Sory cannot help you with the diagram. But I have some hints that will help you analyze the problem.
Each relay in the fuse box controls a set of load or equipment in your car. You can refer that in the fuse box block diagram. Each relay terminal is marked with number (say 85, 86, 87 ect.) if you refer this on the relay schematic diagram.If you suspect a load connected to a relay not functioning when you flip the sw., check the relay for that load (equipment). Remove the existing relay and replace with a good one. You don't need to buy a relay right away. Try it first with the other relay installed with the other load that is working normally. Make sure it is the same size of ralay you are replacing.
Some relays are connected to a fuse in the fuse box. But most relays are not because it carries only a fraction of current when energized. The one that controls the relay is the one that carries high surge of current when it is turn on at an instant, that is why a relay is used. For this, a fuse is provided to that load usually in the range of 20A and above. Relay load is isolated from the load it is controlling, say for example the radiator fan. A relay will still be on (contacts closed) even though the fan is inoperative, in this case the fans fuse is already blown out.
Always use a multimeter when checking for power and continuity.