Acura mechanics received their first Technical Service Bulletin (TSB) about HandsFreeLink battery drain problems in 2005. They were told the system can get "locked up" in an "on" position and that the "system staying on may cause a dead or low battery while the vehicle’s ignition switch is off." Sounds about right.
Unfortunately the only suggested solution was to replace any units that owners complained about with the same, defective product.
Internal Knowledge of the System's 250mA Draw ∞
A 2008 TSB went a but further into explaining the problem by saying that the HandsFreeLink "control unit has an internal problem, which creates a parasitic current draw of 250mA.” That's a big enough drain to empty the battery overnight and make it impossible to start the vehicle without a jumpstart.
The Parasitic Drain Lawsuit ∞
Before the release of the second TSB, a lawsuit was filed in California by owners tired of needing multiple jump starts, new batteries, and alternator replacements.
The lawsuit says owners are left with no good options. Either disconnect the system that they paid for, or replace it with another defective $1,000 unit and hope nothing bad happens. Spoiler alert … it will.
The case is moving forward after a round of dismissals ∞
Honda was not impressed with the lawsuit's claims. Unfortunately neither was the judge who dismissed any claims about warranty and consumer proctection laws because the plaintiffs waited too long.
The judge did rule that the plaintiffs provided enough evidence to move forward on claims that the automaker concealed possible defects in the Acura cars.