Here is some information for the connectors listed on your site. This is from the 04 wiring manual. According to the manual, "not all of the part numbers of the connectors are established for the supply."
Label, Color, Pins, Toyota P/N (My own description of the connector)
Pin Color Signal-Name Description
R9 Gray 5 90980-11909 (Sensor signals)
1 Green PKB - Parking Break. This signal is grounded when parking break switch is closed. Floats otherwise.
3 Violet/Red SPD - Generated from the Speedometer. Most likely this is the Vehicle speed sensor pulse line.
5 Red/Yellow REV - Reverse Signal. This signal is tied to +12v when the Park/Neutral switch is closed.
R8 Black 10 90980-11923 (Video and Communications)
1 yellow VR - Connects to Nav ECU
2 Black R - Connects to Nav ECU
3 Red B - Connects to Nav ECU
5 Red TX+ - Multiplex communications bus + signal to Nav ECU
6 Shield around wires on pins 1,8,3,7,2 VG - Connects to Nav ECU
7 White G - Connects to Nav ECU
8 Green Sync - Connects to Nav ECU
10 Green TX- - Multiplex communications bus - signal to Nav ECU
R7 Blue 6 90980-12209 (DVD Changer Video)
3 Pink VAL+ - Connects to NTSC signal on DVD Automatic Changer
6 Light Blue ADPG - Connects to SGND on DVD Automatic Changer
5 Shield around wires on pins 3,6 VA- - Connects to SLD2 on DVD Automatic Changer
R6 White 4 90980-12211 (Reverse Camera Video and Power)
1 Black V+ - Connects to Television Camera (Probably composite video signal)
2 Red CA+ - Connects to Television Camera
3 Shield around wires on pins 1,2,4 V- - Connected to Television Camera (Video Ground)
4 White GND - Connects to Television Camera (Power Ground)
** There are no other connections to the camera so pin 2 is probably the power line.
R12 White 20 90980-12038 (Power, Audio Outputs)
11 Gray ACC - Accessory Switch - +12V when key is at ACC position
1 Light Blue on Yellow +B - Battery +12V
13 Black ANT - +12V Power to Antenna Amplifier
9 Red L+ - Left channel audio to audio amplifier
19 Green L- - Left channel audio to audio amplifier
8 Black R+ - Right channel audio to audio amplifier
18 White R- Right channel audio to audio amplifier
10 Shield around 9,19,8,18 SGND - Common ground for audio signals, connects to amplifier
5 Black TX+ - Multiplex communications + transmisison signal to Amplifier
15 White TX- Multiplex communications - transmission signal to Amplifier
7 White/Red MUTE - Mute signal to amplifier
R11 White 12 90980-12183 (Rear audio controller, DVD Changer Audio)
6 Pink Mute - Mute signal from rear audio controller
9 Red TX+ - Multiplex communications + signal to rear audio controller
10 Green TX- Multiplex communications - signal to rear audio controller
2 Black R+ - Right audio input lines from DVD changer
3 White R- ...
4 Red L+ Left ...
5 Green L- Left ...
1 Shield around 2,3,4,5 SLD - Shield connects to DVD Auto Changer
R10 White 20 90980-12259 (Rear Controller Audio, Steering wheel controls)
15 Black RSR+ - Audio signals to Rear audio controller
16 White RSR- - ...
17 Red RSL+ - ...
18 Green RSL- - ...
14 Shield SLD1 - Shied around audio signals to rear audio controller
19 Violet RMU - Mute signal to rear audio controller
7 Violet/White SW1 - Seek+/-, Vol+/- Inputs from Steering wheel audio controls
6 White/Red GND - Ground from Steering wheel audio controls
8 Yellow/Black SW2 - Mode input from Steering wheel audio controls
** The TX+/- Lines connect to the DVD changer through the rear seat audio controller. Either the controller passes control through from the head unit or the DVD changer can only be controlled from the rear seat.