Heated rear Window

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aston108

aston108

Active Member
Posts
932
Morning folks,

I've done a search but not found the answer so I thought I'd ask... When I turm my heated rear window on it decideds to turn itself off after a minute or so, I wouldn't mind but it does it before its cleared the window..any Ideas is it on a timer or thermostat of some sort..cheers
 
have yu got air con, or low battery voltage - coz that could be the problem?

Heres a couple of things to help.

discorearscreen2.jpg


discorearscreen3.jpg


the relay is situated in the drivers side footwell and is on the inner Black connector block.
 
hiya... no aircon and I dont think its the voltage as everything else seems ok..can anyone tell me where the ECU is so I can take a look..and is there a way I can bypass it...cheers
 
The HR window doesn't have an ECU it's controlled by a standard relay which is switched by a timer circuit within the multi function unit which also controls the other timed functions in the disco.
The MFU is positioned behind the drivers footwell kick panel
 
hiya, took the kick panel off and saw 2 yellow and one green relay, it the MFU the white object above them ? Also is there a way to test or is it a swap uot job ?
 
I don't know what colour it is but it will have a strip connector by the amount of circuits going there. There is a multi function unit test you can do but it doesn't do a timer test .

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.
 
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