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The shock sensor is what triggers the alarm when it detects a blow to your vehicle. It is located over the right rear wheelhouse near the spare tire in the hatch area. There are two levels of alarms via the shock sensor. Two horn blasts and parking lamp flashes for non -threatening blows to the vehicle and a full two -minute alarm for harder blows to the vehicle. Its sensitivity can be adjusted if more or less sensitivity is desired. If sensitivity is increased too much, it may give false alarms caused by gusts of wind or other natural events that may shake the vehicle. To adjust, remove the label covering the adjustment **** and adjust as desired. Turn the **** clockwise to increase sensitivity and counterclockwise to decrease sensitivity. The shock sensor is ignored by the alarm system when the ignition is on, when the hatch is open, when the alarm is disarmed, when customized to be ignored and for five seconds after the horn sounds an alarm or chirp. The shock sensor is ignored after triggering three full alarms until the system is rearmed.
There are two knock sensors located on top of the Engine, approximately in the middle of the 4 cylinders at each bank. To get access to the sensors the black plastic engine cover with the "Jaguar V8" imprinted on has to be removed.
There are two types of knock sensors. The "old" ones that are of a "screw-in barrel type" and the newer ones that are just bolted on.
I describe the replacement of the bolt-on type knock sensor on Bank 2 in the following documentation on a 1999 XJ8 AJ27 engine.
Be careful! Knock sensors are piezo electric devices that are very sensitive! If dropped, over-torqued or struck they will probably be destroyed. As knock sensors are sensitive to a sudden temperature change they are also easily fractured by steam blasting a hot engine. So handle the knock sensors with great care and let the engine always cool before fitting a new sensor!
WATCH THE SENSOR LIGHTS TO SEE IF THEY GO OFF JUST BEFORE THE DOOR CLOSES. IF THIS IS THE PROBLEM EITHER ADJUST THE TRACK OR MOUNT THE SENSORS TO THE WALL INSTEAD.
IF THE SENSORS STAY LIT AND THE DOOR STILL REVERSES AFTER LUBE. ADJUST THE DOWN SENSITIVITY ABOUT 1/8 TURN AT A TIME (LESS SENSITIVE) ID YOU HAVE TO ADJUST THE SENSITIVITY MORE THAN 3/4 YOU WILL NEED TO CALL A PRO OUT TO CHECK THE PROBLEM.
I had the same problem with my GN9125 headset and GN1000 remote answerer (lifter arm). There is a knob at the top end of the lifter arm contraption that adjusts "Ring Sensor Sensitivity" (yeah, NOT a very intuitive phrase!) - You have to twist the knob in the direction of the arrow to "increase the sensitivity". Twist it slowly while the phone is ringing and eventually you'll start hearing the ring in the headset. You can see diagrams in the GN1000 manual, which you can find online by googling.
I had the same problem with my GN9125 headset and GN1000 remote answerer (lifter
arm). There is a knob at the top end of the lifter arm contraption that
adjusts "Ring Sensor Sensitivity" (yeah, NOT a very intuitive phrase!) -
You have to twist the knob in the direction of the arrow to "increase
the sensitivity". Twist it slowly while the phone is ringing and
eventually you'll start hearing the ring in the headset. You can see
diagrams in the GN1000 manual, which you can find online by googling.
Adjusting the Shock Sensor Sensitivity
To adjust the shock sensor, disarm the system, press and hold Button #3 (Finder) until the alarm chirps four times
(approximately five seconds), immediately release the button. Tap your vehicle’s hood above the alarm at the sensitivity
level you wish. The harder you hit the car the less sensitivity the alarm will be. The alarm will then chirp three
times. The shock sensor is now set at this sensitivity. Any shock that is equal to, or greater than this sensitivity,
will sound the alarm. Set the sensitivity as often as you wish; however, the sensitivity level will remain set until
the battery is disconnected or you reset it. If you do not tap the car it will automatically go to maximum sensitivity.
This setting is only acceptable if the car is parked inside a garage. NOTE: The factory setting on the shock sensor
should be acceptable for most vehicles.
Locate the shock sensor. Using a small screwdriver you can adjust the sensitivity of the sensor. Move srew in only 1/4 turns as this will make big adjustments. Adjustments may make alarm too sensitive so try it out and see what works for you.
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