Workshop Manuals Factory service & repair Lancia
Lancia Thesis Factory Service Manual (2002-2009)22 · Fault diagnosis
22 · Diagnostics

Front passenger seat heating not working

Make
Lancia
Model
Thesis Factory Service Manual
Year
2002–2009
Section
Seats › Front passenger seat heating not working
Fault diagnosisFront passenger seat heating not working

FRONT PASSENGER SEAT HEATING NOT WORKING

the front passenger seat heater pad and potentiometer are connected to a control module located under the seat

The seat heater pad consists of two elements, fitted in the seat and in the backrest, controlled in parallel by the control module

The heater pad in the seat has an NTC sensor for controlling the temperature.

STEPOPERATIONS TO BE CARRIED OUTTEST RESULTS
1ELECTRICAL SYSTEM CHECKALL OKPROBLEMS ENCOUNTEREDACTION

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 Step1. no positiveMove on to Step
2. no earthMove on to Step
2ELECTRICAL SYSTEM CHECKALL OKPROBLEMS ENCOUNTEREDACTION

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 StepElectrical equipment faulty

Restore the electrical connection.

(Wiring Diagram ) E3075 HEATED SEATS

3ELECTRICAL SYSTEM CHECKALL OKPROBLEMS ENCOUNTEREDACTION

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 StepElectrical equipment faulty

Restore the electrical connection

(Wiring Diagram ) E3075 HEATED SEATS

4COMPONENT CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check the operation of the temperature selectorMove on to StepTemperature selector brokenReplace the temperature selector
5ELECTRICAL SYSTEM CHECKALL OKPROBLEMS ENCOUNTEREDACTION

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 StepElectrical equipment faulty

Restore the electrical connection

(Wiring Diagram ) E3075 HEATED SEATS

6COMPONENT CHECKALL OKPROBLEMS ENCOUNTEREDACTION

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 Step1. Heater pads broken1. Replace the heater pads
2. Sensor broken2. Replace the seat heater pad.
7CHECK ON CORRECT OPERATIONALL OKPROBLEMS ENCOUNTEREDACTION
Check that the fault is no longer presentFault persistsReplace the control module

Parts & tools for this job For 2002 Lancia Thesis

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