Communication Line With Cooling Fan ECU

CIRCUIT DESCRIPTION
When the magnetic clutch relay is ON and the required outlet air temperature is a predetermined value, the A/C control assembly turns ON Tr1 inside the ECU. (Terminal voltage at the CFAN terminal is almost 0 V).

As a result , the cooling fan ECU increases the speed of the cooling fan as required and increases the cooling performance of the condenser.

Wiring Diagram:

Step 1 - 2:

Step 3:

INSPECTION PROCEDURE