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In the 2001 Toyota Corolla, the radio fuse can be found in the fuse box in the engine compartment on the driver's side. Look for a diagram in the fuse junction box that indicates the fuse numbers. This diagram can be found inside the compartment or in the owner's manual. To check if the radio fuse is blown, you can use a diagnostic tool to scan the ECU for error codes. Also, inspect the wires and use a voltage tester to detect any short circuits that might cause voltage to reach the horn. Common reasons for the horn not working include a faulty connector, wire, or ground in the radio wiring harness. Make sure to thoroughly check these areas for any issues before replacing the fuse or installing a new radio unit. Follow the wires from the horn to the ground and inspect them for any damage.
The radio fuse for a 2001 Toyota Corolla can be found in the fuse junction box in the engine compartment on the driver's side.