Roof antenna

[mr. shr]

Hi All,
My W202 has a roof aerial located to the rear just above the rear screen.

Putting my VIN into the Russian MB site suggests the car has telephone pre-wiring.
I have two questions:

1) Can this antenna be used in conjuction with my APS30 unit or do I have to buy a separate antenna?

2) There is a Nokia 6310 car kit mounted on the side of the centre concole. It contects to a small speaker in passenger footwell. Incoming calls do not mute the radio and it seems all sound output is from this little speaker and not the car radio speakers.
My question is, where does this roof aerial connect to on the Nokia kit? (To me it seems as though the roof aerial is not connected to anything at the moment and someone added this Nokia kit not realising there was phone pre wiring already in the car.)

VIN: WDB2020292F858089

Thanks for any help.

 

[television]

I think that you will find it is a direct connection


273 installation kit for D net mobile telephone (с 01.03.1994)

 

[mr. shr]

I think that you will find it is a direct connection


273 installation kit for D net mobile telephone (с 01.03.1994)

Had a look at it all last night and yep it's a direct conntection from roof aerial to the phone cradle.
I found the Nokia control module under the metal plate in the passenger foot well. A couple of wires are not connected to anything (yellow and green).

I believe yellow is tel mute so I want to connect this up.
But there is already a cable in ISO A3. Can anyone tell me where this cable is likely to go/come from?

 

[stats007]

The pre-wiring doesn't include an outside antenna does it? I would have thought the current ISO connection is for the pre-wiring that resides under the centre console somewhere?

 

[mr. shr]

The pre-wiring doesn't include an outside antenna does it? I would have thought the current ISO connection is for the pre-wiring that resides under the centre console somewhere?

I have no idea what pre-wiring actually is.
I assume it means a roof antenna pre-installed as one of it's criteria, but what else it includes I don't know.

Perhaps, like you say, the tele mute cable in ISO A3 is also part of the pre-wire. So you think the wire I have in ISO A3 is just dangling freely behind the head unit?

Anyone confirm what telephone pre-wire actually includes?

 

[Diesel Benz]

On all models I know the telephone prewiring included the antenna. But this antenna would normally not support GPS, I understood you had an Audio 30 APS unit retrofitted. Otherwise prewiring would really be mostly the wiring harness for the cell phone kit (to allow retrofitting the full kit later on). The microphone could also be included but may not be part of it.

How does your roof antenna look like? From EPC, it looked like you might have a round one while the antenna that support GPS would have a "flat bubble" in front of the antenna tap.
http://www.detali.ru/cat/oem_mb2.as...GM=717.465&CT=F&cat=44V&SID=82&SGR=345&SGN=21


The mute wire must be there to make the car ready for the true MB OEM car kit. It might be floating (could test) but these should be open collector type, meaning you can have several drives connected to the same wire (if one applied mute, the radio would mute, if none did, the radio would not mute). To be safe, you could cut the wire and connect it to the Nokia car kit.

By the way, when did MB start using dual band antennas? Depending on your operator, you might want to check you have that.

 

[mr. shr]

On all models I know the telephone prewiring included the antenna. But this antenna would normally not support GPS, I understood you had an Audio 30 APS unit retrofitted. Otherwise prewiring would really be mostly the wiring harness for the cell phone kit (to allow retrofitting the full kit later on). The microphone could also be included but may not be part of it.

How does your roof antenna look like? From EPC, it looked like you might have a round one while the antenna that support GPS would have a "flat bubble" in front of the antenna tap.
http://www.detali.ru/cat/oem_mb2.as...GM=717.465&CT=F&cat=44V&SID=82&SGR=345&SGN=21


The mute wire must be there to make the car ready for the true MB OEM car kit. It might be floating (could test) but these should be open collector type, meaning you can have several drives connected to the same wire (if one applied mute, the radio would mute, if none did, the radio would not mute). To be safe, you could cut the wire and connect it to the Nokia car kit.

By the way, when did MB start using dual band antennas? Depending on your operator, you might want to check you have that.

The car was fitted with an Audio10CC but yes, I've just replaced it with an APS30.
I've just had a quick look behind the head unit. It doesn't look as though the cable in A3 is dangling loosely. Seems to disappear deep down behind the ashtray, so I'll need to remove more bits to be able to see where it goes.

My antenna is number 127 so looks like it's just gsm and not gps (as expected).

So if the car has prewire, do you know where they all go? What/where would you connect the MB OEM car kit to? Would they go to the amp (item 129)?
I'd rather try and work this out before I cut the cable to A3.

