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Home >> Volvo >> 2002 >> S80 Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 55 (Central Electronic Module (CEM), Rear Electronic Module (Rem), Upper Electronics Module (UEM) - Diagnostic Trouble Codes - 1 Of 13) >> CEM-1A05: 30 Power Supply. Signal Too Low. Permanent Fault (2001-2004) >> Signal too low. Permanent fault >> Checks >> Checking the power supply

Checking the power supply

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Check the voltage to ground at the following points: 

The voltage must be at least battery voltage minus three volts.

Check for contact resistance and oxidation at the fuses.

Remedy as necessary.

Other information 

Fig 1: Identifying Voltage Display
GLL101041Courtesy of VOLVO CARS OF NORTH AMERICA.
Fig 2: Locating Fuse Holder (Passenger Compartment)
GLL104037Courtesy of VOLVO CARS OF NORTH AMERICA.

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