Rollover protection systemTo optimise safety in the event of arollover, the Astra TwinTop is equippedwith reinforced windscreen frame andanti-roll bars behind the rear seat headrestraints.The anti-roll bars are fixed or deployabledepending on vehicle variant.Fixed anti-roll bars are secured to thevehicle bodywork (see illustration).Deployable anti-roll bars 3Located between the rear headrestraints and the boot lid in such a waythat they are out of sight. In the event ofa rollover, head-on collision or sideimpact, the anti-roll bars deployupwards within milliseconds.The convertible hardtop must not beoperated if the anti-roll bars have beendeployed. A continuous warning willsound if the switch is actuated.The airbag control indicator villuminates if the anti-roll bars have beendeployed.Wind deflector 3With the wind deflector installed,turbulence, draughts and noise in thepassenger’s compartment are reducedwhen the roof is open.The rear seats cannot be occupied whenthe wind deflector is in place.Place no objects on the wind deflector.The wind deflector is folded together in astowage compartment 3 in the luggagecompartment beneath the floor hatch.If vehicle is fitted with a spare wheel 3,the wind deflector is in the luggagecompartment.For instructions on how to fit and removewind deflector, see Owner’s Manual.Indicator and warning buzzersz Indicator buzzer upon completedopening or closing of the convertiblehardtop.z Indicator buzzer upon completedraising or lowering of the luggagecompartment loading aid.z Gong tone if the boot lid is not closedduring roof operation.z Gong tone if the boot lid is not fullyopening during operation of theluggage compartment loading aid.z Gong tone during roof operationif vehicle speed exceeds 20 mph(30 km/h).z Gong tone when vehicle speedexceeds 20 mph (30 km/h) if the roofis not fully open or closed.z Three gong tones during roof orloading aid operation if the luggagecompartment blind is not attached.z Three gong tones during roofoperation if outside temperature isbelow –20 °C, vehicle battery voltageis too low or the system is overloaded.z Continuous warning buzzer duringroof operation if the anti-roll bars 3have been triggered.z Continuous warning buzzer startingone minute before the end of the9-minute standby time with the roof inan intermediate position.z Continuous warning buzzer startingone minute before the end of the9-minute standby time with theluggage compartment loading aid ina raised position.Tyre pressures (psi) for loads ofup to 3 persons.Engines Tyres Front RearZ 16 XER, All except below 30 30Z 18 XER 225/40 R 18 33 30Z 16 LET All except below 33 30225/40 R 18 36 33Z 19 DTH All except below 33 30225/40 R 18 36 33Temporary spare wheelsAll T 115/70 R 16 61 61Tyre pressures (psi) ECO* for loads ofup to 3 persons.Engines Tyres Front RearZ 16 XER 205/55 R 16 36 36225/45 R 17 36 36Z 18 XER 205/55 R 16 36 36225/45 R 17 36 36* To achieve the smallest amountof fuel consumption possible.Not for use with run-flat tyres.Tyre pressures (psi) forfull loads.Engines Tyres Front RearZ 16 XER, All except below 32 38Z 18 XER 225/40 R 18 35 41Z 16 LET All except below 35 41225/40 R 18 38 44Z 19 DTH All except below 35 41225/40 R 18 38 44Temporary spare wheelsAll T 115/70 R 16 61 61