AUTOMOTIVE ELECTRICIANS PORTAL - FZCO

Alfa Romeo 156 2.4 JTD 20v fino a 03/98 – HEATER – – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION

Alfa Romeo 156 2.4 JTD 20v  fino a 03/98 – HEATER –  – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION
Wiring diagram

Components
Component codeNameAssembly reference
B6MAXI FUSE box - 2-
B6MAXI FUSE box-2-
B10Fuse controlled by ignition (INT/A)-
B10Key-dependent supply fuse (INT/A)-
B11Controls lighting fuse-
B98Supplementary fuse box5505A
B99Maxifuse box on battery-
B99Maxifuse box on battery5530B
C20Passenger side dashboard earth5505A
C30Left rear earth5505A
D1Front / dashboard connection-
D1Front / dashboard coupling-
D21Dashboard/air conditioning-heater connection-
D21Dashboard/air conditioning-heater coupling-
H1Ignition switch5520A
H80Climate control controls5020B
H80Climate control system controls5020B
H81Climate control fan control5020B
J35Interior compartment air electricfan relay-
N82Air intake actuator5020B
N85Passenger compartment ventilationfan5020A
N85Passenger compartment ventilationfan5040C
O30Air fan adjustment resistance5020A
O30Passenger compartment air fan adjustment resistor5020A
Location of components

Components
Component codeNameAssembly reference
B6MAXI FUSE box - 2-
B6MAXI FUSE box-2-
B10Fuse controlled by ignition (INT/A)-
B10Key-dependent supply fuse (INT/A)-
B11Controls lighting fuse-
B98Supplementary fuse box5505A
B99Maxifuse box on battery-
B99Maxifuse box on battery5530B
C20Passenger side dashboard earth5505A
C30Left rear earth5505A
D1Front / dashboard connection-
D1Front / dashboard coupling-
D21Dashboard/air conditioning-heater connection-
D21Dashboard/air conditioning-heater coupling-
H1Ignition switch5520A
H80Climate control controls5020B
H80Climate control system controls5020B
H81Climate control fan control5020B
J35Interior compartment air electricfan relay-
N82Air intake actuator5020B
N85Passenger compartment ventilationfan5020A
N85Passenger compartment ventilationfan5040C
O30Air fan adjustment resistance5020A
O30Passenger compartment air fan adjustment resistor5020A
DescriptionThe climate control system with heaterunit is controlled by means of three knobs in the control panelin the centre of the dashboard:the left knob mechanically controls the mixture flap betweenhot air (red) and cold air (blue);the right knob, mechanically operated via a cable, controlsthe opening of the flaps which regulate the distribution of airflows;the centre knob electrically controls the ventilationof the air at four different speeds: 1, 2, 3 and 4. In position0, the fan is turned off but air still enters due to the dynamiceffect of the car's motion.;when pressed, the left button activates the air recirculationfunction by an electrical command; when the button is pressed, therelevant LED comes on. If the button is released, "dynamic"air flows in from the outsidethe right button switches on the heated rear window; whenthe button is pressed, the relevant LED comes on. ( 3233996SeeE3030HEATED REAR WINDSCREENAND DOOR MIRROR DEFROSTING ). The control switches have ideograms whichare lit up when the side lights are on. For more details, 3232956see DESCRIPTION AND OPERATION:5020HEATERThe system is controlled by means of a specialrelay located in the distributor duct unit.The fan supply lines are protected by aspecial maxifuse and by the fuse which protects other supplies controlledby the ignition. The fan only operates when the ignition is switchedON.
Functional description The relay J35 controls the heater fan circuit. The supply at the relay contact comes fromthe battery through the line for the A/C maxifuse up to 2/99 orof B99 from 2/99, while the coil energizing is controlledby the ignition (INT/A) from the line protected by fuse B10 upto 2/99 or fuse F6 of the additional fuse box B98B from2/99. The relay J35 supplies the controlknob H81 : this controls the fan at the different speeds throughthe regulator O30 . The voltage control system varies accordingto the position of the knob and passes or does not pass throughthe resistors of the regulator O30 determining the four differentvoltage signals for the fan N85 which sends outside or recirculationair to the duct/distributor unit at 4 different speeds. The regulator O30 has a thermal contactwhich protects against dangerous overvoltages. The intake of outside air is controlledby the motor N82 which operates the flap between the twoextreme positions of "dynamic air" and "recirculation". The activation of the motor is controlledby the button located in the controls H80 : this switch receivesa supply controlled by the ignition (INT/A) from the line protectedby the fuse B10 up to 2/99 or fuse F6 of the additionalfuse box B98B from 2/99. and is connected to earth: when the supplyand earth are reversed, the motor's direction of rotation is reversed.With the recirculation switched on, the LED in the button for H80 alsocomes on. The controls unit H80 has ideogramswhich are lit up when the side lights are on by means of the linecoming from the steering column switch unit H5 protectedby fuse B11 up to 2/99 or fuse F4 of the additionalfuse box B98B from 2/99.

