8B-28 Air Bag System:
DTC B1021: Air Bag Module Deployed
S5JB0A8204014
DTC Will Set when
The SDM detects a crash of sufficient force to warrant activation of the air bag system. (SDM outputs a deployment
command.)
Flow Test Description
Step 1: Check that DTC B1021 has been set although air bag has not been deployed.
Step 2: Check that DTC has been set due to failure of SDM.
NOTE
Before executing items in this flow, be sure to perform “Air Bag Diagnostic System Check”.
DTC Troubleshooting
NOTE
Upon completion of inspection and repair work, perform the following items.
• Reconnect all air bag system components and ensure all components are properly mounted.
• Repeat “Air Bag Diagnostic System Check” to confirm that the trouble has been corrected.
• Clear DTCs of BCM referring to “DTC Clearance in Section 10B”
Step
Action
Yes
No
1
1) Turn ignition switch OFF.
Has air bag deployed?
Replace components
and perform inspections
as directed in “Repair
and Inspection
Required after
Accident”.
Go to Step 2.
2
1) Inspect front of vehicle and undercarriage for signs of
impact.
Are there signs of impact?
Replace components
and perform inspections
as directed in “Repair
and Inspection
Required after
Accident”.
Substitute a known-
good SDM and recheck.