OK, here goes:
Main wiring harness of the alarm module:
RED\WHITE - not connected (200ma channel 2 validity output)
RED - ran a new 12v (fused) from battery wire post of fuse box under hood
BROWN - to red\black siren (+)
BLACK - to ground (bolt under dash used by factory for ground)
VIOLET - not connected ((+) door trigger input)
BLUE - not connected (trunk trigger input)
GREEN - to blue driver's door (-)trigger and blue\white pass. door (-)trigger diode isolated from each other, and from BCM
BLACK\WHITE - not connected ((-)200ma domelight output)
WHITE\BLUE - not connected ((-) activation input)
WHITE - not connected ((+\-) parking light output)
ORANGE - not connected (ground when armed)
5-pin harness:
BLACK\WHITE - to ground thru toggle switch (neutral safety input)
VIOLET\WHITE - to white wire in connector at coil (2v AC at idle) confirmed tach.
BROWN - to white wire at brake switch ((+12v when brake applied)
GRAY - not connected (hoodpin shutdown)
BLUE\WHITE - to 555L status input
6-pin harness:
None connected (car does not have factory alarm)
3-pin harness from 556u (Have programmed lock\unlock thru 556u to factory single-wire lock\unlock, and door locks work correctly)
Shock sensor is unplugged (to eliminate possible alarms for now)
Remote start relay wiring:
Ribbon harness from alarm unit plugged in.
Heavy-gauge wiring harness:
PURPLE - to starter side of YELLOW starter wire from ignition switch.
GREEN - to key side of YELLOW starter wire from ignition switch.
RED - to new 12v (fused) from (+)battery wire post of fuse box under hood
ORANGE - to ORANGE accessory wire from ignition switch
PINK\WHITE - to DARK GREEN ignition 2 wire from ignition switch
RED\WHITE - this wire loops from red 12v to another terminal connection - I cut the loop and used this wire for 12v+ to relay for BROWN accessory 2 wire from ignition switch. I tapped into the ORANGE accessory 1 wire to power the coil in the relay - when orange wire is powered, the BROWN accy 2 wire is powered thru the relay by the 12v from the RED\WHITE wire. When the relay is not powered (normal start) the BROWN accy 2 wire is powered by the ignition switch thru normally closed relay contacts. I tested the relay connections with my multimeter to be sure this is correct.
PINK - to PINK ignition 1 from ignition switch.
RED - to the same 12v (fused) from (+)battery wire post of fuse box under hood as the other RED wire.
Accessory harness of remote relay:
BLUE - not connected ( - status output)
ORANGE - not connected ( -200ma 2nd accessory output)
VIOLET - not connected ( -200ma starter output)
PINK - not connected ( -200ma 3rd ignition output)
555L wiring:
Cut yellow passlock wire from ignition switch (in 3-wire taped harness)
YELLOW - to YELLOW passlock wire - switch side
BLACK\YELLOW - to YELLOW passlock wire - BCM side
BLACK - tapped into BLACK passlock wire
BLUE - to BLUE\WHITE (-)status output from main 564T module
PINK - to PINK ignition 1 in factory harness
After checking and re-checking all my connections, I changed the BLUE input to the 555L from the R\S relay status output to the main 564T status output. The car still won't start with remote, but no longer goes into tamper mode. If I try to remote start, it will try three times, then fail, but I can immediately start the car with the key. I'm now convinced the problem is NOT the 555L, but don't know where to go from here. AND, the alarm icon on the remote still stays on all the time. As far as I know, there is no factory anti-theft device on the car, except for Passlock II. I had a 2000 MC, that , if I locked the doors with the driver's door open, then closed the door, would flash the lights and honk the horn if I opened a door by reaching in through an open window and unlocking with the manual lock\unlock rocker switch (not the electric lock). This car does not do that. I'm really about ready to pull my few remaining hairs out! I really do appreciate all the input, it's caused me to really check my work, but I'm still stumped. If I could figure this one out, maybe I could help someone else to avoid a trap like this one. Thanks for all the help, I'll keep trying, and let you know if I get it.
I wasn't born in Texas, but I got here as fast as I could...