AUTOMOTIVE ELECTRICIANS
WIRING-DIAGRAMS

Alfa Romeo 166 2.0 TB fino a 2/99 – ABS – – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION

    HomeWiring Diagrams alfaAlfa Romeo 166Alfa Romeo 166 EnglishAlfa Romeo 166 2.0 TB fino a 2/99 All WIRING DIAGRAMS (English)
Download PDF file
Get access to all wiring diagrams of the carDownload PDF file
Wiring diagram
ABS - Wiring diagram Alfa Romeo 166 2.0 TB fino a 2/99Get access to all wiring diagrams of the carDownload PDF file

Components
Component codeNameAssembly reference
A5Terminal board-
B1Junction unit-
B1Junction unit5505A
B1Junction unit5505A
B2Dashboard junction unit (CPL)-
B2Junction unit-
B2Junction unit5505A
B7-MAXI FUSE) for ABS-
B31ABS fuse-
B99Battery fuses junction unit (CBA)5530B
C10Front left earth-
C12ABS front earth-
C21Dashboard earth on Air Bag bracket-
C21Passenger side dashboard earth-
D1Dashboard-i.e coupling.-
D1Front-dashboard coupling-
D5ABS plus ANTISPIN coupling-
D5ABS plus antispin connection-
D6Rear - front coupling-
D19Dashboard / battery coupling-
E50Instrument panel-
E50Instrument panel5560B
H1Ignition switch5520A
I30Brake pedal switch5550D
K70Left. front wheel sensor for ABS3340A
K71Right. front wheel sensor for ABS3340A
K75Left rear wheel sensor for ABS.3340A
K76Rear right wheel sensor for ABS3340A
M10Engine management control unit-
M50ABS control unit3340A
R10Multiple tester connection-
Location of components
ABS - Location of components Alfa Romeo 166 2.0 TB fino a 2/99Get access to all wiring diagrams of the carDownload PDF file

Components
Component codeNameAssembly reference
A5Terminal board-
B1Junction unit-
B1Junction unit5505A
B1Junction unit5505A
B2Dashboard junction unit (CPL)-
B2Junction unit-
B2Junction unit5505A
B7-MAXI FUSE) for ABS-
B31ABS fuse-
B99Battery fuses junction unit (CBA)5530B
C10Front left earth-
C12ABS front earth-
C21Dashboard earth on Air Bag bracket-
C21Passenger side dashboard earth-
D1Dashboard-i.e coupling.-
D1Front-dashboard coupling-
D5ABS plus ANTISPIN coupling-
D5ABS plus antispin connection-
D6Rear - front coupling-
D19Dashboard / battery coupling-
E50Instrument panel-
E50Instrument panel5560B
H1Ignition switch5520A
I30Brake pedal switch5550D
K70Left. front wheel sensor for ABS3340A
K71Right. front wheel sensor for ABS3340A
K75Left rear wheel sensor for ABS.3340A
K76Rear right wheel sensor for ABS3340A
M10Engine management control unit-
M50ABS control unit3340A
R10Multiple tester connection-
DescriptionThe electronic anti-lock brake system (BOSCH 5.3 ABS) governs braking pressure sent to the wheels and prevents loss of grip under all tyre and road surface conditions. The system is designed to complement the normal mechanical braking system and not to replace it. In this way it ensures effective safety in the case of anomalies: the ABS uses the same fluid as the conventional mechanical braking system.Four sensors fitted to the four wheels inform the electronic control unit of wheel speed at every moment. In this way, they detect wheel lock, wheel slip and loss of grip. Under these conditions, the control unit sends specific instructions to solenoids that modulate hydraulic circuit pressure to eliminate lock and restore the car to within grip limits. This ensures the shortest possible stopping distance, without losing control of the steering.Two adjustment solenoids (one for pressure charging, the other for pressure discharging) are fitted for each wheel.The sensors are active, i.e. they consist of a Hall-effect receiver that faces a magnetic coding device built into the hub bearing. Under these conditions, the signal is less influenced by electromagnetic interference and temperature.The control unit also controls brake force distribution over the rear axle and thus replaces the mechanical load proportioning valve used previously (EBD function: Electronic Brake Distribution).The control unit is equipped with a self-diagnostic function: when an error occurs in the ABS system, a warning light is turned on and the system is simultaneously deactivated. Under these conditions, the car brakes using only the conventional system.When the control unit detects an error in the EBD function, it simultaneously turns on the 'insufficient brake fluid level' and 'handbrake on' warning light as well as the ABS warning light.Under these conditions, the rear brake distribution control is also deactivated and the car must be driven with great care. For more details 3308517see DESCRIPTION AND OPERATION:3340A(B.S. ANTI-LOCK BRAKING SYSTEM .)Supply lines to the control unit and the various system components (sensors and actuators) are protected by a maxifuse and a jumper fuse located in the engine bay.
Functional description ABS electronic control unit M50 is supplied (at pin 17 and 18) directly by the battery via a line protected by ABS maxifuse B7 . Ignition-operated power supply (INT/A) reaches pin 15 of the line protected by shunt fuse B31 . The control unit is earthed via pins 19 and 16. The four sensors K70, K71, K75, K76 send wheel speed signals to pins 6-7, 4-5, 8-9 and 1-2 of M50 respectively. Brake pedal switch I30 sends an enablement signal to pin 14 of control unit M50 : the ABS cannot intervene unless the brake pedal is pressed. Pin 22 of M50 produces a speedometer signal (average speed of all four wheels) which is directed to instrument panel E50 - pin 2 of connector B ( 3309717SeeE4010INSTRUMENT PANEL ). The ABS includes a self-diagnostic system: when the control unit detects problems with the ABS, it sends a signal from pin 20 of instrument E50 - pin 8 of connector C - which turns on the ABS fault warning light. This warning light is of the type known as 'smart' warning lights, because an inner control circuit causes the warning light to light up even if the connection is broken or if the circuit connecting warning light and control unit is short-circuited to earth. If the problems lie in the EBD function, the control unti also sends a signal from pin 21 to instrument E50 - pin 19 of connector C - to the low brake fluid and handbrake warning light. Both signals sent to the instrument are earth, and they turn on the warning lights since instrument E50 is ignition-activated (INT/A) from a line protected by fuse F1 of junction unit B1 . The self-test data can be read by connecting to connector R10 : it receives signals from pin 11 of the control unit M50 via the special diagnostic line.

