Alarm & Remote Central Locking System - Alfa Romeo Forum
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Thumbs Up Alarm & Remote Central Locking System

Just putting this information i found while searching as the questions come up and fair amount ,

Copied from another good source for Alfa Information With link for picture support

Alfa Romeo forum: alarm not working


Here is a full technical description of the alarm system.
I hope you can find some help in it...

You have some reading to do, mate...


...from the NEW e-Learn Workshop Manual...

ALARMS
The alarm system offers volumetric and perimeer protection for the vehicle.

An electronic control unit monitors the following:

the closure state of the doors and lids (perimeter control)
the presence of a moving object inside the passenger compartment (volumetric control)
the operation of the ignition switch
the condition of the supply cables for the vehicle and the emergency key.
The radiofrequency type of remote control adopted facilitates the activation operations because this system has a high capacity, which is non directional and not affected by the transparency and cleanliness of the windows.

In addition, the system for transmitting the secret code between the remote control and the receiver is a rolling code, in other words a cipher code which is different each time.


System components
The alarm system consists of:

two (or more) keys with remote control
an electronic control unit with a built in siren
a remote control receiver
Volumetric sensors
an LED (device activated indicator)
an emergency key (not planned for certain markets)
a bonnet opening switch (incorporated in the lock)
a boot opening switch (incorporated in the lock)
a doors open switch (incorporated in the locks).



1, Alarm electronic control unit with siren incorporated

2, Diagnostic socket

3, Emergency key

4, LED

5, Receiver

6, Volumetric sensors

7, Doors, boot and bonnet switches

8, Remote control in the key


Keys
2 keys are supplied with a transponder and remote control transmitter.

The transponder is used by the Code system (see DESCRIPTION AND OPERATION: ALFA ROMEO CODE).

The remote control incorporated in the key consists of an electronic circuit and a radiofrequency transmitter supplied by a battery.

Each time the remote control button is pressed, it sends the radio code within a range of 10 metres.

The LED in the key flashes to signal that the button has been operated correctly.

It also signals when the battery is run down by giving a single brief flash each time the actual button is pressed.

If the button remains pressed for more than 80 seconds, the control signal is stopped in order not to run the battery down unnecessarily. The signal is activated by releasing the button and pressing it again.

Each remote control (and therefore each key) contains its own special code.

Up to 5 keys (remote controls) can be programmed in one receiver.

The keys are supplied by the production plant already programmed. All the codes are then stored in a DATA BASE managed by the Parts Department. Therefore when a new vehicle is handed over to a customer, the Service Network should not carry out any programming procedure.If one of the keys is mislaid or there is a request for additional keys, then this request should be passed on to the Parts Division according to the following procedure.



1, Transponder (see Alfa Romeo Code)

2, Remote control operating button

3, Remote control repeater LED


Alarm control unit
An electronic control unit manages the entire system checking all the components.

The main function of the control unit is to check:

the state of the doors and the lids, through the switches in the locks
the presence of a moving object inside the passenger compartment, via volumetric sensors.
the condition of the system supply cables (both directly from the battery and those controlled by the ignition)
the condition of the supply cables for the emergency key (if fitted)
the operation of ignition switch
The control unit is equipped with a self-test function which detects and memorizes faults in the control unit itself and the system components and also checks the condition of the connecting cables.

The control unit also memorizes the number of times the alarm is activated and set off.

The control unit operating software may be altered to meet regulations governing the use of alarm systems applicable in different markets. (see 'COUNTRY CODE' programming)

The electronic control unit incorporates the siren.

The siren can operate at different levels according to the programming for the various countries (see description which follows).

The control unit is located at the front, under the Locary on the left of the engine compartment.

Control unit pin-out
Refer to the illustration



Connector A, 12-way

1 Deterrent LED

2 N.C.

3 Direct supply

4 Emergency key OFF

5, Anti-tilt module supply (Outlets not connected on this version) For further details see wiring diagram, ALARM function See E7015 ALARM )

6 Diagnostic line K and connection with receiver

7 Emergency key ON

8 Volumetric sensors supply

9 Control unit earth

10 Anti-tilt module signal (Outlets not connected on this version For further details see wiring diagram, ALARM function See E7015 ALARM )

11 Volumetric sensors earth

12 Volumetric sensors signal

Connector B, 18-way

1 Right branch direction indicators control

2 Left branch direction indicators control

3 Preparation for external relay contact (Outlets not connected on this version.

For further details see wiring diagram, ALARM function See E7015 ALARM )

4 N.C.

5 N.C.

6 N.C.

7 Direction indicators supply

8, Left front door signal

9, Right front door signal

10 N.C.

11 N.C.

12 Supply controlled by the ignition

13 Emergency key supply

14 Doors open signal (check panel operation) (Outlets not connected on this version) For further details see wiring diagram, ALARM function See E7015 ALARM )

15 Rear left door signal

16 Rear right door signal

17 Boot lid signal

18 Bonnet lid signal

Receiver
The receiver is an electronic device which receives the transmitter signal. It is located in the rear part of the roof panel.

