I recently changed out my dash & console for new units recently. The previous owner had installed a USA.SPEC BT35-TOY Bluetooth unit. It was working until I pulled the radio out. . .

Hiding behind the radio was an absolute botch-up of a wiring job on the 12pin / CD changer side of the USA.SPEC Bluetooth module to Radio cable. It was a sight to see ; several wires barely joined by hand-twists & the whole connector / radio interface covered by a golf-ball sized lump of silicon in an attempt to insulate the wires. Photo-1 shows the connector after I cut away all the silicon so I could separate it from the radio. Amazing the trouble people will go to because they can't be arsed spending another $25 for a P+P cable. . .

I had to cut away the silicon to separate the connector from the radio and some of the wiring predictably came apart. I attempted to re-connect the wires where I though they went but found the Bluetooth wasn't working and operation of CD track select / forward / back buttons was erratic.

I heard that Toyota label the terminals on the circuit board so I took the radio apart to find that only 2 terminals of the 12pin (CD changer) & 3 terminals on the 20 pin (Radio) connectors are labelled. < 12 pin: ACC+B, BU+B >. . . . So knowing my limitations I have just ordered a replacement Blue-Tooth module to CD changer cable so that issue is now sorted.

I still have a couple of questions I was hoping someone could help with though; apparently this radio connector format is common to quite a few 1998 - 2003 Toyota Vehicles.

< refer photo 5 >.

1. What is the cream coloured Single-pin connector wire for? It runs parallel to (and is dual cored with) the antenna wire.
2. Why would the Black wire (with thin diagonal silver stripe) originally running to 20 pin radio connector have been cut & joined with above wire.