Air Bag System: 8B-23
DTC B1021: Front Air Bag Module Deployed
S4RS0A8204028
DTC Will Set when
The SDM detects a frontal 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
Step Action Yes No
1 1) Turn ignition switch OFF. Replace components Go to Step 2.
and perform inspections
Has air bag deployed?
as directed in “Repair
and Inspection
Required after Accident:
”.
2 1) Inspect front of vehicle and undercarriage for signs of Replace components Substitute a known-
impact. and perform inspections good SDM and recheck.
as directed in “Repair
Are there signs of impact?
and Inspection
Required after Accident:
”.
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”
DTC B1024 / B1025: Side-Air Bag (Driver / Passenger) Deployed
S4RS0A8204069
DTC Will Set when
The SDM detects a sideward crash (driver or passenger side) of sufficient force to warrant activation of the side-air
bag system (driver or passenger). (SDM outputs a deployment command.)
Flow Test Description
Step 1: Check that DTC B1024 or B1025 has been set although side-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: ”.