Checking The Power Supply

Fig 1: Identifying Ignition OFF

Courtesy of VOLVO CARS CORPORATION

• Ignition off.

  HINT: The diagnostic trouble code (DTC) can be stored if the power supply in the central electronic module (CEM) has been below 8 V for a certain time. 

  Check the battery voltage. The battery voltage must be approximately 12 V.

  Check all power supply connections to the central electronic module (CEM) from the engine compartment fusebox.

  Check the wiring. Check for intermittent open-circuits and short-circuits to ground.

  Remedy as necessary.

  Other information 

  • see CONNECTING THE BREAKOUT BOX, CENTRAL ELECTRONIC MODULE (CEM)
  • To access the central electronic module (CEM), see:CONTROL MODULE RELAY BOX PASSENGER COMPARTMENT
  • see CHECKING WIRING AND TERMINALS

Was a fault detected? 

• YES 

  Refer to VERIFICATION 

• NO 

  Refer to REPLACING THE CONTROL MODULE