XC90 L5-2.5L Turbo VIN 59 B5254T2 (2004)
During the ring break diagnostic, the infotainment control module (ICM) receives responses in reverse order to the order of the control modules. Those
that are located before the MD module (MP1) cannot respond to the infotainment control module (ICM).
The infotainment control module (ICM) receives responses up to position four and presents the value 4.
If there was no open-circuit, the infotainment control module (ICM) would have responded "OK".
Example 2
A MOST network to which the subwoofer module (SUB) is not connected, however the other seven control modules are connected.
There is an open-circuit in the wiring between the phone module (PHM) and the CD module (MP2).
During the ring break diagnostic, the response value from all the control modules before the subwoofer module (SUB) will be one less than example 1
when all control modules are connected.
The infotainment control module (ICM) receives responses up to position three and presents the value 3.
If there was no open-circuit, the infotainment control module (ICM) would have responded "OK".