Design [2 of 4]
Front fog lamps
If the car is equipped with front fog lights, these are in the bumper casing below the headlights.
The fog lamps are operated via a button in the light switch module (LSM). An LED in the button lights when the fog lamps are activated. The light switch module (LSM) is directly connected to the central electronic module (CEM). The lamps are powered via a directly connected relay on the central electronic module (CEM).
There are diagnostics for the fog lamp relay (front).
Daytime running lights (from structure week 201044, option)
If the vehicle is equipped with daytime running lights, these are located in the bumper casing below the headlights where the front fog lights otherwise would be installed.
Light switch module (LSM) is directly connected to Central electronic module (CEM). The lights are supplied with voltage via a directly connected relay from Central electronic module (CEM), the same relay that normally supplies voltage to the front fog lights.
The relay for daytime running lights/front fog lights can be diagnosed.
Rear fog lamp
The rear fog lamp are in the tail lamps. The fog lamps are operated via a button in the light switch module (LSM). An LED in the button lights when the fog lamps are activated. The rear fog lamp can only be activated when low beam is on (market dependent). The light switch module (LSM) is directly connected to the central electronic module (CEM). The lamps are powered directly via an output on the central electronic module (CEM).
When reactivating key position II, the function is set to de-activated mode.
To detect faults in the rear fog lamps, the central electronic module (CEM) reads the power consumption of the circuit. If the power consumption falls below a certain limit, a fault is indicated and a text message is displayed in the driver information module.
There are diagnostics for the rear fog lamps.
Back-up lamp
There are two back-up (reversing) lamps. These are in the tail lamps. The back-up (reversing) lamp lights when back-up (reverse) gear is selected. The back-up (reversing) lamps are connected to the central electronic module (CEM) via a directly connected relay. The lamps are powered via the relay.
Cars with manual transmissions
Cars with manual transmissions have a back-up (reverse) switch on the transmission. The switch closes and transmits a directly connected signal to the central electronic module (CEM) when back-up (reverse) gear is selected.
Cars with automatic transmissions
In cars with automatic transmissions, a signal is transmitted from the transmission control module (TCM) on the controller area network (CAN) to the central electronic module (CEM) indicating that back-up (reverse) gear is selected.
There are diagnostics for the back-up (reversing) lamp relay.
Brake light
The stop lamps are in the tail lamps. The lamps light when the stop lamp switch on the brake pedal is closed. The stop lamp switch is connected to the central electronic module (CEM). The lamps are powered directly via an output on the central electronic module (CEM).
The stop lamps function even when the ignition is not on. When the ignition is not on, the central electronic module (CEM) is still powered. However the module is in a current saving mode. If the stop lamp switch is activated, the central electronic module (CEM) will also be activated and the stop lamps will come on.
To detect faults in the stop lamps, the central electronic module (CEM) reads the power consumption of the lamp circuit. If the power consumption falls below a certain limit, a fault is indicated and a text message is displayed in the driver information module.
High level stop lamp
There is a high level stop lamp at the top of the rear windshield. This lamp lights during braking together with the standard stop lamps. It is activated when the switch on the brake pedal is closed.
The high level stop lamp is powered directly from the central electronic module (CEM). The lamp consists of a number of LEDs.
There are diagnostics for the high level stop lamp.
Turn signal lamps / Hazard warning signal flashers
There are six lamps around the car to indicate direction changes. These are in the headlamps, tail lamps and in the door mirrors.
The turn signal lamps are operated using the left-hand control stalk.
To cancel the hazard warning signal flashers, where all the turn signal lights flash, press in the button for the hazard warning signal flasher. This is positioned in the middle of the dashboard by the center air vents.
The front and rear lamps are powered directly from the central electronic module (CEM). The lamps in the door mirrors are powered directly from the control module in each door, the driver door module (DDM) or the passenger door module (PDM).
A signal is also sent to the bulb in the hazard warning signal flasher switch when this function is activated.
The central electronic module (CEM) monitors the power consumption on each side to check for bulb faults. If the power consumption falls below a certain threshold value, a fault is indicated and the frequency of the signal to the bulbs is doubled on the side of the blown lamp.
There are diagnostics for the front and rear turn signal lamps.
Wiper/washers for the windshield/rear window/ headlights
Note! Rear window wiper and washer are only available on C30 and V50.
The windshield wipers are powered by a motor positioned under the cowl. There are also washer nozzles on the hood and bumper cover for cleaning the windshield and headlamps. For cars with five doors, there is also a wiper and washer nozzle for the rear windshield. The washer nozzles are connected to two different pump motors on the windshield washer reservoir at the front right of the engine compartment. One pump motor is for high-pressure cleaning of the headlamps. The other pump is for washing the front and rear windshields (5 door).
The windshield wipers are operated using the right-hand control stalk. There are three positions:
- intermittent
- low speed
- high speed.
The time between strokes for intermittent wiping is adjusted using a ring on the control stalk.
Pull the control stalk towards the steering wheel to clean the windshield. The washers for the headlamps are activated simultaneously.
The washers for the headlamps are activated in two short intervals. Then the washer for the windshield must be activated 5 times before a further two short headlamp washes take place. Alternatively the interval is 10 minutes. The headlamp washers are not activated if the level in the windshield washer reservoir is below 0.7 liters.
Push the control stalk away from the steering wheel to clean the rear windshield. There is a button at the end of the control stalk to control the rear wiper.
Information about the position of the control stalk is transmitted to the central electronic module (CEM) on the controller area network (CAN). The central electronic module (CEM) also receives a signal from the wiper motor if the wipers are in the park position.
The central electronic module (CEM) also monitors the windshield washer reservoir level via a level sensor in the reservoir. The switch in the level sensor closes if the level falls below 0.7 liters. A text message indicating that the windshield washer fluid needs to be topped up then lights in the driver information module (DIM).
The wiper motor module (WMM) is powered directly via a 30-supply.
The washer motor for the front and rear windshields is powered via directly connected relays which are on the central electronic module (CEM). The headlamp washers are supplied via a relay in the combined relay and fusebox in the engine compartment.
There are diagnostics for the wiper motor module (WMM) and the relays for the washer pump motors.