@
Nervo19
@
4runnerDebbie
@
Megahoser
I had the same problem (radio worked well, but no lights came on) with my T4R when I bought it about 2 years ago. I ended up replacing mine, but determined the wiring harness in the back of the radio (from the amplifier) wasn't making a clean connection. When I jiggled the connector, the lights would flicker on/off.
Hoping the attached pictures (wiring diagrams from 2002 T4R) come through and help out. If not, let me know if there's something else I can do to help.