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Home >> Volvo >> 2007 >> C30 T5 (CANADA) L5-2.5L Turbo VIN 68 B5254T3 >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Relays and Modules - Computers and Control Systems >> Body Control Module >> Description and Operation >> Design >> Design [1 of 4]

Design [1 of 4]






Design

Alarm
See Design and Function, Alarm.

Locks
See Design and Function, Central locking.

Immobilizer
See Design and Function, Immobilizer/start inhibition.

Alcolock (option 2009-)
See Design and Function, Alcohol Analysing Start Inhibitor.

Automatic start/stop of engine (2010-)
See Design and Function, Automatic start/stop of engine (2010-, only on vehicles with the function automatic start/stop of engine)

Current limiting
The central electronic module (CEM) checks and sometimes limits the current from the battery and generator. The central electronic module (CEM) can prioritize between different loads in the prevailing conditions.
If there is a fault with current limitation, the general warning lamp will light in the driver information module (DIM) and a text message will be displayed.

Generator (GEN) (Alternator control module (ACM))




See Design and Function, Generator (GEN) and Design and Function, Engine control module (ECM).
See also Design and Function, Regenerating brake energy (2010-).

Secondary battery (2010-, only on vehicles with the function automatic start/stop of engine).




The secondary battery is used in the function automatic start/stop of engine, see Design and Function, Automatic start/stop of engine.
The secondary battery is only connected to the vehicle's electrical system when the engine is restarted after autostop and when the secondary battery needs to be charged. Connecting the secondary battery to the vehicle's electrical system is controlled by Engine control module (ECM) via a relay.
Central electronic module (CEM) is monitors the secondary battery's voltage and controls the secondary battery's charging.
When the secondary battery needs charging the Central electronic module (CEM) sends a request to Engine control module (ECM) to connect the secondary battery to the vehicle's electrical system. When the alternator is charging and secondary battery is connected, the battery is charged.

Note! When restarting the engine, it is only Engine control module (ECM) that controls connection of the secondary battery.

When the engine is on (alternator charging) and the secondary battery is connected to the vehicle's electrical system, the secondary battery's voltage will be the same as the rest of the electrical system's voltage. If the secondary battery is disconnected, the voltage will be lower.
See also Design and Function, Automatic start/stop of engine.
The secondary battery's voltage can be diagnosed.

The battery monitor sensor (BMS) (only vehicles with the function for brake energy regeneration 201020-)





Note! From structure week 201020- the battery monitoring sensor (BMS) is LIN-connected to Central electronic module (CEM) instead of to Engine control module (ECM) as before. (For D4164T the battery monitoring sensor is still connected to Engine control module (ECM).)

The battery monitoring module is fitted on the battery's negative terminal and its main function is to monitor battery status.
For more information about battery monitoring sensor (BMS) function, see: Design and Function, Brake energy regeneration.

Headlamps





Warning! The ballast, which is located in the wheel arch liner, and the wiring for the Bi-Xenon lamps are high voltage.For S40/V50 (200720-), C30/C70 (200946-), the ballast is integrated in the headlight.

The headlamps are operated via the light switch module (LSM). This is on the dashboard at the side of the steering wheel. The light switch module (LSM) is directly connected to the central electronic module (CEM). Low and high beam are operated by moving the left-hand control stalk towards the steering wheel.
Low beam is powered directly by the central electronic module (CEM). High beam is powered via a directly connected relay on the central electronic module (CEM). The level of the supply voltage to the low beam is regulated by the central electronic module (CEM). When the supply voltage is sufficient (in excess of 13 V), pulse width modulation is used to maintain the voltage level at 13.0 V +/- 0.2 V. This does not apply to cars with Bi-Xenon lamps.
Cars with Bi-Xenon lamps are powered directly via the central electronic module (CEM) without pulse width modulation.

Warning! The ballast, which is located in the wheel arch liner, and the wiring for the Bi-Xenon lamps are high voltage.For S40/V50 (200720-), C30/C70 (200946-), the ballast is integrated in the headlight.

In Bi-Xenon lamps, the reflector in the lamp housing is moved by an actuator motor when changing between high and low beam. The actuator motor is integrated in the lamp housing.
To detect problems with the low beam, the central electronic module (CEM) reads the power consumption of the circuit. If this falls below a certain threshold value a fault will be indicated. The general warning lamp lights in the driver information module (DIM) and a text message is displayed.
There are diagnostics for the high beam relay.
There are also diagnostics for the high and low beam function (actuator motor) for Bi-Xenon lamps.

For more information on Bi-Xenon lights:
S40/V50:
See: Design and Function, GDL-lights (-200719).
See: Design and Function, Headlamp Control Module (HCM) (200720-).
C30/C70:
See: Design and Function, GDL-lights (-200945).
See: Design and Function, Headlamp Control Module (HCM) (200946-).

Right and left-hand asymmetric lamps
The right and left-hand asymmetric lamps are adjusted mechanically using a simple operation. A lever is accessible when the rear cover on the headlamp housing is opened.

Halogen




A = left-hand asymmetric
B = right-hand asymmetric

Bi-Xenon




A = left-hand asymmetric
B = right-hand asymmetric

Headlamp range adjustment (certain markets)




There are two motors which angle the headlamps upwards or downwards to control the range of the beam. The motors are integrated in the headlamps.
The motors are controlled by a thumb wheel which is located in the light switch module (LSM) on the dashboard by the side of the steering wheel.
If the thumb wheel is turned, information is transmitted to the motors which adjust the headlamps accordingly.

Automatic range adjustment (Bi-Xenon)
S40/V50:
See: Design and Function - GDL-lights (-200719).
See: Design and Function, Headlamp Control Module (HCM) (200720-).
C30/C70:
See Design and Function, GDL-lights (-200945).
See: Design and Function, Headlamp Control Module (HCM) (200946-).

Headlamp range adjustment position sensors (Bi-Xenon)
S40/V50:
See: Design and Function - GDL-lights (-200719).
See: Design and Function, Headlamp Control Module (HCM) (200720-).
C30/C70:
See: Design and Function, GDL-lights (-200945).
See: Design and Function, Headlamp Control Module (HCM) (200946-).

Parking lights / number plate lighting




There are a number of lamps positioned around the car to mark its position. These are in the headlamps, tail lamps and on the front fenders (US model). The lamps light together with the number plate lighting when the light switch module (LSM) is in parking lamp mode or low beam is on.
The lamps are powered directly via two outputs on the central electronic module (CEM). One of the outputs powers:
- the front left-hand parking lamp
- the left-hand parking lamps
- the license plate lighting
- the rear right-hand parking lamp.
The other output powers:
- the front right-hand parking lamp
- the right-hand side parking lamps
- the rear left-hand parking lamp.
There are diagnostics for the light switch module (LSM) and the lamps.




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