Climate control system on a crossover Nissan Murano - This is a complex unit that depends on the health of the electrical circuit. When the compressor stops turning on and the interior does not cool, the first victim is often air conditioner fuse. This is not just a piece of metal in a plastic case, but a critical element of protection that prevents the wiring from catching fire if there is a short circuit in the magnetic clutch or radiator fans.
Many owners Z51 and Z52 they try to solve the problem by simply yanking a relay or pressing buttons on a panel, but without understanding the electrical circuit this rarely works. Electrical fault may be hidden not only in a burnt-out fuse-link, but also in oxidation of contacts, wear of wiring, or simple mechanical damage. In this article we will look at where exactly the required block is located, how to diagnose it correctly and what to do if the new fuse burns out immediately after installation.
Location of the fuse box on Nissan Murano
To begin replacement or inspection, it is necessary to accurately determine the location of the fuse block. On crossovers Nissan Murano there are two of them: one is located in the engine compartment (IPDM E/R), the second is in the passenger compartment on the driverβs side. Air conditioner Usually protected by a fuse in the engine compartment, as it draws significant current from the main battery and generator.
Open the hood of the car and look for a black plastic box labeled IPDM E/R. It is located on the left side of the engine compartment (if viewed in the direction of travel), closer to the mudguard. The block cover has a schematic representation of the arrangement of elements on the inside. Study carefully electrical diagramto find the right element, since it is very easy to confuse them, especially in low light conditions.
There is also a unit inside the cabin, but it is primarily responsible for electronic control units, power windows and the audio system. For the climate system, the cabin can only be fan relay or the climate control unit control fuse, but the main compressor current goes through the engine compartment. If you're not sure where exactly to look, it's best to start by checking under the hood, since that's where the power part of the circuit is located.
Diagnosis and signs of a blown fuse
How do you understand that the problem is in the fuse and not in the compressor itself or the pressure sensors? The most obvious sign is the complete lack of response from the system when the button is turned on. A/C. You hear the relay click, but the compressor does not start, and there is no characteristic change in the sound of the engine running under load. However, if the fuse is blown, the relay may not even click.
Sometimes the problem manifests itself indirectly. For example, a radiator fan may run at maximum speed constantly or, conversely, not turn on at all. This is due to the fact that in the circuit Nissan Murano Fan and compressor control circuits are often combined. Visual inspection The transparent body of the element allows you to see the torn metal jumper inside, but this is not always visible to the naked eye.
For accurate diagnosis you need a multimeter. Switch the device to the continuity mode (diode or sound wave icon) and touch the metal legs of the fuse with the probes. If the beep is not heard and the indicator is not lit, the circuit is broken. Voltage check is also important: you need to make sure that power comes to the input of the fuse, and there is no power at the output if the element is working.
β οΈ Attention: Never replace a fuse with a higher rated fuse (for example, use 30A instead of 20A). This will cause the wiring to overheat and may cause a fire in the engine compartment. Nissan Murano at the first short flash in the circuit.
- π Visually inspect the integrity of the metal jumper inside the case.
- π Check the presence of voltage on the input and output legs with a multimeter.
- π§ Make sure there is no oxidation on the fuse socket contacts.
- No cold air at all
- The fan is noisy, the compressor does not turn on
- The climate works intermittently
- The system shows an error on the display
Algorithm for safe fuse replacement
The replacement process is simple, but requires strict adherence to safety precautions. Before starting work, be sure to turn off negative terminal battery This will eliminate the risk of a short circuit when removing the element, especially if you accidentally touch the car body or another live wire with metal tweezers.
Use special tweezers, which are usually located right in or next to the block cover. Capture air conditioner fuse behind the plastic case and carefully, vertically upward, pull it out. Do not use excessive force to avoid breaking the socket retainers or damaging adjacent components. If the fuse is tight, rock it slightly from side to side.
Install a new element of the same rating as the burnt one. The color of the new fuse body should match the old one, indicating the same amperage. Lock securely it in the socket so that vibrations on the road do not lead to loss of contact. After this, return the battery terminal to its place and check the operation of the system.
βοΈ Preparing to replace the fuse
β οΈ Attention: If, after replacing the fuse and turning on the ignition, the new element burns out instantly, this means there is short circuit in the chain. It is strictly prohibited to continue operating the vehicle in this mode, as this is a direct path to a wiring fire.
- β‘ Disconnect the battery before any electrical manipulations.
- π Use only an original or high-quality analog fuse.
- π© Check the reliability of fixing the new element in the socket.
Causes of repeated burnout and troubleshooting
If you replace a fuse and a few minutes later it blows again, the problem is not with the element itself. Most likely there is in the circuit short circuit or current leakage. In the air conditioning system Nissan Murano this is often due to an insulation breakdown on the compressor electromagnetic clutch wire or a malfunction of the compressor itself, which is mechanically jammed.
Another reason could be a faulty compressor start relay. The relay contacts may weld or short out, supplying a constant current that exceeds the fuse's capabilities. Also worth checking radiator fans, since their circuits often intersect with the air conditioner circuit in the IPDM block. A short to ground in the fan motor will cause the fuse to immediately blow when the system is turned on.
To troubleshoot, it is necessary to sequentially disconnect consumers. Disconnect the connector from the compressor magnetic clutch and try to turn on the system. If the fuse does not blow, the problem is in the compressor itself or the clutch. If it burns out, look for a short in the wiring between the fuse box and the compressor. Wiring continuity A resistance multimeter will help you find the location of the insulation breakdown.