viper 350hv shock sensor

I have a Viper 350hv installed in my scion xb.  I am having problems with the lack of sensitivity.  The module is set at max.  I would have to knock on my car pretty hard for it to give out a warning chirp.  Any suggestions on what to do?

The brain is mounted on a wire harness under and behind the dash.  Should I switch it over to a metal mount?  Should I tighten the mount on the wire harness?

Hope someone can help!

If anything you should losen the mounting of the alarm unit, if it still isn't sensitive enough then you may want to add an external shock sensor, or maybe even a proximity sensor, I have installed a ton of the Viper 350hv alarm systems and noticed this is a common problem.

I also have installed 350hv's by the tons, never had any significant problems with the shock sensor, mounting the unit is the key!

Wire harnesses aren't the only places, however if you use a harness use a fairly large one, i find plastic ducts high up in the dash area make great monting places for sensitivity, i have this same system in my car (yes guys i know y'all will say what, an installer with such a basic entry system, it's because i don't like too much fancy addons and all that i like too keep it simple,  and it's just a daily driver from work to home)  anyway the unit is mounted on a duct that runs behind the instrument cluster but it's located closer to the centre of the vehicle, and it's adjusted absolutely perfect, I get coverage of all four windows and the rear and front windshied, warn away and full trigger,  if you could find surface area large enough as that brain is fairly small, screw it to the air duct it works for me!

t&t if i stuck my head under the dash, would i ever find the brain? ahah

most installers when doing it for their own car will go to extreme measures and make it stealth like no other.

i thoguht you wouldhave had a 2way at least.