Diagnostic Trouble Code (DTC) Information CEM-8D04

Condition 

The central electronic module (CEM) checks the signal from the stop lamp switch.

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

• Brake light is activated when Engine control module (ECM) informs that brake pedal is not depressed, and Central electronic module (CEM) detects abnormal current to brake light.

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

• Ignition position I and II, when HS-CAN is activated.

Fig 1: Identifying Central Electronic Module (CEM)

Courtesy of VOLVO CARS CORPORATION

Substitute Value 

• None.

Possible Source 

• Internal fault in the central electronic module (CEM).

Fault symptom[s] 

• Tail light/Brake lights constantly lit