11/19/2023 0 Comments Ac power transistor honda civic![]() If there are no blower motor control problems, testing of the A/C request circuit will be necessary. If the blower motor does not operate, the power transistor is faulty. Another test is to remove the blue/yellow wire from the power transistor connector and apply battery voltage to the blower motor power transistor for a very short period of time. If there is voltage on the blue/yellow wire and the blower motor does not operate, the blower motor power transistor is faulty (some heater control panels will only output voltage for a few seconds and then set a code).ĥ. The more voltage the heater control panel outputs, the faster the blower motor should operate.Ĥ. The transistor then turns on and provides a ground for the blower motor. When the heater control panel is on and is trying to operate the blower motor, it should output a voltage on the blue/yellow wire to the base of the blower motor power transistor. Next, test the blue/yellow wire at the blower motor transistor this is the command from the heater control panel/climate control unit. If the blower motor is good, jump the blue/black wire at the blower motor power transistor to the black wire and verify the blower motor operates this tests the blower motor wiring and also indicates the black wire of the power transistor has a good ground.ģ. If so, ground the blue/black wire at the blower motor and verify the blower motor operates.Ģ. ![]() Verify there is battery voltage to the blower motor on the blue/white wire. To test the blower power transistor circuit:ġ. With either system, the blower motor circuit testing is the same. Most blower motor power transistors have four wires, but there are some systems that use three wires and have a separate relay for high speed. The blower motor power transistor is located in the same place as the blower motor resistor used to be. ![]() If there is a code for the blower motor circuit and the blower motor does not work on any or all of the speeds, testing the blower motor power transistor and the blower motor circuit is the first step in repairing the A/C problem. If there are no codes present, continue testing the A/C request circuit as usual. When a code is indicated, diagnose the code before testing the A/C request circuit (our Direct-Hit Hotline Archives explain how to check the A/C system for codes). To save time, first check the heater control panel for codes. When a later model Honda comes into your shop with no power to the A/C compressor clutch, verify that the relay and fuses are good, and then check to see if a scan tool indicates the A/C request is off. If you are not familiar with this problem, you may waste time trying to diagnose the compressor operation. When the blower motor does not operate on later model A/C systems, the heater control panel will set a code which in turn shuts off the request for A/C compressor operation. Now, when the blower motor power transistor fails, the air conditioning (A/C) compressor will become inoperable. In the late 1990’s, Honda automobiles started using a blower motor power transistor to control the speeds of the blower motor instead of the traditional blower motor resistor.
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