Siren
1. Check the connectors and wiring. 2. Check that pin B-10 is not connected to earth. 3. Check that the feed voltage at connector C78-10 and pin N9-1 is 24 V (the alarm control unit must be connected). 4. Check that the backup voltage at connector C78-11 and pin N9-2 is 10-13.6 V (the siren must be connected). 5. Check that the voltage at connector C78-12 and pin N9-3 is 12 V (the siren must be connected). 6. Check that there is earth at connector C78-13 and pin N9-4 (the alarm control unit must be connected).
What you'll see
No driver-visible symptom recorded.
System reaction
No system-reaction text recorded.
Diagnostic depth
The siren has lost communication with the alarm control unit.
The fault can be caused by the following: - Short circuit to earth. - Open circuit in the communication cable between the alarm control unit and the siren - The siren is not connected