Power MOSFET Repair Procedures

Inspection

1. 1
   Turn the ignition on.
2. 2
   Manually operate the control switch and measure the voltage of the blower motor.
3. 3
   Select the control switch to raise the voltage to high speed.

   

   Specification

   Blower Speed (Manual)	Motor Voltage (V)
   1	3,8 ± 0,5
   2	5,0 ± 0,5
   3	6,1 ± 0,5
   4	7,3 ± 0,5
   5	8,5 ± 0,5
   6	9,7 ± 0,5
   7	10,9 ± 0,5
   8	Battery

Diagnosis Using GDS

1. 1
   The heating, ventilation, and air conditioning system faults can be quickly diagnosed using the Global Diagnostic System (GDS). ※ The GDS provides the following information: (1) Self-diagnosis: Check and display of diagnostic trouble codes (DTC). (2) Current data: Check the input/output status of system data. (3) Active test: Check the operating status of the system. (4) Additional functions: Other controls such as system option and zero point adjustment.
2. 2
   Select "Vehicle Model" and the system to be checked to inspect the vehicle with the tester.
3. 3
   Select the "Current Data" menu to check the current input/output data status. The input/output data for the sensors corresponding to the Power MOSFET can be checked.

   

4. 4
   To perform a forced operation on the Power MOSFET input factors, select "ACTUATOR CHECK".

   

Replacement

1. 1
   Disconnect the negative (-) battery terminal.
2. 2
   Disconnect the Power MOSFET connector (A), then remove the MOSFET (B) after loosening the mounting screws.

   

3. 3
   To install, reverse the removal procedure.