Checking The Power Supply And Ground Terminal

Fig 1: Identifying Ignition OFF

Courtesy of VOLVO CARS OF NORTH AMERICA.

• Ignition off.

  Check that the fuse for internal rearview mirror on the central electronic module (CEM) is intact. If the fuse is blown, check the subsequent circuit for a short-circuit to ground. Then replace the fuse.

  Check cable for power supply between inner rearview mirror #A3 and Central electronic module (CEM) #H4 (#18) for open circuit.

  Check cable for ground between inner rearview mirror #A1 and Central electronic module (CEM) #D12 (#12) for open circuit.

  Check the signal line between inner rearview mirror #A2 and Central electronic module (CEM) #H23 (#37) for open circuit as well as short-circuiting to voltage.

  Remedy the cables as necessary.

  Switch on the ignition. Check that the relay for extended X-supply is activated.

  Click the VCT2000 symbol to read the relay status.

  Other information 

  • see CONNECTING THE BREAKOUT BOX (2008-11)
  • see SIGNAL DESCRIPTION CENTRAL ELECTRONIC MODULE (CEM) (2008-11)
  • To access the central electronic module (CEM), see CONTROL MODULE RELAY BOX PASSENGER COMPARTMENT
  • see CONTENTS
  Fig 2: Identifying VCT2000 Diagnostic Tool Symbol In VIDA

  Courtesy of VOLVO CARS OF NORTH AMERICA.
  Fig 3: Identifying Humidity Sensor

  Courtesy of VOLVO CARS OF NORTH AMERICA.

Was a fault detected? 

• YES 

  Refer to VERIFICATION 

• NO 

  Refer to CHECKING COMMUNICATION