Central Electronic Module (CEM), Replacing

Central electronic module (CEM), replacing

Note! The illustrations in this service information are used for different model years and/or models. Some variation may occur. However, the essential information in the illustrations is always correct.

For further information, see Downloading software and replacing the control module Central Electronic Module (CEM)

Preparatory work

Disconnecting the battery lead

Caution! The customer-programmed data must be read off before the control module is replaced. The relevant data must then be programmed into the new control module, via VIDA vehicle communication, after it has been installed.




Ignition off
Disconnect the battery negative cable. See: Battery, disconnecting Battery Disconnecting.

Note! For vehicles equipped with Volvo On Call Plus, the automatic alarm for the emergency services may deploy.

Note! The driver information module (DIM) must not be replaced at the same time. This would erase the mileage.

Removal

Removing the wiper mechanism and cover




Remove the wiper mechanism according to: Wiper mechanism windshield, replacing Wiper Mechanism Windshield, Replacing





Removing the soundproofing panel on the driver's side




Remove the 2 screws.

Hint: The soundproofing panel sits in a groove at the pedal box.

Remove the soundproofing panel by pulling it straight down and back.

Removing the central electronic module (CEM)





Remove:
- the connectors
- the control module by inserting a screwdriver up between the bracket and the relay box. Twist the screwdriver so that the bracket opens out. At the same time, pull the control module out of the bracket towards the underside of the dashboard
- the control module from the bracket and pull downwards under the dashboard.
Remove the fuses from the central electronic module (CEM).

Hint: For the location of the fuses, see Locations

- The wiring diagram for the relevant model year
- The decals by the relevant fuse box in the vehicle
- The Pocket Data booklet
- The Owner's manual.

Installation

Installing the central electronic module (CEM)

Caution! The pins are fragile. Check that the connectors go straight down into the control module.

Install:
- the control module on the bracket. Press the control module forward so that the catches enter the bracket
- the connectors
- the soundproofing panel on the driver's side
- the 2 screws on top of the control module
- the 2 connectors on top of the control module.

Note! Make sure that the rubber seal is correctly positioned in the groove.

Install:
- the cover
- the wiper arm mechanism. See: Wiper mechanism windshield, replacing Wiper Mechanism Windshield, Replacing
- the battery negative lead. See: Battery, disconnecting Battery Disconnecting.

Finishing

Ordering software
Order software. Software Downloading

Programming data
Program in the data read off from the old control module (customer-programmed data for example). This is performed via VIDA vehicle communication.
Reset the service reminder indicator (SRI). Otherwise the lamp will receive incorrect reference data. (Global time is reset when the central electronic module (CEM) is replaced.) Reset the service reminder indicator (SRI). See: Resetting the service reminder indicator (SRI) Service and Repair.
Check that the CAN-communication is functioning. This is done by reading off the control module ID for the central electronic module (CEM), rear electronic module (REM) and engine control module (ECM) via VIDA vehicle communication.

Other information
For the location of other relay and fuse boxes, see: Relays, fuse boxes and wiring Locations.