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Blower motor ground problem

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Really?

Add an external ground to the motor housing.

Posted on Nov 11, 2014

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Heater blower motor quit...need to find ground for resistor


I suggest you find your fuse/ relay center check fuses and try new relay, I think the relay is 75% at fault most of the time.
Blazerk from Altima forum suggest
Back probe the blower motor Blue/Yellow circuit and tap it to ground, if that doesn't make the blower operate, the blower motor/power transistor assembly is bad. When the blower motor does operate while grounding that circuit, the climate control panel may be faulty, repeat the test from the connector at the control panel to verify the wiring is not damaged. Also, When verifying voltage, Use the power and ground wires to the blower motor. Other grounds may give you faulty readings.
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2000 2003 Nissan Maxima Blower Motor Amplifier Resistor Replacement...

found this helpful answer from nissan mechanic on JustAnswer com

Jan 28, 2016 | Cars & Trucks

1 Answer

1993 Ford Escort Blower Motor & AC Switch


I'm going to start from the beginning.
The blower motor gets power from the high blower relay and it is grounded thru the fan switch and the resistor. So you should have power on the pink white blower wire coming from the high relay to the blower motor. The orange black wire from the motor is ground going to the resistor and fan switch. The blue wires on the control panel are for the ac compressor.
The high blower relay gets power from fuse number 5 in the box. The blower motor is grounded thru the resistor and then thru the fan switch.
Photo courtesy of AutoZone.com
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Jun 10, 2013 | 1993 Ford Explorer Limited

1 Answer

The heater fan just stopped...


Check fuse #14(10amp) located in fuse box under driver steering wheel behind the lower dash cover.
Check fuse#12(40amp) located in fuse box under hood.
Replace fuse(s) if any are blow.

If fuse are good.Check blower and transisto next.
Do steps 1-3 with turn key on
1. Unplug connector and check for 12v at the blue/white wire at the blower motor(2-NAT)
-if there's no voltage you might have a bad relay or open in the wire
-if there's about 12v, go to step 2
2.Plug connector for blower motor and unplug connector for blower transistor(4-NAT). Take a jumper wire and jump the blue/black wire to body ground.
-if blower does not run, replace blower motor
-if blower motor runs, go to step 3
3.check the black wire at(4-NAT) for good ground.
-if you have good ground, then replace blower motor transistor.
good luck

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Jan 18, 2011 | 2004 Honda Element

1 Answer

New Blower Motor, Resistor, Relay, Switch, all is new. Still nothing works. Any advice would be greatly appreciated. Please Help me out. HINK1974


There are two fuses a 40 amp in the power distribution center and a 10 amp in the fuse block. Are they good?

This is a ground side controlled system meaning the switch provides ground instead of power. With everthing plugged in there should be power on all the wires coming out of the blower motor resistor ( brown w/ tan, Light Blue, Light green w/ black, and tan wires). If you ground any of those wires the blower motor should run. If it does check the dark green wire at the HVAC control head. Backprobe that wire with it plugged in if there is power than either the control head is bad ( the mode switch has the final say in the path to ground for the blower motor. When the mode switch is in the off position the blower will not work. When it is in any other position (vent/floor/defrost) it allows the path to ground for the blower motor to be complete.

The last thing to check is to make sure the black wire coming out of the control head has a good ground. That is the final path to ground for the blower motor.

Jan 10, 2011 | 1999 Jeep Wrangler

1 Answer

2005 kia spectra blower dont come on for the heater


The 2005 Spectra heating system comprises 4 main components and its associated wiring.

1. Blower Relay- supplies power to the blower motor when the key is in the on position

2. Blower motor- Located in the right side dashboard area near the passengers right foot. ( photo attached)

3. Resistor- located on the ground side of the circuit to control speeds 1 thru 3. Note" High speed bypasses this component.

4. A/C Control Module- This is the control pad in the dashboard with the blower speed controls.

The easiest way to diagnose this circuit is to split the circuit in half to determine if you have a power supply problem, ground control problem or a failed component. From your concern I am going to assume that none of the speeds work. If some of the speeds work let me know which ones and I will revise the diagnosis tree I made for you.

Key state for all tests is Key on/Engine off. Heater on and blower setting between 1 and 4.

Step 1. Verify the 30Amp blower fuse in the underhood fuse box has power and is not "Blown.

Step 2. Locate the blower motor by removing the lower kick panel on the passenger side dashboard and glove box. You will need a Phillips head screwdriver.

