What should I do if my ECM blower motor does not run?
If the motor runs the problem is in the low voltage thermostat wire. If the motor does not run, remove the 16 pin plug from the IFC board. Locate pins 12 and 15. Connect 24 volts from R to pin 12 and pin 15. Connect pins 1 and 3 to the common side of the 24 volt transformer (fig. 4). The motor should run. ECM Blower Motor Quick Test
What are the symptoms of a failed blower motor resistor?
Blower motor resistor problems. Problems with a blower motor resistor are common in many cars. The most common symptom of a failed blower motor resistor is when the heater fan only runs at high speed and doesn’t work at low speeds.
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.
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.
When does a blower motor need to be replaced?
CASE 2: The blower motor DID NOT run when you applied battery power and Ground with the jumper wires. This test result tells you that the blower motor is bad and needs to be replaced.
Blower motor resistor problems. Problems with a blower motor resistor are common in many cars. The most common symptom of a failed blower motor resistor is when the heater fan only runs at high speed and doesn’t work at low speeds.
What’s the best way to test a blower motor?
The way we’re going to test the blower motor is by manually applying battery power and Ground with jumper wires or a power probe. NOTE: If you use a jumper wire, make your own fused jumper wire to apply battery power to the blower motor (as a safety precaution against shorting the jumper wire to ground).