Useful Auto Dimming Rear View Mirror Information

**p38arover** · 10th April 2010, 08:03 AM

Originally Posted by Hoges

2 yrs ago I saw some chatter on the RR website that Magna Donnelly were replacing said mirrors free of charge ...mine was not leaking...just wouldn't dim... I thought it was an urban myth but sent a 'nice' email to the lady nominated in the posts on the rangerovers.net website not quite believing it would be extended outside of continental USA.

I didn't do that as I'd heard they'd stopped replacing them.

**Remy** · 10th April 2010, 08:12 AM

They don't do it anymore i tried last year

**andrew e** · 10th April 2010, 09:05 PM

D1 mirrors after 96 also fit. The late d1 ES use the same auto dim mirror as the p38 too.

After 99, LR changed to a bmw mirror, which is common across the BMW range.

When the mirrors leak, they sometimes glue themselves shut so the screen cant be changed.

Tint your windows really dark and you dont need a dimming mirror

**DT-P38** · 11th April 2010, 10:20 PM

You dont happen to have one of those disco mirrors (non auto dim one)lying around anywhere do you andy?

**andrew e** · 12th April 2010, 07:56 PM

Originally Posted by DT-P38

You dont happen to have one of those disco mirrors (non auto dim one)lying around anywhere do you andy?

send bundalene a pm.

Andy

**Tonys** · 15th May 2010, 09:04 PM

Hi Guys,

Does anyone know what the apparently electrical input, which is an incoming platic "tube", behind my rear view mirror is? I apper to have no control, apart from manually adjusting the mirror and yet this would indicate that I have some remote control of adjustment?

**DT-P38** · 16th May 2010, 02:53 PM

I'm not the best source of tech info on these, but my unerstanding is it is the power feeds for operating the auto dim function of the mirror. Your mirror should have a small light (from memory its green when on) and a button on the bottow under the mirror face.

If it doesn't have these, then perhaps your vehicle has had a replacement mirror of standard (read Disco) spec. put on it. I did that to mine until I get around to putting on the new reverse camera - mirror that I bought a while ago. I must say, as with most gadgets, the auto dim function hasn't really been missed...

**Tonys** · 16th May 2010, 08:30 PM

Thanks DT - P38. My mirror does not have a button or light (as per my drivers manual), but I do seem to get a "dimming effect" when driving at night. I see no movement in the rear view mirror, which I assumed created the "dimming effect"?

**81stubee** · 17th May 2010, 08:31 PM

Originally Posted by Tonys

I see no movement in the rear view mirror, which I assumed created the "dimming effect"?

There is no actual physical movement. From my understanding it is similar in operation to an LCD (liquid crystal display) screen. When a current is applied across a liquid that is sandwiched between two glass plates, it changes colour/turns opaque or something. Thus reducing the amount of light that passes through the glass.

In the case of your mirror, there is a LDR (light dependant resistor) on the back that senses the amount of ambient light. The electronics then determine whether its dark, and if it senses that the headlights are on (using one of the wires) and that it is dark enough it will apply a current across the glass, creating the dimming effect. When reverse is selected it clears the mirror so you can see out the back. Pretty clever in my book.

Stu

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