Central Electronic Module (CEM), Replacing
Central electrical unit, fusebox
Central electronic module (CEM), replacing
Exposing and removing relay box in passenger compartment
CAUTION: The customer-programmed data must be read off before the control module is replaced. The information must then be entered into the new control module after it has been installed. This is performed via VIDA vehicle communication.
NOTE:
- Applies to vehicles -2003, All ignition keys are needed when programming a new control module.
- For vehicles equipped with Volvo On Call (see phone's keypad) the battery's minus lead shall be removed first. Otherwise the automatic alarm for emergency services may be triggered.
- The driver information module (DIM) must not be replaced at the same time. This would erase the mileage.
Removing soundproofing panel on driver's side
The central electronic module (CEM) is located as a separate unit in the relay box.
- Loosen the screws, 2 pcs.
HINT: The soundproofing panel is located in grooves by the pedal box.
- Pull the soundproofing panel straight down by the instrument panel.
- Pull back the soundproofing panel.
- Lift out the soundproofing panel.
- Remove the side panel for the fuses on the dashboard's left side (a part of the console is visible).
Removing relay box
- Insert a screwdriver up between the bracket and the relay box. Turn the screwdriver so that the bracket expands and, at the same time, pull the relay box from the bracket towards the underside of the dashboard.
- Lift away the relay box from the bracket and pull it downward under the dashboard.
Replacing relay/shunt
- Expose the relay box for better access.
- Replace relay/shunt.
Relay position
For position of relays, see:
1. Wiring diagram for model year in question
2. Decals by respective relay and fuse box in the vehicle
3. Pocket Data book
4. Driver's manual
Installing the relay box in the passenger compartment
- Install the relay box on the bracket
- Press the relay box forward so that the catches engage in the bracket and "click".
- Install the soundproofing panel on the driver's side.
Removing the control module
Preparations
CAUTION: The customer-programmed data must be read off before the control module is replaced. The information must then be entered into the new control module after it has been installed. This is performed via VIDA vehicle communication.
NOTE:
- The driver information module (DIM) must not be replaced at the same time. This would erase the mileage.
- Before disconnecting the control module's connector, remove fuses 11C/32, 11C/25 and 11C/21.
Removing the connector and the cover
- Slacken off the screw holding the connector so that it releases from the threads. Check that the screw is free with your fingers.
NOTE: Do not damage the terminal pins.
- Use pliers to disconnect the connector. Grip the screw and pull it straight outwards so that the connector and cover follow.
- Remove all relays and shunts bridged to the control module. Note the locations.
- Release the catch on the rear. Use a screwdriver
- Lift and pull out the control module.
Check that the control module connector is intact.
Installing the control module
- Press the control module into place so that the catch on the rear engages
- Position the connector. Carefully press the connector down.
NOTE: The pins are fragile. Check that the connector goes straight down into the control module.
- Tighten the screw for the connector
- Check that the connector cover is correctly positioned. Remedy if necessary.
- Install relays and shunts.
- Install the relay box.
- Install the soundproofing panel on the driver's side.
Ordering and programming software
Order and program software following below.
S60 8645433
V702000-, V70 XC 2001-/XC70 9494722
S80 9438273
XC90 8691290
Finishing
- 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) according to Resetting the service reminder indicator (SRI)
- Check that the control area network (CAN) 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.