O23 (LEFT OR RIGHT) REAR SEAT HEATING NOT WORKING - Lancia - THESIS - eLearn

374119 - O23 (LEFT OR RIGHT) REAR SEAT HEATING NOT WORKING

the heater pads and temperature selectors for the rear seats are connected to two control modules located under the seats.The temperature selectors are located in the rear seat centre armrest.The seat heating consists of two elements fitted in the seat and the backrest controlled in parallel by the control moduleThe heater pad in the seat has an NTC sensor for controlling the temperature.

STEP	OPERATIONS TO BE CARRIED OUT	TEST RESULTS
1	ELECTRICAL SYSTEM CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Remove the seat from the fastening points maintaining the electrical connections.Check for a supply positive and earth at the control module connector. (Wiring Diagram ) E3075 HEATED SEATS	Move on to Step	1. no positive	Move on to Step
		Move on to Step	2. no earth	Move on to Step
2	ELECTRICAL SYSTEM CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check: the continuity/insulation of the supply lead between the control module and the rear seat coupling the continuity/insulation of the supply lead between the rear seat coupling and the luggage compartment junction unit. the continuity of the earth lead between the control module and the rear seat coupling the continuity of the earth lead between the rear seat coupling and right rear earth (Wiring Diagram ) E3075 HEATED SEATS	Move on to Step	Electrical equipment faulty	Restore the electrical connection. (Wiring Diagram ) E3075 HEATED SEATS
3	ELECTRICAL SYSTEM CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Disconnect the seat electrically and check the continuity of the connections at the temperature selector between the coupling for the rear armrest backrest and the control module. (Wiring Diagram ) E3075 HEATED SEATS	Move on to Step	Electrical equipment faulty	Restore the electrical connection (Wiring Diagram ) E3075 HEATED SEATS
4	COMPONENT CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the operation of the temperature selector	Move on to Step	Temperature selector broken	Replace the temperature selector
5	ELECTRICAL SYSTEM CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the electrical connection between Control module and seat heater pad Control module and seat heater pad sensor Control module and backrest heater pad Heater pads and earth (Wiring Diagram ) E3075 HEATED SEATS	Move on to Step	Electrical equipment faulty	Restore the electrical connection (Wiring Diagram ) E3075 HEATED SEATS
6	COMPONENT CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check: the resistance of the heater pads (about 5.5 ohm at 20 degrees) the resistance of the heater pad sensor (about 1kohm at 20 degrees)	Move on to Step	1. Heater pads broken	1. Replace the heater pads
		Move on to Step	2. Sensor broken	2. Replace the seat heater pad.
7	CHECK ON CORRECT OPERATION	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the fault is no longer present		Fault persists	Replace the control module