Traduction de l’étape 1
This is what the front panel looks like, for the US model. The unit is manfactured by Clarion for Subaru. There is a China-specific model with different front panel buttons.
The top of the case shows the Clarion part number, PF-3391A-A. A web search for this part number will find the factory service manual available, although not from Clarion.