Fiat MULTIPLA 1.9 JTD 8V fino a 05/99 – ADDITIONAL HEATER – – Euro 3 – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION

Wiring diagram

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Components

Component code	Name	Assembly reference
A1	Battery	A10	Alternator	A10	Alternator	B105	Additional heater remote control receiver fuse	-
B37	Fuse (MAXI FUSE) spark plug and diesel preheating	-
B37	Fuse (MAXI FUSE) spark plug and diesel preheating	-
B38	Fuse for supplementary heater	-
C20	Passenger side dashboard earth	-
D1	Front/facia junction	-
D4	Front/engine junction	-
D4	Front/engine junction	-
D8	Air conditioning heater front coupling	-
D8	Air conditioning heater front coupling	-
D22	Additional heater junction	-
H80	Climate control system controls	J36	Additional heater relay	-
K79	Additional heater outside air temperature sensor	-
K79	Additional heater outside air temperature sensor	-
M70	Climate control system control unit	M72	Fan speed transformer	M72	Fan speed transformer	M74	Additional heater remote control receiver	-
M74	Additional heater remote control receiver	N85	Passenger compartment ventilation fan	R10	Multiple tester connection	-

Location of components

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Components

Component code	Name	Assembly reference
A1	Battery	A10	Alternator	A10	Alternator	B105	Additional heater remote control receiver fuse	-
B37	Fuse (MAXI FUSE) spark plug and diesel preheating	-
B37	Fuse (MAXI FUSE) spark plug and diesel preheating	-
B38	Fuse for supplementary heater	-
C20	Passenger side dashboard earth	-
D1	Front/facia junction	-
D4	Front/engine junction	-
D4	Front/engine junction	-
D8	Air conditioning heater front coupling	-
D8	Air conditioning heater front coupling	-
D22	Additional heater junction	-
H80	Climate control system controls	J36	Additional heater relay	-
K79	Additional heater outside air temperature sensor	-
K79	Additional heater outside air temperature sensor	-
M70	Climate control system control unit	M72	Fan speed transformer	M72	Fan speed transformer	M74	Additional heater remote control receiver	-
M74	Additional heater remote control receiver	N85	Passenger compartment ventilation fan	R10	Multiple tester connection	-

DescriptionThe vehicle is fitted with an autonomous additional heater in case the passenger compartment needs to be heated more quickly, with the engine running, if the climatic conditions are particularly harsh.The system basically consists of:a heater unit fixed to the front suspension crossmember and the underbody floor panelan electric fuel pump fixed to the underbody near the fuel tankan outside air temperature sensor positioned under the left front light clusteran exhaust pipe connected directly to the heater unitAn electronic control unit integrated in the unit controls the switching on, the maintenance and the switching off of the heater.The ignition of the mixture is guaranteed by a spark plug, the combustion is ensured by the air coming from a special fan and the fuel coming from an electric metering pump. The heat produced in the combustion chamber is surrendered to the engine coolant which comes into contact with it. The exhaust gases are expelled through a special exhaust pipe. For more details, 2888277see DESCRIPTION AND OPERATION:5020Msupplementary independent heaterThe additional heater circuit is protected by a specific fuse, located in the engine compartment in the relay and fuse box.The system only works with the engine running.

Functional description The additional heater unit is connected to the vehicle electrical system through connector D22 . This connector, pin 2, receives a direct supply through the line protected by the maxifuse B37 , which also supplies the diesel pre-heating system and by a specific fuse B38 ; pin 3 is earthed. Pin 1 of D22 is connected to the outside air temperature sensor K79 which, in turn, receives the reference supply from the alternator (D+ pin signal): in this way the signal for the outside temperature is only sent to the additional heater control unit if the engine is running. The additional heater control unit is equipped with an autodiagnostic system which can be used: by connecting the unit to connector R10 : it receives signals from pin 4 of D22 via the diagnostic line.