Replacing The Rear Electronic Module (Rem): Notes
The rear electronic module (REM) is a separate unit in the relay box in the cargo compartment.
CAUTION:
New software can only be ordered when the control module is installed in the car. VIDA (Volvo scan tool) reads off the new control module identity which is required to order the correct software.
Release the relay and fuse box. See EXPOSING THE INTEGRATED RELAY/FUSEBOX IN THE CARGO COMPARTMENT .