Checking For Open Circuits And Short Circuits

Check the wire between the upper electronic module and rear reading lamp unit for an open circuit as described in, see OPEN-CIRCUIT, PERMANENT FAULTS , and a short circuit to voltage supply as described in SHORT-CIRCUIT TO SUPPLY VOLTAGE. PERMANENT FAULTS .

UEM-0031 Rear left reading lamp

Control unit #7 and reading lamp unit #1.

UEM-0033 Rear right reading lamp

Control unit #17 and reading lamp unit #7.

Additional information:

For information on signals and additional values, see SIGNAL DESCRIPTION, UPPER ELECTRONIC MODULE (UEM) .
To connect the test box, see CONNECTING THE BREAKOUT BOX .

Fig 1: Identifying Connector Terminals

Courtesy of VOLVO CARS CORPORATION

Fig 2: Identifying Ohms Display

Courtesy of VOLVO CARS CORPORATION