Yes. In fact, the fact that the antenna still goes up and down is a clue that the motor is probably working normally, and the issue is that the replacement procedure assumes you can command the power antenna independently from the radio. With the Sony CarPlay unit, that "ANT" function may no longer be available. [clublexus.com] On most Lexus/Toyota power antennas, the mast is removed by: Unscrewing the chrome retaining nut at the fender. Extending the antenna fully. Running the antenna motor so it retracts. Pulling the old mast and nylon drive cable out as the motor retracts. If the radio has been replaced, you can often accomplish Step 3 by turning the radio on and off, switching sources, or temporarily applying power to the antenna control lead from the aftermarket head unit. The goal is simply to make the antenna motor retract while you gently guide the mast. The SC430 mast includes a nylon drive cable that feeds into the motor assembly. [lexuspartsnow.com], [parts.lexus.com] A few cautions: Do not force the threaded mast out with steady pulling. If the nylon cable is still engaged in the drive gear, excessive force can strip or break it. If the mast will not pull out while the motor is actively retracting, it is likely still captured by the gear mechanism. If a previous mast failure left pieces of nylon cable inside the drum, the motor may continue moving the antenna yet refuse to release the cable. In that situation, opening the motor housing is often required. SC430 service information includes procedures for accessing and removing the antenna assembly when necessary. [clublexus.com], [clublexus.com] Since you said the antenna goes up and down normally but the threaded portion won't pull free, my suspicion is that the cable is still engaged and you're trying to extract it without the motor driving the release cycle. I would stop pulling before it snaps. Can you tell me: Is this an OEM-style replacement mast with the long white nylon cable attached, or just the metal mast? When you remove the chrome retaining nut, can the mast move up and down freely, or does it feel mechanically locked? That will narrow down whether you're dealing with a release-procedure issue or a jammed/broken cable inside the motor housing.