Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Advanced Head Protection System (AHPS): Operation
The Advanced HPS is fitted in the roof zone. It consists of a woven tube with an additional curtain wrapped around it. The curtain is secured to the roof frame and is tensioned downward by the woven tube.
In the event of a side collision, the generator is ignited and the gas flows through the gas injector into the woven tube. The woven tube expands to approx. 130 mm in diameter and its length is reduced.
Secure fitting of the woven tube on the A-pillar and the C-pillar HPS II or on the roof frame (AHPS I) brings the head airbag into position. In the process, the curtain tightens between the side window or pillar trim and the occupant.
The high tensioning force in the woven tube pulls the curtain downward, which increases the stability of the curtain. The closed system means that the structural firmness and stability remain for several seconds. This is an advantage if the vehicle rolls over.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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