D1 heated front screen not working.

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cornish rattler

cornish rattler

Well-Known Member
Posts
6,432
Location
Manc chester
Hi guys

a couple of weeks ago when we had mild frost the heated screen worked ok but now we are having heavy frost in the mornings it doesn't seem to work anymore the missus drives the car aswell and just in case anything has been switched off is there away of switching it back on or has it packed up, i have looked in the hand book but it doesn't tell you anything any ideas.

graham
_________________
98 d1 300tdi auto.
 
Graham I've not got a disco, neither do I have the handbook.

The fault you describe sounds like an electrical fault to me so I'd check the fuses first, then the wiring.

To check these you will need to see in the handbook where the fuses are or get a manual. The latter will come in handy if it's not the fuse so you can see what wires belong to what.
 
Dont forget guys thet the frigging MFU is also involved and it used to have dry joints where it's attached to the back of the fusebox.

It has an autodiagnostic protocol:

Diagnostic Procedure

1. 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.
2. Press and hold the heated rear screen switch
and switch on the ignition.
3. Release the heated rear screen switch within 2
seconds and the MFU will beep to indicate that it's in
diagnostic mode 1.
4. 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.
5. Pressing the heated rear screen again will cause
the MFU to enter diagnostic mode 2.
6. The MFU will provide outputs to the following in
order given below:
 Heated rear screen relay energised for 2 seconds
 Heated front screen energised for 2 seconds
 Courtesy lights energised for 2 seconds
 Dim dip relay energised for 2 seconds
 Rear fog guard lamp energised for 2 seconds
 Headlamp power wash energised for half a second
 Front wiper energised for half a second
 Rear wipe/wash energised for half a second
7. The MFU will then exit the diagnostic mode.
 
Last edited:
:doh: what an idiot just found a switch that you can't see for the steering wheel started the car up and pressed the front screen and the switch lite up :doh: anyway thanks every body for your help i just feel fekin stupid now :eek:

graham
_________________
98 d1 300tdi auto.
 
cornish rattler said:
:doh: what an idiot just found a switch that you can't see for the steering wheel started the car up and pressed the front screen and the switch lite up :doh: anyway thanks every body for your help i just feel fekin stupid now :eek:

graham
_________________
98 d1 300tdi auto.
Click to expand...

Good just as long as stupid doesn't mind :eek:

I feel retribution has been effected and I can now forgive you for the baboon joke. :D :D :D
 
What's an MFU ? I dont think mine has one. it sounds too high tech, especially as you say it beeps. AFAIK the most sophisitcated electronics in my disco appart from the radio is the pcb for the electric windows.:D
 
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