W202 C250D no AM on radio

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Tony From West Oz
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Posts: 3241
Joined: Mon 20 Jun, 2005 9:04 pm
Model you own: w202
Location: Bedfordale WA

W202 C250D no AM on radio

Post by Tony From West Oz » Sun 13 Jul, 2014 7:24 pm

We have 2, W202 C250Ds and one has the MB radio and the other a Eurovox radio.
The MB radio in my wife's car has no AM reception unless you are close to the Transmitter station (20Km max). FM works fine but the CD stacker is not recognised by the radio. We have not tried the Compact Cassette operation.

I wanted to upgrade the Eurovox radio in my W202, so I bought a Kenwood AM/FM CD player with Bluetooth and USB player.
I installed it easily enough, but I now have no AM reception. All other functions work correctly. A wire plugged into the Antenna socket of the radio gives me AM reception, but no AM when on the Antenna cable.

Is there a known issue with these Antenna / Amplifier combinations, which would give these symptoms ?
Does anyone have an aftermarket radio with AM reception working in a W202?
Did you have to install another antenna?

Any advice would be appreciated as I really would like to have the AM band working in each of our cars, but hesitate at drilling into the bodywork.

Regards,
Tony
Life is a journey, with problems to solve, lessons to learn, but most of all, experiences to enjoy.

'83 W123 300D 325000km (Wife's car Josephine - sold).
'84 W123 300D replaced good OM617 912 with OM617 952 and enjoyed having good acceleration for the first time since first driving a 300D in 2002 - became engine and trans donor for 300CD Turbodiesel conversion. Now parted out.
'86 W124 300D sold (Wife's old car - sold )
'85 W123 300CD, 275 000km (Fatmobile) rebuilt turbodiesel from previous Fatmobile transplanted into 280CE (SOLD)
'99 W202 C250 Turbodiesel (my darling Wife's car - Sold)
'98 W202 C250 Turbodiesel (my car - Sold)
'06 Ssanyong Musso Crew Cab 2WD Ute (OM662 diesel and Auto Transmission)

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Tony From West Oz
OZBENZ moderator
Posts: 3241
Joined: Mon 20 Jun, 2005 9:04 pm
Model you own: w202
Location: Bedfordale WA

UPDATE: W202 C250D no AM on radio

Post by Tony From West Oz » Sun 13 Jul, 2014 8:32 pm

OK,
I should have searched before posting, but no problem, here is the answer to my question:
viewtopic.php?f=31&t=10201
Update problem solved. Put the JVC head unit in, still the same poor reception no AM reception. Whilst I had it out and wired up I decided to put power to the Antenna control, now why would I do that seeming it's a hidden antenna and doesn't need power to raise the antenna now does it? Well low and behold the radio sprang into life. Beautiful AM and FM reception. The Blue and white antenna wire needed power to boost the signal. So I connected the antenna control wire from the JVC head, and the intire system is now working perfect. For others information the C200 wiring color code is as follows.
Brown/Earth, Pink & Green/constant power, Red/ Accessory power, Grey & Blue/light control when lights are switched on, Blue & White Antenna trigger in my case antenna booster. There is also a Green and Purple wire which is unknown to me, if anyone knows what this is for please let me know
This explains why my new car radio has no AM.
Tomorrow, I shall check my car radio wiring and add the antenna control. Than I will check my wife's car stereo system for this issue. Hopefully that will fix here and mine also. It may not be the case as hers is a factory fitted radio, not an aftermarket one.

I hope this helps someone else.

Tony
Life is a journey, with problems to solve, lessons to learn, but most of all, experiences to enjoy.

'83 W123 300D 325000km (Wife's car Josephine - sold).
'84 W123 300D replaced good OM617 912 with OM617 952 and enjoyed having good acceleration for the first time since first driving a 300D in 2002 - became engine and trans donor for 300CD Turbodiesel conversion. Now parted out.
'86 W124 300D sold (Wife's old car - sold )
'85 W123 300CD, 275 000km (Fatmobile) rebuilt turbodiesel from previous Fatmobile transplanted into 280CE (SOLD)
'99 W202 C250 Turbodiesel (my darling Wife's car - Sold)
'98 W202 C250 Turbodiesel (my car - Sold)
'06 Ssanyong Musso Crew Cab 2WD Ute (OM662 diesel and Auto Transmission)

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Ivanerrol
Mercedes Demigod
Posts: 5872
Joined: Sat 12 May, 2007 2:21 pm
Model you own: w204
Location: Melbourne

Re: W202 C250D no AM on radio

Post by Ivanerrol » Sun 13 Jul, 2014 9:06 pm

If it's like the same era W210's, the antenna is in the rear window. The wires you see above the window demisting wiring.
The amplifier gives extra boost for the AM reception. In the W210 this amp is located in the rear drivers pillar - I assume it maybe in the same location in a W202.
The Blue wire powers the amp. Power only goes to the amp when the head unit is on.
If you have an aftermarket headunit in the car you need to make sure there is constant voltage going to this amp for AM reception.
In my W210 the antenna lead from the Pioneer does this.

