Discovery Electrics

I am new to the world of Land Rover and have a '97 Discovery ES Diesel.

I have had quite a few electrical/general faults that I could do with some advice on.

A few of the problems I have sorted such as the locks not engaging in the open or closed position by fitting new springs - what a fiddly job! The rear windows also wouldn't work and after removing and resoldering the control unit (is any Landy job easy?) now work perfectly.

I am now left with the following - HELP!

The rear wiper does not work but the washers do. I have tested the switch and there is power in and power out when pressed - also I can hear the relay activating when the button is pressed - any ideas?

The rear sunroof opens fine but only closes when you drive at a reasonable speed?

Lots of dash bulbs don't work - are they all the same type?

I have a second fob but it doesn't work - I have replaced the battery but still no joy - can I reprogramme it or is this a dealer job?

Hope someone can help - thanks in advance.

Welcolme to the forum, tilloumark

The rear wiper will not work if when a door is open, other than that check the you have power to the motor.

A dab of grease on the sunroof tracks may help

Some bulbs are different get yourself a Haynes manual, it's all explained in there.

You can't re-programme your second key fob but you can re-synchronize by pressing the lock button at least four times after replacing the battery. If it's broken then send it off to Remotekey for repair.

get used to faults and things not working properly!!!!!

Thanks - will test the motor and try the grease.

the other thing to do with the rear wiper is search on here for the MFU diagnostics test.. mine stopped working, did the test and it started working again.. for now....

From RAVE

Multi–Function Unit (MFU)
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
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 oper-ated.
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.


Hope this helps

Have tried the MFU test and I don't get the beeps but everything works on it apart from the rear wiper - the ECU for the window has also now died. I soldered a dry joint on it but it has now gone in another 3 places! Anyone know where I can get hold of another? I live in France and scrap yards seem non-existant over here.

MFU's are failry reasonable on ebay but not sure what the postage would be, no idea on window controller but I woudl start in the same place