Why do several dashboard lights turn on after the car is powered on?
3 Answers
It is normal for several warning lights to illuminate on the dashboard after the car is powered on. This is part of the vehicle's self-check process, as the onboard computer performs diagnostics when power is connected. These warning lights will turn off after the self-check is completed. Typically, only the battery and handbrake indicators remain lit at this stage, with the battery light extinguishing once the engine starts running. There's no need for excessive concern. Below is an introduction regarding warning lights: 1. Location of warning indicators: Warning lights are generally located within the dashboard display in the driver's compartment. 2. Function of warning indicators: Their purpose is to alert the driver when a system malfunction occurs during normal vehicle operation, prompting attention and service at designated repair stations. 3. Types of warning indicators: These include the engine warning light, airbag system warning light, ABS system warning light, and transmission control system warning light. 4. Structural principle of warning indicators: Composed of bulbs, self-diagnostic systems, and fault circuits, they can promptly identify malfunctioning components when system failures occur, at which point the warning light will illuminate.
It's usually a normal self-check process when several lights on the dashboard illuminate after the car is powered on. Lights like the engine light and battery light will flash for a few seconds before starting to test if the system is working. I've been driving for years and see this phenomenon every time I insert the key. However, if the lights don't turn off after starting the engine, it might signal potential issues like sensor false alarms or loose fuses. Don't panic; first, check the manual to identify the type of light that's on, and simply clean the battery terminals. If the lights persist, have a technician use a diagnostic scanner to read the codes as soon as possible. Regular maintenance, such as replacing filters, can also prevent issues—don't let small problems escalate into major repairs.
Every time I get in the car and power on, the dashboard lights always make me nervous. As a new driver, I didn't understand why several lights would illuminate. Later, I learned it's the system performing self-checks on the battery, oil pressure, ABS, and other systems. Common lights like the yellow engine light or red warning lights should turn off after a normal startup. If they don't, it might indicate an aging battery or damp wiring harness—I once experienced lights not turning off on a rainy day. It's worth spending some time at the repair shop to check for voltage issues or corroded connectors. Remember to observe whether the lights turn off promptly after powering on, and address any issues promptly to ensure safety.
