B1057
B1049 - B1052, B1054 - B1057 Driver Airbag Module
Description
DTC B1049 - B1052, B1054 - B1057 Driver Airbag Module
The driver air bag module is dual stage and wired to the air bag diagnosis sensor unit through the spiral cable. The air bag diagnosis sensor unit will monitor for opens and shorts in detected lines to the driver air bag module including the spiral cable.
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. CHECK SPIRAL CABLE CIRCUIT
1 Turn ignition switch OFF.
2 Disconnect driver air bag module harness connectors and spiral cable harness connector.
3 Check continuity between driver air bag module harness connector and spiral cable connector.
4 Check continuity between driver air bag module harness connector and ground.
Is the inspection result normal?
YES
GO TO 4.
NO
Replace the spiral cable. Refer to [Spiral Cable: Removal and Installation] Service and Repair.
4. 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 5
5. DRIVER AIR BAG MODULE
Replace the driver air bag module. Refer to [Driver Air Bag Module: Removal and Installation] Driver Air Bag Module.
GO TO 6
6. RELATED HARNESS
Replace the related harness.
END