Does every automotive LED require a decoding question?

Not every car LED needs decoding.

1. Situations where decoding is not required

Direct-driven LEDs
Many cars have simple LED indicators, such as brake lights, turn signals, etc. These LEDs are usually directly connected to specific circuits of the car’s electrical system, and they work according to preset circuit logic. For example, when the brake pedal is pressed, the brake light circuit is turned on, and the current directly drives the brake light LED to light up, without the need for additional decoding.
The same is true for some LEDs that are only used to display basic status (such as power indicators). As long as the car power system provides the right voltage and current, the LED can work normally without decoding related signals.
LEDs in independent control modules
In some small independent electronic modules in cars, such as LED indicators on key sensing modules of some models. The functions of these LEDs are relatively simple, and their control signals are generated by simple logic circuits inside the module, which are not related to complex networks such as the car’s CANBUS or do not require decoding of complex signals from the outside.

2. Situations where decoding is required

LEDs connected to the CANBUS network
In the LED displays related to the intelligent lighting system or advanced driver assistance system (ADAS) of modern cars. For example, the LED indicator light in the car’s adaptive cruise control system needs to receive multiple signals from the CANBUS network, which contain information such as vehicle speed and following distance. These signals are encoded, and the LED control unit needs to decode the received CANBUS signal to accurately control the LED display status according to the instructions, such as on and off, flashing frequency, color change, etc.
Multi-function LED display
Some multi-function LED displays in the car are used to display various information of the vehicle, such as fault codes, multimedia information, etc. The data received by these displays is often encoded and needs to be decoded to correctly display the corresponding characters, icons and other information on the LED screen.