Frequently asked questions
Why does the pump work but no water flows to the rear window?
Most likely, the nozzle is clogged with ice or dirt, or the supply tube in the area of the door hinge has burst. Check the integrity of the hose under the trunk trim.
Where is the rear window washer fuse on a Qashqai J10?
The main fuse is located in a block under the hood, usually labeled WASH or RR WASH. The exact fuse number depends on the year of manufacture of the vehicle.
Is it possible to replace just the rear washer pump?
On most J10 models, the rear and front washer pump are a single unit. If one sector breaks down, it is often necessary to replace the entire pump unit, although there are separate repair kits.
What to do if water is pouring into the trunk?
This means the supply tube has become disconnected or burst. You need to remove the trunk lid trim, find the leak and restore the tightness of the connection or replace the hose.