Nissan Sentra Service Manual: Seat belt warning system

Seat Belt Warning System Does Not Function

1.SEAT BELT WARNING LIGHT

Turn ignition switch ON.

Does the seat belt warning lamp come ON? YES >> GO TO 2.

NO >> • Check 10A fuse [No. 8, located in the fuse block (J/B)].

• Check seat belt buckle switch (driver seat)
• Check harness between combination meter and seat belt buckle switch (driver seat).
• Check combination meter. Refer to MWI-25, "Fail-Safe".

2.SEAT BELT BUCKLE (DRIVER SEAT)

Fasten the seat belt buckle (driver seat).

Does the seat belt warning lamp go OFF? YES >> GO TO 3.

NO >> • Check seat belt buckle switch (driver seat).

• Check harness between combination meter and seat belt buckle switch (driver seat).

3.OCCUPANT CLASSIFICATION SYSTEM

Have a helper sit in the passenger seat.

Does the seat belt warning lamp go ON? YES >> GO TO 4.

NO >> • Check occupant classification system. Refer to SRC-12, "OCCUPANT CLASSIFICATION SYSTEM : System Description".

• Check harness between occupant classification control unit and air bag diagnosis sensor unit.

4.SEAT BELT BUCKLE (PASSENGER SEAT)

Fasten the seat belt buckle (passenger seat).

Does the seat belt warning lamp go OFF? YES >> System OK.

NO >> • Check seat belt buckle switch (passenger seat).

• Check harness between seat belt buckle switch (passenger seat) and air bag diagnosis sensor unit.

• Replace air bag diagnosis sensor unit. Refer to SR-28, "Removal and Installation".