Cal. Civ. Proc. Code § 1141.16

(a) The determination of the amount in controversy, under subdivision (a) or (b) of Section 1141.11, shall be made by the court and the case referred to arbitration after all named parties have appeared or defaulted. The determination shall be made at a case management conference or based upon review of the written submissions of the parties, as provided in rules adopted by the Judicial Council. The determination shall be based on the total amount of damages, and the judge may not consider questions of liability or comparative negligence or any other defense. At that time the court shall also make a determination whether any prayer for equitable relief is frivolous or insubstantial. The determination of the amount in controversy and whether any prayer for equitable relief is frivolous or insubstantial may not be appealable. No determination pursuant to this section shall be made if all parties stipulate in writing that the amount in controversy exceeds the amount specified in Section 1141.11.
(b) The determination and any stipulation of the amount in controversy shall be without prejudice to any finding on the value of the case by an arbitrator or in a subsequent trial de novo.
(c) Except as provided in this section, the arbitration hearing may not be held until 210 days after the filing of the complaint, or 240 days after the filing of a complaint if the parties have stipulated to a continuance pursuant to subdivision (d) of Section 68616 of the Government Code. A case shall be submitted to arbitration at an earlier time upon any of the following:
1. (1) The stipulation of the parties to an earlier arbitration hearing.
2. (2) The written request of all plaintiffs, subject to a motion by a defendant for good cause shown to delay the arbitration hearing.
3. (3) An order of the court if the parties have stipulated, or the court has ordered under Section 1141.24, that discovery other than that permitted under Chapter 18 (commencing with Section 2034.010) of Title 4 of Part 4 will be permitted after the arbitration award is rendered.