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Airbags
Warning signs In the car there are several warning signs related to the SRS. When working with SRS follow the instructions in labels. If labels are dirty or damaged, replace them with new ones.
Electrical system The airbag system includes a complex electrical and electronic components, so with the elements of the airbag must be handled very carefully. SRSCM (control unit security system) - Controls the opening of the airbag in the determination of a frontal impact sensor built into SRSCM. Direct current converter - Comprises a step-up and down converter, providing a voltage level for six airbag ignition circuits and internal operating voltage. If the internal operating voltage falls below a certain threshold, a reboot is performed. The sensor trigger / safety sensor - Built-in airbag ignition charge, supports the readiness of the airbag system in all conditions during normal movement. Safety sensor - a two-contact electromechanical switch that is closed if the detected acceleration (deceleration) exceeds a certain value. Power backup - Supplies of energy for an air bag deployment in a fraction of a second when the voltage of the electrical system of the car is low or absent because of a frontal impact. Fault detection. After ignition SRSCM constantly monitors the operation of the SRS and defines it possible faults. The fault may be determined in the form of a diagnostic code scanner using a Hi-Scan. The indicator lamp (MIL). If a fault is detected, it sends a signal to SRSCM warning lamp located in the instrument cluster. The indicator lamp (MIL) is the primary means of information about the driver's fault SRS. The security system is OK if the control lamp (MIL) flashes 6 times after the ignition is switched on and then goes out. Record faults. If the system is malfunctioning, SRSCM writes it into memory in the form of a fault code (DTC), and the code may be erased from the memory of the scanner only Hi-Scan. Diagnostic connector. The data stored in the memory SRSCM, are read by a scanner Hi-Scan through the diagnostic connector. After a single airbag deployment SRSCM unit can not be used - it must be replaced. The output on impact. This signal is used to control an external device that unlocks the door in case of an accident. A signal is defined as follows: 0-200 uA off and 200 mA in an ON state. In the case of signal unlock switch is closed for 200 ms.
Disclosure Module (DAB, PAB, SAB) Modules DAB (driver airbag), RAV (front passenger airbag), DSAB (driver side airbag) and PSAB (passenger side airbag) consist of the device opening and pillows. Uncovering device (the device igniting the gas generator) is located in the air bag module. When a frontal impact of sufficient force to close the circuit through the sensor SRSCM Airbag current begins to flow. He ignites the charge, and the airbag opens. 1. When removing the airbag module and work with the new module must be positioned so that the surface of the cushion facing upwards. Lever Lock connector with a double lock to be in a locked state, and must be handled with care to avoid damaging the connector. Do not store the steering wheel cushion pillows on top of another (storage cushion the metal surface can lead to serious consequences if the airbag accidentally revealed). 2. Never measure the resistance of the airbag squib - it can cause the air bag inflates. 3. Store the airbag module in a location where the ambient temperature exceeds 93 ?� C, high humidity and no electrical noise. 4. When using electric welding before starting work disconnect connectors airbag located underneath the steering column near the pin multifunction switch.
Harness the SRS SRS harness is located inside a yellow tube, so as not to confuse it with the other wiring harness systems. Inside pin connectors from the device uncovering DAB, PAB, DSAB, PSAB and BPT are jumpers. They close the electric current when disconnecting connectors. Thus, undesired expansion is the airbag module with cushions.
Activation of the lamp unit SRSCM Warning light SRS, located in the instrument cluster informs the driver of the operating status of SRS. There are some conditions under which SRSCM can not function, and therefore can not operate the lamp control security system. In such cases, the lamp is activated directly from the corresponding circuit, which operates independently of SRSCM, for example, in the following cases: - In the absence of the supply voltage to the ignition unit SRSCM lights up continuously; - In the absence of the internal operating voltage lights up continuously; - If SRSCM not connected, the lamp is switched via jumper to pin harness connector.
Watch-spring Clock (twisted) spring consists of two twisted coils. It is installed between the steering column and the steering wheel and allows the steering wheel to rotate, keeping constant contact with the air bag system of uncovering. The steering wheel should be properly installed on the steering column when the clock spring is in the neutral (middle) position. Otherwise the wire may break or other malfunctions occur.
The system for detecting the presence of the passenger (PPD) The detection system detects the presence of a passenger in the front seat passenger. This system is designed primarily to prevent the need to replace components of an airbag system, which is triggered when a crash is not necessary. The system consists of a PPD weight sensor. Threshold of PPD: - The seat is occupied - 15 kg; - Free seat - 0.6 kg. Sensor characteristics: RP <50 ohm for the weight> 15 kg; RP> 50 ohm for the weight of <0.6 kg where RP - resistor load indication.
Sensor-satellite Activating system side airbag unit includes SRSCM, installed in the center of the vehicle interior, and two satellite sensors located on the left and right sides of the vehicle. SRSCM unit activates the vehicle airbags and seat belt pretensioners. As a result, coordination of information between the unit and the sensor-SRSCM companion SRSCM unit outputs a signal for activation. Sensors satellites act as intelligent acceleration sensors and as a backup controller central air bags. Both sensors are constantly informed of the satellite control unit SRSCM about the current state of the left and right sides of the vehicle. The test results are reported to the control unit SRSCM through periodic status signals.
A WARNING When the ignition is never expose the impact area near the sensor satellites, or may suddenly trigger the airbag. |
Driver Airbag Module Withdrawal Disconnect the negative terminal of the battery and insulate it.
