SOURCE: 1990 Toyota Coaster Bus
When a lamp illuminates and causes a different circuit lamp to illuminate it usually means a bad earth/ground.
Basically the lamp with the defective earth is getting it's earth connection through the other circuit and thus causing that lamp to illuminate.
Your first steps should be to check the stop light lamp holders for cleanliness and good contact and then the nearest earth/ground point for the stop lamps.
SOURCE: where can i get a
you will need to get a Japanese (english) manual.OR find a manual for the equivalent (different name)car (whats a "coaster" ,not available in Europe/Russia.........
This issue may be related to the Turbo Unit in your Vehicle.
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