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Hello Sanda. The blower speed system on your car goes through a resistor to give various speeds. The reason it still works on high is that when set on high it doesn't go through that resistor. It gets direct battery voltage. The resistor is not too expensive and easy to replace.
Open the glove box.
Flex both sides of the glove box bin inward near the top far
enough for the rubber glove box stop bumpers to clear the sides of the
glove box opening, then roll the glove box downward.
Reach through the glove box opening to access and disconnect the
instrument panel wire harness connector for the blower motor resistor
from the resistor connector receptacle.
Reach through the glove box opening to access and disconnect the blower motor pigtail wire connector from the resistor connector receptacle.
Remove the two screws that secure the blower motor resistor to the evaporator housing.
Remove the blower motor resistor from the evaporator housing.
It is located on top of the heater box in the passenger side remove the glove box to gain acess there are two 7mm srews and a relay braket holding it in place it is a tight squeeze but can be removed with a 1/4 inch ratchet. source: fixya thanks for using fixya Hope this helps
replace the blower motor resistor. It controls the fan speeds. It defaults to high speed only when it fails.
How to replace the blower motor resistor block:
Caution: Stay clear of the blower motor and resistor block (Hot). Do not operate the blower motor with the resistor block removed.
1. Disconnect and isolate the battery negative cable. 2. Remove the glove box from the instrument panel. 3. Pull out the lock on the blower motor resistor wire harness connector to unlock the connector latch. 4. Depress the latch on the blower motor resistor wire harness connector and disconnect the connector from the resistor. 5. Remove the two screws that secure the blower motor resistor block to the HVAC housing. 6. Remove the resistor block from the HVAC housing.
Installation: 1. Position the blower motor resistor block into the HVAC housing. 2. Install the two screws that secure the resistor block to the HVAC housing. Tighten the screws to 2.2 Nm (20 in. lbs.) 3. Connect the wire harness connector to the resistor block. 4. Push in the lock on the blower motor resistor wire harness connecgtor to lock the connector latch. 5. Install the glove box. 6. Reconnect the battery negative cable. 7. Have a nice day!
I do not have the diagram for you. but i can tell you how to change it! first, its behind glove box. to make things easier remove the glove box. remove insulating pad from underneath glove box, next loosen and slide the ecm to one side. now you can see resistor and blower motor. resistor is beside blower motor. remove wiring to resistor. take out the screws that hold it in. then pull it out of heater box. have a good day !!
check the blower motor resistor mounted next to the blower motor. behind the glove box. after removing the resistor test each terminal with a continuity tester .check between each input terminal(from the blower speed switch side) to the output terminal (to the blower) there should be continuity. if not replace the resistor.
I have ran into the same problem, there may be something has got into fan cage. remove fan motor and investagate to see if it is blocked, or if fan is going bad. it is behind glove box, to remove. remove lower right dash insulator panel from under glove box. slide bcm aside for room to get at fan motor. remove 3 screws from fan motor, and remove fan after disconnecting wiring. the blower motor resistor is beside fan motor. the resistor will make ya lose 1 and 2 speeds. for it is a 5 step resistor.