HOWO A7 T7H TX Brake Light Switch / Braking Light Switch WG9718710004

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HOWO A7 T7H TX Brake Light Switch / Braking Light Switch WG9718710004

Core Functions and Operating Principles
Typically an air-pressure sensor or a mechanical contact switch, its primary role is to execute the following control actions when the driver applies the brakes:
1. Activating rear brake lights: When the driver presses the brake pedal, the switch detects a change in air pressure or physical displacement and instantly closes the electrical circuit, illuminating the red brake lights at the rear of the truck to warn following vehicles of deceleration.
2. Disengaging cruise control: If the truck is in cruise control mode, touching the brake pedal triggers an electrical signal from the switch that commands the vehicle controller (ECU/CBCU) to immediately exit cruise mode and return control to the driver, ensuring driving safety.
3. Coordinating braking control: Transmitting an initial braking signal to the EBS (Electronic Braking System) or ABS (Anti-lock Braking System).

Common Faults and On-site Maintenance
1. Rear brake light stays on continuously: Internal contacts have fused/stuck together, or the return spring has failed. This prevents following drivers from determining when you are actually braking, creating a high risk of rear-end collisions; additionally, prolonged power flow can burn out the tail light bulb and drain the battery.
2. Tail light fails to illuminate when braking / Cruise control cannot be disengaged by braking: Severe oxidation or carbon buildup on the internal contact surfaces prevents electrical continuity.
3. Emergency troubleshooting: If the tail light does not turn on, unplug the switch connector and use a short piece of wire to directly short-circuit the two signal wires within the connector. If the tail light illuminates, the power supply circuit is intact; the issue is definitely a faulty WG9718710004 switch, so simply replace it with a new one.

DETAILS

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