A s/trac lights on plus code C1111?

The C1111 code in your 2011 Infiniti FX35 indicates a fault in the ABS system, specifically the ABS motor relay circuit. The S/trac lights being on could also be related to this issue. Here are some possible causes and solutions for this issue:

Faulty ABS motor relay: The ABS motor relay may be faulty and need to be replaced. A certified Infiniti technician can diagnose and replace any faulty relays.

Wiring or connection issues: There may be an issue with the wiring or connections to the ABS motor relay or the ABS control module. A certified Infiniti technician can diagnose and repair any wiring or connection issues.

Faulty ABS control module: If the ABS control module is faulty, it may need to be replaced. A certified Infiniti technician can diagnose and replace any faulty modules.