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Gateway 500 for MOST - not ready for prime time?

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Gateway 500 for MOST iPod Integration - Good unit, poor documentation

NOTE: I changed the subject line of this post ; it was originally "Not ready for prime time?" because of the poor instructions in the installation manual, and a less than satisfactory user manual detracting from otherwise good hardware. With Firmware update 2.XX and a new user manual, significant improvements have been made; the installation manual (dated "after 03/13/07") still needs revision, so I hope the post below will help until the revision is in place.

NOTE: Fairly recently I was made a moderator of this sub-forum. That permits edit capabilities I did not have before. This thread is very long, and can be difficult to use. As a result, I am attaching a pdf file (see "Attached Files" at the bottom of this post), which you can download. The pdf is much more recently edited, and hopefully, is easier to follow and understand.

Also: When reading this, and the pdf file, please note that Dension has upgraded its equipment. This post was written for version 1 and 2 hardware; Section 7 of the pdf deals with version 3 hardware, and note that the DIP switch settings may have to be different than those for versions 1 and 2. Also, there are differences in installation for cars with Sirius and those without. Last, Dension has indicated compatibility problems for North American COMAND units that have a red and a green "Send" and "End" button for cell calls. Before ordering, BE SURE to check compatibility with Dension!!

Please also not that I am not an installer; I have Version 2 equipment in my car, and that is the latest with which I have hands-on experience. I apologize that this thread (and even the far shorter pdf file) are lengthy and involved, but they demand attention before buying and installing. I will not be able to provide troubleshooting for problems that are beyond my hands-on experience.

I installed a Dension Gateway 500 (GW 500) for MOST bus in my 2005 S500 (U.S. spec). Below, I document the installation from removing the COMAND unit, including the wood fascia; locating and running the three copper cables from the console to the GW 500 location; locating the GW 500 device; and connecting it to the fiber optic ring. This was a difficult first-time project. I accept no liability for damage to your car or to your GW 500 if you attempt it. In addition, I do not repeat the steps of the Dension supplied Instruction or User Guides, but supplement them. You will have to use the installation guide and user guide. In addition, I am familiar with my own '05 W220 because I have done this installation; I am not familiar with other models in detail, and cannot answer specific questions about them. I hope there is sufficient detail below to carry over to other models.

Most of you will already know that the GW 500 is designed to allow an iPod to replace the CD Changer (CDC) on the fiber optic bus, but allow switching back to the CDC if desired. On COMAND-equipped cars, it will display menus as well as song title, playlist name, and play time on the COMAND display; and track information on the instrument cluster multifunction display.

I located the iPod, USB, and AUX connections and the CDC/GW500 mode selector switch in the console, and the GW 500 unit behind the ashtray in the COMAND console space. The cables (copper and fiber optic) supplied require an installation in the passenger compartment; they are long enough if you locate the input cables in the glove compartment, but are barely long enough for a console installation in an S-Class. They truly need to be at least 6 inches longer.

REMOVE THE COMAND UNIT

The COMAND unit is removed by placing the car in "Drive"� (set the parking brake); pulling the ashtray out; removing two screws behind the wood fascia with a #20 Star driver; then fully removing the ashtray (disconnecting the cigarette lighter connector at the back). See first photo.

With the ash tray and screws removed, the air conditioning controls slide right out; I reached under it and gently pulled it from behind. Only two clips hold it after removing the screws. See second photo.

After removing the ashtray and A/C controls, you may place the shift lever in Park. The wood fascia for the ashtray and A/C controls come out with the units, and do not have to be separately removed. All of the wood fascia are sturdy; they are mounted to a metal or heavy plastic backing, and the only special care needed is not to scratch them. I did not disconnect the A/C unit from its harness, but let it hang to the right of the console.

Next, insert a small screwdriver or knife (covered with tape if you wish) at a lower corner of the upper wood fascia, above the COMAND unit, and pry it outward. The fascia is held in only by sturdy plastic clips and will pull out easily. In the photo below, the clips for the A/C controls and the removed upper fascia (resting atop the A/C control unit) are visible. See third photo.

Removing the A/C controls and upper fascia reveal the four Star screws (#20 driver) at the corners of the COMAND unit that hold it in. At this point I went on to installing the iPod, USB, and AUX input/GW 500 selector switch in the console, and routing the wires to the now-open space below the COMAND unit.

