Land Rover Body And Paint Air Bag And Safety Belt Rover Manual
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COMPONENT LOCATIONS, SHEET 1 OF 2 SRS warning indicator1 Driver air bag2 Clockspring3 Passenger air bag deactivation indicator4 Passenger air bag5 Passenger air bag deactivation switch (all except NAS) 6 Restraints control module7 (G421346) Technical Training254 Lesson 3 – Body and PaintAir Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS)
COMPONENT LOCATIONS, SHEET 2 OF 2 Door side impact sensor1 B pillar side impact sensor2 C pillar side impact sensor3 Third row side air curtain4 Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS) Lesson 3 – Body and Paint 255Technical Training (G421346)
First and second row side air curtain5 Safety belt pretensioner and buckle switch6 Seat position sensor7 Occupant classification module (NAS only)8 Seat cushion pressure sensor (NAS only)9 Seat cushion pressure pad (NAS only)10 Safety belt tension sensor (NAS only)11 Side air bag12 Front impact sensors13 GENERAL The Supplemental Restraint System (SRS) provides additional protection for occupants in certain vehicle accident conditions. The SRS consists of: •A driver air bag •A passenger air bag •A side air bag on each front seat •Side air curtains for first and second row seats •Side air curtains for third row seats (where fitted) •A pretensioner for each front safety belt •A buckle sensor for each front safety belt •Front and side impact sensors •A passenger air bag deactivation indicator •A passenger air bag deactivation switch (all except NAS) •An occupant monitoring system for the front passenger seat •A position sensor for the driver seat •An air bag warning indicator •A clockspring •A restraints control module. The SRS features selective activation of the air bags and pretensioners, and two stage driver and passenger air bags. The restraints control module monitors internal and external sensors and activates the required safety belt pretensioners and air bags if the sensors detect an impact or roll-over above preset limits. (G421346) Technical Training256 Lesson 3 – Body and PaintAir Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS)
DRIVER AIR BAG Release tool slot and guide channel1 Inflator stage 1 connector2 Inflator stage 2 connector3 Latch spring4 Locating pin and spring5 Latch hook6 The driver air bag forms the center pad of the steering wheel. Four pins and two latches locate and secure the driver air bag to the steering wheel. The latches consist of wire springs on each side of the driver air bag which engage with hooks in the steering wheel. The driver air bag is released from the steering wheel by pulling on the wire springs with a special tool inserted through a slot on each side of the steering wheel hub. Springs on the locating pins then push the driver air bag away from the steering wheel. A Lucar connector attaches a ground to the driver air bag. The driver air bag has a two stage inflator, with separate electrical connectors for each stage. The inflator contains a non-azide propellant as the gas generator. Lines molded into the inner surface of the driver air bag cover provide weak points that split open in a controlled manner when the driver air bag deploys. The inflated volume of the air bag is 57 liters (2.01 ft3). Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS) Lesson 3 – Body and Paint 257Technical Training (G421346)
PASSENGER AIR BAG Reinforcement lid1 Chute2 Passenger air bag3 In-vehicle crossbeam4 Mounting bracket5 Lucar connector Inflator connector6 Deployment doors7 The passenger air bag is located in the instrument panel, behind the upper glove compartment. The bottom of the passenger air bag is attached to a mounting bracket on the in-vehicle crossbeam. The top of the passenger air bag is attached to a chute, which, in turn, is attached to a reinforcement lid in the top of the instrument panel. When the air bag deploys, the chute guides the air bag to the underside of the reinforcement lid. The reinforcement lid incorporates two deployment doors that are forced open, splitting the instrument panel covering, when the air bag deploys. A Lucar connector attaches a ground to the passenger air bag. The passenger air bag has a two stage inflator, with separate electrical connectors for each stage. The inflator contains a non-azide propellant as the gas generator. The inflator uses a high pressure mix of air and hydrogen gas as the inflation medium. The inflated volume of the air bag is 130 liters (4.59 ft3). SIDE AIR BAGS NOTE: Left side air bag shown, right side air bag is mirror image Seat backrest frame1 Side air bag2 Cable3 (G421346) Technical Training258 Lesson 3 – Body and PaintAir Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS)
Inflator4 A side air bag is attached to the outside of each front seat backrest frame, under the backrest cover. The side air bags are handed, and each consist of a molded plastic case which contains the folded air bag and the inflator. A cable connects the igniter of the inflator to a connector in the main seat harness connector block located under the front edge of the seat cushion. When the air bag deploys it forces the front edge of the molded plastic case apart and splits open the backrest cover. The side air bags use compressed argon as the inflation medium. The inflated volume of each side air bag is 12 liters (0.42 ft3). SIDE AIR CURTAINS The side air curtains are designed to protect the head and upper body in side impact and roll-over situations. The first and second row side air curtains are a standard fit on all vehicles. The third row side air curtains are fitted on seven seat vehicles only. The side air curtains use compressed argon as the inflation medium. First and Second Row Side Air Curtain NOTE: Right side air curtain shown, left side air curtain is mirror image Air curtain anchorage points1 Non inflatable section of air curtain2 Air curtain clip (manufacturing aid)3 Front gas guide attachment4 Inflatable section of air curtain5 B pillar ramp6 Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS) Lesson 3 – Body and Paint 259Technical Training (G421346)
