Home >> Volvo >> 2007 >> S60 Base, FWD >> Repair and Diagnosis >> Electrical >> Body Electrical >> Central Electronic Module (CEM), Rear Electronic Module (Rem), Upper Electronics Module (UEM) - Diagnostic Trouble Codes - 1 Of 13 >> AEM-4F60: Back-Up (Reversing) Warning System. Signal Too Low. Permanent Fault (2001-2004) >> Signal too low