The plea was entered by the R&B singer's lawyer in a Los Angeles court.
He also pleaded not guilty to two other charges.
Brown, 43, was arrested last month on suspicion of driving while under the influence - his second such arrest this year in Los Angeles.
He is also charged with driving on a suspended licence and not having an ignition locking device on his car, as required from a previous case.
His next hearing is on December 13.
Brown pleaded no contest to drunken driving in April, after being arrested in Los Angeles in March, and entered rehab in August under a plea agreement.
He released his first album in 15 years, The Masterpiece, this summer.
Houston died in February of an accidental drowning complicated by the effects of heart disease and cocaine, which was found in her system.
The couple's relationship was notoriously tumultuous, and the two waged public battles with substance abuse before divorcing in 2007 after 15 years of marriage.
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