It sounds like your fears are correct.
There should be a electrical connector on the top of the differential housing for the wires to connect to. If there is no connector then you do NOT have an e-locker.
The best bet for you would be to drain the oil and pull the rear differential cover and see what type and gear ratio you actually have.
It needs to match the gear ratio of the front differential also.
Check your door code.
The door code of CC29 is 2.94 and the code of CC33 is 3.36
There should be a electrical connector on the top of the differential housing for the wires to connect to. If there is no connector then you do NOT have an e-locker.
The best bet for you would be to drain the oil and pull the rear differential cover and see what type and gear ratio you actually have.
It needs to match the gear ratio of the front differential also.
Check your door code.
The door code of CC29 is 2.94 and the code of CC33 is 3.36