However, for purposes of illustration, the last photo shows the back of the removed COMAND 2.0. The MOST version has only five connections: Two fiber optic leads (orange), a +12 volt wire (red/yellow), a brown wire (ground), and a blue/black wire (I believe the dimmer control for lighting the buttons on the front of the unit). That’s all there is for the MOST unit. We’ll get back to the connections made here, later.

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Interesting installation location. I can see why you needed the extra foot of cable - but to tell the truth, Dension should lengthen that cable anyway. The length made for difficulty installing it even where I put it.

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I bought my gateway 500, i took my car to a install shop and it has been there for a day and a half they called and said they could not get it working the unit powers up but on the comand it says there is no cd changer my cdc is in my trunk but he tried to hook the unit up to the head unit we followed the instructions plus skylaws write ups, i also have sirius in my car i dont know if that poses a problem the dension people said it has to be hooked up to the cd changer in the trunk to work, so i said by pass the whole cdc so i wouldnt have a 6 disc but i really did not care because i would have my ipod that did not work the dension people went on to try to sell me their extension cables for the system so i can run it from the trunk. any ideas to what would be wrong, i am going to pick up my car from the shop real soon and await the extension cable but does any one know of a quick fix that could get it working

-J.D.
If you have a Hardware version 3 unit (the GW 500 currently shipping), did you install it and configure the DIP switches in accordance with posts 33 and 35, and reset the fiber optics in accordance with post 32?

If it is installed just ahead of the CDC "in the fiber optic loop" (that does not mean physically beside it) you should not lose anything. Running extra cables should not be necessary, either.

It is possible that the satellite radio position on the bus is causing a problem getting the CDC and GW 500 properly positioned in the loop. Unfortunately, I do not have a diagram showing the SDARS in the loop in the standard setup. With such a diagram, it could probably be worked around.
after 2 days in the shop, they said they got it working! no extra cables were necessary my installer, Billy at divine sounds in tampa got it up and running he told me it was a pain in the butt to do and the install was nothing like the manuel. he charged a $150 for the install and anyone in tampa or a surrounding area interested i can supply his contact information this definitely doesn't seem like a simple job he also said the loop picture from a couple pages back was off because of the sirius i had installed in my car....golfnut and skylaw how long did it take to install your units?
Well, I am happy it got done - and it sounds like several things in this string are confirmed as "truisms"

1) The installation is not like that shown in the manual, especially with GW 500 Version 3 hardware. It is as described in posts 32, 33, and 35 above.

2) The simplest installation in the S-Class (and for any trunk mounted CDC, I suspect) without satellite radio still requires changes in the trunk as described early in the string (post #11 and diagrams in post #5). With this installation and the steps in posts #33 and 35, no extra wiring harnesses are required - and now we know that is true even if you have a Sirius installation. This installation will require resetting the fiber optics bus to change from the iPod to the CDC and back (it's just a matter of shutting down the car, powering the HU off, waiting about a minute, then restarting everything), just as we did with Version 1 and 2 GW 500 hardware. However if you have a Version 3 GW 500 and want to be able to switch from the iPod to the CDC and back without resetting the fiber optics bus you must add a fiber optics harness (which can be a major and expensive proposition if you have a trunk mounted CDC). The procedure set out in this string - with trunk changes and the information in posts 33 and 35 - avoids the need to do that.

3) Your satellite radio installation did in fact complicate matters. I have located a fiber optic diagram for Sirius. A preliminary look would indicate that by swapping the fiber optic leads (only; not copper wire connectors) between the CDC and the satellite radio, and installing the GW 500 on the output side of the COMAND (or HU) fiber optics, would do the trick. However, knowing where the SDAR (Sirius) is in the ring will be important in making sure the GW 500 is installed immediately ahead of the CDC in the ring. With that, one could figure out easily enough which changes had to be made with the fiber optics connections in the trunk. I will try to post fiber optic loop diagrams for satellite radio equipped cars, with suggested changes, a bit later. (NOTE: The diagrams for trunk-mounted CDCs with Sirius have been added to post #5 above).

