Here are a couple of pics of the roof console. In the first, you can see the HomeLink module in the upper right hand quarter. In the second photo, you'll see a close-up shot of the power connector. None of the other connectors have only two wires. The ORN is of course the +12V and the BLK/WHT is ground.
According to what I have, you only need to remove the roof console. Instructions are:
Important: Do not let the overhead console hang from the flat wire harness.
1. Carefully pull down on the overhead console to release the four retainer clips.
2. Disconnect the electrical connector.
3. Remove the overhead console.
This should give you the access you need.
Installation should be the reverse.