1 EXHIBIT 23.1 INDEPENDENT AUDITORS' CONSENT We consent to the incorporation by reference in Registration Statement No. 333-07377 of PIA Merchandising Services, Inc. on Form S-8 of our report dated February 18, 1999, appearing in this Annual Report on Form 10-K/A of PIA Merchandising Services, Inc. for the year ended January 1, 1999. /s/ Deloitte & Touche LLP Costa Mesa, California May 20, 1999