A/C Switch and Compressor Clutch Relay

ECU Pin Connectors:

To test the Air Conditioning Signal to the ECU, disconnect the ECU connector and locate pin A-2 on the ECU connector and test for the presence of power with the A/C switch in the "on" position. Battery voltage should be available with the switch in the "on" position and 0 volts should be present in the "off" position. If there is no power at the ECU, the air conditioning circuits should be checked. Refer to HEATING, VENTILATION AND AIR CONDITIONING.