How many volts should a blower motor receive?

Typically it’s done by measuring the voltage at the blower motor connector when it’s turned on. If there is a voltage at the motor (at least 4-6 Volt at low speed and 12 Volt at high speed), but the motor doesn’t run, the motor is bad or jammed.

How do you check the voltage on a blower motor?

Keeping the black lead on a good ground, usually a bolt on the engine block, and the blower switch turned on, use the red lead to probe the plug that usually attaches to the blower motor. The meter should read between 9 and 11 volts or the test light will light up.

How do I test my blower motor resistor?

Blower Motor Resistor Testing Place one lead of the Ohmmeter on terminal 1 of the resistor. Place the other lead on terminal 2 and check against specifications. If this circuit is open, showing infinity on the Ohmmeter, the blower resistor must be replaced.

How many wires does the blower motor resistor use?

The blower motor resistor’s harness connector has 4 wires coming out of it. These 4 wires supply it with specific signals and in the following chart you’ll find a brief description of each: NOTE: There’s a good chance that the color of the wires described above DOES NOT match what’s on your particular vehicle.

How can I tell if my blower motor has a problem?

Press and hold the OFF button and within 10 seconds press and release the Window Defogger button five times. The system enters the self-diagnostic mode and at the end of it, if there is a problem, the fault code will be displayed on the display.

What does speed m2 mean on a blower fan?

NOTE: Speed M2 is the blower speed right below HI. Let’s take a look at what your test results mean: CASE 1: One or more of the terminals DID NOT have 12 Volts when the blower fan speed knob was turned.

How is the speed of the blower motor controlled?

The electronic module that controls the speed of the blower motor is called a blower motor control module. In some cars, the blower motor has only 4 or 5 fixed speeds. In this case, the speed of the blower motor is controlled by a blower motor resistor.