California Code, Civil Code - CIV § 1861.13

Neither the failure of the defendant to oppose the issuance of a writ of possession under this article, nor his failure to rebut any evidence produced by the plaintiff in connection with proceedings under this article, shall constitute a waiver of any defense to the plaintiff's claim in the action, or any other action, or have any effect on the right of the defendant to produce or exclude evidence at the trial of any such action.