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  #1  
Old 04-02-2005, 11:19 PM
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Angry Radio problems again

I'll try to make this as clear as possible. I HAD a pristine 93 190E with 50K miles. It was totalled by a sideswipe from a semi. I purchased a nice body 92 190E and swapped the engine/tranny and all is well. Now I'm working on the creature comforts. The 92 had an aftermarket radio tuner (Kenwood) head installed which did not work when I bought it - the faceplate was missing. I wanted to keep it OEM, so I pulled the console, restored the wiring back to original including the original console fader, and installed the Alpine head from my 93, which was working fine previously. I know the wiring is correct, have done all the continuity checks, but still have two problems. 1: no audio - right side, and 2: power antenna does not work at all. Since the head was fine in my 93 (everything worked correctly, and I'm positive I have the wiring back to OEM with no errors, the only difference I haven't checked yet is the amp in the trunk. I thought the amp was for the door woofers only, and have not swapped this out yet. Can the amp cause my two problems?? Oh, and I have also swapped out the rear and dash speakers from the 93 too, which were all working as they should, so I doubt if it's the speakers. Am I missing something? Gilly, you have been spot on in the past with my questions, but this one has me stumped. Thanks; Don
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  #2  
Old 04-03-2005, 03:29 AM
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For the antenna, check your connections at the switch and at the antenna itself. If all looks good, it might just be a bad switch or the antenna motor went. My antenna motor has went on me before. Also, check your fuses.

For the speakers, the amp only powers the door speakers. Did you check the fader switch to see if its slightly disconnected?
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Old 04-03-2005, 04:31 AM
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I would definately look into the fader switch most aftermarket installs in benzes bypass the fader. I would check to see if this is the case, it could also be that new speaker wires were run tot he speakers.

Sounds like quite a project you have endured to get back to what you had.

For the antenna, the easy way to test would be to make sure you have the right wire, make sure if the car has a dash mounted antenna switch that it is set to the up or auto position, and if that is not the case, check the antenna itself.

If the antenna is at fault it is most likely the relay unit for the antenna. or possibly the motor, and in some cases the mast is broken or the gears inside broke.

Alon
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  #4  
Old 04-03-2005, 01:15 PM
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Angry

Thanks all for the replies. Yes, it's been a lot of work, but I really like the 190E and since I only had 50K miles on the old one I figured it was worth saving.

It's not the fader; I even replaced it with another - same symptoms. If I force the BALANCE all the way to the right and crank the volumn all the way up, I can I hear weak audio from the right side. Sounds like the head unit has gone bad - again. Was working fine before the wreck before though.

I have no antenna switch on the dash on either vehicle. On my 93 the antenna went all the way up when I turned the Alpine radio on and retracted when I shut it off. Probably the antenna motor has gone bad; I can take the old one off. Much of a job? Haven't done this yet so don't know where to start. Where's the relay, and is voltage or a ground applied to the coil to move the antenna? Sorry, don't have a schematic. Don
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Old 04-03-2005, 04:37 PM
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antenna is simple. rmeove left side of trunk interioe panel. undo not on top of antenna. undo bolt inside trunk on bottom and unplug the wiring harness and pull the sucker out.

Have you tried a different radio to see if that is the problem?

Is it possible that your 93 had 2 amplifiers not one?

Alon
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  #6  
Old 04-03-2005, 06:15 PM
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Angry

Antenna problem solved but I feel like a jerk. Went to the garage where my 93 is with intentions of pulling the antenna off, looked at it, and it was slightly different. Some %&$*# had installed an aftermarket non-power antenna on the 92. Good reason why it didn't work. Thanks for the advice on removing the antenna - next weekend job - I'm tired.

Only one amp on the 93 in the usual place. Did any 93's have two amps?? I think it's the head unit. BTW, my 93 is in super shape, except for the drivers door and the roof is caved in. Gray exterior and interior. Lots of good parts. Email if you need something. Guys on this forum are the best. Don
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  #7  
Old 04-03-2005, 11:07 PM
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Don
If this has the right/left output on the back of the radio, you can swap them side to side to see if the problem switches to the other side (bad channel) or remains on the same side (speaker, amp, fader, etc).
MB actually offers a manual antenna for these and several others, for some owners it's a good compromise. Nice fit and finish.

Gilly
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  #8  
Old 04-03-2005, 11:32 PM
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Hi Gilly. Tried swapping the back of the tuner speaker outputs; the no right output problem remained. Did swap the right speakers, both front and rear. Noticed you mentioned the amp as a psooible culprit - this is the only component I have not swapped out. But I thought the amp was just for the door sub speakers. Could the amp be killing the right side output? If so, no problem changing out since I have a readily available parts vehicle which was operating correctly before the accident.
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  #9  
Old 04-04-2005, 06:19 AM
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Don
Well at least I'll admit if I'm not sure, and I'm not. The car might have the system called "Active Bass", then I'd agree it's a long shot it's the amp. It may not be this system though. I'd agree with the previous poster, be real careful about the fader switch, try to really inspect the harness between the radio and switch, may be butchered up at some point under the front of the console. I'm about to leave for work, I'd be willing to look at my diagrams tonight if you have the time. Another quick thought is if it has door speakers, maybe damaged wiring in the rubber conduit that leads the wires all in to the door.
Gilly
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  #10  
Old 04-16-2005, 10:43 PM
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Angry Radio/antenna Problems (Continued)

Still no right side audio; am looking for another CM2191 head unit even though it was working fine in the old benz. Continuity checks are fine, seems like everything I swap from my known working OEM 93 system (active bass, 93 to a 92 - sameo) doesn't work. Which brings up another problem.

