Nissan Altima (L32) 2007-2012 Service Manual: Occupant classification system

System Diagram

Occupant Classification System (OCS)

The occupant classification system (OCS) identifies if a child or child seat is present in the front passenger seat. The OCS receives inputs from the occupant classification sensor mat (located inside the passenger seat cushion assembly). Depending on classification of the passenger, the OCS control unit sends a signal to the air bag diagnosis sensor unit. The air bag diagnosis sensor unit uses this signal and the seat belt buckle switch RH signal to determine deployment or non deployment of the front passenger air bag module in the event of a collision. Depending on the signals received, the air bag diagnosis sensor unit can disable the front passenger air bag module completely.

NOTE: In case of customer concern, CONSULT-III can be used to confirm the front passenger air bag status (readiness).

Front Passenger Air Bag Status Conditions

NOTE: Passenger does not meet Occupant Classification System specifications for passenger air bag activation.

1. Seat cushion foam

2. OCS control unit

3. OCS sensor mat

4. OCS sensor mat cell (internal)