Control Module

Fig 1: Identifying Subwoofer Module (SUB)

Courtesy of VOLVO CARS CORPORATION

The primary task of the subwoofer module (SUB) is to manage sound reproduction from the audio module (AUD) to the subwoofers.

The Subwoofer module (SUB) is integrated with a bass box where the subwoofers are installed.

The subwoofer module (SUB) only functions if the audio module (AUD) is connected to the MOST network.

The Subwoofer module (SUB) checks activations and input and output signals via an integrated diagnostic system. A diagnostic trouble code (DTC) is stored in certain cases if the control module detects a fault. Any diagnostic trouble codes (DTCs) are stored in the control module memory.

The subwoofer module (SUB) uses the MOST network to communicate with other control modules.

In order to function in the MOST network, the Infotainment control module (ICM) checks that the correct serial number is in the Subwoofer module (SUB).

If the number is not correct, the Subwoofer module (SUB) will not function. If the problem persists when replacing the control module, try with the ignition on/off.

A simple way of checking if the Subwoofer module (SUB) functions is to activate the radio and then adjust the volume.

The sound from the Subwoofer module (SUB) should rise and fall as the control is adjusted.

The Subwoofer module (SUB) is located behind the backrest, under the cargo compartment floor.