Checking the function of the upper electronic module (UEM)

Check that the upper electronic module (UEM) is powered by switching on one of the rear reading lamps.

Fig 1: Identifying Rear View Mirror

Courtesy of VOLVO CARS OF NORTH AMERICA.

Does one of the rear reading lamps light? 

• YES 

  Refer to Checking communication with the upper electronic module (UEM) 

• NO 

  Refer to Checking the power supply and ground for the upper electronic module (UEM) 

HINT: After carrying out the repair, check that the fault has been remedied. 

Fig 1: Identifying Ignition ON

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Connector(s) Reinstallation

Courtesy of VOLVO CARS OF NORTH AMERICA.

• Ignition off
• Reconnect the connectors. Reinstall the components
• Ignition on.

  Check that the upper electronic module (UEM) is powered by switching on one of the rear reading lamps.

Does one of the rear reading lamps light? 

• YES 

  OKAY:  Troubleshooting has been completed.

• NO 

  Refer to Information