Land Rover Body And Paint Air Bag And Safety Belt Rover Manual
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PASSENGER AIR BAG DEACTIVATION SWITCH (ALL EXCEPT NAS) The passenger air bag deactivation switch provides a method of manually disabling the passenger air bag. The switch is installed in the front passenger end of the instrument panel and operated by the ignition key. When the passenger air bag deactivation switch is operated, it changes a ground connection between two pins in the connectors of the restraints control module. When the passenger air bag deactivation switch is selected to OFF, the restraints control module disables the passenger air bag and, if the front passenger seat is occupied, illuminates the passenger air bag deactivation indicator. OCCUPANT MONITORING Occupant monitoring provides the restraints control module with the occupancy status of the front passenger seat. On NAS vehicles, the restraints control module uses the occupancy status for control of the passenger air bag deactivation indicator. There are two types of occupant monitoring: •In all markets except NAS, vehicles have an occupant detection system. •In NAS markets, vehicles have an occupant classification system. Occupant Detection System (All Except NAS) Seat cushion1Pressure sensor2 (G421346) Technical Training264 Lesson 3 – Body and PaintAir Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS)
The occupant detection system can only determine if the front passenger seat is occupied or unoccupied. The occupant detection system consists of a pressure sensor installed between the foam padding and the cover of the front passenger seat cushion. The pressure sensor incorporates a number of load cells connected in series and embedded in a plastic film. Weight on the pressure sensor increases the resistance of the circuit. The instrument cluster supplies a reference voltage to the pressure sensor and measures the current draw to determine the occupancy status. From the occupancy status, and the status of the front passenger safety belt (received from the restraints control module on the high speed CAN bus), the instrument cluster determines the belt minder status. Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS) Lesson 3 – Body and Paint 265Technical Training (G421346)
Occupant Classification System (NAS Only) Seat cushion1 Pressure pad2 Pressure tube3 Pressure sensor4 Safety belt tension sensor5 Occupant classification module6 The occupant classification system can determine if the front passenger seat is unoccupied, occupied by a small person, or occupied by a large person. The occupant classification system consists of: •A pressure pad, installed under the cushion of the front passenger seat, which is connected to a pressure sensor. (G421346) Technical Training266 Lesson 3 – Body and PaintAir Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS)
•A safety belt tension sensor, integrated into the anchor point of the front passenger safety belt. •An occupant classification module, installed under the front passenger seat. The pressure pad is a silicone filled bladder. Any load on the pressure pad is detected by the pressure sensor. The safety belt tension sensor is a strain gauge that measures the load applied by the safety belt anchor to the anchor bolt. The occupant classification module supplies a reference voltage to the pressure sensor and the safety belt tension sensor and, from the return signals, measures the loads acting on the pressure pad and the safety belt tension sensor. The load measurement from the safety belt tension sensor is used to produce a correction factor for the load measurement from the pressure pad. The tightness of the safety belt affects the load acting on the pressure pad, so without the correction factor the occupant classification module cannot derive an accurate occupancy status. The occupant classification module translates the load readings into a seat occupancy status and transmits the result to the restraints control module, on a dedicated high speed CAN bus link. The occupant classification module incorporates two load limits for the seat cushion: When the load exceeds the lower limit, but is less than the upper limit, the occupant is classified as small; when the upper limit is exceeded, the occupant is classified as large. The occupant classification system has four possible states: •Empty. Passenger air bag operation is disabled and the passenger air bag deactivation indicator remains off. •Occupied inhibit. The seat is occupied by a small person. Passenger air bag operation is disabled and the passenger air bag deactivation indicator is illuminated. •Occupied allow. The seat is occupied by a large person. Passenger air bag operation is enabled and the passenger air bag deactivation indicator remains off. •Error. There is a fault with the system. Only stage 1 (slowest deployment speed) passenger air bag operation is enabled and the passenger air bag deactivation indicator remains off. Occupant Classification Module Harness Connector C0962 Occupant Classification Module Harness Connector C0962 Pin Details Input/OutputDescriptionPin No. InputSafety belt tension sensor signalA OutputSafety belt tension sensor reference voltageB InputSafety belt tension sensor groundC OutputModule groundD Input/OutputHigh speed CAN bus highE Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS) Lesson 3 – Body and Paint 267Technical Training (G421346)
