WIRING DIAGRAM - ADDITIONAL HEATER - Fiat BRAVO 1.9 JTD 8v
COMPONENTS - ADDITIONAL HEATER - Fiat BRAVO 1.9 JTD 8v
| Component code | Description | Reference to the operation |
| B002 | JUNCTION UNIT UNDER DASHBOARD | |
| B098 | SUPPLEMENTARY FUSE BOX | - |
| B099 | MAXI FUSE BOX ON BATTERY | - |
| C016 | AIR CONDITIONING UNIT EARTH | - |
| C038 | EARTH ON CENTRE TUNNEL | - |
| D008 | AIR CONDITIONING-HEATER FRONT COUPLING | - |
| H001 | IGNITION SWITCH | |
| J036 | ADDITIONAL HEATER RELAY - 1 | - |
| J037 | ADDITIONAL HEATER RELAY -2 | - |
| M001 | BODY COMPUTER | |
| M070 | CLIMATE CONTROL SYSTEM CONTROL UNIT | |
| O025 | ADDITIONAL HEATER RESISTANCE | - |
COMPONENT LOCATION - ADDITIONAL HEATER - Fiat BRAVO 1.9 JTD 8v
| Component code | Description | Reference to the operation |
| B002 | JUNCTION UNIT UNDER DASHBOARD | |
| B098 | SUPPLEMENTARY FUSE BOX | - |
| B099 | MAXI FUSE BOX ON BATTERY | - |
| C016 | AIR CONDITIONING UNIT EARTH | - |
| C038 | EARTH ON CENTRE TUNNEL | - |
| D008 | AIR CONDITIONING-HEATER FRONT COUPLING | - |
| H001 | IGNITION SWITCH | |
| J036 | ADDITIONAL HEATER RELAY - 1 | - |
| J037 | ADDITIONAL HEATER RELAY -2 | - |
| M001 | BODY COMPUTER | |
| M070 | CLIMATE CONTROL SYSTEM CONTROL UNIT | |
| 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 the climate control system 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 unit 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)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.The coil for relay J36 is energized by a signal from pin 8 of the climate control system control unit M70.The coil for relay J37 is energized by a signal for the engagement of the first resistance for O25B - from pin 7 of the climate control system control unit M70.
