Although I've checked the archives for antenna issues, I've not found one that matches the one I'm experiencing.

The power antenna was intermittent, at best. Sometimes it would go up (and down) just fine, other times only part way (in each direction). The mast and collar are fine. I've bench tested the unit out of the car with the same results applying the harness connecting the antenna to the car's wiring. When I bypassed the electronic control module and applied 12VDC DIRECTLY to the leads of the motor, the antenna would raise and lower fine, consistently. So I deduced that there was something wrong with the electronic control module. Maybe it was too current sensitive. [I assume that, since there are no limit switches on this mechanism, the only way the circuit would know that the antenna was either all the way up or down was by an increase in the locked rotor current of the antenna motor.]

So I ordered this over-priced, un-returnable, special order module from Volvo and guess what--no change. Same symptoms. So I thought, maybe there IS something wrong with the mast or collar. [There is no tail piece broken off in the gear housing. I checked.] I bought new mast. Still no change.

By now I've practically spent as much to fix this as a new antenna and am still reluctant to because I can see the mechanism can pull the antenna up or down if I bypass the module. I feel by replacing the whole darn thing, I'm throwing away a "perfectly" good antenna.

Anyone have experience in this kind of antenna situation?