Subaru Impreza 2003 Service Manual page 2899

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
AIRBAG SYSTEM (DIAGNOSTICS)
T: DTC 55
This code is displayed when the side airbag is deployed.
When this code is displayed, the memory cannot be erased. Replace the following parts.
• Airbag control module. <Ref. to AB-16, Airbag Control Module.>
• Front seat with side airbag module. (Operating side) <Ref. to SE-6, Front Seat.>
• Side airbag sensor. (Operating side) <Ref. to AB-17, Side Airbag Sensor.>
AB-73