Diagnostic Trouble Code (DTC) Information CEM-8F12

Condition 

Fig 1: Identifying Headlamp Beam Height Control Unit

Courtesy of VOLVO CARS CORPORATION

The central electronic module (CEM) checks the signal for the headlamp beam height control.

The diagnostic trouble code (DTC) is stored if the central electronic module (CEM) detects that the voltage to the headlamp beam height control is below 10% of the supply voltage.

The diagnostic trouble code (DTC) can be diagnosed at ignition switch position II.

Substitute Value 

• None.

Possible Source 

• Damaged actuator motor for headlamp beam height control
• Open-circuit in the cable or short-circuit to ground.

Fault symptom[s] 

• Incorrect setting for low beam.