S80 T6 Executive L6-2.8L Turbo VIN 90 B6284T (2001)
The rear electronic module (REM) is a separate unit in the relay box in the cargo compartment.
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Remove the integrated relay / fusebox. See Removing the integrated relay/fusebox in the cargo compartment.
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Unscrew the screw holding the connector so that it is free of its threads. Check that the screw is free using your fingers
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Disconnect the connector. Use an open spanner and a support. See the illustration.