LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Volvo >> 2007 >> S60 Base, AWD >> Repair and Diagnosis (Single Page) >> Electrical >> Body Electrical >> Central Electronic Module (CEM), Rear Electronic Module (Rem), Upper Electronics Module (UEM) - Diagnostic Trouble Codes - 1 Of 13 >> CEM-1A21: Increased Power Supply Relay. Signal Too High. Intermittent Fault (2001-2004) >> Signal too high. Intermittent fault. >> Checking the relay
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Checking the relay

Check that relay 2/29 is installed correctly.

At the same time check relay connection for contact resistance and oxidation as described in Contact resistance and oxidation , and for a loose contact as described in Loose connections (terminals) .

Additional information 

Fig 1: Identifying Ohmmeter
GLL101042Courtesy of VOLVO CARS OF NORTH AMERICA.
Fig 2: Identifying Relays
GLL104048Courtesy of VOLVO CARS OF NORTH AMERICA.

Is there a fault?