Mercedes-Benz GLB250 horn intermittently fails, requires pressure on specific spots to activate on Mercedes-Benz GLB250

Some Mercedes-Benz GLB250 owners report experiencing intermittent horn issues that require pressure on specific spots to activate. This problem can make diagnosis challenging, as the fault may not be consistently reproducible. Some owners have found that turning the engine off and then back on without starting it can temporarily resolve the issue, but this may not be a permanent fix. Potential causes include faulty relays, which are common culprits for horn failure, and various electrical problems such as worn-out parts or damaged wires. Owners are advised to listen for unexpected horn activation and check for visible damage or loose connections. If a bad relay is identified, replacing it can often resolve the issue, along with repairing any damaged wiring. While some repairs can be handled as DIY projects, others may require professional assistance, especially if complex components like the driver side airbag need to be removed.