The function of the rear flat lamp
The main function of the rear level light (rear position light) is to indicate the width of the vehicle and warn the traffic participants behind . It is especially used in dim light or bad weather to reduce the risk of rear-end collisions.
Specific function
Outline function: At night or in poor visibility conditions (such as heavy fog or heavy rain), the rear level light can help vehicles behind determine the position and width of their own vehicle, avoiding rear-end collisions.
Warning function: When a vehicle stops temporarily or there is a blind spot, the rear level light can alert other traffic participants to pay attention and reduce the risk of being hit.
Vehicle identification: When activated in dim light, it enables vehicles behind to spot those in front earlier, ensuring driving safety.
The activation methods may vary among different vehicle models. Common operation methods include rotating the light control lever and pressing the buttons on the center console, etc.
The malfunction of the rear flat light may be caused by a damaged bulb, circuit issues or a failure of the driver power supply. The common manifestations are that the light does not light up or flickers. The following are the specific solutions
Common causes and solutions
The bulb is broken
Youdaoplaceholder0 performance : The light is completely off or flickering
Youdaoplaceholder0 handles :
When replacing, make sure the vehicle is turned off to avoid electric shock
Select a new bulb (such as model and power) that matches the original bulb specification
Circuit problem
Youdaoplaceholder0 manifestations : loose circuits, poor contact or unstable voltage
Youdaoplaceholder0 handles :
Check if the wiring connection is loose, re-fix it and reinforce it with insulating tape
If the fuse is found to be blown, a fuse of the same specification should be replaced (please refer to the vehicle manual)
Drive power supply failure
Youdaoplaceholder0 performance : The flat panel lamp fails to start or frequently goes out abnormally
Youdaoplaceholder0 handles :
Check whether the appearance of the drive power supply is charred or deformed
If damaged, replace the drive power supply with matching parameters
Precautions
If it is difficult to repair it by yourself, it is recommended to go to a professional repair shop for handling
Regularly inspect the flat panel lamp and circuit to avoid poor contact caused by vibration
The rear lights remaining on are usually caused by brake switch failure, short circuit, bulb problem or operational error (such as the handbrake not being released). You can conduct a preliminary self-check by checking basic items such as handbrake reset, brake fluid level and brake light switch. If the problem cannot be solved, professional repair is required to avoid battery depletion or potential driving safety hazards.
Common reasons for the constantly lit rear lights
Continuous flashing of the rear lights is a common vehicle malfunction, mainly caused by the following four types of problems, which need to be dealt with specifically:
Youdaoplaceholder0 brake switch failure : If the contact of the switch located above the brake pedal gets stuck or the spring fails, it will cause the circuit to fail to disconnect, accounting for more than 60% of the fault cases.
Youdaoplaceholder0 Circuit system abnormality : Short circuits caused by aging, damage or moisture in the lines, or incorrect instructions sent by control modules (such as BCM) due to faults.
Youdaoplaceholder0 Bulb or hardware issue : taillight filament adhesion, glass breakage causing short circuit, or brake pad wear exceeding the limit triggering alarm.
Youdaoplaceholder0 operation or setting error : the handbrake is not fully reset, the door/trunk is not tightly closed, or the light switch is mistakenly touched to the "side marker light" mode.
Self-inspection and resolution steps
Non-professionals can prioritize the following operations, which will take approximately 3 to 5 minutes:
Youdaoplaceholder0 check basic operations :
Make sure the handbrake is fully released and there is no handbrake indicator light remaining on the dashboard.
Close all the car doors and the trunk to prevent the microswitch from being accidentally touched.
Youdaoplaceholder0 verify vehicle status :
Check the brake fluid level when the vehicle is cold. If it is below the lower limit, add DOT4 or the specified type of brake fluid.
Observe the thickness of the brake pads. If they wear down to less than 0.8cm or the metal backplate is exposed, they need to be replaced.
Youdaoplaceholder0 test brake light switch :
After turning off the engine, repeatedly press the brake pedal. If the light remains on after bouncing back, it indicates that the brake pedal is stuck. You can try disassembling the guard plate to check the oxidation condition of the contacts.
Youdaoplaceholder0 Emergency measures :
If immediate repair is not possible at night, you can unplug the emergency power cord in the trunk or short-circuit the fuse (please refer to the model manual), but you must go to the store for inspection the next day.
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