L057 WINDSCREEN MISTING WITH THE FORMATION OF CONDENSATION (AUTOMATIC AIR CONDITIONING) - Alfa - 159 - eLearn

939003708 - L057 WINDSCREEN MISTING WITH THE FORMATION OF CONDENSATION (Automatic Air Conditioning)

On vehicles equipped with a windscreen demisting sensor, it does not work and the windscreen does not demist with the air conditioning on when there is condensation.

1	CHECK ON CORRECT OPERATION OF SENSOR	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the demisting sensor lens in the windscreen is not obstructed by foreign bodies or that it is not dirty or marked and that the windscreen is not dirty.	Move on to Step 2	1.Demisting sensor lens obscured by foreign bodies.	1. Remove the foreign bodies from the sensor.
			2. Demisting sensor lens dirty.	2. Clean the sensor lens.
			3. Demisting sensor lens scratched.	3. Replace the demisting sensorOp. 5010D36 DEMISTING SENSOR R R FOLLOWING ELECTRICAL CIRCUIT CHECK
			4. Windscreen dirty.	2. Clean the windscreen.
2	CHECK THAT THE PROXY HAS BEEN CARRIED OUT FOR THE SYSTEM	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Connect the Examiner diagnostic equipment and check that the Proxy has been carried out for the system to recognize the sensor.	Move on to Step 3	Proxy not carried out for the system to recognize the sensor.	Carry out the Proxy for the system.
3	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Connect the Examiner diagnostic equipment and check that there are no errors at the windscreen demisting sensor.If the result is negative, carry out the See Test 5040DB Check windscreen demister sensor operation	Move on to Step 4	1.Error in the demisting sensor: 0% or 100% according to the See Test 5040DB Check windscreen demister sensor operation	1. Move on to Step 5
			2. Error in the demisting sensor: 90% or 80% according to the See Test 5040DB Check windscreen demister sensor operation	2. Move on to Step 6
			3. Error in the demisting sensor: 10% according to the See Test 5040DB Check windscreen demister sensor operation	3. Replace the demisting sensorOp. 5010D36
4	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Keeping the Examiner diagnostic equipment connected, check: that there are no errors at the Climate Control Node; that there are no errors at the timing actuator.	Move on to Step 8	1. Error at climate control node.	1. Move on to Step 5.
			2. Short circuit to earth error at the distribution actuator.	2. Check that the Lin Bus cables are not caught between the metal parts (pay special attention to the gearbox bolts) and move on to Step 8.
			3. Short circuit to +12V error at the distribution actuator.	3. Check that the Lin Bus cables are not caught between the metal parts (pay special attention to the gearbox bolts) and move on to Step 8.
			4. Mechanical interference/stuck error.	4. Move on to Step 10.
5	CHECKS USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Keeping the Examiner diagnostic equipment connected, check the correct operation of the air mixture actuator through active diagnosis	Move on to Step 6.	Air mixture actuator not working	Move on to Step 8.
6	CHECK ON DEMISTING SENSOR ELECTRICAL CONNECTIONS	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check whether the windscreen demisting sensor electrical wiring connections are loose or damaged, disconnect/reconnect the wiring. Check the continuity/insulation of the sensor electrical wiring.	Move on to Step 7	1. Electrical connections loose or damaged.	1. Restore correct wiring.
		Move on to Step 7	2. Sensor wiring broken or short circuited.	2. Restore correct wiring.
7	CHECK ON THE CORRECT INSTALLATION OF THE DEMISTING SENSOR	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the demisting sensor is correctly positioned in its housing.	Move on to Step 8	Demisting sensor not correctly positioned.	Refit the sensor in the correct position.
8	CHECK ELECTRICAL CONNECTIONS	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check whether the electrical wiring connections between the Climate Control Node and the distribution actuator are loose/damaged.Disconnect/reconnect the connection to the Climate Control Node and to the actuator and to the demisting sensor.Check the continuity/insulation of the electrical connection between the Climate Control Node and the distribution actuator and the sensor.	Move on to Step 9	1.Electrical connections loose/damaged	1. Restore the correct wiring.
		Move on to Step 9	2.Electrical connection broken or not insulated.	2. Restore the continuity/insulation of the electrical connection.
9	CHECK ON CORRECT OPERATION OF DISTRIBUTION ACTUATOR	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the operation activating the function that the actuator should carry out manually.With the vehicle moving, switch on the passenger compartment fan at the maximum speed (6 bars on the display), place the flaps in the max. def. position using the control/control unit (manually) and check the air flow in the passenger compartment by placing your hand over the vents.	End of diagnosis	Flow of air to the windscreen insufficient.	Replace the distribution actuator Op.
10	DISTRIBUTION ACTUATOR FLAP CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the actuator flap completes its travel without any impediment.	End of diagnosis	1. Flap travel incomplete.	1. Free the air mixture actuator flap from the impediment.
			2. Flap damaged.	2. Replace the flap.
			3. Kinematic mechanism / components damaged.	3. Repair kinematic mechanism.