Diagnostic Trouble Code (DTC) Information

Condition

The control module continually supplies necessary information from the Central electronic module (CEM) via CAN communication. The control module checks the communication with the Central electronic module (CEM).

The diagnostic trouble code (DTC) is stored if the control module detects that:

Communication with the Central electronic module (CEM) is interrupted or missing.

The control module's test for the diagnostic trouble code (DTC) starts in the event of:

Ignition switch position II.

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.

Fig 1: Identifying Headlight Control Module (HCM)

Courtesy of VOLVO CARS OF NORTH AMERICA.

Substitute Value

None.

Possible Source

Fault-trace in transmitting control module.

Fault symptom[s]

Active Bi-Xenon light; No Functionality
Message in information display
Indicator lamp Active Bi-Xenon light; Flashing