Checking Component And Wiring

Missing function may be due to a blown fuse.

Check that the fuse for the function in question is intact.

Replace the fuse if it is damaged.

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

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.

• Continue 

  Refer to VERIFICATION