With additional wires, apply voltage from the battery to the contacts and connector of the fan motor. If the fan motor is spinning, then it is good.
Turn on the fan operation modes in sequence AUTO → LOW → HIGH → AUTO and measure the voltage on pins 1 and 2 of the connector.
Fan | Voltage, V |
First speed | 3,8 |
Second speed | 5,3 |
third speed | 6,7 |
fourth speed | 8,1 |
Fifth speed | 9,5 |
sixth speed | 10,6 |
seventh speed | 13,5 |