Nissan Altima 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)

    SRS air bag system
    SRS Configuration The air bag deploys if the air bag diagnosis sensor unit is activated while the ignition switch is in the ON or START position. The collision modes for which supplemental r ...

    Passenger seat belt warning system
    System Diagram System Description The seat belt warning lamp (1) will remind the driver if the driver or front passenger seat belt should be buckled. The system works in conjunction with the oc ...

    Other materials:

    B261A push-button ignition switch
    Description BCM transmits the change in the power supply position with the push-button ignition switch to IPDM E/R via the CAN communication line. IPDM E/R transmits the power supply position status via CAN communication line to BCM. DTC Logic DTC DETECTION LOGIC DTC CONFIRMATION PROCED ...

    Small children
    Children that are over 1 year old and weigh at least 20 lbs (9 kg) should remain in a rear-facing child restraint as long as possible up to the height or weight limit of the child restraint. Children who outgrow the height or weight limit of the rearfacing child restraint and are at least 1 yea ...

    B Terminal circuit
    Description The terminal “1” (B) circuit supplies power to charge the battery and operate the vehicles electrical system. Diagnosis Procedure 1.CHECK TERMINAL “1” CONNECTION 1. Turn ignition switch OFF. 2. Check if terminal “1” is clean and tight. Is the inspection result no ...