Fiat 1998 Marea Weekend, Service Manual

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Marea- Marea Weekend
1999 range
Electrical equipment
Air Bag - New features
55.
The sensor consists of a fine, flexible plastic plate that is adhesive on the side in contact with the seat
padding and contains an electrical circuit that controls its operation. The plate covers the entire seat
cushion area except the two sides. It fits between the padding and trim without altering the functional,
aesthetic and ergonomic properties of the seat.
A passenger's presence on the seat is therefore detected even if the passener sits incorrectly and regardless
of whether the seat belt is worn or not.
The sensor is also designed to be compatible with a seat heater (available as an option). If a heater is pre-
sent, the sensor is located underneath it.
The system is adjusted to detect a weight of at least 12 kg under all service conditions (from -35 to
+70°C). For lower weights, the reponse depend on service conditions (temperature, shape and position of
the weight, trim type, presence or absence of a heater.
The passenger presence sensor and its branch of wiring are monitored continually during car use. The di-
agnostic function checks for short-circuits or open circuits.
In the case of sensor malfunction, sensor readings are ignored and the system behaves in the same way as
a conventional system, maintaining the passenger front and side bags active. The red failure warning light
stays on.
ELECTRONIC CONTROL UNIT FOR AIR BAG SYSTEM AND PASSENGER PRESENCE SENSOR
(PPD)
The air bag system fitted to the 1999 range Fiat Marea-Marea Weekend comes with a new electronic con-
trol that differs from the previous system in the addition of a connection to the passenger presence sensor
and the integration of control functions.
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