Taken from elsewhere but written by me
Here is the layout of the your fusebox with relays: -
Here is the circuit diagram for the rear heated window defogger: -
peterandjenny said:
another site mentions that the same relay does the rear screen and heated seats but still unsure which one :head:
This depends whether you have an early production car or late production car. My car is a 1.9 1998 (feb build - early build) and robert has a 1.9 1999 (late build), the change over date is somewhere in between.
Unloader Relay
Early Production cars the unloader relay is for the heated seats and not for the rear window defogger.
Late production cars the unloader relay is for the rear window defogger and not for the heated seats.
There was a design change in the switch types, it seems that this was not just for cosmetic purposes, the pre-post swich types will have significantly differant amperage ratings.
The unloader relay is a 4 pin change over relay with terminal nos 30, 85, 86 & 87. I was unable to find referance to an exact part number when looking for my relay, when looking at realoem, I could only find one relay with the correct terminal numbers which is part 3 below.
(pins 85 & 86 are the relay coil, Pin 30 and 87 are the contact pair, pin 30 being the supply from Fuse 6, 20amp)
I searched on ebay and found
this with the discontinued part number and
this with the current part number.
The above links to ebay show the differant colours were simply because of a part number change, this maybe reflected a differant rating. The orange relay is 30amps, not sure what the light blue unit is.
HTH
Brian