Checking Communication With The Headlight Control Module (HCM)

Fig 1: Identifying Ignition On Position

Courtesy of VOLVO CARS CORPORATION

HINT: The CAN communication with the control module is probably OK if the control module ID can be read off. In that case the fault is probably intermittent and will then be more difficult to trace. 

• Ignition on.
• Try to communicate with the headlight control module (HCM) by reading off the control module ID.
• Use the VCT2000 (or appropriate scan tool).

Fig 2: Identifying VCT2000 Diagnostic Tool Symbol In VIDA

Courtesy of VOLVO CARS CORPORATION

• Continue 

  Refer to SIGNAL MISSING