Disco 1 Lost various functions on 98 V8 D1

Today I've lost the following functions. And I was wondering if anyone else had these issues and managed to rectify this.

Rear Demist
Rear fog lights
Rear wash wipe
Intermittent wash at all settings

Plus my seat belt warning light has come on and remains on all the time.

Any help would be appreciated


Craig

Seems u may have a faulty multifunction unit, but do the test first.

Multifunction Unit Diagnostic 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.

I'm having the same problems at the moment, however my interior lights - rear wash wipe - HRW - ignition light are affected. It could be the MFU that is at fault as discool says, however if it is there are 2 versions of it - a black one AMR1280, and a cream coloured one AMR5360. It depends on your VIN. which one you have or just unbolt the fusebox gentley pulling it down and its plugged on the reverse side of the fusebox.

try the fuses, one of them might be blowen

Thanks guys. I have AMR 5360, and a spare unit. Is it easy to swap over? It's my daily driver and electrics scare me... They've started working again but my interior courtesy lights are no longer illuminating.

kurgan said:

my interior courtesy lights are no longer illuminating

Click to expand...

I wish mine weren't, I've got the reverse problem

To swap the box over is a little fiddley to say the least if you've got hands like shovels (like mine).

Firstly disconnect the battery and leave for 20 mins to discharge, then undo the lugs that expose the fuse box under drivers steering wheel.

Once you pull down the hatch you can see the fuse box in the upper right hand side. There are 2 nine mil bolts holding the fuse box in place, one top right, the other bottom right, these need to be removed. (try not to let em drop like I did, searching forever more).

There are at least 2 electrical cables need 'unplugging' from the front of the box to enable you to see the rear of it, they are bloody stiff to get out, but be careful, have patience and they will come out (don't break the lugs that have to be pressed in).

Now you can see the rear of the box you can see the MFU about 60mm X70MM. This again has a cable plugged into it. Again be careful when unplugging and don't break the lugs.

The last bit is to remove the MFU which again is plugged into the fuse box, to do this prise gently the lugs surrounding it and gently remove.

Re-assembly is reverse of the above.

kurgan said:

Thanks guys. I have AMR 5360, and a spare unit. Is it easy to swap over? It's my daily driver and electrics scare me... They've started working again but my interior courtesy lights are no longer illuminating.

Click to expand...

What did the dianostic test show?

I've still got to try diagnostic test, it's been hectic here and trying to stay positive as both my wife and I are now unemployed, she's been out since Sept and I've been out since Feb. Second time in a year for me by the same company!!