Sounds like you might have an open circuit to the rear bulbs, but there are seperate circuits based off three connectors in the kick panel. The rear is on it's own circuit, mainly the 2 taillights and 2 inner trunk tails. There's a white/ black wire and green/white wire that are taped to the bumper and swing from the driver side to the passenger taillight. Make sure those two wires are in good condition because I found this is common problem and it was hanging down one day.Reviving this thread..
I just noticed this problem on my 2001 IS300.
Here's the problem, when i start the car and turn on the lights my headlights work, but no lights in the rear. Pressing down the brakes turns on the brake light but during normal driving my rear is completely unlit, taillights and license plate light.
I've noticed my license plate going out, can replacing these fix my problem?
Also, i removed my fog lights and zip tied the sockets to something that will prevent them from hanging. After noticing my taillight/license plate light not working and reading some threads here on MY.IS, i went back and taped all the sockets up so nothing is exposed.
Ive also replaced the 10Amp fuse in the driver side kick panel in the front seat. DIdnt help.
Thanks fellow isers.