Control module disconnection

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2006 Volvo S80, 2005 Volvo S80, 2004 Volvo S80, 2003 Volvo S80, and 2002 Volvo S80. However, it is still accessible from the selected car via links, so may be relevant.

Wait 3 minutes after turning off the ignition before unplugging the connectors from the Engine Control Module (ECM). The system relay must have released the voltage before the control module is removed from the vehicle. If the engine cooling fan runs after the ignition has been turned off, wait until it has stopped and then wait an additional 3 minutes.
Remove the engine control module (ECM). See: Engine control module (ECM), replacing
Fit the cover plate 9512974 over the hole in the air cleaner housing.
NOTE:
Ensure that the cover plate is properly sealed