I performed a little test during the week on this clicking relay situation. As the computer isn't reporting any fault codes at the moment, I figured it would be a good time to test it. This is what I did:
1. Drove to work in the moring (relay clicking all the while)
2. In the afternoon, I started the car then disconnected the fat red wire connector from the clicking relay. Immediately the 4WD light came on and stayed on the whole way home (35kms)
3. Performed the diagnostics and got code 73 - E-TS/LSD actuator motor (what's ETS?)
4. Cleared the codes, and re-connected the relay wire
5. Started the car and the 4WD light went out, and the relay commenced clicking
6. Performed the diagnostics again, this time with no codes as per before the test, then cleared the codes anyway
Now from this info I deduce that the relay controls the E-TS/LSD actuator motor, therefore a constantly clicking relay signifies a fault with this actuator. Why the 4WD light dosen't come on, and/or the computer dosen't log any codes has got me beat.
I'll let the dealer know about this when I take the car back, and see what they come up with.
Would anyone else like to try this test and see if the result is the same?