MAXI FUSE box - 2



B6A



B6A



B6A



B6B



Fuse controlled by ignition (INT/A)



B10



Controls lighting fuse



B11



B11



Supplementary fuse box



B98A



B98A



B98A



B98A



B98A



B98A



B98A



B98A



B98A



B98A



B98A



B98A



B98A



B98A



B98A



B98A



B98A



B98A



B98A



B98A



B98A



B98A



B98B



B98B



B98B



B98B



B98B



B98C



B98C



B98C



multi-function components



5505A10


769

5505A16


769

5505A18


<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting213238830-7040G24switch for facia compartmentlight - r+r3238829-7040G20facia compartment light bulb holder - r+r3238795-7040A31flap assembly - r r1. Undo the bolts.2. Move the integrated service control unit slightly.3. Disconnect the electrical connections (3a, 3b, 3c).2018617

5505A30


<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting21Remove components obstractingaccess to earth carrier node.1. Unscrew screw.2. Disjoin earth carrier node.2018618

5505A38



Maxifuse box on battery



B99A



B99A



B99A



B99A



B99B



B99B



B99B



B99B



B99B



B99B



B99C



B99C



B99C



B99C



B99C



B99C



B99C



B99C



B99D



B99D



B99D



B99D



B99D



B99D



B99D



battery and leads



5530B10


<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting21Place the car on a ramp.Undo the bolt securing the bracket on thebattery mount.Release the battery from the anchoragebracket complete with strap and remove.

5530B14


769768768

5530B18


Follow these precautions.769On batteries with an opticam hydrometer,electrolyte level and battery charge status can be monitored qualitativelyby examining the indicator colour:a light, bright colour indicates low electrolytelevel: top up with distilled water;a dark colour without a green area in thecentre indicates that the electrolyte level is correct but chargeis low: recharge the battery;a dark colour with a green area in themiddle indicates that both electrolyte level and charge status arecorrect: no action is necessary. For more details 3238420See subassembly5530 CURRENT GENERATOR . 768Proceed as follows.Check the battery voltage without loadusing the test device recommended by the Service outlets (e.g. 'MICRO360').Depending on the voltage values measured,which define the state of charge of the battery, proceed as follows: If the voltage without load is less than12.10 V, replace the battery ( 32384295530B10battery - r+r ). If the voltage without load is over 12.10V but less than 12.50 V, recharge the battery ( 32384305530B14battery - recharge ). If the voltage without load is over 12.50V, the battery is efficient.If necessary, top up the electrolyte asfollows.Carefully remove the cap strip.Top up with distilled and deionized water,taking care not to allow electrolyte to splash out.768

5530B22


<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting21Place the car on the liftingbridge.1. Open engine compartment cap and disconnect battery negative terminal.2. Disconnect mass terminal on side member.3. Lift the car and disconnect mass terminal on gearbox.4. Lower the car again and remove battery earth lead.2018767

5030B26



5030B40


<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting21Disconnect the battery negative terminal.1. Open the protective cover2. Loosen the nut and disconnect the ABS supply lead3. Loosen the nut and disconnect the starter motor supply lead4. Undo the clip and undo the box retaining bolts.5. Loosen the battery positive terminal nut.2018769

