intermittent wiper relay

nmckee · Aug 24, 2013

Hi all

I have just found a fault with my intermittent wipers they don't work. The other settings work fine so I have been advised its the intermittent wiper relay but I cant seem to find it.

Dose anyone know were I could find it.

Thanks

Neil

discool · Aug 24, 2013

That;s because u don't have one. The multi function unit looks after all the timing functions the 300 D1 has.

nmckee · Aug 24, 2013

Could that be the problem. if so how would I check

Thank you

discool · Aug 24, 2013

On it own with one circuit failier it's doutful, but there is a test function for the MFU only, not the timed delays, as listed below which is quite spooky with stuff working on it's own.

But other than that there may be an iffy wire/connection going to the delay selector part of the wiper switch.

Circuit Operation, Multi-Function Unit
The multi-function unit (MFU) is mounted on the rear of the passenger compartment fusebox and has an input to operation of the following:

Heated rear screen
Heated front screen
Courtesy lights
Side and headlights
Rear fog guard lamps
Headlamp power wash
Front wipers
Rear wash/wipe

Testing.
================================================== ========

Close all doors and the tailgate. NOTE: If the oil pressure switch goes open circuit (engine is started) during the following procedure, the MFU will exit the diagnostic mode immediately.
Press and hold the heated rear screen switch and switch on the ignition.
Release the heated rear screen switch within 2 seconds and the MFU will beep to indicate that it's in diagnostic mode 1.
Press the heated rear screen switch; the MFU will beep twice. In turn, operate each of the following switches, heated front screen, rear fog guard lamps, side lights, headlights, front wiper, and rear wiper. The MFU will beep twice each time a switch is operated.
Pressing the heated rear screen again will cause the MFU to enter diagnostic mode 2.
The MFU will provide outputs to the following in order given below:
Heated rear screen relay energized for 2 seconds
Heated front screen energized for 2 seconds
Courtesy lights energized for 2 seconds
Dim dip relay energized for 2 seconds
Rear fog guard lamp energized for 2 seconds
Headlamp power wash energized for half a second
Front wiper energized for half a second
Rear wipe/wash energized for half a second
The MFU will then exit the diagnostic mode.

nmckee · Aug 24, 2013

Thanks

Ill give that a try

intermittent wiper relay

nmckee

New Member

discool

Well-Known Member

nmckee

New Member

discool

Well-Known Member

nmckee

New Member

Similar threads