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Nathan,
I was my msitake not to mention about both LED and the sensor. For ECC model, the plastic pyramid has both LED ans ECC sensor. The LED is an indicator (blinking slowly) as the aftermarket alarm system. Antenna is definitely not there. For MCC model, the plastic pyramid only contains LED. For car without Volvo alarm system, no plastic pyramid installed, just a flat tab. My car was without Volvo factory alarm, and I installed aftermarket alarm along with the plastic pyramid to replace the aftermarket LED. I have the 1995 part catalog, which show the Volvo alarm system including the antenna in the driver side key hole area. I am not sure about the later model.
Ching-Ho Cheng
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