Ventilation Fan Motor Not Functioning/Control Incorrect

Symptom
Ventilation fan motor not working
Faulty control of ventilation fan motor.

Action
1 Check that fuse 6 in fuse board 22A is intact.
2 Connect the ISAT scan tool and read "FAN CONTROL VOLTAGE". The correct values should be 0-5 volts, where 0 V is a stationary fan and 5 V is full speed.
Manually step up fan speed on the Automatic Climate Control (ACC) control module panel. At the same time, read the value for control voltage.
If there is no voltage, proceed to "Action Before Changing A Control Module". Before Changing a Control Module
If there is voltage, unplug the fan control module connector. Ground pin 3 with the ignition on.
The fan should now run at full speed.
If the fan runs at full speed, proceed to point 3.
If the fan does not run at full speed, check that there is battery positive voltage to pin I in connector H2-7 to the fan motor.
Check the lead between pin 2 in connector H2-7 and pin 3 in the fan control module connector for open circuit.
If the fault remains, change the fan motor.







3 Unplug the fan control module connector and measure the resistance between pin 4 and ground. Check the wiring harness for open circuit.
Localize and remedy the fault.
Unplug the fan control module connector with the ignition on. Measure the voltage to pin 2. The correct value is 0 - 5 volts.
If there is no voltage, check the cable assembly between pin 2 in the fan control module connector and pin 20 in the ACC control module connector for open/short circuits to ground.
Measure the voltage on pin 1 in the fan control module connector. The correct voltage is about 12 V.
If there is 12 V, change the fan control module.
If there is no voltage, check the wiring harness between pin 1 in the fan control module connector and pin 17 in the ACC control module connector for open/short circuit to ground.
If the fault remains, proceed to "Action Before Changing A Control Module". Before Changing a Control Module