17
VISION 1480 INSTALL GUIDE
ADJUSTING THE SHOCK SENSOR
The shock sensor is factory preset to work well with
most vehicles out-of-the-box (50% setting). Howev-
er, if you find that the siren is going off too easily, or
if the siren doesn’t go off when you think it should,
it’s time to adjust the sensitivity.
Turn the sensitivity adjustment knob clockwise to
increase
sensitivity and
counter-clockwise to
decrease
. If you cannot find a suitable adjustment
level, consider remounting the shock sensor.
Sensitivity
The VISION 318-052 Active-IR shock sensor has been engineered to avoid
false triggers in most situations. However, there is still the possibility
the sensor could trigger the siren during a strong earthquake, jackham-
mer operation adjacent to the vehicle, hurricane/typhoon, large explosions/
fireworks, large animals ramming against the vehicle, etc. If any of these
extreme cases are anticipated, you can avoid false siren triggers simply
by Arming the system with the Sensor Bypass Arming, which ignores the
shock sensor
(see page 3 of the Owner’s Guide).
Another consideration is temperature. The sensitivity can vary by as much
as 20% under extreme temperature conditions. You may wish to
reduce
the
sensitivity in
very hot
weather and
increase
sensitivity in
very cold
weather.
False Alarms
If the shock sensor is not working well or at all, it may be that the suspend-
ed element inside the case was jolted out of position. Disconnect the wire
harness, snap open the shock sensor case, and adjust as shown below.
Suspended Reflector Malfunction
Full Trigger
RED LED
Warning Trigger
GREEN LED
Sensitivity
Adjustment
VISION
IR SHOCK SENSOR
SENSITIVITY
ADJUST
TUNG
25 v
TUNG
TUNG
25v
25v
504
R5
R3
R8
Q2
C10
D7
C12
318 REV1
052
C5
C6
R19
R13
C3
C9
R2
R4
LM324
41C8
31N
25 v
TUNG
TUNG
TUNG
25v
25v
25v
504
R5
R3
R8
Q2
C10
D7
C12
318 REV1
052
C5
C6
R19
C4
R13
C3
C9
R2
R4
LM324
41C8
31N
R18
TUNG
25 v
TUNG
TUNG
25v
25v
504
R5
R3
R8
Q2
C10
D7
C12
318 REV1
052
C5
C6
R19
R13
C3
C9
R2
R4
LM324
41C8
31N
R18
Incorrect Alignment
Correct Alignment