It is connected to the control unit via the serial line and directly manages the following system functions:

it receives, decodes and manages the remote control signals
it locks and unlocks the doors
it memorizes the codes for enabled transmitters.
The receiver contains the PASSWORD used to programme (enter or delete) the various codes in the transmitters.

The receiver also has its own autodiagnostic function which detects and memorizes faults in the actual receiver and the components connected to it and it checks the condition of the connecting cables.

Each receiver is programmed by the production planT. All the codes are then stored in a DATA BASE managed by the Parts Division. Therefore when a new vehicle is handed over to a customer, the Service Network should not carry out any programming procedure. If a receiver is being replaced, the request should be forwarded to the Parts Division following the procedures described below.

Receiver pin-out
Refer to the illustration



Connector, 16-way

1 Direction indicators control (*)

2 Diagnostic line K and connection with alarm control unit

3 Direct supply

4 Earth

5 Door 'unlocking' control

6 Door 'locking' control

7 Supply controlled by the ignition

8 Courtesy lights control (Outlets not connected on this version)

9 Electric windows control (Outlets not connected on this version)

10 N.C.

11 N.C.

12 N.C.

13 N.C.

14 N.C.

15 N.C.

16 N.C.

For further details see wiring diagram, function See E7015 ALARM and See E3040 CENTRAL LOCKING

Emergency key
(not planned for certain Markets)

The emergency key for deactivating the system is located on the left of the dashboard, next to the junction unit, in a position that is easily and quickly accessible.

It makes it possible to exclude the system, for example in the case of repair operations:

by turning the key in an anti-clockwise direction, the system is deactivated: emergency key in OFF position
by turning the key in a clockwise direction, the system is activated: emergency key in ON position.



1, Emergency key

2, Protective cover


Switches
The same switches as for the central locking system are used to control the doors and lids. For further details see wiring diagram, function See E3040 CENTRAL LOCKING

There is, however, a special switch in the bonnet lid lock.



1, Bonnet lid opening switch

2, Bonnet lid lock


Volumetric sensors
The volumetric sensors allow additional surveillance because they check that there are no intrusions in the vehicle. These are located on two central car pillars

Both are 'dual' sensors, i.e. each consists of a transmitter and a receiver

The wave sent by a transmitter should reach the receiver of the other sensor and viceversa: if this is not the case, an alarm signal is sent to the control unit.

One pair monitors the front part of the passenger compartment, the other pair controls the rear, as shown in the following diagram: (E = transmitter C = receiver).


1, Right-hand side volumetric sensor

2, Left-hand side volumetric sensor


Deterrent led
The dissuasion LED is located in the dashboard, in the centre above the air vent and signals the state of the system (on, off, etc.) plus any faults.



1, Deterrent LED


System operation
Switching on
it is only possible to switch on the alarm with the ignition key in the OFF or PARK positions or with it extracted.

The alarm is activated by pressing the button in the remote control. It has an operating range of about 10 metres.

When the command has been given, the door locks are locked, the siren sounds and, at the same time, the direction indicators come on for about 2.5 seconds; the deterrent LED also flashes. the deterrent LED also flashes.

the activation of the auditory signals and the flashing of the direction indicators depends on the various country modes (see description which follows).


Switching off
The alarm is switched off by pressing the remote control button.

When the command has been given, the doors are unlocked, the siren sounds briefly twice and, at the same time, the direction indicators flash twice.

the activation of the auditory signals and the flashing of the direction indicators depends on the various country modes, as described later on.


Switching on with siren excluded
The operation of the siren can be excluded during the surveillance stage: when switching on, press the remote control button for more than 4 seconds.

After the auditory signals connected with the engagement, there are 5 auditory signals in quick succession to indicate that the siren has been excluded.

Next time it is switched on, the exclusion procedure should be repeated, if the siren is to be excluded once again.

Excluding the system
The system can be deactivated with the emergency key (OFF position) if:

the remote control batteries are run down
the system is faulty
the vehicle is not used for long periods (more than 3 weeks).
When the vehicle is handed over, the emergency key should be in the ON position.

