Central Electronic Module (CEM)

Downloading software and replacing the control module

New software can be downloaded into the central electronic module (CEM). When ordering software, the hardware and the software in the car is compared to the information in the Volvo central database. If the comparison is OK the software is downloaded to the control module. The PINs for the existing remote controls are downloaded at the same time.
If the comparison between the car and Volvo central database is not OK, the database is updated with the car configuration. When this is complete the software is downloaded.
When installing a completely new central electronic module (CEM) in the vehicle, the PIN codes are downloaded into the control module (when downloading software) for the following:
- central electronic module (CEM)
- immobilizer
- transponder (key).
The PIN codes are downloaded automatically in the order procedure available in VIDA. The PIN codes are retrieved from the Volvo central database and are sent in the software package when software is ordered for the new control module.
The central electronic module (CEM) is below the glove compartment on the passenger side. The entire control module is removed from the car during replacement.
Because of the unique PIN codes, the central electronic module (CEM) cannot be moved between cars.
Five customer parameters (six for 5 door cars) can be programmed into the central electronic module (CEM). These customer parameters are stored in the control module but not in the Volvo central database. This means that the customer parameters must be reprogrammed when hardware is replaced.
The customer parameters which can be programmed are:
- Approach lights. The approach lights can be programmed to stay on for a longer or shorter time according to the wishes of the customer. The factory setting is 30 seconds. The time can be set to 0, 30, 60 or 90 seconds
- Security lighting The security lighting can be programmed to stay on for a longer or shorter time according to the wishes of the customer. The factory setting is 30 seconds. The time can be set to 0, 30, 60 or 90 seconds
- Automatic locking. If this function is activated, the side doors lock when the speed exceeds 7 km/h (5 mph). Selectable values: On / off
- Locking indication via the turn signal lamps. If this function is activated, the turn signal lamps flash when the car is locked and unlocked. Selectable values: On / Off
- Tailgate wiper (certain models). The tailgate wiper function can be programmed in two ways:
1. The tailgate wiper can only be activated manually
2. The tailgate wiper can be activated automatically when back-up (reverse) gear is selected and the front wipers are activated.
For cars with Bi-Xenon lamps, the position sensors for headlamp range adjustment must be calibrated if the central electronic module (CEM) (-2007) is replaced. This is carried out in VIDA via the vehicle communication socket.
For more information about lock and alarm functions, see Design and Function, Central locking and Design and Function, Alarm.