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02 − SRS Operation (’02 Model) For the SRS to operate Driver’s and Front Passenger’s Airbag(s) Side Airbag(s) Self-diagnosis System 23-58 SRS System Description (cont’d) SEAT BELT DRIVER’S FRONT SEAT BELT TENSIONER TENSIONER PASSENGER’S SIDE REEL MICROPROCESSOR and DIAGNOSTIC CIRCUIT INFLATOR SECOND AIRBAG DRIVER’S DRIVER’S CABLE UNIT OPDS SENSOR OPDS FIRST FRONT INFLATOR AIRBAG PASSENGER’S AIRBAG INFLATOR SIDE AIRBAG DRIVER’S PASSENGER’S INFLATOR FRONT SECOND SIDE AIRBAG FRONT INFLATOR PASSENGER’S CIRCUIT POWER SUPPLY FRONT AIRBAG FRONT DRIVER’S SENSOR SIDE IMPACT PASSENGER’S SENSOR IMPACT SIDE FRONT SRS UNIT IMPACT SRS GND TRIGGER CIRCUIT IDC SCS MES DLC DATA MEMORY IMPACT UNDER DASH VA VB SENSOR SENSOR LEFT IMPACT FRONT RIGHT The main circuit in the SRS unit sensors and judges the force of impact and, if necessary, ignites the inflator charges. If (1) A front impact sensor must activate, and send electric signals to the microprocessor. belt buckle switch is ON or OFF, it sends the appropriate signals to the airbag inflator(s). (3) The inflators that received signals must ignite and deploy the airbags. (1) A side impact sensor must activate, and send electric signals to the microprocessor. microprocessor cuts off the signals to the front passenger’s side airbag if the SRS unit determines that the front (3) The inflator that received the signal must ignite and deploy the side airbag. A self-diagnosis circuit is built into the SRS unit; when the ignition switch is turned ON (II), the SRS indicator comes on For better serviceability, the SRS unit memory stores a DTC that relates to the cause of the malfunction, and the unit is 03/07/29 10:32:45 61S0X050_230_0058 |