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Ring Loop MOST issue

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Old Jan 9th, 2017, 19:15   #11
EdmundIJones
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Hi Chaps,

I've taken the amp out and there were no signs of damp around it or the connectors. I removed the power and MOST table.

there was one red light on the cable block and a red light coming out of the socket in the amp. I removed the power to the amp and that was giving 11-12 volts roughly.

what next?
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Old Jan 9th, 2017, 19:37   #12
SwissXC90
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Quote:
Originally Posted by EdmundIJones View Post
Hi Chaps,

I've taken the amp out and there were no signs of damp around it or the connectors. I removed the power and MOST table.

there was one red light on the cable block and a red light coming out of the socket in the amp. I removed the power to the amp and that was giving 11-12 volts roughly.

what next?
The red lights are good, that shows the LEDs for the optics are working correctly: the amp is receiving an optical signal and sending an optical signal
Good that you confirmed power is present.

You've now done all you can without VIDA

The next step is to get VIDA - either get yourself a copy, or ask a forum member in your region to assist. Ensure you compensate him appropriately (beer, wine, cake, lotto tickets...)

I'll fire up VIDA and copy-paste some info for you....
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Old Jan 9th, 2017, 19:38   #13
EdmundIJones
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I've got VIDA up and running, what information do you need to know?
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Old Jan 9th, 2017, 20:15   #14
SwissXC90
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Quote:
Originally Posted by EdmundIJones View Post
I've got VIDA up and running, what information do you need to know?
OK, so follow the diagnostics to tell you where the ring break is located

PRODUCT SPECIFICATIONS > SPECIFICATIONS, OTHER > 393: Vehicle communication information, infotainment control module (ICM) > Description of parameters

MOST-locked, status
The status indicates whether the MOST network is closed and communication possible.
Ring break diagnostic, status
Note! This parameter is only changed after a ring break diagnostic has been run.

After the ring break diagnosis has been carried out the status indicates if there is an open-circuit and if so the location of the open-circuit.
  • OK
  • Pos1 - Pos8
Hint:
The number of possible positions varies depending on the number of control modules in the vehicle.

Network activity, status
Status indicates if there is communication in the MOST network.

PRODUCT SPECIFICATIONS > DESIGN AND FUNCTION > 393: Vehicle communication information, infotainment control module (ICM) > Function

The function Security on MOST prevents unapproved control modules in the infotainment system from being installed in the vehicle. This is to prevent the theft of units.

The function is controlled by the infotainment control module (ICM). The infotainment control module (ICM) checks the serial numbers of all the control modules in the MOST network and compares these with a stored list. The infotainment control module (ICM) retrieves data about the serial number of the control modules via the MOST network. The infotainment control module (ICM) compares the information with the stored serial numbers.

If a control module is not in the stored list, it is disconnected from the MOST network and the functionality of this control module is blocked. This means that control modules in the MOST network cannot be moved from one vehicle to another.
A diagnostic trouble code (DTC) is stored in the infotainment control module (ICM) if a control module in the stored list gives the incorrect response.
For further information, see Design and Function, MOST.


So... what faults are logged in the ICM?
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Old Jan 9th, 2017, 20:44   #15
EdmundIJones
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Then I tried this the other day it gave me the value of Pos0 which means I did something wrong. It talked about pulling the Arial fuse, does that mean the fuse for the radio?
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Old Jan 9th, 2017, 20:55   #16
SwissXC90
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On a 2004 XC90 the devices are, in order:
ICM
MMM
MP2 CD
PHM
MP1 MD
AUD
SUB
ATM

I think the ICM is Pos1 or Pos0...
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Last edited by SwissXC90; Jan 9th, 2017 at 20:58.
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Old Jan 9th, 2017, 20:57   #17
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Quote:
Originally Posted by EdmundIJones View Post
Then I tried this the other day it gave me the value of Pos0 which means I did something wrong. It talked about pulling the Arial fuse, does that mean the fuse for the radio?
The ATM is the antenna tuning module, which is the AM/FM receiver, located in the rear of the vehicle in the roof under the plastic panel. The ATM is one of the MOST devices.

Design
AM/FM
The antenna module (ATM) consists of a thin film antenna and an AM/FM receiver. The control module can be upgraded with GPS and traffic message channel (TMC) units.

