Back up light switch
I believe this switch is part of the Park/neutral switch which is usually located on the transmission. Before spending lots of $$$$$ for this repair you might consider checking the wiring harness in the LEFT TRUNK area where it is attached to the LEFT TRUNK HINGE. Carefully open the harness and check for broken wires.
Search Toyota Camry Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Toyota Camry Experts