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Home >> Volvo >> 2007 >> C30 T5 (CANADA) L5-2.5L Turbo VIN 68 B5254T3 >> Repair and Diagnosis >> Relays and Modules >> Relays and Modules - Powertrain Management >> Relays and Modules - Computers and Control Systems >> Body Control Module >> Description and Operation >> Functions >> Functions [3 of 4]

Functions [3 of 4]

Cargo compartment lighting




The cargo compartment lighting is activated when the trunk lid is opened. When the trunk lid opens the switch in the trunk lid lock unit (3/78) is activated.
The lighting (4 door 10/24, 5 door 10/25) is powered by the central electronic module (CEM) (4/56) via the relay for courtesy lighting (2/89).

Horn




The horn (16/10-11) is operated when the steering wheel module (SWM) (3/254) receives a signal from the switches in the steering wheel. The steering wheel module (SWM) transmits information via a directly connected cable to the central electronic module (CEM)(4/56) indicating that the switch is closed. The central electronic module (CEM) activates the relay (2/17) for power supply to the horn.

Fuel pump




The central electronic module (CEM) (4/56) receives a request from the engine control module (ECM) (4/46) via the control area network (CAN) to start the fuel pump (FP). The central electronic module (CEM) then activates the relay (2/23) which supplies the fuel pump unit (4/83) with power, which in turn powers the fuel pump (FP) (6/33).
If the controller area network (CAN) does not function the relay for the power supply to the fuel pump control module will not be activated.
In the event of a collision in which the airbags are deployed, a signal is transmitted from the supplemental restraint system (SRS) module (4/9) via the control area network (CAN) to the central electronic module (CEM). The central electronic module (CEM) deactivates the relay for the fuel pump unit.

Wiper/washers for the windshield/rear window/ headlights





Note! Rear window wiper and washer are only available on C30 and V50.

The right-hand control stalk (3/134) is moved downwards through three positions to operate the windshield wipers. The steering wheel module (SWM) (3/254) transmits information via the control area network (CAN) to the central electronic module (CEM) (4/56) about the selected position. The central electronic module (CEM) transmits the information on to the wiper motor module (WMM) (6/1) via serial communication.
For intermittent wiping, the process is the same as for low speed, but the time between each stroke is set using the ring on the control stalk to one of eight positions between 1 and 27 seconds. The wiper motor module (WMM) controls this once it has received information about intermittent wiping from the steering wheel module (SWM). The information is transmitted from the steering wheel module (SWM) via the central electronic module (CEM) on the controller area network (CAN).
The Wiper motor module (WMM) has an integrated function to protect the wiper motor from overheating and unnecessary wear.
The load on the motor is monitored and in the event of too great a load or high motor temperature, the wiper speed can be reduced gradually or temporarily switched off to protect the motor.
The wiper speed is reset automatically after the load or temperature has reached a safe level.
The windshield and headlamps are washed when the right-hand control stalk is moved towards the steering wheel. The steering wheel module (SWM) transmits information to the central electronic module (CEM) via the Control area network (CAN) to activate washing. The central electronic module (CEM) activates the relay (2/182) for power supply to the pump motor (6/104) for the headlamps. When washing the windshield the central electronic module (CEM) activates the relay (2/92) for power supply to the pump motor (6/2).
The central electronic module (CEM) receives a signal from the level sensor in the windshield washer reservoir so that it can check the windshield washer reservoir level. The switch in the level sensor closes if the level falls below 0.7 liters. The central electronic module (CEM) sends the signal to Driver information module (DIM) (5/1) via the controller area network (CAN). The driver information module (DIM) displays a text message indicating that the windshield washer fluid needs to be topped up. The symbol for low windshield washer reservoir level lights.
The tailgate wiper (6/32) (C30/V50) is controlled directly by the central electronic module (CEM). The central electronic module (CEM) receives a signal from the steering wheel module (SWM) via the controller area network (CAN). The central electronic module (CEM) then activates relay (2/16) to start the tailgate wiper. The tailgate wiper is powered via relay (2/193).
The tailgate wiper can be programmed so that it is activated if the windshield wipers are on and back-up (reverse) gear is selected.
Rear windshield cleaning is activated when the right-hand control stalk is pushed away from the steering wheel. The steering wheel module (SWM) transmits information to the central electronic module (CEM) via the Control area network (CAN) to activate rear windshield washing. The central electronic module (CEM) activates relay (2/93) to power the pump motor (6/2). The central electronic module (CEM) activates the tailgate wiper at the same time.
The wipers only operate at low speed if there is a fault in the control area network (CAN).
There is no Limp Home function for the rear windshield washer and wiper.

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