LEMON Manuals: Even more car manuals for everyone
Home >> Volvo >> 2007 >> XC70 >> Repair and Diagnosis (Single Page) >> Electrical >> Body Electrical >> Central Electronic Module (CEM) & Rear Electronic Module (Rem) Diagnostic Trouble Codes (XC) >> CEM-8FA3: Relay, Signal Horn. No Signal. Permanent Fault (2001-2004) >> Signal missing. Permanent fault >> Checks >> Checking the control module for short-circuits

Checking the control module for short-circuits

Measure the resistance between terminal #2 and ground when the relay driver is active. The resistance should be high when the relay driver is active. Replace the control module if the resistance is low.

Other information: 

Fig 1: Identifying Ohmmeter
GLL101042Courtesy of VOLVO CARS OF NORTH AMERICA.
Fig 2: Identifying Relays And Terminals
GLL104050Courtesy of VOLVO CARS OF NORTH AMERICA.