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