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Home >> Volvo >> 2004 >> S80 Base, 2.5 59, FWD >> Repair and Diagnosis >> Electrical >> Motors, Switches, Relays >> AEM, CEM & Rem Diagnostic Trouble Codes - 9 Of 12 >> CEM-8FA3: Relay, Signal Horn. No Signal. Permanent Fault (1999-2004) >> Signal missing. Permanent fault >> 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 Ohm Meter
GLL101042Courtesy of VOLVO CARS OF NORTH AMERICA.
Fig 2: Identifying Relays And Terminals
GLL104050Courtesy of VOLVO CARS OF NORTH AMERICA.