F430 Headlight Washer issue - Help please

Here's the basic diagram for the headlight washer pump:

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Interesting. It looks like the headlight washer pump timer module "LN09" has two power sources (battery and ignition power). Ignition power comes from the same source as the number plates and switchlights (i.e. fuse AF5 and relay AR11). Could the headlight washer pump timer module be faulty? The internals of the module are not shown in detail. Could the key power on pin 5 of the module be shorted to pin 2 of the module, running the pump? The pump uses a 20 amp fuse, so maybe it is too much for the 7.5amp AF5 fuse to handle.

(EDIT: Looks like the timer module is under the dash on the left hand side (next to the Window ECU). I originally thought it was in the luggage compartment)

 

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Strange. That's where the Workshop Manual says it is.

The parts manual was of no help. It says the headlight washer timer is "item 21", but the diagram shows many item 21's (with different part numbers) in numerous locations.

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The wiring diagrams did offer an alternative location: See "LN09" below.

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If the luggage liner is held in with long metal screws, perhaps it has shorted the timer wiring. Have you done any work in this area?

If needed, the earth (masse) for the timer is "GCL8" in the diagram above.

Hope this helps.

 

Sounds promising. Perhaps an internal short. Once you have found a replacement, perhaps you could remove the case from the relay and take some photos of the internals? Maybe there is something obviously broken inside?