The system cannot be deactivated on vehicles destined for markets where the emergency key is not fitted.

Surveillance stage
During the 'surveillance' stage (vehicle closed and alarm switched on), the deterrent LED flashes at a frequency of 0.8 Hz and, in this state, the system:

surveys the closing of the doors, bonnet and boot lid
detects the condition of the connecting cables for the positive from the battery and earth
detects the condition of the connecting cables for the emergency key
detects the unauthorized insertion of the ignition key;
surveys movements inside the passenger compartment (volumetric surveillance).
Alarm state
The alarm comes into operation when one of the surveillance sensors detects an irregular situation.

The alarm state (if the cause of the alarm persists) can be recognized as follows:

the siren is activated (for a maximum of three cycles lasting 26 seconds)
the direction indicators are activated for about 4-5 minutes (only in countries where the law permits);
It is possible to escape from the alarm situation:

by pressing the remote control button;
by deactivating the emergency key (in this case, the control unit remains in the 'surveillance' condition).
This second procedure should only be used if it is not possible to escape from the alarm situation by pressing the remote control button.

Inhibiting volumetric surveillance
It is possible to inhibit the volumetric surveillance, before switching the system on. Proceed as follows:

starting with the ignition key in the ON position, turn in quickly to OFF, ON and then OFF.
The exclusion of the volumetric surveillance is confirmed by the deterrent LED coming on for 2 seconds.

When the ignition key is next switched ON (for more than 30 seconds) the volumetric surveillance will be re-enabled. This period of 30 seconds allows, for example, the electric windows to be closed, which, if they have been left open by mistake, will maintain the exclusion of the volumetric surveillance.

Alarm self-activation (only belgian and uk markets)
Cars with alarms programmed for the Belgian and UK markets are equipped with self-activation function.

This function ensures that the alarm is automatically partly engaged (the doors are not locked): the alarm is engaged 28 seconds after the customer leaves the vehicle, in other words after the system has detected the following sequential conditions:

ignition key turned from ON to OFF;
last open door opened and then closed.
The opening of any door, or the bonnet lid or the boot lid, before the delay period (28 seconds) has elapsed stops the automatic engagement. The closure restores the counting, starting, however, from zero.

To regain possession of the vehicle after the auto-engagement, simply press the remote control button once.

Signalling of remote control batteries discharged
The signal involves the remote control LED giving one brief flash when the button is pressed.

When this signal occurs, the batteries should be replaced as soon as possible.

After the batteries have been replaced, the LED will work properly after the second time the button is pressed.

The deterrent LED also signals that the remote control batteries are run down by coming on constantly for a maximum of 2 minutes when the system is switched off.

'country code' programming
The control unit is capable of adapting its operation to the laws governing alarm systems in force in the various markets. There are different operating modes ('COUNTRY CODE') available in the actual control unit memory for the sound of the siren and the flashing of the direction indicators. These functions are sometimes excluded.

The 'EEC' operating mode is selected in production.

To change this setting, it is possible to use the special procedure using the Examiner or other diagnostic equipment.

Alternatively, and only in the case of an emergency, the following procedure can be used:

1 Check that the emergency key is switched ON.

2 Turn the ignition key to the ON position.

3 Open the bonnet (front) lid.

4 Turn the ignition key from ON to OFF.

5. Within 15 seconds, press the bonnet lid button 7 times in quick succession. This manoeuvre should be carried out in less than 10 seconds. The last time the button is pressed, keep it pressed;

6. 5 brief auditory signals (5 in 2 seconds) followed by one long one (lasting 2 secnods) indicate the entry in the operating mode programming.

7. Release the bonnet lid button.

8 Within the next 10 seconds, press and release the button a number of times equivalent to the desired country identification number, given in the table below (each time the button is pressed there will be an auditory confirmation signal).

9. Wait for 10 seconds; an auditory signal lasting a second will indicate the exit from the programming mode system.

COUNTRY CODE TABLE

Code, Country

1, Default (EEC)

2, United Kingdom

3, Belgium

4, Switzerland

5, Holland

6, WORLD

System self-diagnosis
Both the control unit and the receiver are equipped with a self-test function.

When the alarm is switched on, the operation of the system is continuously checked.