Input/OutputDescriptionPin No. Input/OutputHigh speed CAN bus lowF InputIgnition power feedG InputSeat cushion pressure sensor groundH OutputSeat cushion pressure sensor reference voltageJ InputSeat cushion pressure sensor signalK SEAT POSITION SENSOR Seat frame1 Mounting plate2 Seat position sensor3 Electrical connector4 Target plate5 Seat base6 The seat position sensor allows the restraints control module to detect when the driver seat is forward of a given point on the seat track. The seat position sensor consists of a Hall effect sensor attached to the driver seat frame and a target plate on the seat base. While the ignition is on, the restraints control module supplies the sensor with a power supply of 12V nominal, and monitors the return voltage. When the seat frame moves forwards, the sensor moves over the target plate, which changes the reluctance of the sensor. The change of voltage is detected by the restraints control module and used as a switching point. The switching point is when the center of the sensor is 3 ± 4 mm from the leading edge of the target plate. When the driver seat is forward of the switching point, the restraints control module increases the time delay between firing the two stages of the inflator in the driver air bag. When the driver seat is rearward of the switching point, uses the normal time delay between firing the two stages. (G421346) Technical Training268 Lesson 3 – Body and PaintAir Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS)
AIR BAG WARNING INDICATOR The air bag warning indicator consists of a red Light Emitting Diode (LED) behind a SRS graphic in the tachometer of the instrument cluster. Operation of the air bag warning indicator is controlled by a high speed CAN bus message from the restraints control module to the instrument cluster. The restraints control module illuminates the air bag warning indicator if a fault is detected, and for approximately 6 seconds during the bulb check at the beginning of each ignition cycle. CLOCKSPRING Electrical connector for steering wheel switch packs and horn 1 Inner rotor2 Outer housing securing lug3 Driver air bag link leads4 Viewing window5 Drive peg6 Stopper7 Electrical connector for steering column harness8 Outer cover9 The clockspring is installed on the steering column to provide the electrical interface between the fixed wiring harness of the steering column and the components that rotate with the steering wheel, i.e. the driver air bag, the horn and the steering wheel switch packs. Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS) Lesson 3 – Body and Paint 269Technical Training (G421346)
The clockspring consists of a plastic cassette which incorporates an outer cover fixed to the steering column and an inner rotor which turns with the steering wheel. Four securing lugs attach the cover to the multifunction switch on the steering column. The rotor is keyed to the steering wheel by a drive peg. A lug on the underside of the rotor operates the self-cancelling feature of the turn signal indicator switch. A ribbon lead, threaded on rollers in the rotor, links two connectors on the cover to two connectors on the rotor. Link leads for the driver air bag are installed in one of the connectors on the rotor. To prevent damage to the ribbon lead, both the steering and the clockspring must be centralized when removing and installing the clockspring or the steering wheel. The clockspring is centralized when the drive peg is at six oclock and 50 - 100% of a yellow wheel is visible in the viewing window. Replacement clocksprings are fitted with a stopper, which locks the cover to the rotor, in the central position. The stopper must be broken off when the replacement clockspring is installed. RESTRAINTS CONTROL MODULE The restraints control module is installed on the top of the transmission tunnel, in line with the B pillars, and controls operation of the SRS. The main functions of the restraints control module include: •Crash detection and recording. •Air bag and pretensioner firing. •Self test and system monitoring, with status indication via the air bag warning lamp and non volatile storage of fault information. A safing sensor in the restraints control module provides confirmation of an impact to verify if air bag and pretensioner activation is necessary. A roll-over sensor monitors the lateral attitude of the vehicle. Various firing strategies are employed by the restraints control module to ensure that during an accident only the appropriate air bags and pretensioners are fired. The firing strategy used also depends on the inputs from the safety belt switches and the occupant monitoring system. An energy reserve in the restraints control module ensures there is always a minimum of 150 milliseconds of stored energy available if the power supply from the ignition switch is disrupted during a crash. The stored energy is sufficient to produce firing signals for the driver air bag, the passenger air bag and the safety belt pretensioners. When the ignition is switched on the restraints control module performs a self test and then performs cyclical monitoring of the system. If a fault is detected the restraints control module stores a related fault code and illuminates the air bag warning indicator. The faults can be retrieved by T4 on a dedicated link between the restraints control module and the diagnostic socket. If a fault that could cause a false fire signal is detected, the restraints control module disables the respective firing circuit, and keeps it disabled during a crash event. Restraints Control Module Harness Connector C0256 (G421346) Technical Training270 Lesson 3 – Body and PaintAir Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS)
