Fiat DOBLO 1.9 JTD 8V Fino a 10/2000 – HEATED REAR WINDSCREEN AND DOOR MIRROR DEFROSTING – – MY 2005 – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION

DEMISTING REARSCREEN AND REAR VIEW MIRRORS - WIRING DIAGRAM Fiat DOBLO 1.9 JTD 8V Fino a 10/2000

Components - HEATED REAR WINDSCREEN AND DOOR MIRROR DEFROSTING - Fiat DOBLO 1.9 JTD 8V Fino a 10/2000

Component code	Description	Reference to the assembly
B001	JUNCTION UNIT
B2	JUNCTION UNIT UNDER DASHBOARD
C15	DASHBOARD EARTH, DRIVER''S SIDE
C030	LEFT REAR EARTH
D004	FRONT/ENGINE COUPLING
D30	REAR/DRIVER''S FRONT DOOR COUPLING
D31	REAR/PASSENGER FRONT DOOR COUPLING
D085	TAILGATE/REAR SEAL
E50	INSTRUMENT PANEL
H001	IGNITION SWITCH
H90	SWITCH CONTROL UNIT
K84	SPEEDOMETER SENSOR
M001	BODY COMPUTER
P53	RIGHT HEATED REAR WINDSCREEN
P54	LEFT HEATED REAR WINDSCREEN
P60	LEFT DOOR MIRROR
P61	RIGHT DOOR MIRROR

DEMISTING REARSCREEN AND REAR VIEW MIRRORS - COMPONENT LOCATION Fiat DOBLO 1.9 JTD 8V Fino a 10/2000

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Component code	Description	Reference to the assembly
B001	JUNCTION UNIT
B2	JUNCTION UNIT UNDER DASHBOARD
C15	DASHBOARD EARTH, DRIVER''S SIDE
C030	LEFT REAR EARTH
D004	FRONT/ENGINE COUPLING
D30	REAR/DRIVER''S FRONT DOOR COUPLING
D31	REAR/PASSENGER FRONT DOOR COUPLING
D085	TAILGATE/REAR SEAL
E50	INSTRUMENT PANEL
H001	IGNITION SWITCH
H90	SWITCH CONTROL UNIT
K84	SPEEDOMETER SENSOR
M001	BODY COMPUTER
P53	RIGHT HEATED REAR WINDSCREEN
P54	LEFT HEATED REAR WINDSCREEN
P60	LEFT DOOR MIRROR
P61	RIGHT DOOR MIRROR

The heated rear windscreen and door mirror defrosing resistances coils are activated by a specific button in the switch unit in the middle of the dashboard.The defrosting circuit is protected by a specific fuse and controlled by a relay in the junction unit under the dashboard.The control is then deactivated in two ways:- MANUALLY: pressing the same button again;- AUTOMATICALLY: after 20 minutes effective operation, i.e. with the control activated.The automatic operation of the rearscreen is linked to the engine speed.The on/off logic is as follows:- the first ten minutes of operation are independent of the operation of the engine;- the following minutes, on the other hand, depend on the operation of the engine, namely: if the number of revs is less than 1000 rpm for a period of ten seconds the heated rear windscreen is switched off, otherwise if the engine speed is more than 1000 rpm, it remains on until it has been on for twenty minutes.If the battery voltage goes below 8.5 V, the heated rear windscreen control relay switches the circuit off.

The heated rear windscreen and door mirror defrosting activation signal consists of an earth signal coming from switch unit H90 entering pin 32 of connector F of the body computer M01.The ideogram for switch H90 is lit up by an ignition operated power supply (INT) at pin 6 by means of a line protected by fuse F49 of the junction unit under the dashboard B02.In order to activate the defrosting of the rearscreen and the door mirrors the body computer M01 receives a signal, not only from switch H90, but also from the speedometer sensor K84 via pin 17 connector C. If necessary, it then energizes relay R11 located in the junction unit under the dashboard B02.Once energized, relay R11 supplies: the left heated rear windscreen P54 and the right heated rear windscreen P53 via fuse F40, the left P60 and Right P61 mirrors via fuse F41.Once the function is activated, the body computer M01 lights up the warning light in the instrument panel E50 from pins 6 and 5 connector D of the actual body computer.The body computer may be supplied via pin 11 connector E (ignition-controlled supply) and pin A connector C (direct supply) of the junction unit B02.There is a proective fuse F1 for the direct power supply located in the junction unit B01.These lines also supply the instrument panel E50 via two lines protected by fuses F37 (pin 1 connector A) and F53 (pin 3 connector A; for the Natural Power version, pin 2 connector A).Pins 8 and 9 of connector D of the body computer are earthed.