[StevenWilliams]

I was about to start installing the parking sensors. I thought it would be prudent to test the unit prior to installing. I finally managed to get the lead to the speaker into the boot and wire everything up pointing the sensors out of the open boot. (nothing in the way to cause the sensors to think I was near anything.

When I set the car into reverse I get a continious tone from the sounder unit. I have disconnected it and can hear ticking from each of the sensors so I'm assuming that the wiring to each one is working fully.

Anyone got any ideas what would cause the continious tone?