Swapped out my known good power antenna - no up or down. The antenna I removed was an aftermarket non-power unit, but luckily the previous fool (I feel like the current fool) did not butcher the wiring, everything was intact. Swapped out and hooked everything back up to the OEM power antenna as normal. I know my blue wire in the head unit is connected, so what am I looking for on the OEM antenna blue wire when the radio is turned on to raise the antenna? GND or 12V? I see neither. It's parked in the DOWN position. I swear, swapping the engine and tranny was easier than fixing the electronics. Relay??

Checked all fuses and installed the correct amperage for all positions. They were not quite correct according to the cover, but only found one blown fuse, the aux fan fuse. Swapped all relays IN the fuse box, no help. Thought I might stumble across the antenna relay by doing this, but I'm not sure where it is. Where is it? This could be the problem?

Electrical problems remaining:

1. No right side audio out.
2. Antenna parked down.
3. One power window does not work, drivers side rear.
4. No console interior lights (Vent/AC buttons, etc). Dash cluster lights are fine, cigar lighter works also.

Anything common here? Many thanks for your help guys. Can't stand it when stuff is not working as it should......

Don
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  #11  
Old 04-16-2005, 11:05 PM
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I may take a few posts to answer all this as I search my disc for individual problems.
On the sound system, it appears the amp would only cause a problem with the bass speakers in the doors, not the normal dash and hatshelf speakers, they run right out of the speaker. Can you use a substitute speaker to verify output from the radio? i have some tiny ones I use for checking channels, with MB radio connectors attached, may have a spare one. I am still rather suspicious of the fader or connections at the fader.
EDIT: To clarify it looks like the trunk amps ONLY output is to the door speaker, although inputs tee off from the radio outputs to each side - and +. Unless the amp is shorting out the channel. Try disconnecting the amp from the sound system as a test.

Gilly

Last edited by Gilly; 04-16-2005 at 11:42 PM.
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  #12  
Old 04-16-2005, 11:13 PM
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Hey Gilly, thanks for the prompt reply. I have swapped all speakers at their locations (dash and rear deck) except the door subs, symptoms remain consistent. Have not tried plugging directly into the head unit, but my wiring continuity is fine, and have even changed out the fader pot. But I can do this, good idea. Antenna makes no sense either. This is driving me nuts. Time-wise, I'm nearing the time it took me to change out the motor and tranny. AAAAAAAAAARGH.......
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  #13  
Old 04-16-2005, 11:14 PM
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Antenna checks:
red wire from fuse 13, hot at all times
blue wire from radio, hot when radio is on.
brown is a ground wire, check for good ground.

May also be a modification required if antenna is a newer replacement, not sure what is neccesary to modify the antenna anymore. Think it has something to do possibly with the antenna switch on the dash, antenna was changed so it's either all the way or down, no more length "trimming" possible. If your car doesn't have a seperate antenna switch on the dash, I'd say disregard the possiblity this is the problem.
EDIT: NO relay, all handled in the motor.
Gilly

Last edited by Gilly; 04-16-2005 at 11:27 PM.
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  #14  
Old 04-16-2005, 11:26 PM
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On the window, especially the 201's are noted for wiring cracking in the conduit from the B post to the door itself. 1st step is to R&R the door panel and see if power is getting to the motor or not, DON'T touch anything, just TEST for power command to the motor. If no volts, THEN try gently pulling on the wires where they exit the conduit to see if one is obviously broken. If so, then I hope you're good with a soldering gun. I recommend putting in about a 12" patch through the conduit area as the wiring is already brittle, and making a repair that just ends up in the same bend point won't last. You want nice supple wiring inside the bend area again. Replace as many of them as you want, inspect for insulation cracking. You could of course also have a bad switch, power supply is OK if the right front works, as it's fused together (right front with left rear and vice-versa), a bad switch in the door will also make window quit fron the front switch. If power is getting through then of course it's the window motor.
OH and if no voltage and also apparent broken wire, you could still have a cracked wire but the insulation is still somewhat intact, may have to explore a bit more, loosen up conduit to inspect wire, you of course don't want to tug hard on the wiring trying to find a broken one ("careful what you wish for" policy I guess you'd say, as in "THERE, NOW you have a broken wire, dumass!" Fix the wire you just ruined, then you're back to step 1 trying to diagnose the problem. FUN let me tell ya. Does this sound like the voice of experience or what?).

Gilly
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Old 04-16-2005, 11:40 PM
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Illumination, I was kind of concentrating on a connector block called X5. Has power feed to it from the rheostat in the cluster and distributes variable power to these lights. Need a little more info on what does/doesn't work. You're saying nothing in the center console, such as the window switches and mirror switch, what about ash tray light, radio, climate control buttons, and any other switches near the radio and climate control (hazard flasher illumination, any other rocker switches?). I understand the lights in the cluster itself work, these don't tee off X5. Don't ask me where X5 is yet. I think it's behind the dash though attached to a crossmember, doesn't matter right now. OH, what about the switch for the sunroof and the outside temp indicator is fed off X5 also.
Get back to me on this and I'll see what my guess is.

Gilly
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