Terminal board



A5



A5



A5



A5



A5



A5



A5A



A5A



A5B



A5B



A5C



A5D



A5



A5



A5



A5



A5



A5



A5



A5



A5A



A5A



A5B



A5B



A5C



A5D



A5



A5



Junction unit



B1A



B1A



B1A



B1A



B1A



B1A



B1A



B1A



B1A



B1A



B1A



B1B



B1B



B1B



B1B



B1B



B1B



B1B



B1B



B1B



B1C



B1C



B1C



B1C



B1C



B1C



B1C



B1C



B1C



B1C



B1C



B1D



B1D



B1D



B1G



B1E



B1E



B1E



B1E



B1E



B1E



B1E



B1E



B1F



B1F



B1F



B1F



B1F



B1F



B1F



B1F



B1F



B1F



B1F



B1H



B1H



B1H



B1H



B1H



B1I



B1I



B1I



B1I



B1I



B1I



B1I



B1I



B1I



B1I



B1I



B1X



B1A



B1A



B1A



B1A



B1A



B1A



B1A



B1A



B1A



B1A



B1A



B1B



B1B



B1B



B1B



B1B



B1B



B1B



B1B



B1B



B1C



B1C



B1C



B1C



B1C



B1C



B1C



B1C



B1C



B1C



B1C



B1D



B1D



B1D



B1G



B1E



B1E



B1E



B1E



B1E



B1E



B1E



B1E



B1F



B1F



B1F



B1F



B1F



B1F



B1F



B1F



B1F



B1F



B1F



B1H



B1H



B1H



B1H



B1H



B1I



B1I



B1I



B1I



B1I



B1I



B1I



B1I



B1I



B1I



B1I



B1X



multi-function components



5505A10


<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting213314824-5505A18multi-function controlunit - r r . 1. Undo the bolt (1a) and push back the junction unit as far asnecessary to disconnect the electrical connections (1b).767For precise identification ofthe electrical connections, see Wiring Diagrams Section.2. Remove the junction unit.2010592

5505A13


<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting21 Make sure that the ignitionis off (STOP position), then disconnect the negative battery terminal(refer to op. 33148615530B10battery - r+r ). 3315196-7040D12engine front side cover (one) lh or rh - r r (left). 3315197-7040D14engine bay rear side cover (one) lh or rh - r r (left).

