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.

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