5530B52


<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting213238429-5530B10battery - r+rRelease the air duct hose from the mountingbracket on the drip tray. Remove the relay shield.1. Release the relays from the battery drip tray and remove them.2. Undo the nut fixing the air filter mounting bracket to the batterydrip tray.3. Undo the two fixing nuts (3a) and move the connections/electricalwiring mounting bracket (3b) aside.4. Release the accelerator cable from the fastening on the bracket.2018771

Passenger side dashboard earth



C20A



C20A



C20B



C20B



C20B



C20B



Left rear earth



C30



C30



C30



C30



Front / dashboard connection



D1B



D1B



D1



D1



D1



D1



D1



D1



D1



D1



D1



D1



D1



D1



D1



D1



D1



D1



D1



D1



D1



D1



D1



D1



D1



D1



D1



D1



D1



D1



D1



D1



D1



D1



D1



D1



D1



D1



D1



D1



D1



D1



D1



Dashboard/air conditioning-heater connection



D21A



D21A



D21A



D21A



D21A



D21A



D21A



D21A



D21A



D21A



D21A



D21A



D21B



D21B



D21B



D21B



D21B



D21B



D21B



D21B



Ignition switch



H1A



H1A



H1A



H1A



H1A



H1A



H1A



H1A



H1A



H1A



H1A



H1A



H1A



H1A



H1A



H1A



H1A



H1A



H1A



H1A



H1B



H1B



H1B



H1B



H1B



H1B



ignition switch



5520A12


<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting213238121-4110A11steering wheel - r+rfor replacement or check for versions with air bag3238793-7040A26steering column trim - r+r3238476-5550A12complete stalk unit - r+r for versions with air bag1. Disconnect electric connection from ignition switch.2. Unscrew screws (2a) and remove starter switch (2b). 2018661

5520A14


769

5520A16


769

5520A18


<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting21Unloose fixing screws and removesteering column guide.1. Detach down-lead cable.2018668

Climate control controls



H80



heater controls



5020B10


<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting213238803-7040A65passenger compartmentbox lock , one , r r (right and leftsite) 3238343-5040D22control (one) of air conditioner control support- arrange3238986-7065C42ashtray (one) r+r3238514-5570T80car radio unit - r+r3237934-2125C24gear lever knob - r + r3238802-7040A60under facia trim - r+r3238117-3380A44handbrake/linkage protection - r+r3238851-7040L28tunnel switch panel - r r3238849-7040L20tunnel trim - r r1. Loosen the screws2. Remove the flask3. Loosen the screws4. Remove the command support5. Disconnect the electric connections (5a, 5b).6. Disconnect the cables (6a) of door activator from the checks(6b).2018360

5020B14


<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting211. Disconnect the electric connections (1a, 1b).2. Disconnect the activator door cables (2a) from the checks(2b).3. Recover the command support2018361

5020B22



5020B28



5020B31


<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting213238803-7040A65passenger compartmentbox lock , one , r r (right and leftsite) 3238343-5040D22control (one) of air conditioner control support- arrange3238986-7065C42ashtray (one) r+r3238514-5570T80car radio unit - r+r3237934-2125C24gear lever knob - r + r3238802-7040A60under facia trim - r+r3238117-3380A44handbrake/linkage protection - r+r3238851-7040L28tunnel switch panel - r r3238849-7040L20tunnel trim - r r3238286-5020B10heater control support - r+r3238830-7040G24switch for facia compartment light - r+r3238829-7040G20facia compartment light bulb holder - r+r3238795-7040A31flap assembly - r r3238790-7040A14flap of glove compartment trim element (one) - arrange3238788-7040A09passenger air bag compartment cover - r r3238528-5580C22AIR BAG MODULE - Passenger side - R.R.7683238501-5560C51combined analogue control panel - r+r or replace1. Disconnect the electric connections (1a, 1b, 1c) of the centralintegrated services2. Loosen the screws of the flask central-tray and rele3. Remove the flask central-tray and rele2018363

