How to Clear Fault Codes After Replacing a Car Battery?
2 Answers
If the fault is with the battery's charging controller, you should promptly visit the car's 4S store or a repair shop for servicing. If the navigation display doesn't light up after replacing the battery, first disconnect the negative terminal of the battery, wait for 20 seconds, then reconnect it, and turn on the navigation again.
I've encountered the situation where the warning light comes on after replacing the battery several times, mainly because the computer system temporarily goes haywire after power loss. My most common solution is to drive around for thirty to forty minutes, letting the car readjust itself—usually, a lap around the city roads does the trick. If that doesn't work, I loosen the battery's negative terminal, leave it for five to ten minutes, then tighten it back; after restarting, the light typically goes off. Remember to turn off the engine during the operation, wear insulated gloves to prevent electric shock, and avoid letting tools touch metal parts. For prevention, regularly maintain the battery terminals to prevent dust buildup, and take a photo of the connections before changing the battery to avoid mixing up the wires. If the light stays on and affects driving safety, pull over, check the dashboard for any other warnings—it's likely temporary, so no need to panic. Older cars are easier to deal with; just try a short trip.
