You wired the illumination wire (Green) to a ground. The 86120 expects a positive pulse to dim. Disconnect the green wire entirely. The radio will work fine; you just won't have dimming.
The head unit series, often manufactured by Fujitsu Ten , typically utilizes a standard Toyota dual-connector system (a 10-pin and a 6-pin plug) for basic power and speaker functions. While specific diagrams can vary slightly by vehicle model—such as the Auris or Corolla—the core pinouts for these Fujitsu Ten units remain remarkably consistent across different Toyota generations. Standard 10-Pin Power & Front Speaker Connector manual toyota fujitsu ten 86120 wiring diagram
High-level schematics for the 86120 series can be downloaded from Elektrotanya . You wired the illumination wire (Green) to a ground
Common on 86120-33250 units and Corollas. often manufactured by Fujitsu Ten