PASSENGER SENSING SYSTEM [TWO-STEP DEPLOYMENT CONTROL SYSTEM]

Purpose

• The passenger sensing system controls the passenger's air bag, pre-tensioner seat belt, and lap pre-tensioner seat belt operation (deployment) based on the passenger seat status signal.

Function

• The passenger sensing system switches the following air bag modules, pre-tensioner seat belt, and lap pre-tensioner seat belt between operable (deployable) standby and inoperable (non-deployable) based on the passenger seat status signal received from the occupant classification sensor.

• For details on the passenger seat status signal, refer to the [OCCUPANT CLASSIFICATION SENSOR [TWO-STEP DEPLOYMENT CONTROL SYSTEM]]. (See OCCUPANT CLASSIFICATION SENSOR [TWO-STEP DEPLOYMENT CONTROL SYSTEM].)

Construction

• The passenger sensing system consists of the SAS control module, occupant classification sensor, and PAD indicator.

• The occupant classification sensor is built into the passenger’s seat.

• The PAD indicator is built into the display screen of the indicator unit.

Operation

Passenger seat status signal indicates adult

1. When the ignition is switched ON (engine off or on), the SAS control module sends (2) a PAD indicator request signal to the instrument cluster based on the passenger seat status signal (adult) (1).

2. The instrument cluster turns the transistor off (3) based on the PAD indicator request signal.

3. When the transistor turns off, the passenger air bag indicator and PAD OFF indicator turn off (4).

4. The SAS control module puts the passenger-side air bag module, passenger-side side air bag module, passenger-side pre-tensioner seat belt, and passenger-side lap pre-tensioner seat belt on operation (deployment) standby.

Passenger seat status signal indicates child

1. When the ignition is switched ON (engine off or on), the SAS control module sends (2) a PAD indicator request signal to the instrument cluster based on the passenger seat status signal (child) (1).

2. The instrument cluster turns the transistor on (3) based on the PAD indicator request signal.

3. When the transistor turns on, the passenger air bag indicator and PAD OFF indicator turns on (4).

4. The SAS control module inhibits (5) operation (deployment) of the passenger-side air bag module, passenger-side side air bag module, passenger-side pre-tensioner seat belt, and passenger-side lap pre-tensioner seat belt.

Fail-safe

• Not applicable