Hello,
Sound like there might an issue inside your UEC, Under hood Electrical Center. These units are known to have water entry.
These can be stripped and inspected.
Get the technician to check if any wires are shorting to ground.
How to test wiring.
https://www.2carpros.com/articles/how-to-check-wiring
The radio, interior light and horn have three separate fuses.
The horn uses fuse four in the UEC.
The radio uses fuse three in the inside fuse box.
The interior light uses fuse nine in the inside fuse box.
Please see link below.
https://www.autogenius.info/vauxhall-tigra-2009-fuse-box-diagram/
Please let us know how you get along.
Cheers, Boris
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Friday, December 10th, 2021 AT 8:30 AM