O22 FRONT PASSENGER SEAT HEATING NOT WORKING - Lancia - THESIS - eLearn

374116 - O22 FRONT PASSENGER SEAT HEATING NOT WORKING

the front passenger seat heater pad and potentiometer are connected to a control module located under the seatThe seat heater pad consists of two elements, fitted in the seat and in 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 passenger seat coupling the continuity of the earth lead between the passenger side control module and the passenger seat coupling the continuity of the earth lead from the passenger seat coupling to the passenger side dashboard earth (Wiring Diagram ) E3075 HEATED SEATS the continuity/insulation of the supply lead from the passenger seat coupling to the luggage compartment junction unit.	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
	Electrically disconnect the seat, remove the control panel and check the electrical connection between the temperature selector 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