I have a (South African) Opel (Chev? Vauxhall?) Corsa bakkie (ute?). But I think this is more a general question than specific to this type of car. However, this model I own does not have many onboard computers etc - it is a really basic car - so I'm hoping the fix to this question is quite basic too.
When the ignition is switched on, the hooter/horn doesn't work very well. Pressing on the steering wheel only sometimes makes a proper sound. Other times it makes a very meek & mild "peep" sound as if it were dying. Most of the time pressing the wheel does absolutely nothing.
When the ignition is switched off, the hooter/horn works perfectly by pressing on the steering wheel. Every time. So that rules out the steering wheel switch, right?
Similarly, when I removed the steering wheel, I could get the horn to sound by just connecting the wires with a screwdriver when the car was off - doing this with the car on just did nothing.
As far as I know, the horn should not work when ignition is off, only when on.
To me it seems like the switch is wired up wrong, maybe to 2 live wires instead of a ground? But I don't really know much about how to track this down.
Is this enough info to get some advice on the issue?