BAR chief Nick Fry says his team are still backing the voluntary limit on testing in Formula One.
BAR have confirmed they still back the 30-day testing limit
It had been suggested that Honda-powered BAR had changed their mind on the 30-day limit, but Fry insisted that was not the case.
"I think now there is a good level of agreement between all the Formula One teams, perhaps except Ferrari, that 30 days is the agreed amount," he said.
"It was suggested partly by us anyway, so 30 is the number."
But he admitted that he would be much happier if reigning champions Ferrari agreed to limit testing, which is a cost-cutting measure.
"At the moment my understanding is that Ferrari do not agree with that," he added.
"I think it would probably be better for all involved if there were agreements between 10 teams rather than nine.
"So I would hope that between now and the start of the season we can agree - all 10 of us - and not have one team out on its own."
Ferrari's rivals are determined to save money as the 2005 season will have 19 races, which is more than ever.
They initially tried to halve the amount of testing between the start of the season, in March, and the end, in October, to 24 days.
Ferrari do not want to reduce testing as they have their own tracks in Italy and a special relationship with tyre maker Bridgestone.
However, Ferrari boss Jean Todt said recently that they expected to save over £2m by organising tests for 2005 that would require 15 fewer team members.
Reuters news agency quoted Toyota technical director Mike Gascoyne earlier this month saying BAR had pulled out of the agreement to limit testing.
"The fact that all the teams can't agree on something that will cut costs is disappointing," Gascoyne said.
"The nine teams, including BAR, did say that, no matter what, they would stick with that."
But Gascoyne said Toyota, who are arch-rivals of Honda in the Japanese marketplace, still intended to honour the agreement.
"There are no rules - it's a gentleman's agreement and always has been," he said.
"[The agreement has] now broken up. But we still want there to be reduced testing for next [season].
"Toyota are very committed and are planning for reduced testing."
The nine teams had initially hoped to enshrine the testing reduction in the sport's rules.
But Ferrari's refusal of the agreement scuppered that plan as unanimity was needed.
"A lot of people say [a reduction in testing] won't reduce costs," Gascoyne said. "But at the end of the day the only expensive thing about an F1 car is when you run it.
"If you don't run it, I can't see how it's going to be more expensive.
"If other things were beneficial, we would be doing them now.
"F1 does need to control costs and cutting testing, which has no value to the show, is a great way to do it."