190e 16v Lap Timer Screen Replacement Guide
Removing the Lap Timer
Ash tray simply pulls up and out
Remove these two phillips head screws
Now slide out ash tray housing. Be patient and gentle as it may not be terribly willing to come out. But with gentle persuasion it will.
Unplug harness on back of ash tray housing. There will also be a small light bulb that will pull out. It has been removed on my car and is thus not pictured
Now to remove the gauge cluster. No fasteners hold this in. To remove it, pull the cluster straight down an inch or so, then it can be freely pulled out.
Now to remove the lap timer. Unplug the electrical harness. It simply pulls out. Next, undo the nuts. These can be undone by hand. No tools needed. Then remove the gauge mounting bracket and the lap timer will pull out.
Now our lap timer is free. This is my test monkey lap timer, so do not blame him for being in a bit of an ugly state.
Only one tool is needed. This is what I use. It is a very fine flat-blade screwdriver as can be found in most computer tool kits. A small/fine standard flat-blade screwdriver will do fine instead.
The gauge is held together by two tabs on opposite sides of the gauge. The gauge face trim ring is pressed over top of these two tabs. It was hard to get a good picture of this, so I tried to highlight the tab on one side.
The back of the gauge face ring must now be gently pried up to clear the tab. Pry from the side as pictured here to avoid marking/damaging the gauge body. Work slowly, gently, and evenly. I use the gauge body as a fulcrum for prying.
Once the rign has been pried up to clear the tabs, the gauge will now simply pull apart into two halves.
This is what you should then be looking at. Nothing is required to be done to the half on the right. We are only concerned with the half on the left.
Remove these two small flat-head screws
Now lift off the driver board
And you will be looking at this
Remove the clear plastic illumination piece. It lightly holds the thin piece of white paper as shown which simply slides out though it is not necessary to do so.
Here is the illumination piece and its white backing apart. It is not required to separate these two, but just to illustrate...
Now you should be looking at this
Lift off the button extension piece
Now there are two rubber strips resting on top of the screen. Carefully remove them and do not lose them
Now remove the buttons. This is not required, but I would recommend doing so and giving the buttons a good cleaning.
With all 3 buttons removed...
Next remove the thin transparent blue backing screen
Finally, the old screen can be removed
A shot of all of the components removed
Preparing your new screen for installation. IMPORTANT!
Your new screen from us may have a protective vinyl cover with a quality control marking on it. I have not yet decided whether or not to remove this myself as it does protect the screen during shipping. It is easy to check if I have already removed the protective vinyl. The vinyl has a quality control marking on it, resembling a "V" as pictured below. If your screen has this marking, then the protective vinyl cover is present, and you must follow the instruction below. If there is no marking, then I have already performed this step prior to shipping the screen. and you need not worry about this step.
If your screen has the quality control mark and thus, the protective vinyl covering, then follow this step:
IMPORTANT! - You must now remove the static electricity that is likely present on yourself and on the vinyl strip before removing it.
If you do not perform this step, you may irreparably damage the screen when removing the vinyl strip. Do this by grounding yourself, a.k.a. physically touch your fingers to a large bare metal object. Something like a large steel measuring square will be be sufficient. I have a very large stainless steel bowl in the kitchen I use. A stainless steel kitchen sink is also a sufficient ground. Physically touch all ten fingers and the vinyl cover to your ground of choice.
Once you have grounded yourself and the screen, slowly and gently peel off the vinyl cover
All screens I ship will also have a protective vinyl cover on the back of the screen. I recommend leaving this in place. If you wish to remove it, ensure you ground yourself sufficiently before doing so. Leaving it in place will not effect the function of the screen
Installing the New Screen
Fit the new screen to the gauge face.
Place the transparent blue screen on the back of the screen
There is room for the blue screen to move up and down, so just center as best as you can
Next install the illumination piece with its white sheet in place
Now install the slim rubber strips. They will slot perfectly into the illumination piece
Ensure both top and bottom rubber strips are installed
And you should then be looking at this
Install the three buttons
Next install the button extension over top of the back of the buttons
Place the driver board into position
Position the two, small flat-head screws, ensuring their cork washers are in place
Tighten the two screws
Now to align the two halves of the gauge. There are three skinny, long electric prongs that must be aligned with their respective port on the driver board. Be gentle when aligning and joining the two halves. You do not want to bend the prongs.
Once aligned, slide the two halves together
Now the gauge face ring must be pressed back over the tabs on the gauge body. I like to use the round shaft of my screwdriver to do this so as not to damage/distort the ring. It takes a bit of finger strength to do. Just be gentle but firm. The gauge should be firmly held together when done.
And that is it. Now simply re-install the lap timer into your car. Perform the reverse of the removal process to do this, ensuring you reconnect the wiring harness to the ash tray housing.
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Always happy to help