5505A18


<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting21 Make sure that the ignitionis off (STOP position), then disconnect the negative battery terminal(refer to op. 33148615530B10battery - r+r ). 1. Unscrew bolt (1a) and open fuse access cover (1b).2. Undo the bolt (2a) and remove the integrated multiservices unit(2b) after having disconnected the electrical connections (2c),(2d), (2e), (2f) and (2g).2010595

5505A29


<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting21Open the bonnet lid.1. Release the retainers (1a) and remove the cover (1b) for theadditional junction unit.2071293

Dashboard junction unit (CPL)



B2



B2A



B2B



B2C



B2E



B2F



B2G



B2G



B2H



B2I



B2I



B2I



B2I



B2I



B2I



B2



B2A



B2B



B2C



B2E



B2F



B2G



B2G



B2H



B2I



B2I



B2I



B2I



B2I



B2I



-MAXI FUSE) for ABS



B7



B7



B7



B7



B7



B7



ABS fuse



B31



B31



B31



B31



Battery fuses junction unit (CBA)



B99A



B99C



B99D



B99E



B99G



B99A



B99C



B99D



B99E



B99G



battery and leads



5530B10


<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting213314864-5530B54battery cover - r+r . Make sure that the ignition key is in theOFF position.1. Disconnect the battery negative and positive terminals.2. Undo the bolt (2a) fixing the battery retaining bracket (2b).3. Remove the battery.2010647

5530B40


<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting213314864-5530B54battery cover - r+r1. Press and release the retainers (1a), then remove the cover (1b)for the supply box on the battery. 2071303

5530B52


<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting213314864-5530B54battery cover - r+r . 3314861-5530B10battery - r+r . 1. Remove the battery fluid collection reservoir.2010648

5530B54


<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting211. Working in the luggage compartment, undo the knob for the batterycover.2. Remove the battery cover.2010650

Front left earth



C10A



C10A



C10A



C10A



C10A



C10A



C10A



C10A



C10A



C10B



C10A



C10A



C10A



C10A



C10A



C10A



C10A



C10A



C10A



C10B



Dashboard earth on Air Bag bracket



C21



C21



C21



C21



C21



C21



C21



C21



Dashboard-i.e coupling.



