Diagnostic trouble code (DTC) information CEM-7A03

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.