Where the heck is the tilt swich for this thing? The self-leveling rear air shocks in my '97 pontiac trans sport worked fine until about six months ago. Now, I can force the air pump to work and I can disable the bypass valve to cause the air to extend the rear shocks. But I would really like to find the "tilt" switch that triggers this and relays (if any) that might be involved....... my operator's manual doesn't seem to refer to this system at all. Can anyone help?