What do d+ and d- mean?
2 Answers
d+ is the manual upshift function for automatic transmission models, and d- is the manual downshift function for automatic transmission models. When an automatic transmission model is switched to manual mode, the driver can manually shift gears based on the vehicle's driving conditions, enhancing driving pleasure and improving safety in special road conditions. Relevant information about automatic transmission models is as follows: 1. The manual mode of automatic transmission models can be unused: It is perfectly fine not to use the manual mode of automatic transmission models, as it is optional. When used, the driver can manually shift gears to increase driving pleasure and improve the vehicle's ability to handle difficult road conditions. 2. Driving automatic transmission models is very convenient: Since these vehicles lack a clutch pedal, driving only requires the use of the D gear, with no need for other gears. Simply steering the vehicle is sufficient for driving.
I've been driving for over a decade, and D+ and D- mainly appear in a car's alternator system. D+ is the alternator's excitation terminal, acting like a small switch that provides current to the alternator for proper power generation; D- usually refers to the ground terminal, connected to the negative side of the battery, completing the electrical circuit. These two terminals are crucial—if D+ has poor contact or breaks, the alternator might stop charging, making the car hard to start and damaging the battery; a loose D- can cause poor grounding, leading to unstable voltage, flickering headlights, or AC failure. When I was younger, I once had a corroded D+ wire, causing the alternator to stop working and leaving me stranded on the road—a tough lesson. During regular maintenance, remember to check wiring harnesses for damage or looseness, keep them clean and rust-free, and don’t wait until problems arise. These small details add up and keep your car running smoothly.
