[HardBoiledEggs]

Reposting this to the main thread so this gets some more attention sorry for the spam

I have some updates regarding the new head unit and its wiring and need some help determining the correct wiring for the new head unit. I attached some pictures of the new wiring diagram and unfortunately it will not be color for color but when look at the diagram 1fstgts linked and the pictures of the wiring harness I became very confused on the speaker wires.


For the power:

• Match Constant 12V (Gray) from the car to Yellow from the new head unit.
• Match Accessory/Ignition 12V (Blue with yellow stripe) from the car to Red from the new head unit.
• Then black from both plugs go to ground?

The speakers:

• Match Front left speaker + (Green) to White from the new head unit.
• Match Front left speaker - (Green w/ stripe???) to White/Black stripe from the new head unit.

• Match Front right speaker + (Purple) to Gray from the new head unit.
• Match Front right speaker - (Purple w/ stripe???) to Gray/Black stripe from the new head unit.

• Match Rear left speaker + (Black/Yellow) to Green from the new head unit.
• Match Rear left speaker - (Black/Yellow w/ stripe???) to Green/Black stripe from the new head unit.

• Match Rear right speaker + (Red/Blue) to Purple from the new head unit.
• Match Rear right speaker - (Red/Blue w/ stripe???) to Purple/Black stripe from the new head unit.

Also should I attach anything to the Illumination wire? There is a switch in the car that allows me to dim the dash. Also the power antenna should I attach that to something or will that be handled through the radio plug? Everything else Ill just tape up and leave blank. Also the head unit is a Boss BVCP9700A head unit.

 

[93celicaconv]

So what are you looking to do now?

It appears your original radio has a 9-pin connector and a 5-pin connector. I’m thinking the radio you got from eBay uses a 10-pin connector and a 6-pin connector. Is this correct?

So do you want a set of connectors with pigtails to splice into your wiring to give you an ability to use the radio you bought? Or do you want to find a radio that has the same connectors that your original radio has, to use your existing wiring?

I think it was stated before that your existing wiring connectors had 3 sources of power: one being a constant 12VDC source to maintain presets, one switched 12VDC power source for primary power for the amplifier & speakers, and one illumination power source that goes through your interior dash lighting that comes on when the light switch is used to provide dimmable illumination to the radio. Have you verified that all three sources of power are present in your current wiring system connectors? I’m thinking you did, but not sure at the moment.

I’m tied up and away this week and part of next week and don’t have access to my sources of information now. I can generalize but I can’t look up information while away from my sources.

 

[HardBoiledEggs]

I am looking to splice the current wiring harness into the new cable that came with the radio. I am just looking to confirm what wires are what.

I’m pretty sure there were only two power sources. One 12v constant and one ACC power. One in the 10 plug connector and one the 6 plug connector. I verified these two but I did not look for the illumination wire which I can probably find. Seeing that it wasn't present in the schematic I kinda forgot about it. Worst case scenario I can just use my volt meter to test continuity to each speaker.

This new head unit will combine both plugs into the one plug. I was having some trouble with matching the colors displayed in the schematic (ex. front right speakers wire colors) then splice those to the cable provided in with the head unit. Which would be the white and white / black

I attached a picture of the wiring harness that came with the head unit.

 

[HardBoiledEggs]

So what are you looking to do now?

It appears your original radio has a 9-pin connector and a 5-pin connector. I’m thinking the radio you got from eBay uses a 10-pin connector and a 6-pin connector. Is this correct?

So do you want a set of connectors with pigtails to splice into your wiring to give you an ability to use the radio you bought? Or do you want to find a radio that has the same connectors that your original radio has, to use your existing wiring?

I think it was stated before that your existing wiring connectors had 3 sources of power: one being a constant 12VDC source to maintain presets, one switched 12VDC power source for primary power for the amplifier & speakers, and one illumination power source that goes through your interior dash lighting that comes on when the light switch is used to provide dimmable illumination to the radio. Have you verified that all three sources of power are present in your current wiring system connectors? I’m thinking you did, but not sure at the moment.

I’m tied up and away this week and part of next week and don’t have access to my sources of information now. I can generalize but I can’t look up information while away from my sources.

 

[93celicaconv]

You photo 8727 in post #6 of your radio wiring schematic shows you the input power & output speaker & other connections with the wire colors. 1fstgts in post #13 provides essentially the same information, but also includes original wire PIN numbers at the connectors. Only the green illumination wire is absent from these schematics. Your new radio shows where the power wires and the output wires are also, with the new radio wire colors. You simply connect the new radio connector wire colors that have the same output to the old wires feeding that same output. Pick something like the front left positive speaker wire. Look at what the old and the new wire colors are for that item. Then connect the new radio pigtail wire to the old wiring harness for the colors that tie to that front left positive speaker wire. Do the same for all other connections.

 

[HardBoiledEggs]

You photo 8727 in post #6 of your radio wiring schematic shows you the input power & output speaker & other connections with the wire colors. 1fstgts in post #13 provides essentially the same information, but also includes original wire PIN numbers at the connectors. Only the green illumination wire is absent from these schematics. Your new radio shows where the power wires and the output wires are also, with the new radio wire colors. You simply connect the new radio connector wire colors that have the same output to the old wires feeding that same output. Pick something like the front left positive speaker wire. Look at what the old and the new wire colors are for that item. Then connect the new radio pigtail wire to the old wiring harness for the colors that tie to that front left positive speaker wire. Do the same for all other connections.

Update I have all the speakers wire up now and they work!
The radio works but the power antenna isn't going up. I still have some wires leftover because I don't understand what to splice them to. The black with red stripe (plug B) and pink with a blue stripe (plug b). The two wires leaving the radio on the diagram. I understand that one probably power antenna but that still leaves one left over. I know you mentioned that green is the only wire unaccounted for. The new head unit diagram mentioned a green wire the parking break wire? Those last three wire are giving me a little bit of trouble so I thought id ask.

Should they both be spliced together and then to the power antenna wire?


sorry for all the questions. Thank you for helping me again.

 

[93celicaconv]

I can’t dig into this until early next week. If you haven’t resolved before then, I will dig into it for you.

 

[93celicaconv]

Not sure how your speaker wiring is working properly. Regardless, I decided to spend some time manually reviewing your previous 1986 manual wiring diagram for the original radio, and then matching which wires connect to the original car wires for your new head unit. The table below is what I get. If your wiring doesn't match this table, then I don't exactly know how your speakers are working properly. The table also includes non-speaker wiring connections as well. Let me know if you have any further questions.