[disclaimer] Since I'm leaving my DRLs stock for now, I'm no DRL add/remove expert, so anyone else who's already done this is welcome to jump in here anytime. Meanwhile, I'll help you with the search
process, but expect you to filter through the results. Feel free to skip past anything I've oversimplified. [/disclaimer]
~~~ A Little Background ~~~
As I've come to understand DRLs, it's really just an alternative circuit to the headlights, employing a substantial resistor to drop the voltage enough to allow a dimmer-than-low-beams glow of the headlights. Turning on the headlights energizes a different circuit that bypasses the resistor(s). In your case, I doubt any side effects you might see attributed to unplugging the resistor circuit would apply to your vehicle, since it's presumably running OK.
I'm not sure what your dealer means by
DRL module (inverse or otherwise, because it doesn't matter to a resistor), but many Tundra circuits are apparently controlled via the
ground rather than the
supply side of the circuit, which may account for the emphasis on
inverse. OTOH, if we're talking about one of the many ECUs on board and Tundras have different but specific ones for models with/without DRLs, then let's both hope someone volunteers the relevant details.
While you're at it, if you'd also like to make the DRLs manually switchable,
SolidWiring.com has a solution--one that can also be undone--that's been favorably mentioned here many times.
~~~ Your Assignment ~~~
For now, I suppose the first step is determining:
1) whether the vehicle already had DRLs that were simply disconnected/disabled, or if not,
2) whether the wiring harness and connector(s) are already present, so optimally, you'd just need to add/repair any missing/altered hardware.
Since
disabling DRLs is an oft-repeated topic (the opposite of your objective, but nonetheless useful for now), to keep the results reasonably narrow, begin with the
Search This Forum function found at the far right edge, just above the list of threads from the
forum's top page. It's the one right below the bar reading
Page 1 of ..., not the wider search you'll get if you choose the other Search option found on the bar higher up the page, right below the Tundra Solutions logo.
The key words
DRL and
plug should get you a fairly small list of related threads, where you can pick up enough details to locate the harness and connector on your '05 AC, if they're there. Do that much and respond with the results. We'll proceed from there.