Alfa Romeo GT 1.8 T.SPARK – CENTRAL LOCKING – – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION

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Wiring diagram - CENTRAL LOCKING - Alfa Romeo GT 1.8 T.SPARK

CENTRAL LOCKING - WIRING DIAGRAM Alfa Romeo GT 1.8 T.SPARK

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Components - CENTRAL LOCKING - Alfa Romeo GT 1.8 T.SPARK

Component code	Name	Assembly reference
B1	JUNCTION UNIT	-
B2	JUNCTION UNIT UNDER DASHBOARD
B5	MAXI FUSE-1 BOX	-
B99	MAXIFUSE BOX ON BATTERY
C15	FACIA EARTH, DRIVER''S SIDE	-
C38	EARTH ON TUNNEL	-
D30	REAR COUPLING FOR /FRONT DOOR. DRIVER''S SIDE	-
D31	RIGHT FRONT DOOR REAR COUPLING/.	-
D97	SHORT CIRCUITING COUPLING	-
E50	INSTRUMENT PANEL
H1	IGNITION SWITCH
H12	HAZARD WARNING LIGHTS, FOG LIGHTS, REAR FOG LAMPS CONTROL
M1	BODY COMPUTER
N50	RIGHT FRONT DOOR LOCK LEFT
N51	RIGHT FRONT DOOR LOCK MOTOR
P93	RECEIVER AERIAL FOR ALARM AND CENTRAL LOCKING ( FRONT )	-

Location of components - CENTRAL LOCKING - Alfa Romeo GT 1.8 T.SPARK

CENTRAL LOCKING - LOCATION OF COMPONENTS Alfa Romeo GT 1.8 T.SPARK

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Components - CENTRAL LOCKING - Alfa Romeo GT 1.8 T.SPARK

Component code	Name	Assembly reference
B1	JUNCTION UNIT	-
B2	JUNCTION UNIT UNDER DASHBOARD
B5	MAXI FUSE-1 BOX	-
B99	MAXIFUSE BOX ON BATTERY
C15	FACIA EARTH, DRIVER''S SIDE	-
C38	EARTH ON TUNNEL	-
D30	REAR COUPLING FOR /FRONT DOOR. DRIVER''S SIDE	-
D31	RIGHT FRONT DOOR REAR COUPLING/.	-
D97	SHORT CIRCUITING COUPLING	-
E50	INSTRUMENT PANEL
H1	IGNITION SWITCH
H12	HAZARD WARNING LIGHTS, FOG LIGHTS, REAR FOG LAMPS CONTROL
M1	BODY COMPUTER
N50	RIGHT FRONT DOOR LOCK LEFT
N51	RIGHT FRONT DOOR LOCK MOTOR
P93	RECEIVER AERIAL FOR ALARM AND CENTRAL LOCKING ( FRONT )	-

Description - CENTRAL LOCKING - Alfa Romeo GT 1.8 T.SPARK

The door locks are operated simultaneously by:the key;the door handles;the button on the dashboard;the remote control.Lock operation is managed by the Body Computer, which controls:the actual state of the locks by means of the signals which arrive from the switches located on the locks themselves (signals also used for timing the lights): in this way, the ''lock'' command is only issued when all the doors are properly closed and the locks released; conversely, the ''release'' command is only issued when the locks are locked;the switch position. If this position does not agree with the action carried out (e.g. if after the lock command a door is open), a repulsion command is issued, i.e. the opposite manoeuvre is carried out to realign all the locks.several consecutive and complete lock/release manoeuvres: if the control unit detects at least 10-11 manoeuvres within 25 seconds - the system cuts in to limit the manoeuvres: the system remains inhibited in the unlock position for 30 secondsif the battery voltage falls below 8-10 V during a lock/release operation, the system suspends the operation. If battery voltage is lower than 8 V at the outset, no command is issued.The signals coming from the door (and boot) open switches together - when the ignition is on - switch on the specific warning light on the instrument panel.The remote control receiver aerial is connected directly to the Body Computer which contains the electronics of the receiver proper: the remote control in the key has two separate buttons: one controls the door lock, the other the release (a third button controls the boot release).If within 60 seconds from the lock release command issued via the remote control, the user has not shown his intention to take possession of the car (opening of doors and/or boot and ignition turned on), the locks are automatically LOCKED.The door lock/release button is located on the central panel: if the doors are closed, pressing the button releases them; vice versa if they are open, they are locked; an LED at the back of the button also comes on.The doors are automatically released if the inertia switch is activated: the instrument panel receives a signal from the switch, lights up the relevant warning light and communicates the activation to the Body Computer via the CAN network.The door lock circuit is protected by a special fuse located in the unit under the dashboard.

Functional description - CENTRAL LOCKING - Alfa Romeo GT 1.8 T.SPARK

The door lock command, inside the Body ComputerM1- pin 1 of connector F - has the supply line protected by fuse F38 in the unit under the dashboardB2; also has a dedicated earth connection: pin 20 of connector F.The Body Computer M1 receives as input:the ''lock'' signals from the handles (or key in the lock) at pins 24 (driver''s front door - N50) and 17 (front passenger''s door - N51) of connector E.the ''release'' signals from the handles (or key in the lock) at pins 34 (driver''s front door - N50) and 35 (front passenger''s door - N51) of connector E.the ''door open'' signals at pins 8 (driver''s door - N50) and 25 (front passenger''s door - N51) of connector E;the signal from the lock/release button, located in the controls unit H12 , at pin 2 of connector D; (the button is lit when the doors are locked by the ignition-dependent line (INT) of fuse F49 of unit B2 );the signals coming from the aerial-receiver P93 , which is connected to pins 21 and 31 of connector A.In accordance with the control logic described above, the Body ComputerM1 controls the lock motors of the driver''s front door N50 and front passenger''s door N51, from pins 10 and 11 of connector F.Body ComputerM1connects to instrument panelE50via the CAN line. The computer sends a signal that turns on the door open warning light when required.The intervention of the inertia switchI50 is signalled to pin 12 of connector A of E50 via the CAN line, the instrument panel E50 is connected to the Body Computer M1 and this signal causes the unlocking of the doors.