Checking Power Supply And Ground

Fig 1: Identifying Ignition OFF

Courtesy of VOLVO CARS OF NORTH AMERICA.

• Ignition off.

  Check fuse F4 in the fusebox in the engine compartment. Also check the circuit after the fuse. Check for an open-circuit. Check for a short-circuit to ground.

  Check the fuse for the power socket in the cargo compartment on the central electronic module (CEM). Also check the circuit after the fuse. Check for an open-circuit. Check for a short-circuit to ground.

  Check the cable between the accessory electronic module (AEM) and the ground terminal. Check for an open-circuit. Check for a short-circuit to ground. Check for a short-circuit to supply voltage.

  Connect a voltmeter between the power supply cable and ground at the accessory electronic module (AEM). The voltage must be approximately 12V with the ignition switched off.

  Check the ground terminal for the accessory electronic module (AEM). Check for contact resistance and oxidation.

  Other information 

  • see CONNECTING THE BREAKOUT BOX (2004, 2005, 2006, 2007)
  • see CONNECTING THE BREAKOUT BOX
  • see SIGNAL DESCRIPTION CENTRAL ELECTRONIC MODULE (CEM) (2004, 2005, 2006, 2007)
  • see SIGNAL SPECIFICATION
  • see CONTROL MODULE RELAY BOX PASSENGER COMPARTMENT
  • see ACCESSORY CONTROL MODULE (AEM)
  • see CHECKING WIRING AND TERMINALS
  Fig 2: Identifying Voltage Display

  Courtesy of VOLVO CARS OF NORTH AMERICA.
  Fig 3: Identifying Accessory Electronic Module (AEM)

  Courtesy of VOLVO CARS OF NORTH AMERICA.

Was a fault detected? 

• YES 

  Refer to VERIFICATION 

• NO 

  Refer to CHECKING COMMUNICATION