Electrical Additional Heater (Certain Markets)

WARNING: This page is about a different car, the 2010 Volvo V70, 2009 Volvo V70, and 2008 Volvo V70. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying Electrical Additional Heater

Courtesy of VOLVO CARS CORPORATION

The climate control module (CCM) (4/6) checks the function of the electric auxiliary heater.

The central electronic module (CEM) (4/56) transmits information regularly to the climate control module (CCM), for example, about the permitted size of the current consumption.

The climate control module (CCM) uses this information to prioritize between its loads. The climate control module (CCM) also uses the information to calculate how much output must be used to activate the electrical additional heater (9/41).

The central electronic module (CEM) receives information from the climate control module (CCM) via the CAN network.

The central electronic module (CEM) checks that the output voltage is not too great. See CURRENT LIMITATION - CENTRAL ELECTRONIC MODULE (CEM)

The power consumption of the electric auxiliary heater is regulated via a pulse-width modulated signal from the central electronic module (CEM).