Obtaining A Break Position Reading

Obtaining a reading of the ring break diagnosis result 

Obtain a reading of the ring break diagnosis result by clicking on the VCT2000 symbol.

The following results can be obtained from a ring break diagnosis:

If the fault occurs while the ring break diagnosis is running the result will be presented in the form of a break position.

If the fault does not occur while the ring break diagnosis is running the result will be OK. In such case continue by selecting alternative 3 below.

• If the diagnosis detects a break in communication on the MOST network the result will be a break position.
• If there is no fault in the MOST network the result will be OK.
• If the infotainment module (ICM) receives signals on the MOST network but cannot decode them because they are distorted or the light strength is too weak, the result will be POOR.

Determining the break position 

The break position is counted backwards from the infotainment module (ICM) in the MOST network.

Two examples are given in the following:

• The first break position corresponds to 0. This indicates that the break is located in the media player module (MPM) or the cable between it and the infotainment module (ICM)
• If the position is 1, go one step back in the chain and the break will then be located in the phone module (PHM) or the cable between it and the media player module (MPM). The break may also be due to a damaged optical connector in the media player module (MPM), which will then be unable to correctly interpret the incoming signal from the phone module (PHM).
  NOTE:

  The phone module (PHM) is not standard and if not fitted, break position 1 would then correspond to the subwoofer module (SUB).

Select an alternative which includes the control module that is to be checked.

Alternative 1: 

Media player module (MPM)

Phone module (PHM)

Subwoofer module (SUB)

Global positioning system module (GPS)

Integrated audio module (IAM)

Refer to CHECKING CABLE AND COMPONENT 

Alternative 2: 

Audio module (AUD)

Traffic message module (TMC)

AM/FM tuner module (AFM)

Multimedia module (MMM)

Infotainment control module (ICM)

Refer to CHECKING CABLE AND COMPONENT 

Alternative 3: 

The ring break diagnosis result shows that the MOST network is OK.

The ring break diagnosis result is POOR.

Refer to CHECKING CABLE AND COMPONENT 

Other information 

• see COMPONENT LOCATIONS

Fig 2: Identifying VCT2000 Diagnostic Tool Symbol In VIDA

Courtesy of VOLVO CARS CORPORATION

Fig 3: View Of MOST Network

Courtesy of VOLVO CARS CORPORATION

The media player module (MPM) can be replaced by the integrated audio module (IAM).