That is a test point.  Normally nothing should be connected there

Sorry don't recognize this one.

This one is for the rear washer pump.  Sedans and Wagons use the same
engine harness, this one is not used on the sedans.

gdg1/gdg4:
r/w wire grounds the constant idle motor (IAC) to cause it to go all the
way shut so that you can set the base idle at 750 rpm.
The g/w wire reads the output voltage sweep for the 02 sensor feedback
from the control unit for setting idle CO.  For LH cars the output
voltage sweep centered around 2.0 voltsDC with a clean and accurate MAF
sensor. The adjustment range ran from 0.01v-3.7v A good sweep would be
1.7-2.7v or so.

gdg2/gdg8:
The pink wire connects to the starter solenoid. You connect your remote
starter switch B+ there to spin the motor for adjusting valves, checking
compression, spinning belts on and off, or for whatever reason you need
to turn the motor effortlessly.
The Y/R wire is the test point for the EZK control unit. It will
generate a flash code of 1-4, IIRC, through a test LED. If you make one
with long enough leads to reach through the back of the hood opening so
that it can be positioned under a wiper you can observe control unit
detected faults while test driving the car. There is only volatile
memory in the control unit so that once the key is cycled off the
recorded fauts are lost.

gdgs/gdg6:
What Mike said.

Bob