Subaru 2009 IMPREZA Service Manual page 2842

Step
5 CHECK AIRBAG CONTROL MODULE.
1) Connect all connectors.
2) Clear the memory.
3) Perform the Inspection Mode.
4) Read the DTC.
6 CHECK FOR ANY OTHER DTC ON DISPLAY. Is any other DTC displayed?
Diagnostic Chart with Trouble Code
Is the same DTC displayed?
AB(diag)-53
AIRBAG SYSTEM (DIAGNOSTICS)
Check Yes
Replace the airbag
control module.
<Ref. to AB-21,
Airbag Control
Module.>
Check DTC using
"List of Diagnostic
Trouble Code
(DTC)". <Ref. to
AB(diag)-38, List
of Diagnostic Trou-
ble Code (DTC).>
No
Go to step 6.
Finish the diagno-
sis.