Land Rover Repair: Land Rover Disco 3 wiper washer failure, powerwash, brilliant website

Question
Hi, the front windscreen washer on a 2005 HSE is not working. I am a land rover disco 3 owner. I am a former mechanic who has removed the washer windscreen motor which works when connected directly to the battery.  Fuses and relays under the bonnet have been checked, are there any relays / fuses inside the car which relate to the above not working.  Hoses have been checked and are clear. Headlamp washer is also not working ( pointing toward relay/ fuse?)

Thanks for your assistance.  Its most appreciated.  What a brilliant website>

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Answer
Hi Michael,

sure sounds like a relay problem.  Yes, I there is also a relay in interior footwell.

Here is some info that may help:

Power for the wiper system is supplied by the IDM, which is integral with the passenger fusebox and cannot be renewed as a component. A serial communication link allows communication between the IDM and the BCU.

Control of the wipers and washers is achieved by the following components:
l BCU.
l IDM.
l Front wiper relay.
l Front wash/ wipe switch.
l Variable delay switch.
l Front wiper motor assembly.
l Front washer pump motor.
l Rear wiper relay.
l Rear wiper switch.
l Rear washer switch.
l Rear wiper motor.
l Rear washer pump motor.

Operating the front washer switch with the headlamps switched on energises the IDM, supplying a voltage to the headlamp powerwash relay, which operates the headlamp powerwash pump and increments a counter within the BCU. This counter prevents the headlamp powerwash pump from operating every time the front washer switch activated. Headlamp powerwash is only operational every third front wash cycle, providing the headlamps are The counter resets when the ignition switch is turned off.

Best of luck,

JohnMc