Hiya,
Having a problem with my 96 960.. the remote has new batteries, but still doest work... it makes the little click noise and is only a year old... its not the alarm system becasue i can engage it with the key... im thinking its the sensor but i have no idea where that is located...
I also know its not the alarm relay block behind the radio, i changed it with one i got from the wreckers and still the same problem

 

If you have the Guard Alarm 11 the radio sensor is built in to the control module and uses the lead to terminal D1 as an antenna.