California Code, Code of Civil Procedure - CCP § 703.030

(a) An exemption for property that is described in this chapter or in any other statute as exempt may be claimed within the time and in the manner prescribed in the applicable enforcement procedure. If the exemption is not so claimed, the exemption is waived and the property is subject to enforcement of a money judgment.

(b) Except as otherwise specifically provided by statute, property that is described in this chapter or in any other statute as exempt without making a claim is not subject to any procedure for enforcement of a money judgment.

(c) Nothing in this section limits the authority of the court pursuant to Section 473 to relieve a person upon such terms as may be just from failure to claim an exemption within the time and in the manner prescribed in the applicable enforcement procedure.