Power mirror retrofit

[66Lover]

Hi all,

I have a 91' 240 with manual mirrors.

I've recently come by a set of power mirrors to retro fit, replacing my manual items. Does anyone have any info on fitting power mirrors to a car originally without? I cant find a wiring diagram anywhere and unsure how they should be wired up, whether i need any relays etc.

Electric mirrors would originally have come with a separate loom. There's several pics floating around online but as all the harnesses are sheathed up, they're not a great deal of help other than with general layout.

Also complicating matters is the fact that the pair of powered mirrors i've picked up are different.... one has a round white plug (i presume an earlier power mirror without heating element) and the other has a black square plug with more wires (heated mirror?)*

I've got a set of adjusting switches but again i've heard there may be different types for power mirror / heated mirror?

Any help would be greatly appreciated,

Graham

[loki_the_glt]

Hi Graham,

According to the Book of Haynes (1991 edition) the mirror wiring diagram is as follows:




Colour codes:
GN - Green
Y - Yellow
W - White
BR - Brown(?) - It's not on the colour key
SB - Black
GR - Grey

There's nothing regarding the heater element wiring, though it should have either a separate switch and relay or be fed from the HRW circuit.

At the very least this should give you a starting point for the conversion.

I can't remember whether they're accessory or ignition live, but the heated mirror glass has two terminals for its wiring so the black plug is for a heated mirror.

[66Lover]

Thanks Loki

Yeah, heated ones use a separate accessory switch and a timed relay. And you're right, the black square 5 wire plug is heated and the white round 4 wire plug is unheated, so I need to decide which direction i'm going in!

Big thanks for the diagram - gives me somewhere to start from.

[cross-Member]

Would you consider selling your manual mirrors when you have changed? I just can't completely make my mind up whether to remove the power ones from my '92 240 or not, otherwise I'd offer them as trade... Sorry.
I'm like that, I like less electrical things.
Not a very helpful post, I apologise.

[DOUGIE68]

I have the loom for the mirrors. ( not for sale) but it is one feed from the fusebox to the switches then off to the round plugs and to the mirrors. No relays.