What are the four wires of the brake light switch?

1 Answers
CassidyDella
07/25/25 6:09am
The four wires of the brake light switch are: one is the 12-volt power supply, one is the brake signal wire for the ABS system ECU (ECU is the electronic control unit, also called the onboard computer), one is the brake signal wire for the automatic transmission ECU, and one goes to the rear brake indicator light. Below is relevant information about the brake light: 1. Rear brake light: The rear brake light is controlled by the vehicle's lighting system. The brake switch does not directly control the rear brake light; instead, the brake switch signal first goes to the vehicle's lighting control system, which then controls the brake light. 2. Function: The brake light is bright and highly visible, primarily used to alert following vehicles that the car is slowing down or stopping. If the brake light is used incorrectly or malfunctions, it can easily lead to rear-end collisions.
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