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Joined: Mar 07 2018
Posts: 7

Hi all,
Now my fusebox is on all of the time, no connection issues, it used to drop power when I locked the car .

       When I put my RR P38 4.6 1995 into reverse, on all normal cars the mirror drops to the memory saved position. BUT on my RR the mirror goes UP when I put in reverse.

       I have saved the memory many times and saved the reverse position too many times.   But up it goes instead of down.. It makes me smile when it happens but it is definitely annoying when I am reversing.

      Ideas, gratefully received, otherwise a computer will need to be kicked, expensively .... Although, I would have to think it is the one under a seat, ?

cheers
Neil

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Joined: Dec 30 2015
Posts: 4124

Mirror going up when put into reverse or going down but not returning when you come out of reverse is caused by failed feedback pot in the mirror motor mechanism. Two options, spend a fortune on a replacement mirror or turn the feature off. To turn it off, ignition in position 2 but engine not running, select reverse and press and hold the memory button for two seconds. Then the mirrors won't move when you select reverse but they will stay where they are.

Not sure what you mean by the fusebox being on all the time. Both fuseboxes are going to be powered on some circuits.

Member
Joined: Dec 03 2019
Posts: 15

Well, that's great news...... I thought it was just me! I am sorry for your trouble Neil, I really know how frustrating it can be. I have had the same issue since I fitted a replacement mirror, it was 12 wire instead of 13 and I was told it would work fine, but it does the same,... ie goes the wrong way. And I have now learnt that the memory position can be set which I didn't know, not that that will be any use until I get a fully functionung replacement. Great stuff, thanks lads.

Member
Joined: Mar 07 2018
Posts: 7

Hi all,

Thank you - Lets start at the beginning. The fuse box used to loose power, so every week everything reset, like the windows has to be reset to go up and down automatically.

so, the memory function never worked and if it did, it just got lost all of the time. But, I then took my fuse box apart, cleaned it all and now the power is on all the time and I never loose the memory function. My windows always automatically work and hence the mirror started doing this going up business.

So, looks like I have the wrong mirror stuff inside, I am happy to take this apart, please which bit should I need for passenger (left side mirror) to purchase to get this working as I do love the mirror drop feature, especially as I have not fitted my reversing sensors yet.

Cheers all, stay safe

Neil

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Joined: Dec 30 2015
Posts: 4124

It's a 13 way connector with only 12 ways used. The non-memory mirrors only have a 6 way connector so won't be interchangeable. The motors are connected to pins 3 and 5 (Red and Yellow wires) for the left/right motor, pins 2 and 4 (Grey and Blue wires) for the up/down motor. There are also the two feedback potentiometers with the tracks in parallel connected to pins 10 and 13 (Black/Red and White wires) with the wipers connected to pin 11 (Orange wire) for the up/down feedback and pin 12 (Purple wire) for the left/right feedback. So if 12V is applied to pins 2 and 4 (one way round for up, the other way round for down) with an Ohm meter connected between pins 10 and 11, you should see a smoothly varying resistance as the motor drives the mirror up and down. If you do it could be that the track is disconnected at one end so try the same check between pins 11 and 13.

Chances are you won't see a smoothly varying resistance but one that jumps when it reaches the worn part of the track. It might be possible to rescue it for a while if you can get some contact cleaner into the pot but as it is designed to be exposed to the elements it is a sealed unit so it's unlikely you'll be able to get any cleaner inside it. The only thing you can buy is a complete mirror (at £200+), you can't buy individual components other than the glass.

If you do manage to get it working it'll be a first as I don't know of anyone that has ever managed to fix them. The mirrors are large enough that they can be adjusted so you can see what is behind you and still see the ground behind the car. Many people set their mirrors so the horizon is across the middle of the mirror but as you don't really need to see following aircraft, they can be tilted downwards so you still see what is behind you but see the ground too.

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Joined: Feb 11 2018
Posts: 261

Gilbertd wrote:

It's a 13 way connector with only 12 ways used. The non-memory mirrors only have a 6 way connector so won't be interchangeable. The motors are connected to pins 3 and 5 (Red and Yellow wires) for the left/right motor, pins 2 and 4 (Grey and Blue wires) for the up/down motor. There are also the two feedback potentiometers with the tracks in parallel connected to pins 10 and 13 (Black/Red and White wires) with the wipers connected to pin 11 (Orange wire) for the up/down feedback and pin 12 (Purple wire) for the left/right feedback. So if 12V is applied to pins 2 and 4 (one way round for up, the other way round for down) with an Ohm meter connected between pins 10 and 11, you should see a smoothly varying resistance as the motor drives the mirror up and down. If you do it could be that the track is disconnected at one end so try the same check between pins 11 and 13.

Chances are you won't see a smoothly varying resistance but one that jumps when it reaches the worn part of the track. It might be possible to rescue it for a while if you can get some contact cleaner into the pot but as it is designed to be exposed to the elements it is a sealed unit so it's unlikely you'll be able to get any cleaner inside it. The only thing you can buy is a complete mirror (at £200+), you can't buy individual components other than the glass.

If you do manage to get it working it'll be a first as I don't know of anyone that has ever managed to fix them. The mirrors are large enough that they can be adjusted so you can see what is behind you and still see the ground behind the car. Many people set their mirrors so the horizon is across the middle of the mirror but as you don't really need to see following aircraft, they can be tilted downwards so you still see what is behind you but see the ground too.

thats how mine are set :)

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Joined: Jun 17 2018
Posts: 324

Could never get my head around the feature myself..

It is annoying when reversing a trailer as it ends up pointing at the floor, which is no help..

Been disabled now!!

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Joined: Dec 30 2015
Posts: 4124

The Ascot has it and I also find it annoying. I keep my mirrors set so I'm not looking at the sky and can not only see the road behind me but can also see the ground at the back of the car and the trailer when I've got one on. I suppose it might be different if the mirrors have flat glass in them but both mine are convex so I can see more in them anyway.

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Joined: Dec 30 2015
Posts: 1779

I find it handy when looking for the kerb... but yes is must be a real pain if reversing a trailer.