Diagnostic Trouble Code (DTC) Information CEM-7A04

Condition 

Fig 1: Identifying Volume- Button

Courtesy of VOLVO CARS OF NORTH AMERICA.

The central electronic module (CEM) checks the signal from the Volume+ button.

The diagnostic trouble code (DTC) is stored if the central electronic module (CEM) registers that the Volume+ button has been active for more than 1 minute.

The diagnostic trouble code (DTC) can be diagnosed when the ignition is switched on.

Substitute Value 

• None.

Possible Source 

• The Volume+ button is jammed in the pressed in position
• Damaged Volume+ button.

Fault symptom[s] 

• The radio buttons on the steering wheel do not function
• The phone buttons on the steering wheel do not work.