Cal. Welf. and Inst. Code § 627.5
In any case where a minor is taken before a probation officer pursuant to the provisions of Section 626 and it is alleged that such minor is a person described in Section 601 or 602, the probation officer shall immediately advise the minor and his parent or guardian that anything the minor says can be used against him and shall advise them of the minor's constitutional rights, including his right to remain silent, his right to have counsel present during any interrogation, and his right to have counsel appointed if he is unable to afford counsel. If the minor or his parent or guardian requests counsel, the probation officer shall notify the judge of the juvenile court of such request and counsel for the minor shall be appointed pursuant to Section 634.
Ca. Welf. and Inst. Code § 627.5