Fiat BRAVO 1.9 JTD 8v – ADDITIONAL HEATER – – Manual Air Conditioning – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION

WIRING DIAGRAM - ADDITIONAL HEATER - Fiat BRAVO 1.9 JTD 8v

ADDITIONAL HEATER - WIRING DIAGRAM Fiat BRAVO 1.9 JTD 8v

Get access to all wiring diagrams of the car

COMPONENTS - ADDITIONAL HEATER - Fiat BRAVO 1.9 JTD 8v

Component code	Description	Reference to the operation
B001	JUNCTION UNIT
B002	JUNCTION UNIT UNDER DASHBOARD
B098	SUPPLEMENTARY FUSE BOX	-
B099	MAXI FUSE BOX ON BATTERY	-
C010	LEFT FRONT EARTH	-
C016	AIR CONDITIONING UNIT EARTH	-
C038	EARTH ON CENTRE TUNNEL	-
D008	AIR CONDITIONING-HEATER FRONT COUPLING	-
H001	IGNITION SWITCH
I095	ADDITIONAL HEATER SAFETY SWITCH	-
J036	ADDITIONAL HEATER RELAY - 1	-
J037	ADDITIONAL HEATER RELAY -2	-
M001	BODY COMPUTER
M075	ADDITIONAL HEATER CONTROL UNIT	.
N085	PASSENGER COMPARTMENT AIR FAN
O025	ADDITIONAL HEATER RESISTANCE	-

COMPONENT LOCATION - ADDITIONAL HEATER - Fiat BRAVO 1.9 JTD 8v

ADDITIONAL HEATER - COMPONENT LOCATION Fiat BRAVO 1.9 JTD 8v

Get access to all wiring diagrams of the car

Component code	Description	Reference to the operation
B001	JUNCTION UNIT
B002	JUNCTION UNIT UNDER DASHBOARD
B098	SUPPLEMENTARY FUSE BOX	-
B099	MAXI FUSE BOX ON BATTERY	-
C010	LEFT FRONT EARTH	-
C016	AIR CONDITIONING UNIT EARTH	-
C038	EARTH ON CENTRE TUNNEL	-
D008	AIR CONDITIONING-HEATER FRONT COUPLING	-
H001	IGNITION SWITCH
I095	ADDITIONAL HEATER SAFETY SWITCH	-
J036	ADDITIONAL HEATER RELAY - 1	-
J037	ADDITIONAL HEATER RELAY -2	-
M001	BODY COMPUTER
M075	ADDITIONAL HEATER CONTROL UNIT	.
N085	PASSENGER COMPARTMENT AIR FAN
O025	ADDITIONAL HEATER RESISTANCE	-

DESCRIPTION - ADDITIONAL HEATER - Fiat BRAVO 1.9 JTD 8v

Vehicle climate control via the heater unit is insufficient when the engine is cold.On these versions there is also an additional heating system which is activated when the engine is first running, depending on the temperature of the engine coolant.The system consists of an additional heating device, located inside the heater unit: this device contains two resistances (PTC1 - 250 W and PTC2 - 500 W).The operation of the resistances is controlled by a dedicated control unit which operates either just one of them or both thereby providing gradual heating with a maximum power of 750 W according to a control logic that depends on:- the outside temperature (below 20°C)- the temperature of the engine coolant (about 70°C);- the engine speed (which should be above a 700 rpm);- the battery voltage (which should not go down below 12.6 V).For more detailsThe power supply for one, two or three resistances is operated by means of two relays located on the actual heater unit:- 1. Level: activated by the first relay (250W);- 2. Level: activated by the second relay (500W);- 3. Level: activated by both relays (750W)This power supply is interrupted in the casing of overheating by a dedicated safety switch.The power supply line is protected by two MIDI maxi fuses located in a special additional fuse box at the side of the battery.

FUNCTIONAL DESCRIPTION - ADDITIONAL HEATER - Fiat BRAVO 1.9 JTD 8v

The relay J36 controls the engagement circuit for the first additional heater coil O25A; the power supply for the relay arrives from the line for fuse F74 of the additional fuse box B98.The relay J37 controls the engagement circuit for the other additional heater coil O25B; the power supply for the relay arrives from the line for fuse F76 of the additional fuse box B98.The coils for relays J36 and J37 receive an ignition-controlled supply (INT) from the line for fuse F51 of the junction unit under the dashboard B2. This power supply is interrupted in the casing of overheating by safety switch I95.The coil for relay J36 is energized by a signal for the engagement of the first resistance for O25A - from pin 5 of supplementary heater control unit M75.The coil for relay J37 is energized by a signal for the engagement of the first resistance for O25B - from pin 8 of supplementary heater control unit M75.The control unit M75 receives a power supply, at pin 4, from the ignition-controlled line (INT) for fuse F51 of the junction unit under the dashboard B2. This power supply is interrupted in the casing of overheating by safety switch I95.Pin 2 of M75 is earthed.Supplementary heater control unit M75 is connected – from pins 3 and 6 - via the CAN line, to Body Computer M1 and to the other network nodes.The Body Computer M1 receives a direct supply from the battery via the line protected by maxifuse B99 at pin 18 of connector F of the interface with the junction unit under the dashboard B2; the ignition-controlled supply (INT) reaches pin 9 of connector F of the interface with the junction unit B2.When the heater is on, fan N85 is controlled from pin 9 of M75.Fan N85 is supplied from a line protected by fuse F8 and relay T8 of engine compartment junction unit B1: it is an ignition-controlled line (INT/A) for fuse F31 of the junction unit under the dashboard B2.