Possible cause of fault

Fuse D7 faulty
Relays faulty
Micro switch faulty
Short circuit to ground/open circuit in the wiring between instrument cluster and relay carrier or spoiler control
Spoiler drive faulty

NOTE:

The relays are in the rear area of the relay carrier. The spoiler is extended via relay no. 3. The spoiler is retracted via relay no. 9 (see wiring diagram)