 

[Diesel Benz]

The car was fitted with an Audio10CC but yes, I've just replaced it with an APS30.
I've just had a quick look behind the head unit. It doesn't look as though the cable in A3 is dangling loosely. Seems to disappear deep down behind the ashtray, so I'll need to remove more bits to be able to see where it goes.

My antenna is number 127 so looks like it's just gsm and not gps (as expected).

So if the car has prewire, do you know where they all go? What/where would you connect the MB OEM car kit to? Would they go to the amp (item 129)?
I'd rather try and work this out before I cut the cable to A3.

The wire seems to go to the CTEL receiver/transmitter. I assume this is for older OEM car kits that are not able to use D2B. The control boxes are at the trunk at the rear, the wire should be going somewhere there. You could check with a multimeter if the wire is connected, if you are afraid of using it otherwise.

Do you have other D2B units on the car in addition to the head unit? If not, it would be simplest to place the cell phone interface box to the front, close to the radio. You would not need more than the fiber cables connected, the wake up signal, the microphone line and power to the interface unit, plus the cable from the interface box to the phone cradle.

I'm not sure but the latest phone model supported with a D2B system could be Nokia 6310i (or was UHI available for D2B?). You would also need the instrument cluster version coded to enable the steering wheel buttons and the display (not sure if those exist on a W202) but this you would need for the navi too (if there is this instrument cluster navi display option in your car). I would have one of these kits but I doubt you would want to come and pick it up.

If the car already has a non-OEM kit, I would assume it sufficient to complete that installation with the mute wire.

 

[mr. shr]

The wire seems to go to the CTEL receiver/transmitter. I assume this is for older OEM car kits that are not able to use D2B. The control boxes are at the trunk at the rear, the wire should be going somewhere there. You could check with a multimeter if the wire is connected, if you are afraid of using it otherwise.

What should I expect to see if I put a multimeter on pin A3?

Do you have other D2B units on the car in addition to the head unit? If not, it would be simplest to place the cell phone interface box to the front, close to the radio. You would not need more than the fiber cables connected, the wake up signal, the microphone line and power to the interface unit, plus the cable from the interface box to the phone cradle.

The car has a 6 disc changer in the boot, so does that count?

I'm not sure but the latest phone model supported with a D2B system could be Nokia 6310i (or was UHI available for D2B?). You would also need the instrument cluster version coded to enable the steering wheel buttons and the display (not sure if those exist on a W202) but this you would need for the navi too (if there is this instrument cluster navi display option in your car). I would have one of these kits but I doubt you would want to come and pick it up.

My 202 doesn't have the MF Steering wheel or the large display in the instrument cluster (do any?) so will not need to visit dealer for recoding!!

If the car already has a non-OEM kit, I would assume it sufficient to complete that installation with the mute wire.

Agree entirely, and that is probably what I'll do. I'd just like to find out where that existing wire goes before I cut it.

 

[Diesel Benz]

What should I expect to see if I put a multimeter on pin A3?

The car has a 6 disc changer in the boot, so does that count?

My 202 doesn't have the MF Steering wheel or the large display in the instrument cluster (do any?) so will not need to visit dealer for recoding!!

Agree entirely, and that is probably what I'll do. I'd just like to find out where that existing wire goes before I cut it.

If you disconnect the connector from the radio and measure the resistance (could do it against ground and plus voltage) and find it "infinite", the wire should be floating.

There is a specific order of D2B devices on the ring but it would still be possible to install the phone control unit to the front, next to the radio, just need to know if it should be place between the output of the head unit and the changer or the changer output and head unit input (don't remember without looking for it).

Seems you would not need instrument cluster version coding, you really are better than average to find the positive side of these car issues

 

[mr. shr]

OK, last night I removed the ashtray and head unit so that I could properly see what's what!!!
I found the telephone loom (with connector plug) just danling there not connected to anything. The other end of the loom disappears under the driver's side cable tray to (I assume) the CTel unit in the boot. (Didn't have time to remove driver's side footwell carpet to try and trace this loom)

Couple of questions:

Where exactly is this CTEL unit in the boot? Is it attached to the CD changer?

And, this cable that's dangling behind the head unit: what would that connect to? OEM phone cradle?


The more I dabble with this, the more I think I might try and complete the OEM installation.

Thanks.
shr.

 

[mr. shr]

Still can't find this telephone unit in the boot. (A34/4 in WIS)
Anyone know where it is on theirs?