Communication Line With Cooling Fan ECU

Circuit Description
When the magnetic clutch relay is ON and the required outlet air temp. is below 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:

Inspection Procedure

Step 1:

Step 2:

Step 3: