Climate control not working (under any circumstances)

Make: Fiat
Model: Bravo Factory Service Manual
Year: 2007–2014
Section: Climate control › Climate control not working (under any circumstances)

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Fault diagnosisClimate control not working (under any circumstances)

CLIMATE CONTROL NOT WORKING (UNDER ANY CIRCUMSTANCES)

Automatic air conditioning

When the on/off switch is pressed, the climate control does not work.

0	PRELIMINARY CHECKS	ALL OK	PROBLEMS ENCOUNTERED	ACTION
		TEST RESULTS
	Check: - the condition of climate control system protective fuses; See E6020 AIR CONDITIONING - that the climate control system gas pressure is correct See Test 5040OB AIR CONDITIONING SYSTEM OPERATION CHECK (PRESSURE) - the correct operation of the engine cooling fan.	Move on to Step 1	1. Fuses blown 2. Relay damaged 3. Gas pressure not correct 4. Incorrect operation of engine cooling fan.	1. Change the blown fuses 2. Replace the relay 3. Search for and eliminate leaks and top up climate control system to correct level 4. Carry out See Test 5040AB REFRIGERANT CIRCUIT CHECK
1	CHECK ON OPERATION OF COMPRESSOR BY CLIMATE CONTROL SYSTEM CONTROL UNIT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the following conditions: with the ambient temperature at least 5 °C and the outside temperature reading above 5 °C, with the engine started and the compressor on (check that the snowflake symbol in the display lights up), set the control unit to the AUTO position, the temperature to maximum cold LO and the distribution to the front position. Also check that there are no short circuits to earth for the compressor circuit or any errors on the CAN line by connecting the diagnostic equipment. Under these conditions, check that the compressor comes on, by opening the bonnet and taking a look.	End of diagnosis	1. The snowflake symbol in the display does not light up (but the compressor is on). 2. The LED with the snowflake symbol comes on (but the compressor does not switch on). 3. The outside temperature reading is incorrect. 4. Compressor short circuit. 5. Errors in CAN line.	1. Move on to Step 3 2. Move on to Step 2 3. Move on to Step 3 4. Move on to Step 3 5. Move on to Step 4
2	CHECKS USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Keeping the diagnostic equipment connected, check that there are no errors: - at the climate control node; - at the engine management control unit.	Move on to Step 3	1. Climate control node not working. 2. The engine management control unit is not working.	1. Move on to Step 4 2. Continue as instructed by the diagnostic equipment.
3	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Keeping the diagnostic equipment connected, check the following at the Climate Control Node: - that there are no errors at the compressor operating relay- that there are no errors at the climate control system pressure sensor- that there are no errors at the outdoor temperature sensor - that there are no errors at the demisting sensor - that there are no errors at the fan - the condition of the compressor operating wiring (no short circuits or open circuits). Keeping the diagnostic equipment connected, enter active diagnosis and check that all the graphic symbols in the display come on following the self test procedure.	Move on to Step 5	1. Relay not working. 2. Error in the linear sensor. 3. Error (short circuit or open circuit) at the outside temperature sensor. 4. Error at the outside temperature sensor. 5. Error (short circuit or open circuit) at the demisting sensor 6. Error at the demisting sensor. 7. Short circuit error at the fan. 8. Fan operating error. 9. Compressor wiring broken. 10. The snowflake icon does not light up on the display, nor does the LED on the button (but the compressor is on)	1. Replace the relay 2. Carry out See Test 5040BC CHECK ON CLIMATE CONTROL COMPRESSOR ACTIVATION/DEACTIVATION FROM LINEAR SENSOR 3. Restore the correct wiring for the outside temperature sensor See E6020 AIR CONDITIONING 4. Replace the outside temperature sensor 5. Restore the correct wiring for the demisting sensor See E6020 AIR CONDITIONING 6. Replace the demisting sensor. 7. Check the electrical connections See E6020 AIR CONDITIONING 8. Move on to Step 6 9. Restore the correct wiring See E6021 COMPRESSOR ENGAGEMENT 10. Replace the climate control system control unit Op. 5040D15 FOG LIGHT TRIM - R.R.
4	CHECK ON CLIMATE CONTROL NODE ELECTRICAL CONNECTIONS	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	With the engine switched off, remove the control unit from the dashboard mounting Op. 5040D15 FOG LIGHT TRIM - R.R. and disconnect the cable connector from the control unit, visually inspecting for any damage at the connector contacts, and reconnect it correctly to check for any false contacts.	Move on to Step 5	1. Electrical connections loose or damaged. 2. The electrical connections are loose.	1. Restore the loose or damaged electrical connections See E6020 AIR CONDITIONING 2. Replace the climate control system control unit Op. 5040D15 FOG LIGHT TRIM - R.R.
5	CHECK ON CORRECT OPERATION OF CLIMATE CONTROL SYSTEM CONTROL UNIT FAN	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	With the engine started, set the climate control system control unit to the AUTO position, adjust the temperature to 22 °C, place the recirculation at the outside air intake and the distribution to the front position. Adjust the fan button (+ side) gradually, increasing the speed set and then decrease the speed using the button (- side), thereby checking the effect of the air flow rate variation.	End of diagnosis	There is no variation in the air flow rate	Move on to Step 6
6	CHECK ON ELECTRICAL CONNECTIONS AND FAN OPERATION	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check whether the electrical wiring connections are loose. Disconnect/reconnect the connection to the engine mounting. Disconnect the connector and connect it to a feeder. Under these conditions the engine should turn at maximum speed, indicating that the operating module is not working.	End of diagnosis	1. Electrical connections loose. 2. The fan does not work. 3. The operating module does not work.	1. Renew the correct connections See E6020 AIR CONDITIONING 2. Replace the fan Op. 5040C30 AIR CONDITIONING FAN - R.R. 3. Replace the fan operating module

Manual Air Conditioning

When the on/off switch is pressed, the climate control does not work.

0	PRELIMINARY CHECKS	ALL OK	PROBLEMS ENCOUNTERED	ACTION
		TEST RESULTS
	Check: - the condition of the climate control system protective fuses; See E6020 AIR CONDITIONING - that the climate control system gas pressure is correct See Test 5040OB AIR CONDITIONING SYSTEM OPERATION CHECK (PRESSURE) - the correct operation of the engine cooling fan.	Move on to Step 1	1. Fuses blown 2. Relay damaged 3. Gas pressure not correct 4. Incorrect operation of engine cooling fan.	1. Change the blown fuses 2. Replace the relay 3. Search for and eliminate leaks and top up climate control system to correct level 4. Carry out See Test 5040AB REFRIGERANT CIRCUIT CHECK
1	CHECK ON COMPRESSOR OPERATION BY MANUAL CONTROL	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the following conditions: with the ambient temperature at least 5 °C, with the engine started and the compressor on (check that the snowflake symbol on the display and the LED on the button light up), set the temperature to maximum cold and the distribution to the front position. Also check that there are no short circuits to earth for the compressor circuit by connecting the diagnostic equipment. Under these conditions, check visually that the compressor comes on, by opening the bonnet.	End of diagnosis	1. The snowflake symbol in the display does not light up (but the compressor is on). 2. The LED with the snowflake symbol comes on (but the compressor does not switch on). 3. Compressor short circuit.	1. Move on to Step 4 2. Move on to Step 2 3. Move on to Step 3
2	CHECKS USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Connect the Examiner diagnostic equipment and check that there are no errors at the Engine Management Control Unit	Move on to Step 3	The engine management control unit does not give the go ahead.	Continue as described by the diagnostic equipment
3	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Keeping the diagnostic equipment connected, check: - that there are no errors at the compressor operating relay; - that there are no errors at the climate control system pressure sensor; - that there are no faults at the demisting sensor.	Move on to Step 5	1. Relay not working. 2. Error at the linear sensor 3. Error (short circuit or open circuit) at the demisting sensor. 4. Error at the demisting sensor.	1. Replace the relay 2. Carry out See Test 5040BC CHECK ON CLIMATE CONTROL COMPRESSOR ACTIVATION/DEACTIVATION FROM LINEAR SENSOR 3. Restore the correct wiring for the demisting sensor See E6020 AIR CONDITIONING 4. Replace the demisting sensor.
4	CHECK ON CLIMATE CONTROL SYSTEM CONTROL UNIT ELECTRICAL CONNECTIONS	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	With the engine switched off, remove the control from the dashboard mount and disconnect the cable connector, visually inspecting for any damage at the connector contacts, and reconnect it correctly to check for any false contacts.	Move on to Step 5	Electrical connections loose or damaged.	Renew the electrical connections See E6020 AIR CONDITIONING
5	CHECK ON CORRECT OPERATION OF FAN	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check whether the electrical wiring connections are loose See E6020 AIR CONDITIONING Disconnect, visually inspecting for any damage to the connector contacts. Reconnect the connection to the engine mounting. Check that it rotates at all speeds by activating it using the switch. Disconnect the connector for the fan and connect to a feeder. Under these conditions the motor should rotate at maximum speed, indicating that the operating module is not working	Move on to Step 6	1. Electrical connections loose or damaged 2. Fan not working. 3. Fan only turns at the maximum speed when supplied directly by the vehicle battery.	1. Renew the electrical connections See E6020 AIR CONDITIONING 2. Replace the fan Op. 5040C30 AIR CONDITIONING FAN - R.R. 3. Move on to Step 6
6	CHECK ON CORRECT OPERATION OF MAXIMUM SPEED RELAY	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check for loose electrical wiring connections and disconnect, visually inspecting for any damage to the connector contacts. Reconnect the connection to the resistor. Check that the fan is working at the maximum speed: if it only works at the maximum speed, the relay is broken. Check whether the resistor has blown by checking the electrical continuity	Move on to Step 7	1. Electrical connections loose or damaged. 2. Relay broken. 3. Resistance values faulty	1. Renew the electrical connections See E6020 AIR CONDITIONING 2. Replace the ceramic resistor Op. 5040C48 A/C FAN MOTOR RESISTOR - R+R 3. Replace the ceramic resistor Op. 5040C48 A/C FAN MOTOR RESISTOR - R+R
7	CHECK ON CORRECT OPERATION OF SPEED SELECTOR AT THE CLIMATE CONTROL SYSTEM CONTROL UNIT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check for loose electrical wiring connections and disconnect, visually inspecting for any damage to the connector contacts. Reconnect the connection to the selector at the climate control system control unit. Check whether the selector on the control unit is interrupted by checking the electrical continuity	Move on to Step 8	1. Electrical connections loose or damaged. 2. Fan not working. 3. Power supply to the relays not correct.	1. Renew the electrical connections See E6020 AIR CONDITIONING 2. Replace the speed selector knob 3. Replace the climate control system control unit
8	CHECK ON CORRECT OPERATION OF FAN MAXIMUM SPEED OPERATING RELAY	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check whether the electrical wiring connections are loose. Disconnect, visually inspecting for any damage to the connector contacts. Reconnect the connection to the relay. Check that the relay is working properly by providing it with a direct 12 V supply.	End of diagnosis	1. Electrical connections loose or damaged 2. Maximum speed operating relay not working	1. Renew the electrical connections See E6020 AIR CONDITIONING 2. Replace the maximum speed operating relay

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Parts & tools for this job For 2007 Fiat Bravo

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