Ignition "ON"
Manually operate the control switch and measure the voltage of blower motor between pin 1 and 2.
Select the control switch to raise voltage until high speed.
Fan | Motor Voltage |
Manual | |
First speed | 3.8 ±0.5V |
Second speed | 4.9 ±0.5V |
Third speed | 6.1 ±0.5V |
Fourth speed | 7.2 ±0.5V |
Fifth speed | 8.3 ±0.5V |
Sixth speed | 9.5 ±0.5V |
Seventh speed | 10.6 ±0.5V |
eighth speed | BAT(+) |
*AUTO COOLING: Auto speed (4.5V~B+)
*AUTO HEATING: Auto speed (4.5V~10.5V)
If the measured voltage is not specification, substitute with a known-good power transister and check for proper operation.
If the problem is corrected, replace the power transister.
Disconnect the negative (-) battery terminal.
Disconnect the power transister connector (A) at the connecting part between heater and blower unit.
Remove the power transister(B) after loosening the mounting screws.
Installation is the reverse order of removal.
