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w124 CCU wiring disaster. need pinout or picture
today im working on a 1987 300td that had been left in the wrong hands at some point. there was an issue with the klima and or compressor tach pickup so they decided to start cutting wires behind the dash and ran some jumper all the way from being crammed in a pin for the klima to some random toyota relay that was triggered from some of the wires that come off the CCU plugs the blower had a mind of its on even when the CCU was "off" and the compressor ran only on the "economy" setting so it was just an absolute mess. i am putting it back together as factory and going from there. but while trying to replace a couple of the pins on each of the 2 big plugs that go on the CCU, all the wires decided to leave their spots when i turned my back! this is on the drivers side plug. does anyone have a wiring pinout that has colors stated or a good picture or so of each plug so i can see where these need to go? i would like both plugs if possible because i can tell they have been popped open and i don't trust the last person who touched this. but don't loose your's either trying to get a picture! Thank you!
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83 300CD- sanden, dual p/f condensers, 160a alternator, ect 91 300TD- 722.6, #22 head, 3.5L IP, w140 manifolds, ect |
#2
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Page 301 is the beginning of CCU diagrams.
Wiring Diagrams These diagrams are a bit easier to read. Its for 1992 but all the CCU info is the same. http://www.autolib.diakom.ru/CAR/Mercedes-Benz/1992/300D/SYSTEM%20WIRING%20DIAGRAMS/4100.pdf http://www.autolib.diakom.ru/CAR/Mercedes-Benz/1992/300D/SYSTEM%20WIRING%20DIAGRAMS/4101.pdf Good luck.
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CENSORED due to not family friendly words |
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Quote:
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83 300CD- sanden, dual p/f condensers, 160a alternator, ect 91 300TD- 722.6, #22 head, 3.5L IP, w140 manifolds, ect |
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Be careful, they changed the climate control in 90 as far as the aux fan control goes. These are all in the "right" connector. The "left" connector is the same across the W124 range.
Pre 90, the CCU gets a binary signal from the head sensor that shuts down AC at excess temperature. Another switch in that same sensor goes to the aux fan relays. 90 and after, the CCU gets an analog signal from a thermistor sensor in the head. It does the overheat decision and also triggers the fan relay. The wiring diagram you need can be found at w124-zone.com, you'll have to register but it's free.
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The OM 642/722.9 powered family Still going strong 2014 ML350 Bluetec (wife's DD) 2013 E350 Bluetec (my DD) both my kids cars went to junkyard in 2023 2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles) 2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles) 1998 E300DT sold to TimFreeh 1987 300TD sold to vstech Last edited by jay_bob; 09-12-2014 at 11:28 AM. Reason: Breakpoint was 1990 not 1989 |
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Quote:
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83 300CD- sanden, dual p/f condensers, 160a alternator, ect 91 300TD- 722.6, #22 head, 3.5L IP, w140 manifolds, ect |
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if anyone was curious what it looked like... this was after the weird relay and all the wires from behind the CCU to the klima relay were cut out. there is more of this kind of stuff the more i dig
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83 300CD- sanden, dual p/f condensers, 160a alternator, ect 91 300TD- 722.6, #22 head, 3.5L IP, w140 manifolds, ect |
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Derp!
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http://i284.photobucket.com/albums/l...aman/Fleet.jpg Peach Parts W124.128 User Group. 80 280SL 85 300SD 87 300TD 92 300D 2.5 Turbo 92 300TE 4Matic |
#8
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Daaaang. Some people just should not touch controls.
I would seriously look into finding a replacement wiring harness. Or invest in a good soldering iron, heat shrink, and a heat gun. Engine bay harness between a 300D and 300TD should be identical. Dashboard harness should be almost the same. I wonder if they made the wagon-specific items on a different body harness.
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The OM 642/722.9 powered family Still going strong 2014 ML350 Bluetec (wife's DD) 2013 E350 Bluetec (my DD) both my kids cars went to junkyard in 2023 2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles) 2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles) 1998 E300DT sold to TimFreeh 1987 300TD sold to vstech |
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the hvac electrics are working well now after some soldering and heat shrinking any wires that they used a knife to strip the insulation back and probe around until they though they found the compressor turn on signal too the klima relay. poor wagon and the funniest part is... i am no the new owner of it! so i am the new owner of an 87 300td! i have wanted an SDL since i sold my 300sd awhile back. was very interested in the 603 and was greeted with (drum roll) a blown HG or cracked head . i will be posting a new topic in the diesel discussion about that whole thing and being new to both the the w124 and 603 unexpectedly haha! back on topic to MY wagons wiring the wiring is plugged in and seems to be working except the fan always seems to be on a very low speed when it should be off. is this normal for constant ventilation or something or do i have something wired wrong? all fan speed settings seem to work. i will test with a few different CCU's. and there is no illumination on any CCU i have tested. i will recheck the connection for that too. everything will be sleeved and tided up once everything works and a crack free dash is installed with rebuilt pods. can i rebuild the pods with the performance analysis ones? how many are there total? the connection that goes inside the box works and the oval one in front works. has anyone just closed off the recirc door with zip ties and done away with it? both pods are shot and the linkage for is all messed up. it such a pain to get to even with the top thing off for the dash vents!
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83 300CD- sanden, dual p/f condensers, 160a alternator, ect 91 300TD- 722.6, #22 head, 3.5L IP, w140 manifolds, ect |
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This might be a good time to do the infinitely variable blower fan mod.
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CENSORED due to not family friendly words |
#11
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Yes the fan always runs at least on low speed unless you push the 0 button.
Chapter 83-600 in the FSM explains it all including the location and function of the vacuum pods.
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The OM 642/722.9 powered family Still going strong 2014 ML350 Bluetec (wife's DD) 2013 E350 Bluetec (my DD) both my kids cars went to junkyard in 2023 2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles) 2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles) 1998 E300DT sold to TimFreeh 1987 300TD sold to vstech |
#12
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i saw that awhile back and it is for sure on my to do list!
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83 300CD- sanden, dual p/f condensers, 160a alternator, ect 91 300TD- 722.6, #22 head, 3.5L IP, w140 manifolds, ect |
#13
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this seems to run on low when the "o" is selected
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83 300CD- sanden, dual p/f condensers, 160a alternator, ect 91 300TD- 722.6, #22 head, 3.5L IP, w140 manifolds, ect |
#14
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My 87 CCU had this problem also. I replaced it with a JY 91 or 92 CCU from a 300e which fixed it. Mine also failed to shut off the AC compressor.
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CENSORED due to not family friendly words |
#15
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interesting. ill try some more ccu's. so i decided i'm going to remove the hvac box and install a new evap so i won't have to pull the dash again because i find it leaks. also a good chance to clean everything very well! i found 2 beautiful black w124 dashboards but they have the passenger airbag. can this be removed so i can install the glove box liner and door like on the old dash? any other differences in the later dashboards? i love the wood on it too so i'll be finding a glove box door with it if this dash will support it!
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83 300CD- sanden, dual p/f condensers, 160a alternator, ect 91 300TD- 722.6, #22 head, 3.5L IP, w140 manifolds, ect |
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