XC90 AWD L6-3.2L VIN 98 B6324S (2007)
The following components are used when controlling the cruise control:
engine control module (ECM) (4/46)
steering wheel module (SWM) (3/254)
control unit cruise control (3/4)
central electronic module (CEM) (4/56)
brake control module (BCM) (4/16) (brake pedal position, speed signal)
driver information module (DIM) (5/1) (cruise control light)
transmission control module (TCM) (4/28)
electronic throttle unit (6/120)
brake light switch (3/9).
To activate cruise control, the function must be switched on using the "CRUISE" button. Then a light is activated in the driver information module
The driver activates the function by pressing the SET+ or SET- button. A message is then transmitted via the low speed side of the CAN network to the
central electronic module (CEM) which then transmits the message on via the high speed side of the CAN network to the engine control module (ECM).
The engine control module (ECM) controls the throttle angle so that a constant speed is maintained using the vehicle speed signal from the Brake
Control Module (BCM). The transmission control module (TCM) also receives a message indicating that cruise control is active via the Controller area
network (CAN), so that the transmission follows certain shifting patterns when the cruise control is active.
If the accelerator pedal (AP) is depressed the vehicle speed increases as normal and then resumes the stored value when the driver releases the
accelerator pedal (AP) again.
The engine control module (ECM) continually stores the speed. If the cruise control is disengaged, for example, if the driver depresses the brake pedal,
the previous speed can be resumed by pressing the "RESUME" button.
The cruise control cannot be activated below a certain speed.
Cruise control is switched off:
when the driver depresses the brake pedal
when the driver presses the "CRUISE" button on the steering wheel
when the driver depresses the "0" button on the steering wheel
if "P" or "N" position is transmitted on the controller area network (CAN)
if the speed deviates too much from the set value
when the control system detects a fault that prevents activation. (For further information, see diagnostic trouble code (DTC) information for the
relevant diagnostic trouble codes (DTCs)).