B1xxx
B1xxx Air Bag Diagnosis Sensor Unit
Description
DTC B1xxx Air Bag Diagnosis Sensor Unit
The air bag diagnosis sensor unit will run DTC check when the ignition switch is turned ON. It has the potential to set many diagnostic trouble codes which will conform to the B1XXX format, but will not match any other SRS diagnostic trouble codes. Refer to [SDT Function (Airbag)] SDT Function (Airbag).
Part Location
Refer to [SRS Component Parts Location] Locations.
DTC Logic
DTC Detection Logic
With SDT
Without SDT
DTC Confirmation Procedure (With SDT)
1. INSPECTION START
Turn ignition switch ON.
GO TO 2.
2. PERFORM DTC CHECK
Check for the DTC on SDT.
Is the DTC detected?
YES
Refer to "Diagnosis Procedure (Component Diagnosis)".
NO
Inspection End.
DTC Confirmation Procedure (Without SDT)
NOTE:
SRS will not enter diagnosis mode if no malfunction is detected in user mode.
1. IGNITION SWITCH
Turn ignition switch ON.
GO TO 2
2. IGNITION SWITCH
After air bag warning lamp lights for 7 seconds, turn ignition switch OFF within 1 second.
GO TO 3
3. WAIT TIME
Wait more than 3 seconds.
GO TO 4
4. REPEAT STEPS
Repeat steps 1 to 3 twice.
GO TO 5
5. IGNITION SWITCH
Turn ignition switch ON.
GO TO 6
6. DIAGNOSTIC MODE
SRS system is now in diagnostic mode and AIR BAG warning lamp flashes. Refer to [Trouble Diagnosis without SDT] Reading and Clearing Diagnostic Trouble Codes.
END
Diagnosis Procedure (Component Diagnosis)
Recheck SRS after each replacement.
1. HARNESS CONNECTOR
Is there any visible damage to the connector?
YES or NO
YES
Replace the harness.
NO
GO TO 2
2. WIRING HARNESS
Is there any visible damage to the harness?
YES or NO
YES
Replace the harness.
NO
GO TO 3
3. AIR BAG DIAGNOSIS SENSOR UNIT
Replace the air bag diagnosis sensor unit. Refer to [Diagnosis Sensor Unit: Removal and Installation] Service and Repair.
GO TO 4
4. RELATED HARNESS
Replace the related harness.
END