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Old 09-05-2007, 08:29 AM   #1 (permalink)
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Default Mfu.........

95 Classic. I am hoping (not sure why but I am) that my problem is in part due to the MFU (AMR1208). The MFU seems to be on the back of the main fuse block. Is there an "easy" way to get to it to check that it is indeed providing the power to 87A on the EAS delay timer (AMR1111) or is it a struggle? Something I read made me think that MFU failures are not all that uncommon??

Still not sure of the locations of the relays for the interior lights delay and the theft alarm? Such fun.
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Old 09-05-2007, 08:46 AM   #2 (permalink)
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First do this.

This also applies to Discovery with the differences noted.

Switch ignition "off"
Press and hold rear defrost switch then switch on ignition (position 2)-release defroster switch (Note: Release the defroster switch within one second of turning on ignition).
A series of beeps indicates that the MFU is in diagnostic mode.
Perform input checks by operating the following switches/controls. A correct input is indicated with a two beep tone.
Windshield defrost (Classic only)
Rear window defrost
Open and close doors and tailgate
Operate parking/headlamps switch
Wiper switch in intermittent position
Windshield/headlamps wash switch
Rear wiper switch
Drivers seat belt latch
Rear fog lamp switch ('97 Discovery only)

With the system still in diagnostic mode, press and release the rear defroster switch again - now the MFU will provide output signals to the components which will then operate


Rear window defroster and dash indicator lamps
Interior lamp
Headlamp wash (not Defender)
Front and rear wipers
Chime and seat belt indicator lamps
Rear fog lamps ('97 Discovery)
Windshield heater ('95 Classic)


This was a bunch of fun, because you can have the headlight washer sqirt 4 second from walking away from the car. We used to "zap" each other all the time...

"Hey,tap the headlight for me, I'm looking for a short....."
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Old 09-05-2007, 08:48 AM   #3 (permalink)
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Before you go nuts with all that, are you sure your door pins are working properly? Especially the rear tailgate one, its very common and costs about 5 bucks from the dealer (seriously). If one pin is messed up, none of that stuff will work properly (EAS, Alarm, dome light, etc).
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Old 09-05-2007, 08:53 AM   #4 (permalink)
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This test will check the switches. It will beep when you open and clsoe the door.
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Old 09-05-2007, 09:59 AM   #5 (permalink)
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Default Wow....thanks will try it in just a few minutes!

And that will check the pins and all that. Great. It has been one of those adventures so I would love it to be simple from this point on!
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Old 09-05-2007, 12:06 PM   #6 (permalink)
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Default MFU test results....

Did the test a few times, interesting.

Results:

No light when pressing Windshield defrost.

After pressing the rear defrost switch for the third time the Windshield defrost switch light did light up, then the rear window defrost and so on as it worked thru the tests. (it also lights up when you press it with the engine running but not sure if it is really working...have my doubts.

Everthing else seemed to test proper.

So now what? The two other items on the wire that goes to pin 87A on the EAS delay relay are the Window lift ECU and the theft alarm. Any guess on what one of those might be feeding power out when it shouldn't? Got a general idea of their location but have not found them yet
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Old 09-05-2007, 12:40 PM   #7 (permalink)
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If you need a MFU for the 1995 RRC. I have a new one. If it works send me some money. if it doesnt work for you. send it back.

Kevin
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Old 09-05-2007, 03:36 PM   #8 (permalink)
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Let me run a few more tests tonight and I will let you know.
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Old 09-07-2007, 10:03 PM   #9 (permalink)
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Did the MFU test and the Theft Alarm test. I have part of the book info on the Theft Alarm test but not what it mean, like some of the flow charts. The Theft Alarm test went right except the started was not disabled. While still in the test mode it seemed very happy to crank and start. Tried to look at the book to see what that means but didn't find anything yet??

MFU test: In the first part I when I pressed the windshield heat I did not get a light. However when in was in the second part of the test the Windshield Heat switch did light up. Bad switch or ?? Does the MFU test do the either of the two hood switches?? Didn't check it. Is the MFU test somewhere on the Heritage CD??
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