Diagnostic trouble code (DTC) information CEM-4F42

Condition 

Fig 1: Identifying Left Camera Module

Courtesy of VOLVO CARS OF NORTH AMERICA.

The central electronic module (CEM) monitors communication between the blind spot indication system (BLIS) LEDs and camera modules.

If the central electronic module (CEM) detects that the signal from the right LED to the right camera module (RCM) is too low, a diagnostic trouble code is generated.

The diagnostic trouble code can be diagnosed when the ignition is on.

Substitute Value 

• Nothing.

Possible Source 

• The signal lead to the right LED is shorted to ground.

Fault symptom[s] 

• The LED does not come on.