Restraints Control Module Harness Connector C0256 Pin Details Input/OutputDescriptionPin No. OutputLeft side air bag feed1 InputLeft side air bag return2 OutputLeft first and second row side air curtain feed3 InputLeft first and second row side air curtain return4 OutputRight first and second row side air curtain feed5 InputRight first and second row side air curtain return6 OutputLeft third row side air curtain feed7 InputLeft third row side air curtain return8 OutputRight third row side air curtain feed9 InputRight third row side air curtain return10 -Not used11 and 12 Output/InputLeft C pillar side impact sensor feed and data13 InputLeft C pillar side impact sensor return14 Output/InputRight C pillar side impact sensor feed and data15 InputRight C pillar side impact sensor return16 OutputDriver safety belt pretensioner feed17 InputDriver safety belt pretensioner return18 -Not used19 and 20 OutputRight side air bag feed21 InputRight side air bag return22 OutputSeat position sensor feed23 OutputPassenger air bag deactivation switch feed (on selection)24 OutputDriver safety belt buckle sensor feed25 OutputFront passenger safety belt buckle sensor feed26 Output/InputLeft B pillar side impact sensor feed and data27 InputLeft B pillar side impact sensor return28 Output/InputRight B pillar side impact sensor feed and data29 Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS) Lesson 3 – Body and Paint 271Technical Training (G421346)
Input/OutputDescriptionPin No. InputRight B pillar side impact sensor return30 Input/OutputHigh speed CAN bus high (main network)31 Input/OutputHigh speed CAN bus low (main network)32 Input/OutputHigh speed CAN bus low (link to occupant classification module, where fitted) 33 Input/OutputHigh speed CAN bus high (link to occupant classification module, where fitted) 34 OutputFront passenger safety belt pretensioner feed35 InputFront passenger safety belt pretensioner return36 Output/InputLeft door side impact sensor feed and data37 InputLeft door side impact sensor return38 Output/InputRight door side impact sensor feed and data39 InputRight door side impact sensor return40 Restraints Control Module Harness Connector C1649 Restraints Control Module Harness Connector C1649 Pin Details Input/OutputDescriptionPin No. OutputDriver air bag stage 1 feed1 InputDriver air bag stage 1 return2 OutputPassenger air bag stage 1 feed3 InputPassenger air bag stage 1 return4 OutputDriver air bag stage 2 feed5 (G421346) Technical Training272 Lesson 3 – Body and PaintAir Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS)
Input/OutputDescriptionPin No. InputDriver air bag stage 2 return6 -Not used7 to 10 Input/OutputISO 9141 K line diagnostic bus11 InputIgnition power supply12 OutputPassenger air bag stage 2 feed13 InputPassenger air bag stage 2 return14 OutputPassenger air bag deactivation indicator15 OutputPassenger air bag deactivation switch feed (off selection)16 OutputCrash signal17 -Ground18 Input/OutputRight front impact sensor feed and data19 InputRight front impact sensor return20 Input/OutputLeft front impact sensor power and data21 InputLeft front impact sensor ground22 -Not used23 and 24 SRS OPERATION General In a collision, the sudden deceleration or acceleration is measured by the safing sensor in the restraints control module and by the impact sensors. The restraints control module evaluates the readings to determine the impact point on the vehicle and whether the deceleration/acceleration readings exceed the limits for firing any of the air bags or pretensioners. During a collision, the restraints control module only fires the air bags and pretensioners if the safing sensor confirms that the data from the remote sensor(s) indicates an impact limit has been exceeded. The restraints control module also monitors the vehicle for a roll-over accident using the internal roll-over sensor and high speed CAN bus messages from the Anti-lock Brake System (ABS) module and the steering angle sensor. The restraints control module incorporates the following impact thresholds to cater for different accident scenarios: •Front impact, pretensioners. •Front impact, driver and passenger air bags stage 1, belt unfastened. •Front impact, driver and passenger air bags stage 2, belt unfastened. •Front impact, driver and passenger air bags stage 1, belt fastened. •Front impact, driver and passenger air bags stage 2, belt fastened. •Rear impact. •LH side impact. Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS) Lesson 3 – Body and Paint 273Technical Training (G421346)