New stereo head unit installed in 95 LS 400

[Mr. Innovator]

Hello to all LS 400 owners:I’m new to this forum so bear with me as I stumble through it.

I have just completed replacing my Lexus LS400 factory radio (non Nachamechi) with a newer double din pioneer head unit, everything is working great except the power antenna will not raise once the unit powers up. Pioneers website lists a dedicated ignition wire that triggers the antenna to raise the moment the ignition key is turned on ( which I had already done) I can hear the antenna motor activate but no action on the mast, thought maybe the internal plastic gear tape had stripped out inside the antenna...but it appears fine. Any suggestions on a fix?