mono

Recently the rear passenger turn signal on my 2004 scion Xa started to intermittently work. Now it just does not work, the bulb is fine.
I have limited electronics knowledge and tested the driver side bulb with a voltmeter and then the same contacts on the passenger side and the passenger side is not getting any power.
I have seen a few postings online with people describing the same problem but not a solution, so i figured some one on here might have come across this problem before.

jct

turn signal relay?

mono

Okay I took the car into a mechanic who I trust and he started showing me the wiring diagrams he had for my car and he could not find where the blinker relays were. All we could find between the battery and wiring harness was a switch. So I have read that the relays are above the fuses which I can see a small blue box, a bigger grey rectangle and then another small blue box. Which one is the relay for the passenger side? I was going to assume the right blue box for that side of the car and the left blue box is the relay for the other lights?

Are both blue boxes the same type of relays? Could I trouble shoot by problem by swapping them out and seeing if it fixes the one light on the right?