Step 3. Disconnect the two pin connector at the blower Connector G-02 in the attached photo. The red and blue wire is the power supply wire to the motor so with the key on/engine off check for power with a test light or volt meter. Spec: Battery Voltage. If good proceed to step 4. If no power proceed to step

Step 3.a.- the blower relay above the blower (connector G-06) and verify you have power leaving the relay. This is the red and blue wire ( Pin 4) I attached a photo of the connector to help locate the correct wire. If you have power at this pin the relay is working and you have an open between the relay and the blower motor. If you do not have power at this pin proceed to step 3.b. Verify that the relay clicks when you disconnect it from the harness and plug it back in. If it "clicks" and you have no power at pin 4 you have a bad relay. If it does not click you will need to check the power supplies to the relay. These are pins 3 (blue wire) and Pin 5 (Red wire). Be careful to check the correct blue wire as the other blue is the ground for the relay. (Pin 1). If you do not have power at either wire you have an open in the harness and further diagnosis will be needed. If you do have power at these wires then check the remaining blue wire for a ground. If you do not have a ground you may have a bad control module. To check this remove the plastic cover around the control head and radio and remove the control head from its mounting but leave plugged in to the harness. Check the white and blue wire in pin 21 of the large connector. It is located 3 pins in from the bottom left of the connector. (See attached photo). If you do not have a ground then you have a bad control module. To verify this you can ground this wire with a test light or fused wire and see if the relay "Clicks". If you do have a ground at this pin then you have an open between the relay and control head.

Step 4. - Ground check- Go to the blower motor connector and check the green and red ground wire (Pin 2) for a ground with the blower switch set to 4. This bypasses the resistor easing diagnosis. If you have a ground then the blower motor is at fault. If you do not have a ground proceed to step 5.

Step 5. Access the control head large connector. Leaving it plugged into the control head check pin 23 (Yellow black wire in the lower left corner of the connector) and verify you have a ground. If you do not have a ground you have a faulty control module. If you do have a ground you have an open between the blower motor and the control head requiring further diagnosis. simplesol907.jpgsimplesol907_0.jpgsimplesol907_1.jpgsimplesol907_2.jpgsimplesol907_3.jpg

Jan 08, 2011 | 2005 Kia Spectra

2 Answers

My heat has stop blowing. replaced blower, and heater on off switch. what else could it be?


LX? DX? EX? Hatchback? sedan? wagon?coupe? engine size? did you check the fuse? Fuse #19, 30 amps in the auxilary fuse box (your owners manual may show the location ,it may be near the blower ?). The Blue/White wire at the heater blower motor should be HOT (12v) with key on. If you ground the Blue/Black wire the motor should run full speed.

Dec 17, 2010 | 1991 Honda Civic

1 Answer

2001 dodge caravan Ac comes on but will not blow ay any speed . I replaced blower motor resistor.


try tapping the bottom of the blower motor with the blower motor speed selector turned to high and the key on. If the blower motor starts working replace it.

Another thing you can try is unplugging the blower motor and supplying your own power and ground wires to the blower motor. It doesn't matter what pin on the blower motor you supply power or ground. It will work either way. If it doesn't than replace the blower motor. If it does you might have a bad control head.

You could also have a bad blower motor relay or blower motor fuse located in the underhood fuse block. There should be power at the dark blue wire at the blower motor with the key on and the fan speed set to any position.

here's a how to article I did on blower motor operation.

blower motor does not work

Nov 17, 2010 | 2001 Dodge Caravan

2 Answers

2005 grand caravan; rear blower motor is working, but the front blower is not even though the lights on the swith are working. Is this the resistor?


Access the blower motor resistor board located behind the glove box. Take a jumper wire and ground each of the Dark Blue wires that have tracers on them one at a time. Caution: do not ground out the plain Dark Blue wire or a fuse will blow. As each wire (with the tracer) is grounded, the blower motor should run at a different speed. If it does not, the resistor board has failed.

Jan 06, 2010 | 2005 Dodge Grand Caravan

1 Answer

My 94 integra ls not blowing air. when i turn on the ac the compressor comes on but blower does not. i need a diagram of the ac/heater blower motor


Hello! Here is a test procedure to isolate the fault in the blower motor circuit. Make sure ignition key is off...Remove the glove box...
Located on top of the blower assembly box is a connector with the following wires; Blue, blue/white, blue/ yellow, and blue/black. The device that the plug was connected to is called the resistor pack. Two screws hold it in place. Remove the resistor pack and check it for open or burnt resistors. If it is defective purchase a new one. Average cost is $25. If the fan motor did not run in the high position then more testing is required. If the air conditioner dash light comes on when you select A/C that eliminates the A/C switch. Next set the fan speed to first position. Place your ohm meter on the X10 scale and measure between the blue wire to ground...set fan speed to next position; measure between blue/white to ground...set next position; measure between blue/yellow to ground. Set fan to high position; measure between blue/black to ground. All readings should be zero ohms (full meter deflection). If they are not then the fan speed selector switch needs to be replaced. If all readings are correct then replacing the resistor pack will solve your problem.


Guru...saailer

Dec 13, 2009 | Acura Integra Cars & Trucks

1 Answer

The heat will not work. No heat.


So you have power to the control unit and the blower motor. Did you check the blower motor resistor? That controls the blower on all speeds except for high speed. Did you check all the grounds? Don't rule out a faulty ground. Make sure the blower motor is properly grounded.

Sep 02, 2009 | 1991 Ford Escort

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