How to diagnose a BMW 540 blower motor problem?

One of the first steps in diagnosing a blower motor problem is to verify the fuse is good. On our 1997 BMW 540 fuse # 28 (green arrow) is the power supply for the blower motor. You should unplug the fuse and see if it is blown.

Where are the fuses located on a BMW 5 Series?

Here you will find fuse box diagrams of BMW 5-Series 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 (520i, 520d, 523i, 525i, 525d, 528i, 530i, 530d, 535i, 535d, 540i, 545i, 550i), get information about the location of the fuse panels inside the car, and learn about the assignment of each fuse (fuse layout) and relay.

What is the green wire on the BMW E39 blower?

The green wire, blue tracer (red arrow) is the relay control (pin # 86) from the IHKA control unit. This wire should have voltage on it when the ignition key is on and the IHKA control unit is also on to activate the relay.

What should I do if I Blew My Fuse on my BMW?

Never attempt to repair a blown fuse, and do not replace a defective fuse with a substitute of another color or amperage rating, as this could lead to a circuit overload, ultimately resulting in a fire in the vehicle. Turn the two snap fasteners outwards. Fold the cover forwards or remove it.

When to replace AC blower motor in BMW 330i?

If your Heater, AC Blower Motor behind your dash has become noisy, squealing or whistling, it’s time to replace it. Dust will affect the bearing surfaces and eventually your blower motor will make strange noises. This video shows you a step by step removal and replacement of the blower motor in a 2004 BMW 330i Sedan.

Is there a problem with my BMW 330i heater?

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What is the ground for a BMW blower?

The brown wire, black tracer (purple arrow) is the ground for the relay. If the relay is not working you can jump this wire to ground and see if it starts to work. If it starts working then you have a bad ground or this wire is broken somewhere.

Where is the Green Arrow fuse on a BMW 540?

On our 1997 BMW 540 fuse # 28 (green arrow) is the power supply for the blower motor. You should unplug the fuse and see if it is blown. You are going to need to look at a wiring diagram for your specific car to make sure you are checking the right fuse. Notice this one has been replaced before as it does not match the other fuses.

What is in the fuse box on a BMW 5 Series?

Secondary air injection (AIR)pump, intake manifold air control solenoid, injectors (except 520i (22 6S1)/525i/530i),engine control module (ECM), evaporative emission (EVAP) canister purge valve, camshaft position (CMP) actuator 1 &2, idle speed control (ISC) actuator

Where does the voltage go in a blower motor?

The red wire, blue tracer (yellow arrow) is the voltage supply into the relay (pin # 30 on the relay) from fuse # 28 mentioned earlier. Make sure you have battery voltage with the key on. You can use the voltage on this wire to jump voltage to pin #87 to bypass the relay also and see if the blower motor works.

Where is the blower motor on a Honda Accord?

Blower motor underneath the dashboard behind the glove compartment; motor speed modulated using the blower final stage. Front and rear air outlets; nearly a dozen electric stepper motors attached to vent flaps control the flow of fresh or recirculated cold and warm air to windshield, face-level vents, foot wells and rear compartment.

Why is my heater not working in my BMW?

Aside from mechanical failure, the heating problems in your car may also be caused by a malfunction in the electronics of IHKA. A dedicated BMW scan tool can read fault codes off the HVAC system. But I’ll show you some simple tests of the system that you can do using a DVOM.

How does a BMW 5 series heater work?

Front and rear air outlets; nearly a dozen electric stepper motors attached to vent flaps control the flow of fresh or recirculated cold and warm air to windshield, face-level vents, foot wells and rear compartment. Engine cooling fan; IHKA microprocessor and engine control module (ECM) determine operation and speed of cooling fan.

What is brown wire on BMW E60 heater valve?

Working at the heater control valve, squeeze both release tabs and pull the connector straight off to remove it. On my vehicle the brown wire (yellow arrow) is a constant ground and the tan / orange and tan / brown wires (green arrows) are the battery volt controls from the HVAC control head.

What does the blower motor resistor do in a BMW?

What does the blower motor resistor do? The blower motor resistor in your BMW is part of the HVAC system, or the heating and air conditioning system. The system requires a motor, called the blower motor, which powers the fan utilized to propel air from your cabin vents.

Why is my HVAC fan not working in my BMW?

HVAC fan doesn’t work at all. In BMW cars, the blower motor resistor often overheats due to incorrect current measurements implemented during the design and engineering of the vehicles. This can cause the HVAC fan to not work at all due to motor failure, and it is unable to blow any air out of the vents.

What are common reasons MY BMW 528i has heater problems?

What are common reasons my BMW 528i has heater problems? While there are a variety of reasons your BMW 528i heater is not working, the most common 3 are a broken heater blower motor, a problem with the thermostat, or a failed heater blower motor resistor. See what others are asking about their BMW 528i.

When to know if your BMW blower motor resistor is failing?

It’s important to be able to notice slight changes in your BMW’s performance so that you can address such issues before the colder or warmer months of the year come up, leaving you without a working HVAC system. These are the most common problems and symptoms associated with blower motor resistor problems:

What does the blower motor do in a BMW?

The blower motor resistor in your BMW is part of the HVAC system, or the heating and air conditioning system. The system requires a motor, called the blower motor, which powers the fan utilized to propel air from your cabin vents.

Are there any recalls on the BMW 528i?

After more than four decades out on the road, 5 Series drivers are sure to find quirks and bugs that need to be fixed. Based on what we’ve seen come into our shop the most common BMW 528i repairs in Austin are: In the 528i’s long run there have only been 11 recalls that owners need to watch out for.

Where is the fan blower on a BMW?

It did make a noise far worse than that in the winter and then once it was warmer outside it went away and hasn’t come back yet. Either way it’s easy to replace the blower motor or clear the leaves out, it on the passenger side under the fuse box near the windshield.

Why does MY BMW fan make a loud noise when I turn it off?

Click to expand… your blower motor is likely going bad. If the noise stops when you turn the fan off, then it’s 99% chance something is wrong with blower motor or the wiring harness that connects it.