The physical labor doing the installation of my Version 2 GW 500 was about 6 hours spread over 3 days. It took about 4 hours for the passenger compartment installation. However, I had never removed a COMAND unit; did not know exactly where the GW 500 electronics would fit; had never taken apart my center console compartments; and I was pausing to take photos to document the installation. I believe that it would take me about 2 hours or less, now. It would be the same for the Version 3 GW 500.

It took two days to work through the changes necessary in the trunk for my installation, with the able assistance of Rob13572468, of Mid-City Engineering in Chicago. The folks who sold me the unit tried to help too, but in the end I wound up sending them what we had learned. Similarly, it took about 2 days to work out the additional changes necessary for the version 3 box that Golfnut installed. Most of the delay is not in figuring out the problem; it is simply ordinary delay in e-mail correspondence.

Once I started making the changes in the trunk, it took about an hour, even with documenting the installation. While I had not been into the electronics bay of my '05, I had often been in the bay of my '00, and it wasn't hard to apply the experience from that. A first-timer could expect to take twice that long, or more. It then took about an hour to set up the unit for display of song titles, and to learn the ins and outs of the menus (and document that as well). I also went through the firmware upgrade procedure (though it was unnecessary; I just wanted to see what it would do).

For a professional installer with experience with the same type of GW 500 unit being installed, and with Mercedes experience, I would expect the job to take about 3 hours. However, as you can see, working past the wrinkles can take much longer. Dension has resisted creating specific and detailed installation instructions for each kind of car, and it really complicates matters; the instructions are still sketchy, and they have not really considered or addressed the problems created in a trunk-mounted CDC installation. Their answers to me when I have suggested changes were "we write the instructions for a professional installer." Hardly, as we have seen.

Ergo, this string. Thanks for the update. It may help the forum if you can let us know what fiber optic changes Billy made, given your Sirius installation. It might confirm my preliminary look, above.

Given the problems encountered, $150 was a very good price for your installation. Billy took a beating on that, but I hope this generates enough business that he recovers the investment.
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After playing with the gateway 500 for a day, i am impressed but many of the other things posted are very true, the unit works as described and sounds great. Some things i dont like are that the second you change a track or playlist it starts i also dont like that everything says track 1 2 3 ect until a breif second later it shows the playlist, artist, ect i also dont like that once you select a playlist you have to wait 30 seconds for it to bring up the track listings. besides that i love the unit and it is great i even attached some pics below!

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You are correct that once a song or playlist comes up, it starts right away.

My unit does not show "Track" before it shows a song title, and song titles come up very quickly. You might try resetting the "+page" option again, and be sure it takes, as discussed in post #12 above. If you don't do that, you will sometimes find that you won't get song titles after the song changes - it may revert to displaying only track number.

My playlists load quickly; the only delay is when the lists change from one page to another, and that takes perhaps 5 seconds. Once I select a playlist (or any song in an album or artist sort), the first one in the list comes up very quickly.

If you are using your entire music library as a playlist (that's what you're doing when you have your iPod's name selected, as shown in one of your photos), the iPod itself has to sort through the entire library to get the list. That can cause a slight delay, but it's caused by the iPod and not the Gateway 500.

I believe this may be more related to the initial setup, with the "+page" feature.

Also - did your installer wind up switching the fiber optics connections between the satellite radio and the CDC (instead of the VCM and the CDC), as I suggested after your posts? Reviewing the F/O block diagrams, that seems to be the logical change for a Sirius-equipped car with a trunk-mounted CDC, but confirmation would be nice.
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after 2 days in the shop, they said they got it working! no extra cables were necessary my installer, Billy at divine sounds in tampa got it up and running he told me it was a pain in the butt to do and the install was nothing like the manuel. he charged a $150 for the install and anyone in tampa or a surrounding area interested i can supply his contact information this definitely doesn't seem like a simple job he also said the loop picture from a couple pages back was off because of the sirius i had installed in my car....golfnut and skylaw how long did it take to install your units?
My install took a good 6 hours from beginning to end, but that's largely due to the fact that my installer kept focusing on the Dension instruction manual rather than the official "Skylaw" instruction manual. I also ended up paying $150 to get it installed.

Another thing I did that took a significant amount of time was I had the installer extend the iPod connection cable so I could mount it where the phone is supposed to go in my S55. That took at least 1 1/2 hours because of all 12 wires beneath the sheathing!

