MOST Navigation
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Navigation unit for MOST based COMAND is located in left side of trunk. It reads DVD map disks and sends map information over the MOST to COMAND headunit. The same navigation unit is also used in the W211 (E-Class) vehicles. There are several part numbers which all should be compatible. The navigation units have been manufactured from 2003 up to 2007. Theoretically the navigation units are shipped with different firmware versions, however, they all seem to have the same features.
| Part no. | Replaced by |
|---|---|
| A2118200685 | Replaced by A2208205985 |
| A2208205985 | Replaced by A2208206085 |
| A2208206085 | Replaced by A2208703589 |
| A2208703589 | Replaced by A2118708926 |
| A2118708926 | |
| A2118705226 | Replaced by A2118701085 |
| A2118701085 | Replaced by A2118705785 |
| A2118705785 | Replaced by A2118706085 |
| A2118706085 |
After unlocking the car the MOST network wakes up starting all MOST connected devices including the navigation processor. However, it takes some time for navigation processor to start up. If the "NAVI" button on the COMAND is pressed before navigation processor has fully started up, the "Navigation being activated. Please wait." message will appear on COMAND screen. After navigation processor has started up the COMAND Navigation menu is shown.
Using map disk for the first time
When the map DVD is inserted for the first time the navigation processor loads software from that disk. The process usually takes less than a minute. This process happens whenever different version of map DVD is inserted for the first time.
COMAND hidden menu has several menus which show information about navigation processor.
Time synchronization from sattelites
COMAND will not allow to configure time manually if it detects navigation processor being connected.
Navigation processor remembers last GPS position. Therefore, after navigation processor is used in different location (for example, in a different continent) for the first time, it may take even half an hour of driving until navigation unit is able to find satellites and establish its current position.
Common symptom resulting from inability to read map disk is error message "Navigation Wrong version of NAVI DVD in navi unit!" shown on screen some time after navigation processor tries to start up. Navigation firmware does not have separate message for bad read and therefore displays this "wrong version" error message instead.
If the navigation processor is connected to MOST network, but after pressing "NAVI" button on COMAND the message "Navigation unavailable" is shown, it could indicate that board of navigation unit is faulty. Common cause for such fault is water damage.
If COMAND does not work and powers down shortly after starting, it could mean that there is break in MOST ring. This could be caused by completely dead navigation processor. Common cause for such fault is water damage. In this case the unit has to be replaced with working one or MOST ring must be closed using MOST loop connector.
No satellites are detected
If map view (after "MAP" button is pressed) shows that 0 satellites are visible, the GPS receiver of the navigation unit might be faulty. However, it has been observed that sometimes 0 satellites are shown even if navigation works fine or when the navigation unit is connected for the first time and it hasn't yet found its position.
Excessive current draw
Faulty navigation unit with map disk stuck may not power off and could drain significant amounts of current thus draining battery. This can be checked using standard parasitic drain detection methods.
Possible faulty unit symptoms
- Does not recognize current navigation DVD
- No disk load and eject function
- Damaging the disk
- Too loud mechanical noise
- System hangs after 1h, after reset.
- Incorrect navigation
Europe
The latest navigation DVD for Europe is Version 15.0 (2014/2015) - part number A2118274665 released March 2014 (price is around EUR 150).
The following countries are included in the disk: Austria, Andorra, Belgium, Bulgaria, Croatia, Czech Republic, Denmark, Estonia, France, Finland, Germany, Gibraltar, Great Britain, Greece, Hungary, Italy, Ireland, Liechtenstein, Lithuania, Luxembourg, Latvia, Monaco, Norway, Netherlands, Portugal, Poland, Republic of San Marino, Romania, Spain, Slovakia, Slovenia, Switzerland, Sweden, Vatican State City.
Note: Disk cover wrongly states that disk is not compatible with W220.