- when the system is switched on an autodiagnosis is carried out which can be recognized by the LED flashing, in accordance with the table below:

FLASHING MODE, MEANING

4 4 Hz (= 4 flashes in a second): No fault detected

8 8 Hz (= 8 flashes in a second): Door/bonnet/boot open or switch faulty

Light on constantly: Volumetric sensors faulty

If a fault is detected, the component in question is excluded from the surveillance and an auditory warning signal is emitted one second after engagement.

- when the system is switched off, this is indicated by the LED for the sensor which set off the alarm during the surveillance flashing, in accordance with the details in the table below:

NO. PULSES, Component in alarm status

1 1 Impulse, Right front door

2 Impulses, Left front door

3 3 Impulses, Right rear door

4 4 Impulses, Left rear door

5. 5 Impulses, Volumetric sensors

6. Impulses, Bonnet lid

7. Impulses, Boot lid

8 Impulses, Supply controlled by the ignition

9 Impulses, Supply cables cut

10 Impulses: At least 3 simultaneous causes of the alarm

Light on constantly: Remote control batteries run down

An impulse consists of a flash at a frequency of 1 Hz (1 flash per second).

If several causes for the alarm are detected, the blink codes occur in orders, with an interval of 1.5 secs in between.

If the ignition key is turned to the ON position, the signal is interrupted.

Use of the examiner or other tester
Ths system has its own diagnostic line and it is therefore possible to detect information stored in the control unit and receiver memories using the Examiner or other diagnostic equipment.

The control unit and the receiver provide information concerning their tate and recognize any irregularities in all the system components and connections.

Once the faults have been repaired, it is posible to cancel the faults memorized by the control unit.

It is also possible to carry out the remote control programming procedures, using the Examiner, following the instructions given below.

Manual diagnosis
It is possible to carry out a manual diagnosis of the entire system, in cases of emergency, if an Examiner or other diagnostic equipment is not available.

Proceed as follows:

1 Close the doors, windows, boot lid and bonnet.

2 Check that the emergency key is switched ON.

3 Turn the ignition key to the ON position.

4 Open the bonnet.

5. Turn the ignition key from ON to OFF.

6. Within 15 seconds, press the bonnet lid button 7 times in quick succession. This manoeuvre should be carried out in less than 10 seconds. Release the button the last time it is pressed;

7. 5 brief auditory signals and a flash of the direction indictors indicate the entry in the 'manual diagnosis' mode.

8. After several seconds the result of the volumetric sensors fault diagnosis is given:

if the direction indicators flash once only, there is a fault in the volumetric sensors.
if the direction indicators flash 3 times and there are three auditory signals, then there are no faults with the volumetric sensors.
9. Operate the switches for the doors and lids, one at a time:

if the direction indicators and the deterrent LED flash briefly for each change in state of the switch, then there is no fault with the switch in question
if there is no signal from the direction indicators and the deterrent LED for each change in state of the switch, and there are no auditory signals, then there is a fault with the switch in question.
10. Exit the manual diagnosis procedure by turning the ignition key to the ON position. There will be an auditory signal from the siren (500 msecs) and the direction indicators will flash (2.5 secs); it is also possible to exit from manual diagnosis by doing nothing for 30 secs

The exit is signalled by the direction indicators coming on for about 2.5 secs and an auditory signal.

Data base
There is a centralized DATA BASE (for all markets) managed by the PARTS DEPT. for ordering some system components.

receiver
keys
The production plant transfers all the details needed into this DATA BASE together with the chassis number of the new vehicle.

This PARTS DATA BASE should be used by the Service Network for ordering replacement components.

The DATA BASE contains various information, including:

vehicle chassis number
ID1, ID2, (up to a maximum of 8)
PASSWORD
mechanical key code
the codes for the remote controls which are specific for each key: it is not possible to recreate a remote control with the same code as the one lost.


Intervention procedures
Loss of key(s)
1. Ask the customer for all the keys remaining in his possession. He should also prove that he owns the vehicle by showing the registration document and a valid identity document.

2. Carry out the PROGRAMMING OF THE remaining KEYS using the Examiner or other diagnostic equipment, working in the Code control unit. In this way keys which have not been presented will never be able to be used. A list of keys which are still valid will also be printed.

3. Programme the remaining REMOTE CONTROLS using the Examiner or another diagnostic instrument, working on the alarm control unit. In this way keys which have not been presented will no longer be able to be used.

4. Connect with FIAT PARTS giving the vehicle chassis number and other details as requested. Place an order for one or several keys, for the vehicle in question.

