My favorite add-on - VW Mk3 map light

JPX

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2012 Mazda5 Sport
While cruising the junkyard for various parts my cars have needed (VW Cabriolet trim, Subaru wheel hubs), I ran across these map lights found in Mk3 Volkswagen Jetta and Golf from 1989 to 1993.
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These light assemblies are small and very versatile. I cut off the quick disconnect pigtail as far into the VW's headliner so it is easier to graft to the new target car wiring. My primary use for them is as reading lights for my kids in the back seat. You press the lamp face to turn it on and off.

For my Subaru Legacy, I installed two of these over the rear seat in the headliner. This won many points with the family because the kids could use the lights individually over their seats without having to use the main overhead dome lamp.
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I tied the power for these lights to the rear tail lamp. This allows the lamps to be turned OFF and on with the ignition switch. This method is important since kids don't turn things off by themselves and would inevitably kill the battery. When the key is removed, the lights turn off.

Glare from the assemblies is minimal since the lens generally aims the light to the seat - perfect for reading at night.

I use the original 194 incandescent bulbs since the high power LED bulbs for W5W and 194 are usually too big to fit in this little module.

I obtained another set from the junkyard to install on my NBS Suburban on the third row. The second row already has reading lights on the main dome lamp fixture. But there is no lighting at the third row. A dome lamp exists over the rear cargo area behind the third row - but this is not useful as switchable reading lighting.
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This was tied to the dome light since the GM interior lighting automatically times out after 20 minutes to preserve battery life if left on. This was a huge hit with my kids for the third row where they sit when we are hauling other guests in the second row.

There is not a lot of science to these little lamp assemblies. Once you figure out the wiring for the lights from the existing car wiring, the only decision let to make is where to install the lamp assemblies on the headliner. You can practice the hole cutout shape on a sheet of cardboard. Then you can move on to the real headliner to make the new hole to the correct size. It is a press-in fit, so some precision is necessary - but you would be surprised how much tolerance the lamp assemblies have to their original counterparts.

Which brings me to my latest implementation of these VW Mk3 map lights......I intend to install them on the third row of the Mazda5 I just got. This addressed the least hospitable row in the car with a previous nice upgrade.

The second row benefits from an existing dome light fixture. I might get around to adding yet another set of these assemblies to the second row later. Just need to find another wrecked Mk3 VW to harvest the parts from.

The headliner does not have many places to provide meaningful space between the headliner and the metal ceiling of the Mazda5. So I might stick the second row lamps right beside the existing dome lamp assembly where there is a useful contour to the headliner I can use.

For the third row, the Mazda5 headliner is dead on against the car's ceiling. I have been able to squeeze these assemblies behind the flat headliner on the Suburban - but GM give all kinds of room in the ceiling anyway which may not be as generous on the Mazda5. My intent is to tie the power to the 12V accessory port in the rear cargo area. This allows the lights to be powered on and off with the car key (again to prevent a dead battery if this kids leave the switch on after everyone gets out of the car.

I will post install photos shortly. It costs very little money, yet provides a lot of satisfaction to the occupants in the third row on those long trips where there isn't enough reading light.
 
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Yes!!!

Lotsa how-to pics, please. I want to keep our Mz5 for a long time and this has been one of my biggest peeves in the "why not include this as an option at least" category.
 
The accessory socket (12V cigarette style) at the back left side of the cargo area is where I am pulling the power from.

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Black is ground and the white/black wire is 12V+. These map lights don't pull huge current, so I can tie to the socket wiring without overloading it.

I am struggling with where to place the lamps. I like the idea of using the bump next to the second row dome lamp. But I need to verify the lighting angle in the dark. The challenge is the limited clearance above the third row.....hmmmm.
 
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One of the problems I ran across with LED bulbs to replace the 194 or W5W stock bulbs is that the LED module is too long to fit in the VW light assembly.

Here is a comparison of all the parts.

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I tried out the LED bulbs (Amazon 2pcs 20-SMD T10 12V Light LED from EZ Motoring). They are a bit on the blue side and are comparable in brightness to the original bulbs. There are superior LED bulbs out there - though they do cost a bit more per unit.

This LED bulb just BARELY fits in the Mazda5 front map light sockets. I had to take an sharp blade to the inside of the reflector to clean up the chrome plating and open the hole a bit more. And I took a small nail file to the corners of the LED chips on the bulb to smooth them enough to fit in the reflector. If you try to force the bulb, the base of the bulb will spin and pull the bottom leads out. And of course with any cheapo LED bulb, you have to flip the leads around to make sure the positive and negative leads line up - otherwise the bulb does not turn on.

Back to the VW map lights again.....

Here are the proposed lamp placement positions. 2nd row has the most options. I can't get too close to the sides of the car because of the air bag curtain modules.

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3rd row is a little harder because the clearance for the headliner is limited. The headliner will bulge if I try to cram the lights in a flat spot. This would not be a big deal if the lights were secured to the metal. But since the lights "pop" into the headliner, if the headliner is pushing back, the lamp won't stay in place.

While experimenting with lamp placement last night, I have another option in mind for the 3rd row. Placing the lights in the hard plastic above the cupholder (forward of the rear speaker grill). This creates an effect similar to the cargo light in the hatch area. I need to determine how much clearance is behind that panel and verify if the light position is indeed useful.

More to come.
 
I have WAY too many projects going on at the same time!

But I finally got around to installing the VW Mk3 lights into the Mazda5.

This was pretty straightforward electrically - just tap into the two wires on the accessory port at the rear hatch.

Physically was a challenge - the headliner has MANY obstacles hidden throughout. There are blocks of foam between the headliner and the roof. This made feeding the wires from the dome light area to the rear hatch area a lot more work than I was expecting.

Nonetheless, I got the wire routed. All that I needed to do was cut the headliner with a sharp craft knife. After cutting these two holes, the knife blade was garbage.....gotta love those high tech polymer fabrics. For those feeling squeamish about cutting into the headliner, try practicing on a piece of cardboard or Coroplast.
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I couldn't get the camera to completely capture how the lighting really looks. But my daughter tested the lighting position and confirmed that the lights land exactly where they need to be.
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