5020B42


<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting213238803-7040A65passenger compartmentbox lock , one , r r (right and left) 3238343-5040D22control (one) of air conditioner control support- arrange3238986-7065C42ashtray (one) r+r3238514-5570T80car radio unit - r+r3237934-2125C24gear lever knob - r + r3238802-7040A60under facia trim - r+r3238117-3380A44handbrake/linkage protection - r+r3238851-7040L28tunnel switch panel - r r3238849-7040L20tunnel trim - r r3238286-5020B10heater control support - r+r3238830-7040G24switch for facia compartment light - r+r3238829-7040G20facia compartment light bulb holder - r+r3238795-7040A31flap assembly - r r3238790-7040A14flap of glove compartment trim element (one) - arrange3238788-7040A09passenger air bag compartment cover - r r3238528-5580C22AIR BAG MODULE - Passenger side - R.R.7683238501-5560C51combined analogue control panel - r+r or replace1. Disconnect the electric connections (1a, 1b, 1c) of the centralintegrated services2. Loosen the screws of the centraltray and rele flask3. Remove the central-tray and rele flask2018365

5020B60



5020B61



5020B80


769

Climate control fan control



H81



Interior compartment air electric fan relay



J35



Air intake actuator



N82



N82



N82



N82



Passenger compartment ventilation fan



N85



N85



N85



N85



box and components



5020A10


<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting213238254-5010C12Windscreen demisingVENT - R.R.3238799-7040A37fuse box cover - r r3238800-7040A44facia lh side cover - r r3238830-7040G24switch for facia compartment light - r+r3238829-7040G20facia compartment light bulb holder - r+r3238795-7040A31flap assembly - r r3238803-7040A65passenger compartment box lock , one , r r (rightand left) 3238343-5040D22control (one) of air conditioner control support- arrange3238986-7065C42ashtray (one) r+r3238514-5570T80car radio unit - r+r3237934-2125C24gear lever knob - r + r3238802-7040A60under facia trim - r+r3238117-3380A44handbrake/linkage protection - r+r3238851-7040L28tunnel switch panel - r r3238849-7040L20tunnel trim - r r3238501-5560C51combined analogue control panel - r+r or replace3238460-5540C18headlamp/light cluster alignment correction motorswitch - r+r3238502-5560C60anomaly display - r+r3238496-5560B02kilometre/mileometer - r r3238497-5560B03rev counter - r r3238527-5580C18air bag module - r+r7683238121-4110A11steering wheel - r+r for replacement or check forversions with air bag3238793-7040A26steering column trim - r+r3238525-5580C12clock spring for air bag module on steering wheelr r3238476-5550A12complete stalk unit - r+r for versions with air bag3238528-5580C22AIR BAG MODULE - Passenger side - R.R.3238838-7040H30front pillar trim - r r (rightand left) 3238789-7040A10instrument facia trim - r+r3238244-5010A12engine/heater line - r r3238245-5010A16heater/engine line - r r

5020A11



5020A12


<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting213238244-5010A12engine/heater line -r r3238245-5010A16heater/engine line - r r

5020A24


<anchor>0</anchor><span>Dismantling</span><icon><imageid>20</imageid></icon>1Reassembling211. Unscrew the wiring retaining clips.2. Disconnect the recirculation actuator electrical connection.3. Disconnect the electrical connection for the fan.4. Disconnect the electrical connections from the fan resistor.5. Release the relay carrier from the bracket.6. Remove the wiring harness with relays.2018346

5020A28


<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting211. Loosen the screw2. Turn the support in the anticlockwise direction and extract it3. Disconnect the electric connection4. If necessary, press the vibration-damping rubbers (4a) and separatethe electroventilator (4b) from the support (4c).2018355

5020A30


<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting211. Working under the scaffold loosen the screws2. Turn the support in the anticlockwise direction and remove ita little3. Disconnect the electric connection4. If necessary press the vibration-dumping rubbers (4a) and separatethe electroventilator (4b) from the support (4c).2018356

