Checking for open-circuits and short-circuits

Check the cable between the control module and the roof lamp unit. Check for a short-circuit to ground.

Remove the connector from the roof lamp module and measure between the connector and the upper electronic module (UEM) as follows.

UEM-0034 Left front reading lamp

Control module terminal #20 and roof lamp module terminal #3A.

UEM-0036 Right front reading lamp

Control module terminal #20 and roof lamp module terminal #4A.

Check the cable between the control module and the roof lamp unit. Check for an open-circuit.

UEM-0034 Left front reading lamp

Control module terminal #18 and roof lamp module terminal #3A.

UEM-0036 Right front reading lamp

Control module terminal #6 and roof lamp module terminal #4A.

Replace the cable if a fault is found.

If the cable is OK, try a new bulb in the roof lamp module.

Other information:

For further information about signals and other values, see Signal specification
To connect the breakout box, see Connecting the breakout box
To access or replace the lamp:
- For -2002, see Interior lighting and upper electronic module (UEM), replacing
- For 2003-, see Interior lighting, replacing .
See Checking wiring and terminals .

Fig 1: Identifying Connector D Terminals

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Ohm Meter

Courtesy of VOLVO CARS OF NORTH AMERICA.