Now that I know what needs to be done, I think it could be done in about 2 hours. The connections in the trunk are fairly easy - the hard part is getting all the equipment out and then getting it all back together. I don't even want to think about what it would cost if I get rear-ended in the left side...

I don't notice any delays as you mentioned - as Skylaw suggested I'd reset the "+Paging" option.

A month later and I'm still very pleased with the GW500. Despite the nightmare it was getting it hooked up and running, it was well worth the aggravation.
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i reset the paging and everything works great, as you mentioned despite the original fustration i could not be happier with the unit!
This is an interesting thread. One thing I haven't read if it has been solved yet is the instrument cluster display. If it still showing just "Track 1"...etc., or is it showing song name now?

The one nice thing about the Mercedes iPod interface is it displays on the instrument cluster. Actually, the only nice thing is it displays on the instrument cluster, since nothing shows up on Comand. This is likely due to the fact it's based on CAN buss instead of connecting the MOST ring, so it really doesn't have any connection to the Comand at all short of the audio input. Everything is programmed with the steering wheel controls, though I must admit that works well. The only thing that sucks about it is you can't skip to the next song if you don't have "iPod" displayed on the cluster.
I suspect the fact the cluster is using CAN Buss might also be the reason the GW500 displays on Command but not the cluster since it's MOST based, and is therefore limited to what Comand sends to the cluster.

Having a display on the Comand would be nice, but not sure it's worth losing the cluster display for.

Comments?

Thanks!

Dang
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This is an interesting thread. One thing I haven't read if it has been solved yet is the instrument cluster display. If it still showing just "Track 1"...etc., or is it showing song name now?

The one nice thing about the Mercedes iPod interface is it displays on the instrument cluster. Actually, the only nice thing is it displays on the instrument cluster, since nothing shows up on Comand. This is likely due to the fact it's based on CAN buss instead of connecting the MOST ring, so it really doesn't have any connection to the Comand at all short of the audio input. Everything is programmed with the steering wheel controls, though I must admit that works well. The only thing that sucks about it is you can't skip to the next song if you don't have "iPod" displayed on the cluster.
I suspect the fact the cluster is using CAN Buss might also be the reason the GW500 displays on Command but not the cluster since it's MOST based, and is therefore limited to what Comand sends to the cluster.

Having a display on the Comand would be nice, but not sure it's worth losing the cluster display for.

Comments?

Thanks!

Dang
Personally, I'd rather have the COMAND display than the MFD display - but I can absolutely agree it's a personal choice. I just wish denison would get off their arses and release the CANBUS module so that I can use both!

I also like the fact that you don't need to pre-amplify the iPod signal to make up for MB's crippling of the AUX input - again a factor of dumping data straight onto the MOST network.

All in all, I made the decision to go with a GW500 for my SLK rather than the MB kit. I have a DICE kit in my C - D2B so I had no option to get MB, and since it's not a CD_TEXT compatible headunit I was not going to get real value from the GW500.
I agree with you on the advantages of the GW 500 over the MB kit, UK. Contributor floobydust has used his audio test equipment to show that the GW 500 provides better sound quality that the MB kit, because of the way MB limits the audio input. OEM iPod Adapter vs. In-Dash CD vs. Gateway 500 - MBWorld.org Forums
This is an interesting thread. One thing I haven't read if it has been solved yet is the instrument cluster display. If it still showing just "Track 1"...etc., or is it showing song name now?

The one nice thing about the Mercedes iPod interface is it displays on the instrument cluster. Actually, the only nice thing is it displays on the instrument cluster, since nothing shows up on Comand. This is likely due to the fact it's based on CAN buss instead of connecting the MOST ring, so it really doesn't have any connection to the Comand at all short of the audio input. Everything is programmed with the steering wheel controls, though I must admit that works well. The only thing that sucks about it is you can't skip to the next song if you don't have "iPod" displayed on the cluster.
I suspect the fact the cluster is using CAN Buss might also be the reason the GW500 displays on Command but not the cluster since it's MOST based, and is therefore limited to what Comand sends to the cluster.

Having a display on the Comand would be nice, but not sure it's worth losing the cluster display for.

Comments?

