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 CORPORATION

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 CORPORATION

Fig 2: Connecting Connector

Courtesy of VOLVO CARS CORPORATION

• 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