General
On vehicles with manual seats and seat heaters, the temperature is controlled by a thermostatic switch located in the seat cushion. The thermostat disconnects the power supply when the thermostat reaches 36 degrees C (97 degrees F) and restores the power supply when the temperature is below 26 degrees C (79 degrees F).
Circuit Supply
A feed from the battery positive terminal is connected on an R wire to the engine compartment fusebox where it passes through fusible links 1, 7 and 8. Fusible links 1 and 7 are connected in series.
A feed from fusible links 1 and 7 is connected to the contacts of the auxiliary circuits relay.
A feed from fusible link 8 is connected on an NW wire to the passenger compartment fusebox and from the fusebox to the ignition switch on an N wire.
Ignition switch supply
With the ignition switch in position I or II, the feed from fusible link 8 passes through the ignition switch to the passenger compartment fusebox on an LGW wire.
The feed continues through fuse 26 in the passenger compartment fusebox and is connected from the fusebox on an LG wire to the coil of the auxiliary circuits relay in the engine compartment fusebox. The feed energizes the relay coil, closing the relay contacts. The relay coil is earthed on a B wire, via header C0286 LHD/C0288 RHD, to earth header C0018.
Seat Heating Operation
with the auxiliary circuits relay energized, the feed from fusible links 1 and 7 passes through the relay contacts and is connected to the passenger compartment fusebox on a WG wire where it passes through fuse 15.
From the passenger compartment fusebox, the feed is connected to header C0761 on an LGW wire. From the header C0761, the feed separates into two LGW wires which are connected to the LH and RH seat heater switches.