Checking Component And Wiring

Check the signal cable between the central electronic module (CEM) and the light switch module (LSM). Check for a short-circuit to supply voltage.

Take readings between:

• Central electronic module (CEM) terminal #B21 (#21) and light switch module (LSM) terminal #9.

Remedy as necessary.

Other information 

• see CONNECTING THE BREAKOUT BOX (2004, 2005, 2006, 2007)
• see SIGNAL DESCRIPTION CENTRAL ELECTRONIC MODULE (CEM) (2004, 2005, 2006, 2007)
• see CONTROL MODULE RELAY BOX PASSENGER COMPARTMENT
• see LIGHTING SWITCH
• see CHECKING WIRING AND TERMINALS

Fig 1: Identifying M2D Control Module (FORTV Executive. Rear Seat Entertainment, Generation 3.1/3.2, Premier TV Receiver) Connector

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Ohmmeter

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Identifying Rheostat

Courtesy of VOLVO CARS OF NORTH AMERICA.

• Continue 

  Refer to VERIFICATION