Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information CEM-B1D1787

Condition
Central electronic module (CEM) checks the function of siren (SCM) via control messages.
The diagnostic trouble code (DTC) is stored if the control module detects that:
- Communication with siren (SCM) is lost.
The control module's test for the diagnostic trouble code (DTC) starts in the event of:
- Activation of the alarm function.

Note! The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.





Substitute value
- None.

Possible source
- Open-circuit in the signal cable to the siren control module (SCM).
- Open-circuit in the ground lead to the siren control module (SCM).
- Open-circuit in the power supply to the siren control module (SCM).
- Blown fuse.
- Internal fault in the siren control module (SCM).

Fault symptom[s]
- 7T, Alarm/Alarm will not set off/No visible and/or audible signal
- KH, Alarm/False alarm