Williams has confirmed that Pastor Maldonado will give the new FW35 its debut in the second pre-season test of the year next week.
The Grove-based team was the only one not to run its new car in the first test of the year at Jerez, instead running the FW34 with a number of development parts ahead of a launch in Barcelona on 19 February.
Williams will now carry out the launch prior to the first day of the second test, with Maldonado at the wheel for the opening day of running on Tuesday.
Team-mate Valtteri Bottas will then be in action on Wednesday before the pair share the car for the third and fourth days of running.
Thursday will see Maldonado on track in the morning with Bottas taking over in the afternoon, with the roles then being reversed for day four of the test on Friday.