I'd start troubleshooting using the instructions at http://www.camrystuff.com/manuals/Gen3/eg1.pdf starting at page 177 . Use an unbent paperclip instead of the SST they refer to to bridge the connections on the Data Link Connector (DLC). DLC1 is inside the engine bay, passenger side corner near the firewall. Just flip the cover open -- the position of the terminals are clearly labelled on the underside of the cover.
Oh, and the position of the circuit opening relay is shown in the same manual on page 169, but bridging using this jumper bypasses that relay.
Oh, and the position of the circuit opening relay is shown in the same manual on page 169, but bridging using this jumper bypasses that relay.