5. By consulting the DATA BASE and on the basis of the chassis number, FIAT PARTS can make a key which has:

the same shape (but indicates that it is a replacement part).
Transponder with new ID3 , but with secret code of the Code control unit of the vehicle in question
same mechanical code (metal insert)
new remote control code TX3 .
In addition, the DATA BASE is updated by the entry of the new ID3 .

6. FIAT PARTS should send the key to the Service Network within 24 - 48 hours.

7. Programme the keys using the Examiner or another diagnostic instsrument, working on the Code control unit, entering both the new key(s) and the previous key(s).

8. MEMORIZE THE REMOTE CONTROLS using the Examiner or another diagnostic instrument, working on the alarm control unit, entering both the new key(s) and the previous key(s).

To do this, the receiver's PASSWORD must be entered. Ask FIAT PARTS for this PASSWORD, again stating the vehicle's chassis number.


9. Conduct a final check on both the Code system and the alarm system using the Examiner or other diagnostic equipment

Requesting a new key
Up to 5 keys (remote controls) can be programmed in one receiver.

Proceed as described above, skipping step 2 which in this case is superfluous.

Replacing key lock barrels
1. Ask the customer for all the keys remaining in his possession. He should also prove that he owns the vehicle by showing the registration document and a valid identity document.

2. 2.CANCEL THE MEMORIZED KEYS using the Examiner or another diagnostic instrument, working on the Code control unit and not the alarm control unit. These keys will never be able to be used again.

3. Connect with FIAT PARTS giving the vehicle chassis number and other details as requested. Place an order for a complete key kit for the vehicle in question.

It is not possible to order only the lock barrel, or the kit, by giving only the mechanical code of the keys.

4. By consulting the DATA BASE and on the basis of the chassis number, FIAT PARTS can make a complete key kit which has:

the same shape (but indicates that it is a replacement part).
Transponder with new ID3 . ID4 , but with the secret code for the Code control unit for the vehicle in question.
new mechanical code (metal insert)
new remote control codes TX3 . TX4 .
A new Code Card, with the previous recovery code but a new mechanical code, is also supplied.

In addition the DATA BASE is updated by the entry of the new ID3 and ID4 and the new mechanical code.

5. FIAT PARTS should send the key kit to the Service Network within 24-48 hours.

6. Programme the KEYS using the Examiner or another diagnostic instrument, working on the Code control unit, entering all the keys received.

7. MEMORIZE THE REMOTE CONTROLS using the Examiner or other diagnostic instrument, working on the alarm control unit, entering all the keys received.

To do this, the receiver's PASSWORD must be entered. Ask FIAT PARTS for this PASSWORD, again stating the vehicle's chassis number.


8 Conduct a final check on both the Code system and the alarm system using the Examiner or other diagnostic equipment

Replacing the receiver
A suspected fault in the receiver should always be confirmed by carrying out a thorough check using the Examiner or other diagnostic equipment.

1. Ask the customer for all the keys remaining in his possession. He must also prove that he owns the car by showing the registration document and a valid identity document.

2. Connect with FIAT PARTS giving the vehicle chassis number and other details as requested. Place an order for a receiver.

3. FIAT PARTS should send a new, unprogrammed, receiver.

4. Fit the receiver in place of the fault one.

5. PROGRAMME THE REMOTE CONTROLS using the Examiner or other diagnostic equipment, working on the alarm control unit and not the Code control unit, entering all the keys present.

To do this, the receiver's PASSWORD must be entered. Ask FIAT PARTS for this PASSWORD, again stating the vehicle's chassis number.


6. Conduct a final check on the alarm system using the Examiner or other diagnostic equipment.

Replacing the alarm control unit
A suspected fault in the alarm control unit must always be confirmed by a thorough check carried out using the Examiner or another diagnostic instrument.

If the alarm control unit is replaced, it is NOT necessary to PROGRAMME THE REMOTE CONTROLS using the Examiner or other diagnostic equipment, but simply to carry out the simplified CONTROL UNIT PROGRAMMING procedure which 'passes over' all the data and codes in the receiver to the new control unit.

If the control unit is replaced, conduct a final check on the alarm system using the Examiner or other diagnostic equipment.
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All spares parts for 156 and 147 being sold that i will not be using (cheap) nothing too small ask what you want , willing to post world wide Phone 07922123242 Ask for Neil and say Mark said to phone .

Download link for Alfa 156's http://www.filedropper.com/alfaelearn
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Given the complexity it must be appealing to not refit an alarm. If I heard mine sound in the night my first assumption and that of my neighbours would be that my car is broken. A Thatcham full steering lock will stop a car being taken. Neither lock or alarm stop vandalism.
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