Central Electronic Module (CEM) (2000-2004): Lighting: Headlamps

WARNING: This page is about a different car, the 2004 Volvo S40, 2003 Volvo S40, 2002 Volvo S40, 2001 Volvo S40, and 2000 Volvo S40. However, it is still accessible from the selected car via links, so may be relevant.

Since twin headlights are used, the low beams are also on when the high beams are on. DRL (running lights) or NDRL (normal headlights) can be programmed by the customer and with diagnostics tool.

DRL= Daytime Running Light, NDRL= Non Daytime Running Light

By the customer: The light switch must be in position for parking lights. The ignition must be on (pos. II). Hold and turn the light switch towards yourself and turn the headlight switch to pos. 0. The green light-emitting diode below the switch is lit to confirm that DRL is on. To return to NDRL, do the same thing and the green light-emitting diode goes off as confirmation.
Witt the diagnostics tool; follow the instructions in the program menu.

If DRL is programmed:

Continuous high beams in key position 2.
High beams only in key position 2.
Flash the light with a light pull.
Continuous light with a heavy pull.

Some functions must be programmed in Central electronic module (CEM) after the module has been replaced:

Since twin headlights are installed, high beams and low beams can be on at the same time
Running lights
Rear wiper for V40
Follow-Me-Home lighting

Switches have a smoother design thanks to lower current flow through these switches.

If a switch is activated for a longer time than 180 seconds (e. g., if it jams), the function is shut off for safety reasons.

When the starter motor is engaged (key in pos. 3), all functions are cancelled without the functions' status changing.

If voltage is too low and high beams are selected, only low beams are available.

Should a major malfunction occur on Central electronic module (CEM), the low beams are turned on.