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