Smart Warning Lights; Changing Bulbs - Fiat 1998 Marea Service Manual

Electrical system
Protection and security devices
55.

SMART WARNING LIGHTS

For the "Air Bag" and "ABS" functions, the ordinary warning lights have been replaced by an electronic
circuit which performs a SMART WARNING LIGHT function.
- the indicator comes on upon a signal from the control unit, which produces a fault or alarm signal;
- the indicator comes on even when a mis-connection or short-circuit to earth is detected between con-
trol unit and panel. This function is carried out by the small circuit shown in the figure. The warning
light is led D2 and it comes on when an earth signal is received from control unit (1) or if the connec-
tion is broken or s.c. to earth.
On some outfits, the ABS and Air Bag systems are suppied as options. If these systems are NOT fitted to
the car, the built-in circuit will indicate a continuous fault because it is not connected to a control unit.
Parallel to led D2 are fitted bulb socket (A) for the ABS system and bulb socket (B) for the Air Bag sys-
tem:
- if these systems are present, a white plug is fitted to these sockets and the circuit works normally;
- if one of the two systems is NOT present, the plug is replaced by a bridge (T) that short-circuits the
warning light.

CHANGING BULBS

The control panel consists of a single built-in component supplied as one part.
It is nevertheless possible to replace some warning light bulbs via their bulb holders. These come in three
types:
- holders indicated by (C) - red, 2 W - these light the control panel;
- holders indicated by (D) - black, 1.2 W - these refer to the odometer display lighting ;
- holders indicated by (E) - allow replacement of the main beam warning light bulb
62
Marea- Marea Weekend
D1 protection diode
D2 warning light
R1, R2 charging resistances
1
control unit
2: circuit built into warning light
'99 range
Publication n° 560.763/19