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



D1A



D1A



D1A



D1A



D1A



D1A



D1A



D1A



D1A



D1A



D1A



D1A



D1A



D1A



D1A



D1A



D1A



D1A



D1A



D1A



D1A



D1A



D1A



D1A



D1A



D1A



D1A



D1B



D1B



D1B



D1B



D1B



D1B



D1B



D1B



D1B



D1C



D1C



D1C



D1C



D1C



D1C



D1C



D1C



D1C



D1C



D1C



D1C



D1C



D1C



D1D



D1D



D1D



D1D



D1D



D1D



D1D



D1D



D1D



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



D1A



D1A



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D1A



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D1A



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D1A



D1A



D1A



D1A



D1A



D1A



D1A



D1A



D1A



D1A



D1A



D1A



D1A



D1A



D1A



D1A



D1A



D1A



D1B



D1B



D1B



D1B



D1B



D1B



D1B



D1B



D1B



D1C



D1C



D1C



D1C



D1C



D1C



D1C



D1C



D1C



D1C



D1C



D1C



D1C



D1C



D1D



D1D



D1D



D1D



D1D



D1D



D1D



D1D



D1D



ABS plus ANTISPIN coupling



D5



D5



D5



D5



D5



D5



D5



D5



D5



D5



D5



D5



Rear - front coupling



D6C



D6C



D6C



D6C



D6



D6



D6



D6



D6



D6



D6



D6



D6



D6



D6



D6



D6



D6



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D6



D6B



D6B



D6C



D6C



D6C



D6C



D6



D6



D6



D6



D6



D6



D6



D6



D6



D6



D6



D6



D6



D6



D6



D6



D6B



D6B



Dashboard / battery coupling



D19



D19



D19



D19



Instrument panel



E50A



E50A



E50A



E50A



E50A



E50A



E50A



E50A



E50A



E50A



E50A



E50A



E50B



E50B



E50B



E50B



E50B



E50B



E50C



E50C



E50C



E50C



E50C



E50C



E50C



E50C



E50C



E50C



E50D



E50D



E50A



E50A



E50A



E50A



E50A



E50A



E50A



E50A



E50A



E50A



E50A



E50A



E50B



E50B



E50B



E50B



E50B



E50B



E50C



E50C



E50C



E50C



E50C



E50C



E50C



E50C



E50C



E50C



E50D



E50D



analogue control panel



5560B06


<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting213314917-5560B11analogue control panel- r+r or replace . 1. At the bench, remove the bulbs from the panel using suitablepliers.2010702

5560B11


<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting21 Make sure that the ignitionis off (STOP position), then disconnect the negative battery terminal(refer to op. 33148615530B10battery - r+r ). Lower the steering wheel and move it back.1. Undo the bolts (1a) and remove the upper half casing for thesteering column (1b).2010703

5560B12


<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting21 Make sure that the ignitionis off (STOP position), then disconnect the negative battery terminal(refer to op. 33148615530B10battery - r+r ). Open the fuse carrier compartment flap.1. Using the tool (1a) and pushing the fuse carrier compartment,remove the surround (1b) complete with switches.2. Disconnect the elelectrical connections (2a), (2b) and (2c) andremove the surround complete with switches.2010706

Ignition switch



H1A



H1A



H1A



H1A



H1A



H1A



H1B



H1B



H1B



H1A



H1A



H1A



H1A



H1A



H1A



H1B



H1B



H1B



ignition switch



5520A12


<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting21 Make sure that the ignitionis off (STOP position), then disconnect the negative battery terminal(refer to op. 33148615530B10battery - r+r ). 3314931-5580C18air bag module - r+r . 7693315174-7040A26steering column trim - r+r . 3314624-4110A11steering wheel - r+r for replacement or check forversions with air bag . 3314902-5550A12complete stalk unit - r+r for versions with air bag . 1. Release the aerial for the electronic key from the ignition switch.2. Release the electrical wiring from the fixing band and disconnectthe electrical connection for the ignition switch.2010621

5520A14


768

brake and reversing lights



5550D16


<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting21 Make sure that the ignitionis off (STOP position), then disconnect the negative battery terminal(refer to op. 33148615530B10battery - r+r ). 1. Remove the caps (1a) and undo the bolts (1b) fixing the thirdbrake light to the rear parcel shelf.2. Disconnect the electrical connection (2a) and remove the thirdbrake light (2b).2010698

5550D17


<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting21 Make sure that the ignitionis off (STOP position), then disconnect the negative battery terminal(refer to op. 33148615530B10battery - r+r ). 3314911-5550D16third stop light - r+r . 1. Undo the bolts (1a) and remove the bulb holder (1b).2010699

5550D18


<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting21 Make sure that the ignitionis off (STOP position), then disconnect the negative battery terminal(refer to op. 33148615530B10battery - r+r ). 3315223-7040L20tunnel trim - r r1. Undo the nut (1a) and disconnect the earth lead (1b).2. Disconnect the electrical connection from the handbrake warninglight switch.3. Undo the nut (3a) and remove the handbrake warning light switch(3b).2010701

Left. front wheel sensor for ABS



K70



K70



K70



K70



K70



K70



K70



K70



K70



K70



abs check/adjustment devices



3340A12


<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting21Position the vehicle on theramp. Make sure that the ignition is off (STOPposition), then disconnect the negative battery terminal (referto op. 33148615530B10battery - r+r ). 3315196-7040D12engine front side cover (one) lh or rh - r r (left). 3315197-7040D14engine bay rear side cover (one) lh or rh - r r (left). Remove the cap with built-in brake fluidlevel switch and drain the brake/clutch fluid from the reservoir usinga suitable syringe.1. Disconnect the comb from the A.B.S. hydraulic and electroniccontrol unit.2. Release the A.B.S. pipes from their clip.3. Disconnect the pipes from the A.B.S. hydraulic and electroniccontrol unit and move them aside.2009904

