Turn the ignition switch ON.
Manually operate the control switch and measure the voltage of the blower motor.
Select the control switch to raise the voltage until high speed.
Fan Speed (Manual) | Motor Voltage (V) | |
MANUAL FAN SPEED | AUTO FAN SPEED | |
1 | 3.4 | Auto Low (4.0) |
2 | 4.6 | 4.0 ~ 5.5 |
3 | 5.9 | 5.5 ~ 6.7 |
4 | 7.2 | 6.7 ~ 7.7 |
5 | 8.3 | 7.7 ~ 8.9 |
6 | 9.5 | 8.9 ~ 10.1 |
7 | 11.3 | 10.1 ~ Auto Hi (11.3) |
8 | B+ | |
* MANUAL FAN SPEED : (3.4V ~ B+)
* AUTO FAN SPEED : (4.0V ~ B+)
If the measured voltage is not within specification, substitute with a known-good power mosfet and check for proper operation.
If the problem is corrected, replace the power mosfet.
Disconnect the negative (-) battery terminal.
Disconnect the connector (A) and then remove the power mosfet (B) after loosening the mounting screws.
Install in the reverse order of removal.
