Hyundai Sonata: Blower / Power Mosfet Repair procedures

Hyundai Sonata LF 2014-2019 Service Manual / Heating, Ventilation and Air Conditioning / Blower / Power Mosfet Repair procedures

Inspection

1.	Turn the ignition switch ON.

2.	Manually operate the control switch and measure the voltage of the blower motor.

Select the control switch to raise the voltage until high speed.

Specification

Fan Speed (Manual)	Motor Voltage (V)
1	4.05
2	5.24
3	6.44
4	7.63
5	8.82
6	10.02
7	11.21
8	13.60

Diagnosis With GDS

The heating, ventilation and air conditioning can be quickly diagnosed failed parts with vehicle diagnostic system (GDS).

? The diagnostic system (GDS) provides the following information.

(1) Self diagnosis: Checking the failure code (DTC) and display.

(2) Current data: Checking the system input/output data state.

(3) Actuation test: Checking the system operation condition.

(4) Additional function: Other controlling such as he system option and zero point adjustment.

2.	Select the 'Car model' and the system to be checked in order to check the vehicle with the tester.

3.	Select the 'Current data" menu to search the current state of the input / output data. The input / output data for the sensors corresponding to the Power Mosfet can be checked.

4.	To perform compulsory operation on Power Mosfet input factors, select "ACTUATION TEST".

Replacement

1.	Disconnect the negative (-) battery terminal.

2.	Remove the cowl side trim. (Refer to Body - "Cowl Side Trim")

3.	To remove the crash pad under cover [RH] (A), press both sides of the locking pin and then pull it down.

4.	Disconnect the under lamp connector (A).

5.	Remove the passenger's side shower duct (A) after loosening the screw.

6.	Disconnect the power mosfet connector (A) and then remove the power mosfet (B) after loosening the mounting screws.

7.	Install in the reverse order of removal.

Power Mosfet Description and Operation

Description It is installed to the DATC and adjusts the fan rpm by precisely controlling the voltage applied to the blower motor. ...

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