3340A13


<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting21Position the vehicle on theramp. Make sure that the ignition is off (STOPposition), then disconnect the negative battery terminal (referto op. 33148615530B10battery - r+r ). 3315196-7040D12engine front side cover (one) lh or rh - r r (left) 3315197-7040D14engine bay rear side cover (one) lh or rh - r r (left) 3314591-3340A12A'B.S. system. - electronic and hydraulic CONTROLUNIT R.R. . Remove the protection1. Disconnect the front engine joint and release it from the fixingband.2. Disconnect the electrical connection from the cap and move theelectrical wiring aside.2009908

3340A26


<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting21Position the vehicle on thelift. Make sure that the ignition is off (STOPposition), then disconnect the negative battery terminal (referto op. 33148615530B10battery - r+r ). 3315196-7040D12engine front side cover (one) lh or rh - r r (left). 3315197-7040D14engine bay rear side cover (one) lh or rh - r r (left). 3314186-1088B12engine coolant reservoir mount - r r . 1. Release the front left wheel speed sensor wiring from its clip.2. Disconnect the front left wheel speed sensor electrical connection.3. Release from the bodywork the rubber cable pass for the frontleft wheel speed sensor wiring.2009917

3340A28


<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting21Position the vehicle on thelift. Make sure that the ignition is off (STOPposition), then disconnect the negative battery terminal (referto op. 33148615530B10battery - r+r ). 3315196-7040D12engine front side cover (one) lh or rh - r r (right) 3315197-7040D14engine bay rear side cover (one) lh or rh - r r (right) 1. Release the front right wheel speed sensor wiring from its clamp.2. Disconnect the electrical connection for the front right wheelspeed sensor.3. Release the rubber cable pass for the front right wheel speedsensor wiring from the bodywork.2009919

3340A35


<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting21Position the vehicle on thelift.3314864-5530B54battery cover - r+r . 3314861-5530B10battery - r+r . 3314863-5530B52Battery DRIP TRAY/SUPPORT - R.R. . 1. Disconnect the electrical connection (1a) for the rear rightwheel speed sensor and release the wiring from the clip (1b).2. Release the rubber cable pass from the rear left wheel speedsensor from the bodywork.2009921

3340A37


<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting21Position the vehicle on thelift. Make sure that the ignition is off (STOPposition), then disconnect the negative battery terminal (referto op. 33148615530B10battery - r+r ). 3315193-7040B22luggage compartment/load platform moulding - r+r . 3315192-7040B20back trim for luggage compartment/load platform -arrange . 3315127-7025B41boot lid lock . 3315188-7040B10load platform (luggage platform) trim - r+r . 3315190-7040B13load compartment/load platform right side trim -r r . 1. Undo the nut (1a) and bolt (1b), then move the anti-theft controlunit (1c).2. Disconnect the electrical connection of the rear right wheelspeed sensor.3. Release the rubber cable pass for the rear right wheel speedsensor wiring from the bodywork.2009923

Right. front wheel sensor for ABS



K71



K71



K71



K71



K71



K71



K71



K71



K71



K71



Left rear wheel sensor for ABS.



K75



K75



K75



K75



K75



K75



K75



K75



K75



K75



Rear right wheel sensor for ABS



K76



K76



K76



K76



K76



K76



K76



K76



K76



K76



Engine management control unit



M10A



M10A



M10A



M10A



M10A



M10A



M10A



M10A



M10A



M10A



M10A



M10A



M10A



M10A



M10A



M10B



M10A



M10A



M10A



M10A



M10B



M10B



M10B



M10B



M10B



M10B



M10C



M10C



M10C



M10D



M10D



M10D



M10D



M10E



M10E



M10E



M10E



M10F



M10F



M10B



M10A



M10A



M10A



M10A



M10A



M10A



M10A



M10A



M10A



M10A



M10A



M10A



M10A



M10A



M10A



M10B



M10A



M10A



M10A



M10A



M10B



M10B



M10B



M10B



M10B



M10B



M10C



M10C



M10C



M10D



M10D



M10D



M10D



M10E



M10E



M10E



M10E



M10F



M10F



M10B



Multiple tester connection



R10



R10



R10



R10



R10



R10



R10



R10



R10



R10



R10



R10



R10



R10



R10



R10



R10



R10



R10



R10



R10



R10


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