B1785
Read the instructions below then start the fault diagnostic procedure.
Symptom: The message “SERVICE ANTI-THEFT ALARM” is shown on SID.
B1785 |
Fault symptoms
The message “SERVICE ANTI-THEFT ALARM” is shown on SID.Conditions
Break in the communication with the siren.Diagnostic help
May be due to a break/short-circuit in the wiring harness to the siren. Check fuse 6 in the fuse box in the engine bay.Main condition
The diagnostic trouble code is generated if a fault is found during two test cycles in succession. A test cycle lasts one second, i.e. it takes two seconds from when the fault occurs until a diagnostic trouble code is generated. If the fault disappears, the trouble code is cleared from the control module memory after the ignition has been turned on 20 times.Diagnostic trouble codes are not generated if the voltage is below 11 V or over 14 V.