The device seems healthy, yet the vehicle does not react: with this pattern the fault lies on the radio path or in the pairing. Three steps narrow the cause down reliably.
Rule out the radio path
Move close to the vehicle and ensure a clear line between transmitter and receiver unit. Metal bodies and containers attenuate the signal strongly, a few metres of offset often make the difference.
Check the receiver side
The receiver unit needs power from the vehicle: ignition, fuses and wiring should be checked. If a second, demonstrably working remote does not respond either, the fault is most likely on the vehicle and belongs in a specialist workshop.
Renew the pairing
After a reset or loss of power the coded link can be lost. Repeat the pairing procedure per the Meiller manual, it only takes a few minutes. If pairing fails repeatedly, the transmitter may no longer send a clean signal and should be checked.
Frequently asked questions
Everything worked yesterday, no connection today, what happened?
Typical triggers are batteries drained overnight, work on the vehicle electrics or a power loss of the receiver unit. Run through the three steps of the quick diagnosis.
How do I tell which side is at fault?
With the cross-test: try a second remote on the same vehicle and your remote on a second vehicle. Whatever stays constant in the failure is the faulty side.
The connection comes and goes, is that this pattern too?
An intermittent connection points more to weak batteries, interference or a loose contact. The quick diagnosis for shortened range fits that better.