147 alarm problem - Alfa Romeo Forum
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(Post Link) post #1 of 5 Old 06-02-14 Thread Starter
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147 alarm problem

2002 Alfa 147 the alarm randomly goes of I have flash code 8 on the warning lamp after the alarm has gone off when turning the ignition on. does any one have a workshop manual that gives an idea what this code refers to. My alarm siren has also stopped bleeping when locking vehicle but the lights still flash. Also if you have the manual does the alarm siren act as the control unit or does it operate through the body control unit which in turn tells the siren to sound.
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1 flash one or more doors

2 flashes boot

3 flashes bonnet

4 flashes ultrasound module

5 flashes anti-tilt module

6 flashes +15

7 flashes +30/earth

8 flashes serial line (no signal/incorrect signal from siren for more than 3 times)

9 flashes at least three causes of alarm

================= Hi level description ===============

The intruder alarm system offers volumetric and perimeter protection.
A control unit (inside the Body Computer) controls:
status of doors, boot and bonnet via switches in the locks (perimeter control);
the presence of a moving object inside the passenger compartment, via volumetric sensors. (volumetric control)
the condition of system supply leads;
operation of the ignition switch.
The control unit is equipped with an autodiagnostic function which detects and memorizes faults in the control unit itself and the system components; it also checks the condition of link cables and stores the number of activations and the number of alarms.
The control unit operating software may be altered to meet regulations governing the use of alarm systems applicable in different markets.
For more details Characteristic of working principle 5580E anti-theft device .
The alarm siren is located at the front, under a Locary on the left of the engine compartment.
The remote control system consists of a sending unit built into the key and a receiver built into the Body Computer.
The same switches as for the central locking system are used to control the doors and lids. A special switch detects bonnet closure. (A buzzer goes off if the body computer detects that one of the doors or the boot is open and the car is travelling faster than 3 km/h).
The volumetric sensors check for car intruders. They are located in the two centre pillars. Both are twin sensors, i.e. consisting of an emitter and a receiver: the wave transmitted by an emitter 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.
The deterrent LED is located on the central control panel and indicates the state of the system (on, off, etc. ) plus any faults.
All external components are connected to the Body Computer via a dedicated serial line.

Last edited by jwq; 07-02-14 at 07:35.
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(Post Link) post #3 of 5 Old 07-02-14 Thread Starter
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thanks for the reply a great help I did think the bcm controlled the alarm signal. just needed it confirmed by the manual write up.
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Sounds like the country standards in the BCM need resetting to the UK. They can revert back to italian if the battery goes flat.
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Member car:

alfa 147 1.9 jtd

What is this sound? https://youtu.be/n5oxT_ziOLQ please help no faults just this sound on the ignition every time
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