Diagnostic Trouble Code (DTC) Information CEM-8FF1

Condition 

Fig 1: Identifying Central Electronic Module (CEM)

Courtesy of VOLVO CARS OF NORTH AMERICA.

The central electronic module (CEM) checks the signal from the LED in the rain sensor button.

A diagnostic trouble code will be generated if the central electronic module (CEM) registers a signal from the LED in the rain sensor button that is too low.

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

Substitute Value 

• Nothing.

Possible Source 

• LED in rain sensor button short-circuited to ground.

Fault symptom[s] 

• The LED does not come on.