Dave,
If your vehicle has an ECU, then it must be JTD.
Therefore I assume 2.0JTD
Wiring details are included in eLearn, which is available from the downloads section. However the two copies of eLearn to which I have access exhibit stupid errors in the pin numbering for the larger connector "A".
The following is from my own CD copy, and may refer to a later variant.
RAD 1 or relay T06 is controlled by a negative from the ECU on relay terminal 85. This signal connects to the engine bay fuseboard via connector/pin A21 on a yellow wire.
Likewise RAD 2, relay T07 control signal enters the fuseboard on A28, on a Grey/Black wire.
The above two signals leave the ECU on A19, and A20 respectively.
Now for the difficult part. Connector A is the larger one, with a total of 81 pins. For the purposes of explanation sketch the connector with 5 large pins at the RHS (arranged like 5 spots on a domino). To the left of this pattern there are 4 rows of 19 pins.
The large upper right pin is 1, with 2 adjacent on the left, and pin 3 in the middle of the domino pattern. These 3 are shown as having thick black (negative) wires attached. The lower two pins of the domino pattern are 4 and 5 counting from the right.
The 76 smaller pins count from the left. Bottom row 6 to 24, then 25 to 43, 44 to 62, top row in sketch 63 to 81. (eLearn has nonesense for the last two rows.)
Pin A20 will be in the middle of the bottom row.
Perhaps this link will help but it is for the 2.8JTD.
http://4cardata.info/elearn/244/2/244000001/244000003/244000005/244003452