So, the headlights:
For anyone not familiar with the DOT Volvo Bi-Xenon Headlamp units, here's what they look like.
Attachment:
R headlight DOT.png
I've highlighted the daytime running light. For the Euro market, this lamp is used as a high beam: there is no fresnel in front of the reflector, the reflector is properly silvered, and the bulb is an H7 or H9 or some proper high beam bulb. For North American cars they repurposed this lamp to a DRL, which they dimmed by painting the reflector silver and they diffused by installing the fresnel, and they used a 9006XS bulb.
The main lamp is a 35w D2R HID bulb and the whole reflector tilts up and down as commanded by the high beam switch. It doesn't re-focus to intensify the beam for long distance, it just points the low beam up higher. The result is a higher, wider, and vastly DIMMER light pattern.
There is also a height adjustment tied to the 4C suspension that can be run through a self-calibration procedure in VIDA, but at the end of it the headlights are usually pointed down too far. They can then be raised up to be somewhat useful on low beam, but the high beam is still terrible.
The car is communicating to the headlights in a number of ways: First, the level sensor is expecting to see that motor. Next, the high beam circuit is expecting to see that motor. Third, the DRLs are expecting to see the 9006 bulb, though apparently this can be changed using VIDA so that DRL duties are handled by the Xenon bulb. It's also reported that the car still retains the high beam circuit used in Europe-land, but it's not hooked to anything in the North American cars aside from the solenoid that tilts the reflector. Apparently it's "not possible" to reprogram the car to expect to see Halogen lights versus the Xenons (I'm dubious of this claim, but proceeding as though it's fact for now).
The most direct option, simplest, but the most expensive one, is to have a set of European headlights shipped over and change the car's DRL mode. This will cost in excess of $1k by the time the lamps are shipped. This gets you an improved low beam pattern and a reasonable high beam that can be upgraded with LED, HID or whatever hot rod Halogen bulb you like.
Exploring other options:
- Install Halogen lamps, reprogram the DRLs, and either reconfigure the car's brain or the wiring to drive the halogens. This may throw a code for the auto leveling, but if the leveling motor is pirated from a set of junkyard Xenons I may be able to confuse the computer into thinking they're still intact. (Installing Euro Halogen lamps is an option once the configuration is perfected, about half the price of Euro Xenons and not much less difficult to replace).
- Upgrade the Xenon high beam, reprogram the DRLs. This requires disassembly of the lamp, sending the high beam reflectors to Michigan to have them treated, and removing the fresnel. Then yadda yadda with the bulbs. It's been done a few times by other folks with decent results, and no codes.
- Retrofit a bi-xenon projector into this housing. This gets a fabulous low beam but (in my experience) a marginal high beam. Both low and high beam are improved over the stock part, and no codes are thrown since the DRLs and height adjusters remain intact, and the circuit to operate the high beam solenoid is repurposed to operate ... the high beam solenoid. I hate bi-xenon projectors though, and a retrofit version is hanging way off balance so I am not sure how long it'll live.
- Install a light bar behind the grille. Should work, not cheap, a pain to aim, a pain to clean.
The Halogen lights I grabbed are from an '06, so have the clear plastic lenses versus the fluted glass lenses of the -04 cars. These use an H11 low beam bulb and an H9 high beam. The H11 is just a low-wattage H9 with a slightly different mounting tab and electrical plug, both of which can be modified to install an H9 into the H11 lamp. The H9 also doesn't have the paint shield on the bulb but the Volvo lamp has a glare shield built in, so glare probably won't be a problem. H11 = 55w 1325 lumens, H9 = 65w 2100 lumens. I've been extremely happy with the S-V.4 LED bulbs (36w, 3600 lumens) in my Saab so I wouldn't have any hesitation of installing them in the high beams of any of my cars. As low beams they're also excellent but I'm not sure I'd install them into a DOT pattern lamp. Retrofitting an Halogen projector into the low beam would be an upgrade possibility, and I know these LED bulbs work magnificently in a projector.
Here they are alongside a set of high/low Halogen projectors in my stash:
Unfortunately both the low beam bulbs in the lights I grabbed are blown, and I have no others, so I can't power them up to see how good/bad they are. That they have a proper low and high beam, plus a city light (cool!), and they're not terrible looking (like the -04 ones with the black surrounds). They're also not horrendously uncommon so if one gets damaged they're easily and cheaply replaced.
So that's what I know at this point. Again, I'm not acting on anything until I have worked down to this level on my priority list.