While "Yapoo" is likely a transliteration variation or a specific brand labeling for certain markets (often associated with manufacturers like Shanghai Yaming or other automotive lighting specialists in China), the part number corresponds to a standardized piece of automotive electronics.

Another thought: UPD could be a specific model, not just an update. Maybe "Yapoo YMDD109" is the model and "UPD" is another part. But that's unclear. To avoid confusion, perhaps clarify that the model number might have a typo and proceed with a generic approach.

From surviving product listings (e.g., from Mandarake, Yahoo Auctions JP, or archived hobby blogs):