From the maintanence manual;
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Center Molding (Hatchback, S/Wagon)
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Removal Procedure
- Disconnect the negative battery cable.
- Pry off the center molding.
- Disconnect the mode control cable from the mode door.
- Disconnect the electrical connector.
- Remove the center molding
When it say pry off, my captiva had a couple of silver inserts either side of the radio- these needed to be pryed out- very carefully with plastic trim tools- I got mine from ebay. The panel is probably held in with little metal clips. Behind the panel, the rtadio is held in with 4 10mm bolts.Best of luck
Iain