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Alfa Romeo 145/146 Electrical System Diagnosis Manual, Volume 3 (1994-2001)01 · 145 electrical system diagnosis
01 · Diagnostics

General description

Make
Alfa Romeo
Model
145/146 Electrical System Diagnosis Manual, Volume 3
Year
1994–2001
Section
Seats › General description
145 electrical system diagnosisGeneral description

GENERAL DESCRIPTION

The front seats are available - for certain markets - fitted with a heating device (comprising two plates located in the cushion and in the seat back) through which it is possible to heat the seat thus eliminating the inconvenience caused in very cold climates when the vehicle is parked outdoors for prolonged periods.

The heating system comprises two resistors operated through a switch and a relay; a thermostat cuts off heating automatically once a certain temperature has been reached.

The control switch for each seat is located one side of the seat itself and it is illuminated.

FUNCTIONAL DESCRIPTION

The seat heater relays I88 (right) and I87 (left) are supplied directly by a special line (fuse F21) and "key-operated" via fuse F4, of the fusebox G1, or fuse F3 of G1 "C".

The two resistances in series of the heating devices O17 (right seat) and O14 (left seat), connected to earth, are supplied by the respective relay with battery voltage. This is energised by the switch B62 (right) and B51 (left) which, as they close, send an earth signal to the corresponding coil.

A thermal contact inside the heaters automatically disconnects the resistances when the temperature exceeds a certain limit (appr. 26°C).

Inside the switches B62 and B51 there are two leds: one lights up when the heater is turned on, the other is illuminated when the side lights are on.

Parts & tools for this job For 1994 Alfa Romeo 145/146

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