Workshop Manuals Factory service & repair Lancia
Lancia Thesis Factory Service Manual (2002-2009)22 · Fault diagnosis
22 · Diagnostics

Alarm siren not working

Make
Lancia
Model
Thesis Factory Service Manual
Year
2002–2009
Section
Alarm › Alarm siren not working
Fault diagnosisAlarm siren not working

ALARM SIREN NOT WORKING

The siren is connected to the Body Computer Node via the A-BUS dialogue line.

The siren is operated and controlled by the Body Computer Node via a series of encrypted messages;

if there is a failure the Body Computer Node detects and memorizes the causes of the malfunction.

STEPOPERATIONS TO BE CARRIED OUTTEST RESULTS
1CHECK USING DIAGNOSTIC EQUIPMENTALL OKPROBLEMS ENCOUNTEREDACTION

Connect the Examiner diagnostic equipment to the diagnostic socket and check the following at the Body Computer Node in parameters ambient:

  • the presence of the siren

In errors ambient:

  • that there are no faults with the siren
  • that there are no faults with the A-BUS
Move on to Step1. Siren faultyMove on to Step
2. Fault at A-BUSMove on to Step
3. Siren not present3. Check the conformity of the vehicle
2ELECTRICAL SYSTEM CHECK.ALL OKPROBLEMS ENCOUNTEREDACTION

Check the siren supply and earth

(Wiring Diagram ) E7015 ALARM

Move on to StepFault with electrical equipment

Restore the electrical connection

(Wiring Diagram ) E7015 ALARM

3ELECTRICAL SYSTEM CHECK.ALL OKPROBLEMS ENCOUNTEREDACTION

Check the continuity and the insulation of the A-BUS line between the Body Computer Node Computer and Siren

(Wiring Diagram ) E7015 ALARM

Move on to StepFault at A-BUS line

Restore the electrical connection

(Wiring Diagram ) E7015 ALARM

4CHECK USING DIAGNOSTIC EQUIPMENTALL OKPROBLEMS ENCOUNTEREDACTION

Connect the Examiner diagnostic equipment to the diagnostic socket and check the following at the Body Computer Node in parameters ambient:

  • the operation of the siren
Move on to StepThe siren is not activated

Replace the siren

See in Op. 5580E40 ANTI-THEFT SIREN - R.R.

5CHECK ON CORRECT OPERATIONALL OKPROBLEMS ENCOUNTEREDACTION
Check that the fault is no longer presentFault persists

Replace body computer

See in Op. 5505A32 BODY COMPUTER - R.R.

Parts & tools for this job Staging For 2002 Lancia Thesis

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