Diagnostic trouble code (DTC) information CEM-4F91

Condition 

Fig 1: Identifying Sensor For Seat Belt Reminder

Courtesy of VOLVO CARS OF NORTH AMERICA.

The central electronic module (CEM) checks the signal from the sensor for the seat belt reminder in the passenger seat.

The diagnostic trouble code (DTC) is stored if the central electronic module (CEM) registers that the signal from the sensor is too low.

The diagnostic trouble code (DTC) can be diagnosed with the ignition on and the battery voltage above 9 V.

Substitute Value 

• None.

Possible Source 

• Short-circuit to ground in the signal cable
• Damaged sensor, seat belt reminder.

Fault symptom[s] 

• General warning lamp lit.