I had problem with my AM reception in the W210 and bought a new antenna amplifier before finding out that the Blue wire had become detached. - I now have a spare antenna amp.

In around 2000 MB realised that the window antennas were not such a grand idea and repositioned the antenna to the little plastic thing above the middle of the rear window.

Whatever you do, hope and pray that you never need to replace the rear window if you have one of these rear window antenna setups $$$$$$$
W211 - E240
W204 - C280
Departed
W202 - C200, C180, C180
W126 - 380SE , 380SE (Ex SA Import), 560SEL
W124 - 300e, 260e (ex Japan)
W111 220s (Indonesia) 4 speed manual column shift
W123 230
W116 450SEL
W140 420SEL
W210 E240, E240
W209 CLK 240
W201 190e 2.6 (ex U.K.)

User avatar
Tony From West Oz
OZBENZ moderator
Posts: 3241
Joined: Mon 20 Jun, 2005 9:04 pm
Model you own: w202
Location: Bedfordale WA

Re: UPDATE: W202 C250D no AM on radio

Post by Tony From West Oz » Mon 14 Jul, 2014 8:28 pm

Tony From West Oz wrote:OK,
I should have searched before posting, but no problem, here is the answer to my question:
viewtopic.php?f=31&t=10201
Update problem solved. Put the JVC head unit in, still the same poor reception no AM reception. Whilst I had it out and wired up I decided to put power to the Antenna control, now why would I do that seeming it's a hidden antenna and doesn't need power to raise the antenna now does it? Well low and behold the radio sprang into life. Beautiful AM and FM reception. The Blue and white antenna wire needed power to boost the signal. So I connected the antenna control wire from the JVC head, and the intire system is now working perfect. For others information the C200 wiring color code is as follows.
Brown/Earth, Pink & Green/constant power, Red/ Accessory power, Grey & Blue/light control when lights are switched on, Blue & White Antenna trigger in my case antenna booster. There is also a Green and Purple wire which is unknown to me, if anyone knows what this is for please let me know
This explains why my new car radio has no AM.
Tomorrow, I shall check my car radio wiring and add the antenna control. Than I will check my wife's car stereo system for this issue. Hopefully that will fix here and mine also. It may not be the case as hers is a factory fitted radio, not an aftermarket one.

I hope this helps someone else.

Tony
Success!
Both cars now have working AM/FM radios, CD Player with Bluetooth and USB drive.
I have removed the old CD stacker from the boot of each car - Anyone want one?

I have recorded the wiring Colours for our W202's:
Ground - Brown
+12V - Red / Blue stripe
+12V Ign. - Red / Blue stripe
Antenna/Amp control Blue / White stripe

Speaker colour codes (second wire is always main colour plus Brown stripe)
# Left Front - Green
# Right Front - Orange
# Left Rear - Pink
# Right Rear - White

I hope this is of use to others who wish to install a more modern radio in their car.

Regards,
Tony
Life is a journey, with problems to solve, lessons to learn, but most of all, experiences to enjoy.

'83 W123 300D 325000km (Wife's car Josephine - sold).
'84 W123 300D replaced good OM617 912 with OM617 952 and enjoyed having good acceleration for the first time since first driving a 300D in 2002 - became engine and trans donor for 300CD Turbodiesel conversion. Now parted out.
'86 W124 300D sold (Wife's old car - sold )
'85 W123 300CD, 275 000km (Fatmobile) rebuilt turbodiesel from previous Fatmobile transplanted into 280CE (SOLD)
'99 W202 C250 Turbodiesel (my darling Wife's car - Sold)
'98 W202 C250 Turbodiesel (my car - Sold)
'06 Ssanyong Musso Crew Cab 2WD Ute (OM662 diesel and Auto Transmission)

Budgie
Dernburg Wagon
Posts: 6
Joined: Sun 01 Jan, 2017 1:46 pm
Model you own: w124

Re: W202 C250D no AM on radio

Post by Budgie » Sun 01 Jan, 2017 7:26 pm

Hi Tony, I realise its an old post, but do still have a CD stacker you'd like to part with?

Regards
Greg

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