Subaru 2003 LEGACY Quick Reference Index page 42

DIAGNOSTIC CHART WITH DIAGNOSTIC TROUBLE CODE (DTC)
AIRBAG SYSTEM (DIAGNOSTICS)
E: DTC 21
DIAGNOSIS:
• Airbag control module is faulty.
CAUTION:
• Before diagnosing the airbag system, be sure to turn the ignition switch OFF, disconnect the
ground cable from the battery, and wait more than 20 seconds before starting to work.
• Before replacing the airbag module, roll connector, control module, and sensor, reconnect each
part and confirm that the warning light operates properly.
1 CHECK IF DTC 21 IS INDICATED.
Read Diagnostic Trouble Code. <Ref. to AB-
20, Read Diagnostic Trouble Code (DTC).>
Is airbag warning light trouble code 21 indi-
cated?
Step Value
DTC 21 is not indicated.
AB-40
Yes
Perform clear Replace the airbag
memory. <Ref. to control module.
AB-22, Clear <Ref. to AB-17,
Memory Mode.> REMOVAL, Air-
bag Control Mod-
ule.>
No