Damper Motor Module (DMM)
The damper motor module (DMM) consists of a control unit and a stepper motor. The different versions of the climate control system have up to 5 damper motor modules (DMM). These are for the different functions such as defroster and recirculation. The climate control module (CCM) communicates with the other damper motor modules (DMM) via two LIN buses, LIN bus 1 and LIN bus 2.
When regulating the different dampers, the climate control module (CCM) transmits a request for a new damper position to the each damper motor module (DMM). The damper motor module (DMM) calculates and then regulates the required direction and number of steps required to obtain the requested position. The damper motor module (DMM) then transmits information to the climate control module (CCM) indicating the actual damper position and status.
When replacing the damper motor module (DMM), the new damper motor must be identified by the climate control module (CCM). This is carried out via VIDA (Volvo scan tool). When replacing the damper motors, ensure that identification is carried out.
Each damper motor module (DMM) is powered via a relay in the central electronic module (CEM).
There are diagnostics for the damper motor module (DMM).