85 Cressida, Crimestopper 2011RS IV

Yes, head unit = alarm CPU.

I'm using a digital multimeter.  The voltage at rest is 12+ volts.  When the "negative pulse" is set (programmable from .75 to 3 seconds) voltage drops to 1.5 volts.  I tried to measure contunity with ground testing the same unlock event and continuity never measurable. 

Welp, I proved the concept.  The relay works.

A tech note for the archives...

Old Toyotas (mid-late 80s) with factory power door locks REQUIRE a relay to deliver the ground signal.  They also require two ground pulses.  The pulses must be shorter than 3 seconds.

I got it to work by programming double pulses @ .75 seconds.  The Crimestopper unit only allows for .75 and 3 second pulses, so I can't give you the exact cut-off point.

Whew!  Everything works.  Now, I gotta put the whole thing in for real.

Any idea on how to pull A pillar trim to mount the antenna?