Nissan Altima 2007-2012 Service Manual: Symptom diagnosis

SRS AIR BAG SYSTEM

"AIR BAG" Warning Lamp Does Not Turn Off

DIAGNOSTIC PROCEDURE 7

1.CHECK CONDITION OF AIR BAG MODULE

Inspect for any deployed air bag modules or seat belt pre-tensioners.

Are any air bag modules or seat belt pre-tensioners deployed? YES >> Refer to SR-20, "For Frontal Collision" or SR-21, "For Side and Rollover Collision".

NO >> GO TO 2

2.CHECK THE AIR BAG FUSE

Check 10A fuse [No. 2, located in the fuse block (J/B)].

Is the fuse blown? YES >> GO TO 3

NO >> GO TO 4

3.CHECK AIR BAG FUSE AGAIN

Replace 10A fuse [No. 2, located in the fuse block (J/B)] and turn ignition switch ON.

Does the fuse blow again? YES >> Replace harness.

NO >> Inspection End.

4.CHECK AIR BAG DIAGNOSIS SENSOR UNIT

Connect CONSULT-III.

Is “AIR BAG” displayed on CONSULT-III? YES >> GO TO 5

NO >> Visually inspect the air bag diagnosis sensor unit harness connections. If the connections are OK, replace the air bag diagnosis sensor unit. Refer to SR-17, "Removal and Installation".

5.CHECK HARNESS CONNECTION

Check for loose connections between the combination meter and the air bag diagnosis sensor unit.

Are there any loose connections? YES >> Properly connect the combination meter and air bag diagnosis sensor unit harness connectors. If “AIR BAG” warning lamp still does not turn off, replace the wiring harness.

NO >> Replace air bag diagnosis sensor unit.

"AIR BAG" Warning Lamp Does Not Turn On

DIAGNOSTIC PROCEDURE 8

1.CHECK METER FUSE

Check the 10A fuse [No. 4, located in the fuse block (J/B)] .

Is the fuse blown? YES >> GO TO 2

NO >> GO TO 3

2.REPLACE METER FUSE AND CHECK AGAIN

Replace 10A fuse [No. 4, located in the fuse block (J/B)] and turn ignition switch ON.

Does the fuse blow again? YES >> Replace harness.

NO >> Inspection End.

3.CHECK HARNESS CONNECTIONS BETWEEN AIR BAG DIAGNOSIS SENSOR UNIT AND COMBINA TION METER

Inspect the harness and connectors between the air bag diagnosis sensor unit and the combination meter.

Do the harness or connectors have any visible damage? YES >> Replace harness.

NO >> GO TO 4

4.CHECK COMBINATION METER

Disconnect the air bag diagnosis sensor unit harness connectors and turn ignition switch ON.

Does “AIR BAG” warning lamp turn on? YES >> Replace the air bag diagnosis sensor unit. Refer to SR-17, "Removal and Installation".

NO >> Replace the combination meter. Refer to MWI-176, "Removal and Installation".

PASSENGER 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. 4, located in the fuse block (J/B)].

• Check seat belt buckle switch LH.

• Check harness between combination meter and seat belt buckle switch LH.

• Check combination meter. Refer to MWI-94, "Fail Safe".

2.SEAT BELT BUCKLE LH

Fasten the seat belt buckle LH.

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

NO >> • Check seat belt buckle switch LH.

• Check harness between combination meter and seat belt buckle switch LH.

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-10, "Occupant Classification System (OCS)".

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

4.SEAT BELT BUCKLE RH

Fasten the seat belt buckle RH.

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

NO >> • Check seat belt buckle switch RH.

• Check harness between seat belt buckle switch RH and air bag diagnosis sensor unit.

• Replace air bag diagnosis sensor unit. Refer to SR-17, "Removal and Installation".

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