front speakers dead

[landgraf]

I recently bought a 2007 Yaris YR, front speakers are dead, I have checked the wiring out
of the radio with another speaker all outputs OK.
I suspect there is a bad connecting joiner somewhere other than near the radio.
Anybody any ideas where both front speakers connect into the wiring loom??
There must be a socket somewhere thats become disconnected for both speakers to be not working.
Have studied the wiring diagramme but not easy to follow.