SRS Operation

SRS Operation

The main circuit in the SRS 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 impact, the voltage regulator and the back-up power circuit respectively will keep voltage at a constant level.

For the SRS to operate:




1. The impact sensor must activate and send electronic signals to the microprocessor.
2. The microprocessor must compute the signals and send them to the airbag inflators (and seat belt tensioners).
3. The inflators must ignite and deploy the airbags (and activate the tensioners).

Self-diagnosis System

A self-diagnosis circuit is built into the SRS unit; when the ignition switch is turned ON (II), the SRS indicator comes on and goes off after about 6 seconds if the SRS is operating normally.
If the indicator does not come on, or does not go off after six seconds, or if it comes on while driving, it indicates an abnormality in the SRS. The SRS must be inspected and repaired as soon as possible.
For better serviceability, the memory will store the cause of the malfunction, and the data link circuit passes on information from memory to the data link connector (DLC). This information can be read with the Honda PGM Tester connected to the DLC (16P).