I'm not sure about the tC, but one of the xB owners in a local Scion club told me that's what he had to do change his out.
For the smaller (orange lights), you can get to the wire and bulb pretty easily, but I haven't checked to see if you can pull the whole thing out through the hole. He just took a quick glance at mine and was recommending something about putting in a white that has a "white" looking bulb but actually lights up orange. (Huh?)
Anyways, just from what he said, it seems like removing the bumper might be the only way. ;(
*Edit: OH yeah, I think imasaf's signature says something about special lights, so maybe she can help fill you in on what would need to be done?
For the smaller (orange lights), you can get to the wire and bulb pretty easily, but I haven't checked to see if you can pull the whole thing out through the hole. He just took a quick glance at mine and was recommending something about putting in a white that has a "white" looking bulb but actually lights up orange. (Huh?)
Anyways, just from what he said, it seems like removing the bumper might be the only way. ;(
*Edit: OH yeah, I think imasaf's signature says something about special lights, so maybe she can help fill you in on what would need to be done?