Unless I'm missing something, the wiring manual does not indicate that there is an illumination circuit running to ANY of the OEM head units -- I don't recall if my 6 speaker system ever lit up with the headlights or not. You can always check for an illumination wire with a meter. Look at the connector pin-outs below. Any wires that are on the unused pins are potential candidates for illumination. Otherwise, you'll need to tap into your lighting circuit elsewhere.
Yes, you need to power the antenna amplifier if you want to get reasonable reception. For my CarPC, I just tied the antenna amp to ACC. For the JBL system, the antenna amplifier lead is a black wire on pin 13 of the 20 pin connector R1. You can tell R1 from R5 (also 20 pins) by looking at the pin layout. R5 has a consistent pin spacing, R1 has consistent pin space except on the corner pins. The corner pin holes are larger.
Connector R1 - 20 pins
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01 Blue/Yellow BU+B Battery from 20A Radio No. 1 Fuse
02
03
04
05 Black TX+ Data Bus to Amplifier
06
07 White/Red MUTE signal to Amplifier
08 Black R+ (shielded) to Amplfier
09 Red R- (shielded) to Amplifier
10 Shield SGND for audio inputs to Amplifier
11 Gray +12V ACC+B through 7.5A ACC fuse
12
13 Black ANT+B Output
14
15 White TX- Data Bus to Amplifier
16
17
18 White L+ (shielded) to Amplifier
19 Green L- (shielded) to Amplifier
20 Brown GND
Connector R4 - 12 Pins
--------------------------------
01
02
03
04
05
06 Pink MUTE to rear audio controller
07
08
09 Red TX+ to rear audio controller
10 Green TX- to rear audio controller
11
12
Connector R5 - 20 pins
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01
02
03
04
05
06 White/Red GND to wheel controls
07 Violet/White SW1 to wheel controls
08 Yellow/Black SW2 to wheel controls
09
10
11
12
13
14 Shield SLD1 cable shield for audio connections to rear audio controller
15 Black RSR+ to rear audio controller
16 White RSR- to rear audio controller
17 Red RSL+ to rear audio controller
18 Green RSL- to rear audio controller
19 Violet RMU remote mute signal from rear audio controller
20