Pioneer base headunit T1819 28pin connector pinout? - Scion tC Forums
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#1 (permalink) Old 11-18-2011, 09:08 AM
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Default Pioneer base headunit T1819 28pin connector pinout?

I try to install a Scion Pioneer base headunit T1819 (PT546-00120) into my Toyota Hilux Pickup. What I need is the pinout of the 28pin connector for steering wheel controls, AUX IN, MIC IN and speed signal in. I think SCION uses an adapter harness (PT546-00120-CH) to convert the 28pin connector to the standard 20pin and 8pin microphone connector. I allready have the pinout for the 20pin connector, the 8pin connector (not 100% sure) and the connectors to made my own wiring harness.

@anyone who has the T1819 radio
Can you publish (or send me) some photos of the adapter harness so I can figure out the wiring? Or can you draw a schematic or table with the pinouts?

Thank you very much
Patrick


T1819 radio connectors:
10pin connector:
1 -> front right +
2 -> front left +
3 -> ACC ignition +12V
4 -> battery +12V
5 -> front right -
6 -> front left -
7 -> ground
8 -> (antenna amplifier + output) now on antenna connector, you have to splice in here
9 -> amplifier control + output
10 -> illumination + input

6pin connector:
1 -> rear right +
2 -> rear left +
3 -> rear right -
4 -> telefone mute input, connect to ground to mute radio
5 -> illumination - input, connect to ground if not connected to rheostat (instument illumination dimmer)
6 -> rear left -

12pin connector CD changer, SAT, ...:
1 -> audio signal shield (ground) for pin2+3+4+5
2 -> audio R+ in
3 -> audio R- in
4 -> audio L+ in
5 -> audio L- in
6 -> mute in
7 -> ground
8 -> not used, unknown
9 -> AVC-LAN TX+
10 -> AVC-LAN TX-
11 -> ACC ignition +12V (I think it is an output, not 100% sure)
12 -> battery +12V (I think it is an output, not 100% sure)

USB connector:
-> on T1814 and T1815 it is a JAE MX39004NQ1 connector (USB type A receptacle style)
-> you have to use a Toyota factory cable assembly or solder an USB cable directly on the connector pins
-> on T1819, I think it is a JAE MX39006NQ1 (not sure) connector (USB type B plug style)
-> factory cable will not fit, use PT546-00120-US or solder an USB cable directly on the connector pins, don't have another Toyota part number

Antenna connector:
-> new style (similar to FAKRA connectors), dual antenna input, antenna amplifier + output (splice in 10pin connector pin8 or use adapter harness PT546-00120-AD)

28pin connector, replaces 20pin + 8pin connector on T1819:
1...28 -> to be figured out

2 RCA connectors:
-> pre-amp output for subwoofer, monoaural, L+R have the same signal, no fader/balance, master volume works, subwoofer level adjustable

Vehicle harness connectors:
20pin steering wheel controls, speed signal, AUX IN connector:
1 -> not used
2 -> not used
3 -> SPD, speed signal in
4 -> not used
5 -> not used
6 -> SWG, steering wheel controls ground
7 -> SW1, steering wheeel controls switched resistors input 1
8 -> SW1, steering wheeel controls switched resistors input 2
9 -> TX1+ to multi display TX2+, wire twisted with pin 10 wire, I think this is not used
10 -> TX1- to multi display TX2-, wire twisted with pin 9 wire, I think this is not used
11 -> not used, control for factory external audio amplifier
12 -> not used, control for factory external audio amplifier
13 -> not used, shield for pin 11+12, control for factory external audio amplifier
14 -> not used any more, AGND for older SCION headunits
15 -> ARI, AUX R+ IN
16 -> ASGN, AUX RL- ground
17 -> ALI, AUX L+ IN
18 -> AGND, audio shield (ground) for pin 15+16+17
19 -> AUXI, jack pluged in 2,7kOhms to AGND (AUX IN enabled) <-> jack not pluged in 15kOhms to AGND (AUX IN disabled), use a 3,5mm stereo jack with build in switch and series resistor 3.3kOhms and parallel resistor 15kOhms)
20 -> used, but don't know what it is

8pin 3.5mm Stereo Jack connector - old SCION headunits w/o USB:
1 -> ALO, AUX L+ OUT
2 -> ARO, AUX R+ OUT
3 -> ASGN, AUX RL- ground
4 -> AUXO, jack pluged in 2,7kOhms to AGND (AUX IN enabled) <-> jack not pluged in 15kOhms to AGND (AUX IN disabled), use a 3,5mm stereo jack with build in switch and series resistor 3.3kOhms and parallel resistor 15kOhms)
5 -> AGND, audio shield (ground) for pin 1+2+3
6 -> not used
7 -> not used
8 -> not used

5pin 3.5mm Stereo Jack connector - new SCION headunits with USB:
1 -> AUXO, jack pluged in 2,7kOhms to AUXG (AUX IN enabled) <-> jack not pluged in 15kOhms to AUXG (AUX IN disabled), use a 3,5mm stereo jack with build in switch and series resistor 3.3kOhms and parallel resistor 15kOhms)
2 -> ASGN, AUX RL- ground
3 -> ARO, AUX R+ OUT
4 -> ALO, AUX L+ OUT
5 -> AUXG, audio shield (ground) for pin 2+3+4

8pin microphone connector (not sure about the pinout):
1 -> TSW-, connect to ground (6) to tell the radio that there is a mic
2 -> MIC+
3 -> MCVD (I think +12V output to power the mic amplifier)
4 -> not used
5 -> MIC-
6 -> audio shield (ground) for pin 2+5
7 -> not used
8 -> not used
hilux_hx is offline  
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#2 (permalink) Old 12-07-2011, 06:54 PM
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do you know if by any chance this stock sterio is compatable with the satellite kit from the 2008 xB2?
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#3 (permalink) Old 04-11-2012, 12:52 PM
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Did anyone ever figure out the pinout for the 28pin harness???
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#4 (permalink) Old 06-23-2014, 12:11 AM
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Look at the connector listed here:
AutoHarnessHouse

and the pinout posted here:
http://www.autoharnesshouse.com/1/pr...ges/7586-3.png

Is this the same 28-pin connector that we have?
RyanK is offline  
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