Heated screen problem

Hi all, I have a 'S' reg 300tdi Disco. I am lucky to have both a front and rear heated screen, but both have stopped working at the same time, this morning when it was really cold... What one issue may have caused both to go wrong ? Do they share a relay or similar ? The fuse listed for the rear screen is fine. Thanks

Both share the mutifunction unit (MFU) but if that was faulty then there would be other circuits no working such as wiper delays rear fog lamps.

Hi,
Just checked and the rear fogs and wiper delay don't work either. Ordered one on fleabay.
Thanks, really good, precise answer.

You could also have used the MFU function test, something u may wish to do with your replacement unit.

Circuit Operation, Multi-Function Unit
The multi-function unit (MFU) is mounted on the rear of the passenger compartment fuse box 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.

Just stripped mine out. Are the black AMR1280 units interchangeable with the buff AMR 5360 ?

freedom2006 said:

Just stripped mine out. Are the black AMR1280 units interchangeable with the buff AMR 5360 ?

Click to expand...

Not according to previous threads on the subject

Hi. Bought a second hand AMR5360, took just 10 minutes to fit. Perfect job, all works well. Thanks.