Honda Civic 2002-2003 Service Manual page 1040

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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 6 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 SRS unit memory stores a DTC that relates to the cause of the malfunction, and the unit is
connected to the data link circuit. This information can be read with the Honda PGM Tester when it is connected to the
data link connector (DLC) (see page 23-231.
23-33