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S80 2001 Auto Dimming Rearview Mirror Repair How To (long)

Help, Advice, Owners' Discussion and DIY Tutorials on the Volvo S80 model. Sometimes called an "executive car", the S80 was and continues to be Volvo's top-of-the-line passenger car.
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vegasjetskier
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S80 2001 Auto Dimming Rearview Mirror Repair How To (long)

Postby vegasjetskier » Wed Aug 27, 2008 3:38 am


PLEASE READ THIS FIRST

The original images sadly disappeared one day.

Please use this PDF if you'd like to download a different writeup on this procedure. The author is unknown, so if you're the PDF author, and want attribution or for me to remove it, please contact me and I'll do that.

The images in this MVS Forums topic are from that PDF because the original images are gone from the free image hosting service's servers. Please don't use those services here if you upload a photo.

I removed all the broken links from those and added all the images extracted from the PDF, but the ordering won't be exact, so keep that in mind.

Matt, March 2016


Does your auto dimming rearview mirror look like a sickly lava lamp? Here's how to fix it.

My auto dimming rearview mirror has not worked since I bought the car about 3 years ago. I put some electrical tape over the bad spot, but it just kept getting worse until I couldn't stand it anymore, so I decided to fix it. Here's what it looked like:

I talked to my local Volvo dealer to see how much it would cost for a replacement. $580 for the part (because it has a computer in it, believe it or not), $41 for programming (because it won't work on my car unless they program it too), plus labor for a mechanic (because I can't change it myself). Total? $700 +.

I saw on another form where a guy changed out just the glass and it worked on his car, so that's what I did on mine (thanks to Rick Good for his help). I ordered a used mirror from http://www.vandsautodismantlers.com, for $80, then went to work. With this method you don't need the dealer or the programming because you keep the computer section and just change out the bad mirror glass.

Tools required: T-30 Torx bit, jeweler's screwdriver, 10mm socket and wrench, needle-nosed pliers, heat gun, soldering iron, plastic putty knife.

To remove the old mirror from the car, first disconnect the battery negative cable and wait 10 minutes.

Use a small screwdriver to pry the rear of the center trim down:

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Pull the rear of the trim down and pivot it forward:

Push the two plastic cover retaining clips to the side:

And remove the cover:

Remove the two 10mm bolts holding the mirror mount:

Now release the mirror and light housing from the headlliner by turning the two rotary catches downward:

And pushing the six clips toward the center of the car:

Pull the ground connector loose:

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And remove the housing from the headliner. Let it hang by the wiring.

Use the T-30 Torx bit to remove the mirror retaining screw from the top of the mirror/light housing. Be sure to hang on to the cone-shaped lockwasher:

Now the mirror will be hanging from its wiring. Pry the back cover off the mirror:

Now remove the wiring retaining spring from the back of the mirror:

Use the jeweler's screwdriver to push up the catch on the wiring plug, then push it out the back of the mirror:

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You now have the mirror loose. Take it over to a workbench and remove the front cover by inserting the jeweler's screwdriver and depressing the catches along the seam at the following points:

And the cover will come off with the computer and mirror in it. Release the plastic clips holding the photo sensor board in the top of the front cover. Be very careful not to break off the photo sensor from the back side of the board or to put too much stress on the ribbon wires. Remove the mirror/computer combo from the cover:

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Unsolder the two wires from the mirror glass at the posts as shown by the yellow arrows in the following pic:

AutoDimmingRearViewMirrorComputerBoardWiresToUnsolder.jpg


Repeat the separation steps for the junkyard mirror. You might want to mark the computer from your car so that you don't get it mixed up the junkyard computer since it won't work in your car.

A piece of double-sided tape holds the computer on the back of the mirror. Draw a line around the computer board on the junkyard mirror (the one you're going to put in the car) so that you can position the computer from your car on it correctly (if you don't, the light sensor for the front of the mirror won't line up correctly).

Do this next part very carefully. You don't want to crack the computer circuit board! Now use your heat gun sparingly to heat the mirror and work the plastic putty knife between the glass and the computer circuit board. On the junkyard mirror I heated the computer side and worked the putty knife in between the computer and the tape to preserve the tape as much as possible. On the mirror from my car I heated the glass side and worked the putty knife in between the tape and the mirror to prevent heat damage to the computer. When I got them apart the tape easily peeled off the back of the computer.

Now heat the surface of the double-sided tape on the good mirror and stick your car computer board on it making sure that it fits within the lines you drew earlier. Hold it down until the tape cools. Solder the mirror wires to the computer board prongs. Snap the photo sensor board into the mirror cover, insert the mirror/computer combo into the cover, then snap the housing onto the cover.

Reassemble the car reversing the steps above. Don't forget to connect the ground wire and secure the two rotary catches at the top of the mirror/light housing. Reconnect the battery negative lead and enjoy your "new" mirror. You just saved about $600.

I'll post this in the repair database.


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Last edited by vegasjetskier on Wed Aug 27, 2008 1:28 pm, edited 6 times in total.
.

SOLD - 2001 Volvo S80 T6: Mobil 1 Oil & Synthetic ATF, Brake Performance drilled and slotted front rotors, Akebono Euro Ceramic pads and Yokohama Avid V4S tires, 91K miles.

