Active Bonnet Lift System

The Active Bonnet Lift System is a passive safety feature engineered specifically for pedestrian protection. By actively deploying and popping up the bonnet upon impact, it creates vital clearance and cushioning space over hard under-bonnet components to cushion the pedestrian's head and reduce severe injury.

⚙️ How It Works: Actively "Catching" Pedestrians

In the event of a frontal collision with a pedestrian, the active bonnet system reacts instantaneously:

1. Detection and Triggering: Pressure sensors embedded in the front bumper detect the impact and instantly send a signal to the Electronic Control Unit (ECU).

2. Instant Deployment: Once the ECU verifies a pedestrian impact, it fires the pop-up actuators (typically pyrotechnic or mechanical spring mechanisms), popping the rear edge of the bonnet up by roughly 85–100 mm in about 0.03 seconds.

3. Creating a Cushion Zone: The elevated bonnet forms a cushioning gap above rigid engine bay components such as the engine block and gearbox. When the pedestrian's head hits the bonnet, the panel deforms to absorb the impact energy, significantly lowering the Head Injury Criterion (HIC) score.

This setup is commonly paired with pressure tube sensors, which offer greater precision than conventional accelerometers to minimise false triggers. Higher-spec systems can also integrate with an external pedestrian airbag, deploying at the base of the windscreen and A-pillars for all-round impact absorption.

⚠️ Key Drawbacks: False Triggers and Expensive Repairs

While the active bonnet offers life-saving benefits, it does come with two notable real-world downsides:

• High Trigger Sensitivity: The system can struggle to distinguish between a human, an animal, or minor road hazards. Minor knocks, hitting kerbs, or striking stray animals can inadvertently set it off, resulting in unwanted false deployments.

• Steep Replacement Costs: Because the system is typically single-use (especially pyrotechnic setups), any deployment requires a full replacement of the bonnet hinges, lifting actuators, sensors, and wiring. Total repair and replacement bills can easily run from RM10,000 to well over tens of thousands of ringgit.

💡 Ownership and Practical Advice

• Pedestrian Safety Remains the Priority: It is important to note that while the high repair bill is a genuine headache, the primary purpose of this system is to save lives and mitigate fatal pedestrian injuries.

• Leave Repairs to the Authorised Service Centre: Once deployed, the bonnet stays propped up, which can obstruct forward visibility. While some models allow driving at low speeds to reach a workshop, your safest bet is to call roadside assistance or contact an authorised service centre. Never attempt to force or push the bonnet down yourself.

In summary, the active bonnet lift system is a proven safety technology that significantly boosts pedestrian protection, albeit one that comes with potential ownership costs after deployment.