Have you checked to see it’s not something obvious like a fuse blown? If you remove the plastic boot trim from that side, you’ll see the motor and antenna. While I’m sure that a Honda replacement may cost a bit, there are universal aftermarket power antennas, that connect up to the same wires, that are available from car accessory places, or car audio places.
Have a look with a test lamp or similar at the wires to the motor in the boot – it should have power positive and negative (ground – probably a black wire) connections, and another one from the radio to switch it on. The wire from the radio will most likely have nothing when the radio is switched off, and a positive voltage to tell the antenna to go up when the radio is switched on. If the positive is missing – either the switch on voltage, or the positive supply voltage, suspect a fuse, faulty or disconnected plug/socket or a faulty relay, if there is one. The other thing it could be is a jammed antenna, due to a slightly bent mast. Download the Honda Civic workshop manual from the internet, and you’ll see if anything else is involved – there may also be a relay somewhere. I installed a fully automatic power antenna in an Alfa I used to own some time ago, that had an antenna at the rear – I bought one at a local car radio specialist shop/workshop, and put it in myself when I upgraded the sound system.
Don
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