Land Rover Repair: Disco Wipers quit, fuse box, diagnostic capabilities

Question
John,
Yesterday the wipers on my 99 Disco II just quit. I checked the fuse
(OK) and the relay that was in the fuse box - changed out with
another one that had same model number - still no wipers. I do not
hear the motor running either. Is there another breaker or fuse
other than the ones in the box? If not what would be the logical
place to start looking to find the problem? Thanks for your help.

Brian

Answer
Hi Brian,

here's what LR has to say:

<<
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.

Both the Body Control Unit (BCU) and the Intelligent Driver Module (IDM) control the wiper system. The BCU controls the time delay function of the wiper system and is located below and behind the passenger glovebox.

During engine cranking the BCU prevents wiper functions. Two relays are located in the passenger compartment fusebox. The relays control the delay operation of the front and rear wipers. The relays are an integral part of the fusebox and cannot be renewed separately.

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.

The system has diagnostic capabilities through TestBook.
>>

My experience with wipers is that if the relays check out fine and the wiper does not work, its usually the motor.  In my case, I replaced the motor and its worked ever since.

Here are some fuses to check inside the footwell of your Disco:

F15, F18, F19*, F23 and F29.  Pay close attention to F19 as it is key to the wipers.

Best of luck,

JohnMc