Information from the AM/FM receiver consists of radio signals received on the AM or FM-waveband.
The signal from the AM/FM tuner is transmitted to the audio control module (AUD) and infotainment module (ICM) via the MOST network.

If the antenna module (ATM) is not supplied with voltage communication on the MOST net does not function and the Infotainment system shuts down.
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Old Jan 9th, 2017, 21:42   #18
SwissXC90
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Finally I found the data on the MOST network

Read the section PRODUCT SPECIFICATIONS > DESIGN AND FUNCTION > 3 Electrical system > 37 Cables and fuses > MOST network

For the benefit of those without VIDA:


The infotainment control module (ICM) is the gateway between the MOST and CAN networks for communication to and from control modules connected on the CAN network.

The infotainment control module (ICM) monitors the communication on the MOST network. This involves distributing sound channels on the MOST network, so that sound data can be distributed from, for example, the CD module (MP2) to the audio module (AUD). The majority of activations on the MOST network are initiated by the infotainment control module (ICM). The infotainment control module (ICM) also manages diagnostic trouble codes (DTCs) on the MOST network.

If a control module in the MOST network stops working and is unable to transmit light pulses onwards, or if there is an open-circuit in the fibre optic cable, the entire MOST network will stop working. This means that all the control modules on the MOST network will stop working. For more information about remedying this, see fault management on the MOST network.

The infotainment control module (ICM) must always be connected on the MOST network for communication on the MOST network to work.

The MOST network connections increase and the signal routing may change when control modules are added because adapter wiring is used to connect the new control module.

The control modules on the MOST network should be positioned in a particular order. If this order is not followed, the fault-tracing of the MOST network will deteriorate.

When further control modules are added to the MOST network, these should be placed in the correct order on the network to make it easier to fault-trace the control modules. If the control modules are connected in another order, this does not effect the function of the MOST network, but fault-tracing will be compromised. The control modules should be placed in the following order:

Infotainment Control Module (ICM) (16/1)
Multimedia module (MMM) (16/108)
CD module (MP2) (16/106)
Phone module (PHM) (16/60)
MD module (MP1) (16/107)
Audio module (AUD) (16/105)
Subwoofer module (SUB) (16/79)
Antenna module (ATM) (16/110).

If the MD module (MP1) is installed as an aftermarket accessory in a car with a phone module (PHM) and CD module (MP2), the MD module (MP1) will change positions with the phone module (PHM).

If the configuration of the MOST network in the car is minimal, the following control modules are connected:

Infotainment control module (ICM)
the audio module (AUD)
the antenna module (ATM).

Ring break diagnostics

General
This function is important when fault-tracing the MOST network. Ring break diagnostics are used when there is an open-circuit in the MOST network and diagnostic trouble code (DTC) ICM-DC02 has been stored in the infotainment control module (ICM).

During fault-tracing, all control modules transmit a message to the infotainment control module (ICM) in reverse order in relation to the position on the network. This means that the aerial module (ATM) is first, not last. The control module which is not working will not transmit an answer to the infotainment control module (ICM). This also means that the control modules connected after the defective control module will be unable to transmit a message to the infotainment control module (ICM).

The same applies in the event of an open-circuit in the fibre optic cable in the MOST network. None of the control modules before the open-circuit will be able to send their message to the infotainment control module (ICM). The infotainment control module (ICM) is then able to calculate the position of the open-circuit from the incoming messages.

Hint:
It is important to know which control modules are connected and in what order to identify the control module which sends each message.
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Old Jan 9th, 2017, 22:29   #19
EdmundIJones
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I've just run the diagnostics again and it's still coming back with Pos 0. From what I understand from the information displayed that this counts backwards and poss 0 is a fault with the ATM.

The ATM is the bit behind the plastic in the rear roof section right?
Is there a fuse for the ATM alone ? If so where may this be do you think? I've checked very fuse in the car and can't find any issues.

All hell has been gratefully received.
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Old Jan 9th, 2017, 22:55   #20
SwissXC90
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You like receiving hell?

Fuse for the ATM... hmmm.... I don't have a wiring diagram for the early 2003 / 2004 cars

But the Owner's Manual should tell you, I'm guessing the fuse is in the REM (Rear Electronics Module), the fuse box in the rear left hand side of the cargo area.
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