XC70 AWD L6-3.2L VIN 98 B6324S (2009)
Headlamp Control Module: Description and Operation
Function
Function
Automatic headlamp levelling
For vehicles without Four-C (Continuously Controlled Chassis Concept), the position sensors (7/119, 7/121) for rear wheel suspension and front wheel
suspension send information to the headlamp control module (HCM) (4/118) on vehicle angle as regards to load constrictions, acceleration and braking.
For vehicles with Four-C (Continuously Controlled Chassis Concept), the suspension module (SUM) (4/84) sends information to the headlamp control
module (HCM) on vehicle angle as regards load constrictions, acceleration and braking.
The headlamp control module (HCM) uses the information from the position sensors or suspension module (SUM) to calculate the actual angle for the
headlamps.
For vehicles with active headlamps, the headlamp control module (HCM) transmits information on the actual angle to the left headlamp control unit
(LHCU) and right headlamp control unit (RHCU) via serial communication. The adjustment motors are then controlled by the left headlamp control unit
(LHCU) or right headlamp control unit (RHCU), respectively, via an analog signal.
For vehicles without active headlamps, the headlamp control module (HCM) regulates the relevant adjustment motor via a signal.
Active headlamps (vehicles with active headlamps only)