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MadeInJapan
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Postby MadeInJapan » Wed Aug 27, 2008 3:48 am

Wow, thanks for the great post w/ pictures. I suppose this would work for other models as well.
'98 S70 T5 Emrld Grn Met/Beige Tons of Upgrades Mobil-1
'04 V70 2.5T Red/Taupe Some Upgrades Mobil-1
'07 S40 T5 AWD 6 speed manual! Silver/Black Stage1 Heico & Elevate
'07 S60 2.5T Blue/Taupe- my kid's Volvo

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Postby VCA » Wed Aug 27, 2008 12:08 pm

MadeInJapan wrote:Wow, thanks for the great post w/ pictures. I suppose this would work for other models as well.

Dave, this should work for any car with the Magna Donnelly UEM mirror (all P1 cars through MY 2008, except C70, S40 (-04), and C30 [Delphi UEM]; and all P2 cars through MY 2008.
2008 S80 T6 AWD
1999 S70 GLT

Responsible for the care of a '92 960 and an '07 S60R

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Postby JRL » Sat Aug 30, 2008 10:51 pm

VCA wrote:
MadeInJapan wrote:Wow, thanks for the great post w/ pictures. I suppose this would work for other models as well.

Dave, this should work for any car with the Magna Donnelly UEM mirror (all P1 cars through MY 2008, except C70, S40 (-04), and C30 [Delphi UEM]; and all P2 cars through MY 2008.


It should!
Great post, you may be the 1st to do this
2000 V70R Black, 129,000 miles (Wife's R, getting up there, she won't sell it)!
2007 XC70 White/Oak over 100K perfect. New DD, sold the 06
2000 V70R Silver, 36,200 miles!!! SOLD (I will regret this)!

Contact info for purchases: jrl1194 (at) aol (dot) com

MadeInJapan
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Postby MadeInJapan » Sat Aug 30, 2008 11:02 pm

JRL wrote:Great post, you may be the 1st to do this


Yes, I think he is!

Many an owner has bought "replacements" on the web (ie: eBay) just to find that the entire unit is involved in the car's security system among others and then were in despair when their car wouldn't even start (if I recall correctly). They then went to the dealer for a true replacement and software download- for mega bucks (seems I remember about $6-800, depending), so this truly is a giant leap forward for those who have problems out of that dimming mirror which is actually much more than just a mirror.
'98 S70 T5 Emrld Grn Met/Beige Tons of Upgrades Mobil-1
'04 V70 2.5T Red/Taupe Some Upgrades Mobil-1
'07 S40 T5 AWD 6 speed manual! Silver/Black Stage1 Heico & Elevate
'07 S60 2.5T Blue/Taupe- my kid's Volvo

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Re: S80 2001 Auto Dimming Rearview Mirror Repair How To (long)

Postby Mandrake » Sat Nov 15, 2008 2:08 am

I did each step exactly as shown, put the mirror back in the car and now the sunroof and interior lights will not work from the control unit attached to the mirror. I checked the fuses they seem fine. Any idea what may be wrong. Thanks Mike.

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Re: S80 2001 Auto Dimming Rearview Mirror Repair How To (long)

Postby vegasjetskier » Sat Nov 15, 2008 3:19 am

Mandrake wrote:I did each step exactly as shown, put the mirror back in the car and now the sunroof and interior lights will not work from the control unit attached to the mirror. I checked the fuses they seem fine. Any idea what may be wrong. Thanks Mike.


Did you make sure you used the old mirror computer? Did you disconnect the battery first? Are all the connectors pushed all the way together? Did you attach the ground strap?

You might need to lock and unlock the car with the remote to activate the mirror computer module.
.

SOLD - 2001 Volvo S80 T6: Mobil 1 Oil & Synthetic ATF, Brake Performance drilled and slotted front rotors, Akebono Euro Ceramic pads and Yokohama Avid V4S tires, 91K miles.

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Re: S80 2001 Auto Dimming Rearview Mirror Repair How To (long)

Postby Mandrake » Sat Nov 15, 2008 3:01 pm

Yes to all of those. I even marked all the old and new mirror parts before I began to take everything apart. Just to make sure I didn't switch up the pieces. I'll try locking and unlocking the doors and see what happens. Thanks for the help. Mike

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Re: S80 2001 Auto Dimming Rearview Mirror Repair How To (long)

Postby Mandrake » Sat Nov 15, 2008 3:08 pm

OK I locked the car and unlocked it. Everything works fine and the mirror is dimming like it's supposed to. Thanks for the help and thanks for saving me a bundle of money. Question, why did I have to lock and unlock the doors, what does that do to make it work? Thanks again Mike.

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Re: S80 2001 Auto Dimming Rearview Mirror Repair How To (long)

Postby vegasjetskier » Sat Nov 15, 2008 9:30 pm

Mandrake wrote:OK I locked the car and unlocked it. Everything works fine and the mirror is dimming like it's supposed to. Thanks for the help and thanks for saving me a bundle of money. Question, why did I have to lock and unlock the doors, what does that do to make it work? Thanks again Mike.


I don't know other than it resets the Upper Electronic Module (the computer in the mirror). Glad it's now working for you.
.

SOLD - 2001 Volvo S80 T6: Mobil 1 Oil & Synthetic ATF, Brake Performance drilled and slotted front rotors, Akebono Euro Ceramic pads and Yokohama Avid V4S tires, 91K miles.

Help this site: Amazon.com link, Tirerack.com link, Donate


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