(a) Any periodic payment (including any scheduled installment under a retail installment contract) that is more than twice the amount of any other periodic payment will be considered a balloon payment for purposes of Section 18206 of the Financial Code.

(b) Any consumer loan or obligation made or acquired which is secured by a motor vehicle and is repayable in other than equal periodic payments shall have no more than one balloon payment during the term of the loan or obligation. The amount of the balloon payment shall not exceed the amount of the projected residual value of the motor vehicle at the time the loan or obligation is made for the corresponding loan or obligation repayment term as prescribed in the most recent issue of any residual value guide approved by rule of the Commissioner. The Kelley Blue Book Residual Value Guide is an approved residual value guide for the purposes of Financial Code Section 18206 and this rule.