Ignition "ON".
Manually operate the control switch and measure the voltage of blower motor between pin 1 and 2.
Operater the blower motor control and measure the voltage output.

Fan  | Voltage  | 
Manual  | |
First speed  | 4.0 ± 0.5V  | 
Second speed  | 5.1 ± 0.5V  | 
Third speed  | 6.2 ± 0.5V  | 
Fourth speed  | 7.3 ± 0.5V  | 
Fifth speed  | 8.4 ± 0.5V  | 
Sixth speed  | 9.5 ± 0.5V  | 
Seventh speed  | 10.5 ± 0.5V  | 
eighth speed  | Battery(+)  | 
*AUTO COOLING : Auto speed (4.5V~B+)
*AUTO HEATING : Auto speed (4.5V~10.5V)