5020A44


<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting211. Workin under the scaffold, disconnect the electric connectionof the resistor2. Loosen the screws3. Remove the resistor.2018357

5020A50


<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting213238244-5010A12engine/heater line -r r3238245-5010A16heater/engine line - r r3238803-7040A65passenger compartment box lock , one , r r (rightand left site). - 5010B44 rear seat air duct - arrange (rightand left site). 3238526-5580C14air bag ecu - r+r7681. Disconnect the coupling2018358

5020A54



air conditioner box and components



5040C10


3238830-7040G24switch for facia compartment light - r+r3238829-7040G20facia compartment light bulb holder - r+r3238795-7040A31flap assembly - r r3238803-7040A65passenger compartment box lock , one , r r (rightand left) 3238343-5040D22control (one) of air conditioner control support- arrange3238986-7065C42ashtray (one) r+r- 5570T50 car telephone unit support - r+r 3237934-2125C24gear lever knob - r + r3238802-7040A60under facia trim - r+r3238117-3380A44handbrake/linkage protection - r+r3238851-7040L28tunnel switch panel - r r3238849-7040L20tunnel trim - r r3238501-5560C51combined analogue control panel - r+r or replace3238460-5540C18headlamp/light cluster alignment correction motorswitch - r+r3238502-5560C60anomaly display - r+r3238496-5560B02kilometre/mileometer - r r3238497-5560B03rev counter - r r3238527-5580C18air bag module - r+r7683238121-4110A11steering wheel - r+r for replacement or check forversions with air bag3238793-7040A26steering column trim - r+r3238525-5580C12clock spring for air bag module on steering wheelr r3238476-5550A12complete stalk unit - r+r for versions with air bag3238528-5580C22AIR BAG MODULE - Passenger side - R.R.3238838-7040H30front pillar trim - r r (rightand left) 3238789-7040A10instrument facia trim - r+r Drain the coolant 3238305-5040A10Air conditioning refrigerantCIRCUIT - Draining and Refilling3238244-5010A12engine/heater line - r r3238245-5010A16heater/engine line - r r

5040C11



5040C12


768

5040C15



5040C24


<anchor>0</anchor><span>Dismantling</span><icon><imageid>20</imageid></icon>1Reassembling211. Disconnect the electrical connection for the frost sensor.2018499

5040C30


<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting211. Working under the dashboard, undo the bolt.2. Rotate the support in an anti-clockwise direction and gentlyextract it.3. Disconnect the electrical connections.4. If necessary, press the anti-vibration rubber mountings (4a)and separate the fan (4b) from the support (4c).2018524

5040C34


<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting211. Unscrew the bolt.2. Rotate the support in an anti-clockwise direction and gentlyextract it.3. Disconnect the electrical connections.4. If necessary, press the anti-vibration rubber mountings (4a)and separate the fan (4b) from the support (4c).2018527

5040C44


<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting211. Working underneath the dashboard, disconnect the electrical connections(1a, 1b) for the electronic variator.2. Unscrew the bolts3. Remove the electronic variator2018529

5040C50


<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting213238244-5010A12engine/heater line - r r3238245-5010A16heater/engine line - r r3238803-7040A65passenger compartment box lock , one , r r (leftand right sides) - 5010B44 rear seat air duct - arrange (leftand right sides). 3238526-5580C14air bag ecu - r+r7681. Disconnect the sleeve.2. Turn the mixed air temperature sensor and remove.2018532

5040C52


<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting211. Unscrew the screws.2. Remove the conveyor.3. Unscrew the radiator support.4. Lower the support with radiator.5. Unscrew.6. Remove the sleeper.7. Remove radiator and support.8. Unscrew.9. Remove the stop.10. Remove the radiator from its support.2018536

5040C66


<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting211. Undo the bolts fixing the shield for the expansion valve.2. Remove the shield.2018537

5040C80


<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting211. Disconnect the electrical connection for the air recirculationand intake motor.2. Unscrew the bolt.3. Rotate the air recirculation and intake assembly and remove it.2018543

Air fan adjustment resistance



O30