Securing screws7 Active tether device8 Rear tether anchor9 Rear tether10 Cant rail clip11 Gas guide pipe12 Inflator electrical connector13 Inflator14 Inflator mounting bracket15 The first and second row side air curtains are installed on the cant rails above the front and rear doors, behind the headliner. Each side air curtain has an inflator, which is attached to the header rail by a mounting bracket and two screws. The inflator is connected to the air curtain by a gas guide pipe. The gas guide pipe and air curtain are secured along the cant rail by a fixing at the front of the gas guide pipe, two fixings at the B pillar ramp, two clips and two screws, and two fixings at the end of the gas guide pipe and C pillar ramp. At the rear of the air curtain, an active tether device is clipped in two positions down the C pillar. At the bottom of the active tether device is a fixing anchorage. The front of the air curtain is secured to the A pillar by two fixings. When the side air curtain deploys, it breaks out of the B pillar ramp and the clips on the cant rail and extends downwards from behind the headliner. The deploying air curtain is tensioned between the anchorage points on the A pillar and the active tether device on the C pillar. This retains the air curtain in position against the upper part of the doors and the B pillar. (G421346) Technical Training260 Lesson 3 – Body and PaintAir Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS)
Third Row Side Air Curtain NOTE: Right side air curtain shown, left side air curtain is mirror image Securing screw1 Air curtain2 Securing screw3 Rear tether4 Gas guide pipe5 Inflator mounting bracket6 Inflator7 Rear tether anchor8 Tether housing9 Rear tether10 Front tether anchor11 The third row side air curtains are installed on the cant rails above the rear quarter windows, behind the headliner. Each side air curtain has an inflator, which is attached to the D pillar by a mounting bracket and two screws. The inflator is connected to the air curtain by a gas guide pipe. The gas guide pipe and air curtain are secured to the cant rail by two screws. Tethers are attached to the front and rear of the air curtain. The front tether is anchored to the C pillar. The rear tether is anchored to the D pillar and held in position by a tether housing. When a third row side air curtain deploys, it extends downwards from behind the headliner. The expanding air curtain tightens the tethers, which retain the air curtain in position against the rear quarter window. Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS) Lesson 3 – Body and Paint 261Technical Training (G421346)
PRETENSIONERS Safety belt buckle1 Boot2 Anchor bolt3 Piston and tube4 Electrical connectors for inflator and buckle switch 5 The pretensioners are used to tighten the front safety belts during a collision to ensure the occupants are securely held in their seats. A pretensioner is integrated into each front safety belt buckle. Each pretensioner has a tube containing an inflator and a piston. The inflator is connected to the restraints control module. The piston is attached to a steel cable, the opposite end of which is attached to the safety belt buckle. On receipt of a fire signal from the restraints control module, the inflator generates nitrogen gas that rapidly expands to drive the piston along the tube, pulling the cable and drawing the safety belt buckle downwards. SAFETY BELT SENSORS The buckle of each front safety belt incorporates a Hall effect sensor that provides a safety belt status signal to the restraints control module. The restraints control module broadcasts the status of the two front safety belts on the high speed Controller Area Network (CAN) bus for use by the instrument cluster. IMPACT SENSORS Impact sensors are installed in the front and both sides of the vehicle. The use of multiple impact sensors provides shorter air bag trigger times, through faster detection of lateral and longitudinal acceleration, and improves detection accuracy. There are two front impact sensors attached to brackets on the body front support frame, just above each front longitudinal. There are six side impact sensors located in the passenger compartment, as follows: •One attached to each front door. •One attached to the base of each B pillar. •One attached to the top of each rear wheel arch. (G421346) Technical Training262 Lesson 3 – Body and PaintAir Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS)
Each impact sensor incorporates an accelerometer and a microcontroller powered by a feed from the restraints control module. The power feed also provides the interface connection through which the side impact sensor communicates with the restraints control module using serial data messages. Acceleration is evaluated by the microcontroller and transmitted to the restraints control module, which then makes the decision on whether or not to activate the air bags and pretensioners. When the ignition is switched on the restraints control module supplies power to the impact sensors, which perform a self test. After satisfactory self tests the impact sensors continually output sensor active messages to the restraints control module. If a fault is detected the relevant impact sensor sends a fault message, instead of the sensor active message, to the restraints control module. The restraints control module then stores a related fault code and illuminates the air bag warning indicator. PASSENGER AIR BAG DEACTIVATION INDICATOR Deactivation indicator (NAS and Japan)1 Deactivation indicator (all except NAS and Japan) 2 The passenger air bag deactivation indicator is installed on the center switch pack of the instrument panel. When appropriate, the indicator illuminates to advise front seat occupants that the passenger air bag is disabled. Operation of the indicator is controlled by the restraints control module. The restraints control module illuminates the indicator when: •There is a fault with the passenger air bag firing circuit(s). •The passenger air bag is deactivated with the passenger air bag deactivation switch (where fitted). •Required by passenger seat occupant monitoring (see below). Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS) Lesson 3 – Body and Paint 263Technical Training (G421346)