A WARNING Before continuing, wait at least 30 seconds after disconnecting the wire from the negative terminal of the battery. |
| Fig. 8.1. Driver Airbag Module and Clock Spring: 1 - clock spring; 2 - a nut of fastening of a steering wheel, 40-50 Nm; 3 - the driver airbag module; 4 - screws, 4-6 Nm; 5 - the steering wheel; 6 - steering
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On the reverse side of the steering wheel with an Allen key unscrew the protective cover of the steering wheel and air bag module (Fig. 8.1). When disconnecting the connector of clock spring from the air bag module, be careful and do not apply to it a lot of effort. To improve access, pull the locking air bags outside.
A WARNING When disconnecting the connector of the airbag module - the clock spring, be careful and do not apply to it a lot of effort. |
Remove the safety of the driver module.
A WARNING Removed air bag module should be stored in a clean dry place cover up. |
The device 09561-11002 remove a steering wheel.
A WARNING Do not hit with a hammer on the steering wheel - so may damage the mechanism of a deformable steering column. |
Check If the follow-up audit found worn or damaged parts, replace the new one. Dispose of the old unit as directed.
A WARNING Never attempt to measure the circuit resistance of the airbag module even special tester, or you may be the inadvertent disclosure of pillows, which can cause injury. |
1. Check the airbag cover for dents, cracks or deformation. 2. Check the airbag module in the absence of dents, cracks or deformation. 3. Check the attachment and connectors for damage, contacts - for deformation and wire - to extremes. 4. Check the enclosure uncovering pillows on absence of dents, cracks or deformation. 5. Install the air bag module to the steering wheel to check fit and alignment with the steering wheel. 6. Check clock spring for damage. If the test found at least one injury, replace the clock spring new. Check connectors and protective tube clock spring for damage, and contacts - the lack of deformations.
The module front passenger airbag Withdrawal
WARNINGS 1. Never attempt to disassemble and repair the airbag module. 2. Do not drop the air bag module, and do not let it contact with water, grease, and so on. D. If there are any dents, cracks, deformation or corrosion, replace the module. 3. The air bag module should be stored on a flat surface and placed so that the pillow cover facing up. Do not put the lid on any items. 4. Do not expose the air bag module to temperatures exceeding 93 ?� C. 5. Unopened airbag module must be disposed of only in accordance with the instructions. 6. Never attempt to measure the circuit resistance of the airbag module (charge), even a special tester. If the resistance measured by the tester may occur sudden disclosure of the airbag, which is very dangerous. 7. If the front passenger airbag opened, it should be replaced with a new additional wire |
Disconnect the negative terminal of the battery and insulate it.
A WARNING Before continuing, wait at least 30 seconds after disconnecting the wire from the negative terminal of the battery. |
Remove the glovebox. Unplug the connector module PAB. Remove the dashboard trim assembly, and then the module front passenger airbag. Cover the front passenger airbag is integrated into the instrument panel, so when opening the airbag must be replaced dashboard.
Diagnostics with the scanner Hi-Scan Prok Connect the connector of the scanner Hi-Scan Prok to the vehicle's diagnostic socket located on the left under the dashboard. Turn on the ignition and turn on the scanner Hi-Scan Prok. Check the DTCs. When DTC replace the corresponding defective item. Never try to repair the defective item. If the scanner Hi-Scan Prok discovers that element of the system is faulty, it may not defective element, and pin or wire SRS. Fault codes Fault codes additional security given in Table. 8.1.
Table 8.1 Fault codes extra security
Disposal of the airbag module
A WARNING When working with the reveal airbag caution and always wear safety glasses to combustion products do not fall into the eye. |
Disclosure of airbags in the vehicle
WARNINGS If the vehicle is intended for recycling, open the air bag in a car. Since the airbag opens with a great noise, do not spend the disclosure in a public place or warn others about it. In disclosing the airbag produces a lot of smoke, so work in a well-ventilated place. Do not try to work next to a fire sensor. |
Open all windows and doors of the vehicle. Move the car to an isolated place. Disconnect the negative terminal of the battery and insulate it.
A WARNING Before continuing, wait at least 30 seconds after disconnecting the wire from the negative terminal of the battery. Remove the central side cover cushions. |
Remove the center of the instrument panel cover. Remove the pin SRSCM airbags. Connect the device for airbag deployment to the pin of each module. Move as far away from the car, press the button (learned from the car) for an air bag deployment.
WARNINGS Before opening the pillow in such a way at first make sure that no one is inside and next to the car. Wear safety glasses. Device for operation will be quite hot immediately after opening, so let it cool at least 30 minutes before working on. Despite the fact that the gas released during airbag deployment is not poisonous, do not inhale it. If the airbag is not activated during the above operation, contact the service center. |
Recycling operations disclosed airbags After the disclosure of the airbag module must be disposed of in the prescribed manner, subject to the following. 1. A device for opening will be quite hot immediately after operation, so wait at least 30 minutes to allow the unit to cool. 2. Do not put water or oil on the pillow after its disclosure. 3. It may be that the module disclosed airbags will stick to any material that is harmful to the eyes and / or skin, so wear safety goggles and gloves. If we neglect these precautions, the material can get into the eyes or on the skin. Immediately flush eyes or skin with plenty of clean water. If irritation occurs consult a doctor. 4. Place the airbag module in the package of thick plastic. 5. When finished, wash your hands.
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