Honda 2002 Accord Manual page 1444

SRS
System Description (cont'd)
S R S Operation
The main circuit in the S R S unit senses and judges the force of impact and, if necessary, ignites the inflator charges. If
battery voltage is too low or power is disconnected due to the impact, the voltage regulator and the back-up power
circuit, respectively, will keep voltage at a constant level.
For the S R S to operate:
Driver's and Front Passenger's Airbag(s)
(1) The frontal impact sensor must activate, and send electric signals to the microprocessor.
(2) The microprocessor must compute the signals, and depending on the severity of the collision and whether the seat
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.
Side Airbag(s)
(1) The side impact sensors must activate, and send electric signals to the microprocessor.
(2) The microprocessor must compute the signals and send them to the side airbag inflator(s). However, the
microprocessor cuts off the signals to the front passenger's side airbag if the S R S unit determines that the front
passenger's head is in the deployment path of the side airbag.
(3) The inflator that received the signal must ignite and deploy the side airbag.
(With side airbag)
(With side airbag)
Self-diagnosis System
A self-diagnosis circuit is built into the S R S unit; when the ignition switch is turned ON (II), the S R S indicator light
comes on and goes off after about 6 seconds if the system is operating normally.
If the light does not come on, or does not go off after 6 seconds, or if it comes on while driving, it indicates an
abnormality in the system. The system must be inspected and repaired as soon as possible.
For better serviceability, the S R S unit memory stores a DTC that relates to the cause of the malfunction, and the unit is
connected to the Data Link Connector (DLC). This information can be read with the Honda PGM Tester when it is
connected to the DLC (16P).
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