Electrical Diagrams

o�RElectrically Heated Seats:

WIRING DIAGRAM

Electrically Heated Front Seats: Component Location:

COMPONENT LOCATION VIEW

Electrically Heated Front Seats: Component ID:

COMPONENT ID
16 Rheostat, lighting for controls, on dashboard between the steering wheel and driver's door.
22A Fuse board behind the cover flap in the glove box.
64 Heating pads in seat cushion and backrest on driver and passenger seats.
231 Distribution terminal (+54 circuit) in main fuse box behind the glove box.
252 Rheostat for driver's seat heating pad, on dashboard between the steering wheel and centre console.
253 Rheostat for front passenger seat heating pad, on dashboard between the steering wheel and centre console.
254 Temperature sensor for driver's seat heating pad, in the driver's seat.
255 Temperature sensor for front passenger seat heating pad, in the passenger's seat.

8-Pin Connectors
H8-2 Under the right-hand seat.
H8-3 Under the left-hand seat.

Grounding Points
G8 Grounding point, on the stiffening member under the left-hand loudspeaker grille.
G14 Grounding point, left-hand front seat member.
G24 Grounding point, right-hand front seat member.

DESCRIPTION OF OPERATION
Both front seats are equipped with rheostat controlled electric heating.

Heating pads 64 are supplied with current via fuse 10 and switched on and off by temperature sensor 254 in the driver's seat and 255 in the front passenger's seat. The temperature sensors consist of an NTC resistor whose resistance varies with the temperature of the heating pad.

The temperature of the front seat heating pads can be adjusted by means of rheostats 252 and 253. These have four positions: 0-1-2-3. In position 0 the heating is not activated while position 3 gives maximum heating. When the heating pads reach the preset temperature for each position, they are switched off and switched back on when their temperature drops to the lower limit for each rheostat setting.

FAULT DIAGNOSIS HINTS
1. Turn the ignition switch to the Drive position.
2. Check that fuse 10 is intact and that current is supplied to rheostats 252 and 253.
3. Check that there is no open circuit in temperature sensors 254 and 255.
4. Test the heating elements in the heating pads and check that no open circuit has occurred.
5. Check the connectors, wiring harness and ground connections.