Operation CHARM: Car repair manuals for everyone.

B1018




B1017 - B1022 Occupant Classification System

Description

DTC B1017 - B1022 OCS

The OCS control unit is wired to the air bag diagnosis sensor unit. The air bag diagnosis sensor unit will monitor the OCS for failures and interruptions in communication between the OCS control unit and the air bag diagnosis sensor unit.

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 [Diagnosis Sensor Unit: Trouble Diagnosis without SDT] Warning Lamp Flash Code Chart.


END

Diagnosis Procedure (Component Diagnosis)

Recheck SRS after each corrective action.
1. CHECK CURRENT DTC

Does SDT indicate B1018, B1019, B1020 or B1022?

YES or NO
YES
GO TO 2
NO
GO TO 13

2. HARNESS CONNECTOR

Is there any visible damage to the OCS sub-harness connector (DTC B1022) or to the belt tension sensor connector (DTC B1019)?

YES or NO
YES
Replace the harness.
NO
GO TO 3

3. WIRING HARNESS

Is there any visible damage to the body or seat sub harness?

YES or NO
YES
Replace the harness.
NO
GO TO 4

4. CHECK CURRENT DTC

Does SDT indicate B1022?

YES or NO
YES
GO TO 5
NO
GO TO 6

5. OCS CONTROL UNIT HARNESS CONNECTOR

Is the OCS control unit or body harness connector disconnected?

YES or NO
YES
Connect the harness. Clear the DTC.
NO
GO TO 13

6. CHECK CURRENT DTC

Does SDT indicate B1018?

YES or NO
YES
GO TO 7
NO
GO TO 8

7. OCS SENSOR HARNESS CONNECTOR

Is the OCS sensor harness connector disconnected?

YES or NO
YES
Connect the harness. Clear the DTC.
NO
GO TO 8

8. CHECK CURRENT DTC

Does SDT indicate B1020?

YES or NO
YES
GO TO 9
NO
GO TO 10

9. BELT TENSION SENSOR

Inspect the belt tension sensor, belt tension sensor connector and harness.

Are the inspection results normal?
YES
GO TO 10
NO
GO TO 12

10. CHECK CURRENT DTC

Does SDT indicate B1019?

YES or NO
YES
GO TO 11
NO
GO TO 12

11. BELT TENSION SENSOR HARNESS CONNECTOR

Is the belt tension sensor harness connector disconnected?

YES or NO
YES
Connect the harness. Clear the DTC.
NO
GO TO 12

12. REPLACE RH FRONT SEAT BELT ASSEMBLY

Replace the RH front seat belt assembly.


GO TO 13

13. REPLACE RH FRONT SEAT CUSHION ASSEMBLY

Replace the RH front seat cushion assembly. Refer to [Front Seat: Removal and Installation] Front Seat Removal and Installation.


GO TO 14

14. AIR BAG DIAGNOSIS SENSOR UNIT

Replace the air bag diagnosis sensor unit. Refer to [Diagnosis Sensor Unit: Removal and Installation] Service and Repair.


END.