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GENERAL
The SRS (Airbag) consists of : a driver airbag module located in the center of the steering wheel, which contains a folded cushion and an inflator unit ; a passenger airbag module located in the passenger side crash pad which contains a folded cushion together with an inflator unit ; side airbag modules located in the driver and passenger seat which contain folded cushions and inflator units; SRSCM located on the floor center console core which monitors the system,; an accelerometer which senses vehicle deceleration,; a spring interconnection (clock spring) located within the steering column; system wiring and wiring connectors; and a knee bolster located under the steering column. The impact sensing function of the SRSCM is carried out by the electronic accelerometer that continuously measures the vehicle's acceleration and delivers a corresponding signal through an amplifying and filtering circuit to the microprocessor. Deployment of the airbag is designed to occur in frontal or near-frontal side impacts of moderate to severe force. CUSTOMER CAUTIONS Further, if a mistake is made in servicing the airbag system, it is possible that the airbag may fail to operate when required.
1. | Be sure to proceed with airbag related service only after approx. 30 seconds or longer from the time the ignition switch is turned to the LOCK position and the negative (-) terminal cable is disconnected from the battery. The airbag system is equipped with a back-up power source to assure the deployment of airbags when the battery cable is disconneted during an accident. The back-uppower is available for approx. 150ms.
2. | When the negative(-) terminal cable is disconnected from the battery, the clock and audio system's memory will be wiped out. So before starting work, make a record of the contents of the audio system's memory. When the work is finished, reset the audio system and adjust the clock.
3. | Symptoms of malfunction of the airbag system are difficult to detect, so the diagnostic codes become the most important source of information when troubleshooting.
4. | When troubleshooting the airbag system, always inspect the diagnostic codes before disconnecting the battery.
5. | Never use airbag parts from another vehicle. When replacing parts, replace them with new parts.
6. | Never attempt to disassemble and repair the airbag modules (DAB, PAB, SAB, BPT), clock spring and wiring in order to reuse them.
7. | If any component of SRS has been dropped, or if there are cracks, dents or other defects in the case, bracket or connector, replace them with new ones.
8. | After work on the airbag system is completed, perform the SRS SRI check. The airbag indicator lamp can be triggered by faults in other circuit in some cases. Therefore if the airbag indicator lamp goes on, be sure to erase the DTC codes using Hi-scan just after repairing or replacing the troubled parts,including the fuse.
9. | Especially when carring out body welding, never fail to disconnect the battery's negative (-) terminal.
SRSCM The SRS airbag system has sophisticated electrical and electronic components. Therefore the airbag operating components should be handled very carefully. The SRSCM will deploy the airbag modules by sensing the frontal impact sensed by the sensor built in to the SRSCM.
1. | DC/DC convertor : The DC/DC converter in the power supply includes a step-up and a step-down converter, which provides the firing voltage for four firing circuits and the internal operating voltage. If the internal operatingvoltage falls below a defined threshold, a reset is executed.
2. | Arming sensor/safing sensor : The arming/safing sensor built in to the airbag firing circuit has the function of arming the airbag circuit under all required deployment conditions and maintaining the airbag firing circuits unarmed under normal driving conditions. The safing sensor is a dual-contact electromechanical switch that closes if it experiences a deceleration exceedinga specified threshold.
3. | Back-up power : The SRSCM reserves an energy reserve to provide deployment energy for a short period when the vehicle voltage is low or if lost in avehicle frontal crash.
4. | Malfunction detection : The SRSCM continuously monitors SRS operating status while the ignition key is turned on and detects possible malfunctions in the system. The malfunction can be displayed in the form of a diagnostictrouble code using the Hi-Scan Pro.
5. | MIL (Malfunction Indication Lamp) notification : If any fault is detected, the SRSCM sends a signal to the indicator lamp on the instrument cluster towarn the vehicle driver. The MIL indicator is the key item in notifying the driver of SRS faults. It verifies lamp and SRSCM operation by flashing 6 times when the ignitionswitch is first turned on.
6. | Malfunction recording : Once a fault occurs in the system, the SRSCM records the fault in memory in the form of a DTC, which can only be erasedby the Hi-Scan Pro.
7. | Data link connector : SRSCM memory stored is linked through this connector located underneath the driver side crash pad to an external output devicesuch as the Hi-Scan Pro.
8. | What if only BPT's deploy
9. | Crash output The crash output is used to unlock the doors in case of a crash. The crash output is : 0-200 λA in OFF mode and 200mA in ON mode. During theunlock command, the switch is closed for 200 mS.
SRSCM (SUPPLEMENTAL RESTRAINTS SYSTEM CONTROL MODULE)
1. | When removing the airbag module or handling a new airbag module, it should be placed with the pad top surface facing up. In this case, the twin-lock type connector lock lever should be in the locked state and care should be taken to place it so the connecter will not be damaged. Do not store a steering wheel pad on top of another one. (Storing the pad with its metallic surface up may lead to a serious accident if the airbag should inflate accidentally.)
2. | Never measure the resistance of the airbag squib. (This may cause the airbag to deploy, which is very dangerous.)
3. | Store the airbag module where the ambient temperature remains below 93°C (200°F), without high humidity and away from electrical noise.
4. | During electric welding, disconnect the airbag under the steering column near the MULTI-FUNCTION SWITCH connector before starting work.