1.Using 2nd hang factory unit, I see more connectors in it than tape/radio unit. where can I found 05 GS300 radio wiring and power amp wiring?
2.Using made in China Android set can't find suitable covers
3.Using brand set not sure model #. any suggestion?
4.Found 05 GS300 base has factory subwoofer at the back seat, who knows its wiring and how to drive it as above Android set has only 4CH power output.
thanks.

 

Update: three challenges,
1. Want to remove gear wood trim, so I can put back ashtray first then headset, I might be able to tighten its bottom bolt from sides, or else ashtray needs to cut off 3/16" due to new headset is taller. Suggestion?

2. Wiring to trunk cover, not sure how to get wires into hinge channel


3. Subwoofer driver, read discussion in this forum - long but no solid solution.

Update: above way is wrong, back up wires go driver side to trunk cover as factory wires do.

 

I get it done. No additional Dash kit used. Back up camera goes driver side with existing back up light wires, RCA cable length is just enough.
It seems that the audio line output level not changed with volume control, so I wired FR+/FL+ with attenuation to factory amp, the amp is used for sw only now.
for 2GS GS300 the 9" LCD is allmost perfect except that ash box a bit taller now - see picture not figured out the way to put it back.
GPS: IGo pre-installed, I downloaded google map also. Apple/Android phone can be connected via blue tooth, I've not tried. USBs left in glove box to play media files.
Factory has two radio antenna, I use one that fit radio jack. Not sure whether I can use two antenna to improve the signal quality. Not sure whether the car has factory ant amp and how to wire it. FM now might have more noise. Pls let me know if you can help.

2005 GS300 with ZHNN 9" Android radio

 

Now I use smaller antenna it seems better. the set has no AM.
Installed Agama app as home page, best! borrow a picture below. just tap or hold a button to customize it.