Checking the power supply and ground for the accessory electronic module (AEM)

Fig 1: Identifying Ignition OFF

Courtesy of VOLVO CARS OF NORTH AMERICA.

• Ignition off.

  Check the fuse in the cargo compartment fusebox for the accessory electronic module (AEM). In particular check the fuse mating surfaces. Check for contact resistance and oxidation.

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

  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.

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

  Other information: 

  • To access the accessory electronic module (AEM), see Replacing the accessory electronic module
  • To connect the breakout box to the accessory electronic module (AEM), see Connecting the breakout box. Accessory electronic module
  • For further information about signals and other values, see Signal description. Accessory electronic module (AEM)
  • See Checking wiring and terminals .
  Fig 2: Identifying Ohmmeter

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

  Courtesy of VOLVO CARS OF NORTH AMERICA.

Was a fault detected? 

• YES 

  Refer to Checking the accessory electronic module (AEM) 

• NO 

  Refer to Checking communication with the accessory electronic module (AEM)