check Fuse F2.5(15a) CJB?
I am assuming the car was perhaps a rental car without the ability to turn on/off traction control. Therefore, without the TC switch it stays on all of the time.
Will not 110% positive, it would make sense that the TC delete option would remove ONLY the button. Therefore, all of the wiring harness and connectors should be in place. Therefore, finding a replacement TC switch should restore the driver's option to turn TC on/off.
An option is to remove the trim pieces between the radio and the shifter and look for the TC connector. The service manual has the TC switch (N462) going through connector C280. C280 has 6 wires.
I have never seen a car with the TC delete option. What is in the location where the TC switch would normally be?
It is also possible that fuse F2.5(15a) in the central junction box (CJB) has been removed.
Note, it will not work to simply install a jumper in place of the switch. It is a push button switch and if pushed on all of the time, the PCM will ignore it.