Update: Through my Ebay auctions, I've found that some people only want
the pigtail harnesses, perhaps for use on the 2-wire variant of these projectors. I'm now offering
them here for $6.
Update: I'm currently developing a new product, a solid-state relay which
powers HID ballasts on an H4 bulb system. This relay would connect to an H4 harness (both positive
and negative switched), and supply battery power to your HID ballasts whenever either low or high
beams are switched on. It will use simple spade connectors, be waterproof, and should be about the
size and shape of a standard automotive relay. There will also be an option to keep the ballasts
powered on a minimum amount of time. If there's any interest, please email me and let me know.
I am offering for sale a controller circuit for Bosch bixenon (or bi-xenon) projectors which use
3-wire solenoid connections (typically found in the BMW E46, M3, and Mercedes CLK). I also sell
3-wire pigtail harnesses for connecting these controllers to the Bosch projectors.
Why They're Needed
Bosch bixenon projectors are commonly found in many European cars, especially the BMW E46, and have
become very popular for retrofitting into different cars' headlights because of their low price,
good reputation for performance in a small package, and ease of use in retrofitting. These
projectors are fairly easy to find on Ebay for
$75-150 per set.
These projectors use solenoids to change the position of a metal shield, so that in one position
it acts as a cutoff to prevent light from blinding oncoming drivers, and in the other position this
restriction is removed for full brightness. The problem is that there are actually two solenoids in
this package, a strong one for pulling and a weak one for holding, and consequently there is a
3-wire connector on the projector. For proper operation, the pull coil is supposed to be activated
for about 1/5 of a second, and then turned off while the hold coil is still powered as long as high
beams are desired. The hold coil alone is not strong enough to move the shield, only to hold it in
the high-beam position. While it is possible to just use the pull coil all the time, powering the
pull coil for long periods of time is not a good idea because it consumes a lot of power, and
consequently generates a lot of heat. The solenoid is not designed to get that hot, so this would
certainly reduce its lifespan a great deal, and it would probably burn out quickly.
Normally, in the E46 car, the solenoids are triggered by a special circuit that is located in the
ballasts which came with that car. If you're using these E46 bixenon ballasts, then you don't need
my circuits at all (go here to see how to use this
functionality), but most people buy these components separately on Ebay and end up using
different ballasts which don't have this extra circuit built-in. So I designed these circuits to
I have seen another circuit on the internet for controlling these solenoids, however this circuit
uses a relay and a capacitor and resistor to achieve the proper delay. While this probably works (I
haven't tried it), I believe my circuit to be better because it uses a MOSFET and therefore has no
moving parts unlike a relay-based circuit, making mine extremely reliable. It is also much smaller,
and could be easily hidden inside a headlight housing or other enclosure.
Specifications This device is shipped as a bare circuit
board with two connectors: one to connect to the solenoid and one to connect to the high-beam
circuit. You may mount these boards anywhere you choose, though it's advisable to mount them inside
the headlight enclosures where they will be protected from the elements. Each unit is fully tested.
Normal orders will be for two units, though you may order a single unit if you wish. For the sake of
reliability and easier wiring, I recommend buying two, one for each headlight.
The only catch for buyers is that they must handle the installation themselves (or hire someone
such as a car-audio installer who knows how to deal with car wiring). But if you're retrofitting
projectors into your headlight housings yourself, you can probably handle this as well. These
circuits are easily wired with only a screwdriver, as the connectors have a cavity where you insert
the stripped wire end, and then turn a screw to clamp it in place.
Compatibility This controller circuit is designed for the
Bosch bixenon projector solenoids normally found in the BMW E46 and other vehicles. It will
interface to any vehicle which can activate high beams with a simple +12V connection.
To make sure your projectors need this device, check the photos below. The left picture shows the
correct E46 solenoid circuit board, which needs a circuit such as mine to control the solenoids. This
variant usually has a solenoid marked "Binder" in black. The right picture shows a different variant
of the E46 projectors, which only has two wires and does not need a controlling circuit. It usually
has a solenoid marked "Kendrion" in red. Notice that the middle pin doesn't go anywhere on the
circuit board on this one.
Warranty This product will come with a one-year warranty.
Since most problems lie in installation, reasonable effort will be given to assist the installer in
diagnosing installation errors if a problem is reported. If the problem is diagnosed to be in a
bixenon solenoid controller unit, the customer will be allowed to send the malfunctioning unit back
for repair or replacement, at my discretion. In this event, shipping charges will be refunded to the
Pricing The price for this bixenon solenoid controller is
$18 for a pair, or $9 for a single unit, plus any applicable shipping charges. If you
purchase using the Paypal button below, it will calculate your shipping and should give you multiple
options for shipping.
Additionally, if you need the 3-wire pigtail harnesses to connect the controllers to your
projectors, I am offering these for an additional $6 per pair, or $3 for a single harness. You can
purchase these by selecting the appropriate Paypal button below. Please see the Installation Instructions page to see how to properly install these.
Shipping Currently, economy shipping by USPS First Class
Mail to U.S. and Canadian addresses is only $1.88, and to most other countries is only $2.69.
For the U.S., there are three shipping options: "standard domestic" shipping is First Class Mail
with Delivery Confirmation, which provides a tracking number; "priority" is Priority Mail with
Delivery Confirmation, and has a tracking number; and "express" is Express Mail which also has a
Outside the U.S., there are two grades of service offered. "Economy international" shipping is
simply First Class Mail, with no tracking, and is the least expensive way I've found of shipping
these controllers to customers all over the world, including Denmark, Ukraine, and Singapore. The
other shipping grade I offer is "express international", which is Express Mail and includes
tracking. If you prefer another shipping service or grade not offered here, please contact me and
I'll do my best to accomodate you.
Payment I currently accept payment by Paypal or by money
order. If you have another online payment method you prefer, please let me know and I'll happily
take a look at it.
Ordering Interested? You can order a pair quickly and
easily by clicking on one of the Paypal links below. If you would like to pay by money order, need
only one or more than two, or have some other special needs, just email me and let me know how I can help you.