Thanks!

Dang

The newest hardware revision (the V3) dension actually has a CAN transciever onboard which they added specifically to address the instrument cluster display issue. The only problem is that its the wrong transciever type. Most mercedes models use a special type of CAN transciever called fault-tolerant. In addition the manner in which the text information is displayed on the cluster uses an indexed system which requires an interface to sit in between the radio and the cluster to properly display the text. I have a feeling that this is the reason why we havent seen a display interface released; its a pretty complex job that might not be financially viable for therm to produce.
The newest hardware revision (the V3) dension actually has a CAN transciever onboard which they added specifically to address the instrument cluster display issue. The only problem is that its the wrong transciever type. Most mercedes models use a special type of CAN transciever called fault-tolerant. In addition the manner in which the text information is displayed on the cluster uses an indexed system which requires an interface to sit in between the radio and the cluster to properly display the text. I have a feeling that this is the reason why we havent seen a display interface released; its a pretty complex job that might not be financially viable for therm to produce.
Sounds like a midnight Rob project! :D I'll provide the pizza and beer!
Does the fact that the Mercedes compatibility list at Denison abruptly ends a couple years ago mean that newer models use a different MOST system and are truly incompatible or simply that their website does not get updated. Is there a significant change in Mercedes MOST between 2007 and 2008. I don't have COMAND, just the Audio 20 with CDC. The Mercedes supplied IPOD kit is incompatible with my particular model so I was thinking the GW500 would be a good solution. I know, I should really contact the mfgr. and I will but it being a weekend and all I thought I would throw this out there. I have read most of the posts that a "Gateway 500" search pulls up.
Does the fact that the Mercedes compatibility list at Denison abruptly ends a couple years ago mean that newer models use a different MOST system and are truly incompatible or simply that their website does not get updated. Is there a significant change in Mercedes MOST between 2007 and 2008. I don't have COMAND, just the Audio 20 with CDC. The Mercedes supplied IPOD kit is incompatible with my particular model so I was thinking the GW500 would be a good solution. I know, I should really contact the mfgr. and I will but it being a weekend and all I thought I would throw this out there. I have read most of the posts that a "Gateway 500" search pulls up.

jlib - as I understand it (and Rob would be a better source..) the '08's changed the MOST command structure, so the GW500's don't work out of the box.

That said, was the MMI interface an option on your car? If it was, then I think you are in the "GW500 won't work" box. If not, you should be good to go. If you want to PM me your VIN, I'll see what I can dig up.

Bottom line is to give the Denison folks a call, see what they say.
Hi Skylaw,
Just bought a GW500 from NSV Auto in Dubai. Great price $425/=.
About to install it to my Audio20, no CDC attached, no tel, no GPS/Nav. Does this mean that the fibre optic wires run directly from the headunit to the GW500? ie only 2 components in the loop?since there are only 2 components is direction of travel of light a factor?
Also have the bluetooth tel adaptor but im assuming that plugs directly into the GW500 unit.
Thanks for your help
praveen,

You can download the (still difficult to understand) instruction manual on the Dension site. I have no idea whether you have fiber optics leads in your car for the components that are not installed - if you do, you're in luck. You will use only the "car" connection on the GW 500, and not the "CDC" connection.

However, yes - the fiber optic leads will run directly between the Audio 20 and the GW 500; and yes, the direction of light will still matter. However, the fiber optics connectors now make it difficult to make a mistake there. With your equipment it would seem that you will use the Installation 3b, and also use DIP switches #1-5 down and #6 up.

If you ordered the GW 500 and its separate Bluetooth module, it will connect to the GW 500 per the installation manual for the module. If you ordered the BTA 1500, I believe that is a combination iPod/Bluetooth unit.
Is the MOST loop self configuring for newly attached devices? Since Praveen has no CDC does he have to have car programmed to find "CDC" or is it automatic when adding GW500?
Is the MOST loop self configuring for newly attached devices? Since Praveen has no CDC does he have to have car programmed to find "CDC" or is it automatic when adding GW500?

MOST with the external audio gateways are pretty good at "seeing" new components - the A20 is not so smart, so you very well may need DAS to tell it that it's now got a CDC. In any event, won't hurt to install and see if it works - if not get the dealer set your changer to present.
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