What is the driver's side dashboard cover of the car?
The driver's side KAB cover plate refers to the protective cover structure installed in front of the Driver Knee Airbag (KAB) module. Its main function is to cover, fix and protect the airbag module when it is not in a collision state, while it can be quickly opened upon airbag activation to ensure the normal deployment of the airbag.
Core functions and features
Protective function: It covers the KAB airbag module at all times to prevent dust and foreign objects from entering and maintain the interior appearance.
Trigger guidance: In the event of a frontal collision, the airbag inflates rapidly, and the cover plate will open in a preset manner (such as tearing, flipping or crushing) to provide a path for the airbag to deploy.
Structural design: It is usually made of plastic or composite materials and integrated into the inner side of the steering column guard plate below the steering wheel. Some models will have the label "SRS KNEE AIRBAG" marked. Installation location
Located beneath the driver's steering wheel, specifically inside the steering column guard, it is directly in front of the driver's natural knee position.
Open the front glove compartment or lean over to inspect the bottom of the steering wheel. Usually, a detachable plastic panel can be seen, which is the driver's KAB cover plate.
Technological evolution
Traditional KAB cover plates often adopt a "crushing" design, which is destroyed when the airbag deploys;
New technologies (such as some Ford models) have eliminated the crushing plastic panel and replaced it with a lighter, more lightweight and responsive opening structure to improve protection efficiency.
Related maintenance and patent information
Removing and installing the driver's KAB cover plate assembly is a standard operation in automotive maintenance. For example, detailed steps are provided in the 2019 BYD Qin Pro EV Super Energy Edition Maintenance Manual.
In 2025, Changchun Fengsheng Yu Automation Technology Co., Ltd. applied for the patent "KAB Safety Airbag Shell Cover Plate Bending Machine", which is used to improve the manufacturing accuracy and anti-deformation ability of the cover plate, ensuring the normal deployment of the airbag.
According to public information, "KAB cover plate" usually refers to the control unit "KAB-camera cover plate" (code N42) in the Mercedes-Benz series. Its faults often manifest as fault code B129B55, meaning "The camera cover plate of the control unit has a functional failure and the component is not configured".
Fault characteristics and handling suggestions
Fault phenomenon: During rapid testing, the fault code B129B55 is stored, but it has no actual impact on the system functions.
Root cause: The control unit N42 code is missing or incorrect, not due to hardware damage.
Solution:
Perform a new SCN (system configuration) code for the control unit "KAB-camera cover plate" (N42).
Note: This fault is commonly found in Mercedes C-Class (W205/B217) models equipped with rearview cameras but without code 501.
Other possible confusing "cover plate" issues
If it is actually referring to the driver's seat side trim panel, the snap fastener breaking or the cover plate loosening, it belongs to different components and is common in models such as Wuling Binyou and Toyota Camry. The handling methods include:
Replacing the snap fastener or trim panel;
Adjusting the driving posture to reduce lateral force;
Contacting a 4S store within the warranty period for free repair. If the specific model and fault scenario can be confirmed, a more precise judgment can be made.
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