Central Electronic Module (CEM)

Downloading software and replacing the control module
New software can be downloaded into the central electronic module. When ordering software, the hardware and the software in the car is compared to the Volvo central database. If the comparison is OK the software is downloaded to the control module.
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. For further information regarding downloading, see Design and Function, Software downloading.
The control module is in a relay box under the soundproofing panel on the driver's side. The control module needs to be removed from the relay box to be replaced.
When installing a completely new central electronic module in the car, PIN codes for the central electronic module, immobilizer and transponder (key) are downloaded into the control module. The PIN codes are loaded automatically during the ordering process in VIDA. The PIN codes are retrieved from the Volvo Central Database and sent with the software package when software is ordered for the new control module. Each transponder key must however, be programmed as each key has a unique code which must be stored in the central electronic module.
Because of the unique PIN codes, the central electronic modules cannot be moved between cars.
Three customer parameters (four for the V70/V70XC) can be programmed into the central electronic module. 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 the hardware is replaced.

The customer parameters which can be programmed are:

Seat temperature
- There are two values that can be programmed: low temperature and high temperature. Programming must be carried out so that the high temperature setting is higher than the low temperature setting.

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.

Daytime running lamps
- The daytime running lamps can be programmed in three ways:
1. Low beam in all switch positions except the parking light position (Flex zero)
2. The light switch functioning on the basis of: off, parking light and low beam (Flex standard)
3. Low beam always on regardless of the position of the light switch (Flex low).

Note! It is essential that the legal requirements of each country are followed.

Tailgate wiper (V70/V70XC)
- 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.