E320 16 PIN DTC Charts inc. pin 8, pin 14 - PeachParts Mercedes-Benz Forum

Ron Johnstone · #1 03-26-2007, 08:16 PM

Oh, such a fun afternoon. I built the code reader and it wouldn't work. Tried switching components, still wouldn't work. Turned out that I had 2, yes TWO different, new, momentary switches that were both leaking a bit of voltage so the LED was always on no matter the switch position. Put a household toggle switch in the circuit and the code reader works like a charm. BTW, Radio Shack has a 12V LED in an assembly that is easier to use than the plain one. p/n 276-270A, $1.99

lebstyle · #2 05-13-2007, 03:49 PM

hi i built that code reader to spec as was noted.
when i hook it up it the led turns on for a second then burns out, i tried it twice.
any ideas? thanks

Arthur Dalton · #3 05-13-2007, 05:04 PM

Quote:

Originally Posted by lebstyle

hi i built that code reader to spec as was noted.
when i hook it up it the led turns on for a second then burns out, i tried it twice.
any ideas? thanks

See your other post...

Ron Johnstone · #4 05-13-2007, 05:34 PM

You must have the wrong LED - one without the built-in resistor. Frequently you will find misfiled/mislabeled parts at Radio Shack.

Arthur Dalton · #5 05-13-2007, 05:41 PM

Both LEDs listed to be used in my diagram are 12v leds. I specifically put the RS part# in there for the purpose of not having someone with a few regular leds at home to just go get a sw and leads.
The 276-270 is an encased version and the -209 requires mounting.
The 276-270A mentioned in a post here is non-existant..the correct # is as stated/shown in the diagram as 276-270/12v

Also , be aware that leds are polarity sensitive.
So, pay particular attention to the pos. + sign at the LED in the diagram..

http://members.aol.com/ajdalton7/ledtool.jpg

BeachGuy · #6 06-04-2007, 02:48 PM

Are the code numbers for a 1994 E320 wagon the same as posted earlier under E320 16 PIN DTC Charts inc. pin 8, pin 14 posting.
Thanks, for any help.
Beachguy
1994 E320 Wagon with 117,400 miles

Arthur Dalton · #7 06-04-2007, 02:49 PM

Same

iceman805 · #8 08-09-2007, 03:16 AM

Quote:

Originally Posted by Ron Johnstone

Oh, such a fun afternoon. I built the code reader and it wouldn't work. Tried switching components, still wouldn't work. Turned out that I had 2, yes TWO different, new, momentary switches that were both leaking a bit of voltage so the LED was always on no matter the switch position. Put a household toggle switch in the circuit and the code reader works like a charm. BTW, Radio Shack has a 12V LED in an assembly that is easier to use than the plain one. p/n 276-270A, $1.99

I just hit my first code warning on my 95 E300D....I switched batteries with my 85 300D and now my radio just states "code".
Okay, I now understand I have "radio code" issue and barked up the wrong tree here. good grief...now I need to find radio pulling tools since I didn't get any documents with the car.

When I connect the negative to 1 and positive to 16 all i have to do is press the switch and the led lights up. Is that what is supposed to happen? I insert the third banana plug in 8, leave it on for 15 seconds while nothing flashes and nothing is cleared.
However, I'd still like to know if I assembled the code reader correctly. Is it supposed to generate a constant glow without insertion of the third (middle) lead into either 8 or 14?