Ok so my brother brought home a preaty beat up 240D the other day and we're have to go through it before he moves in a few days so time is short.
My father just went to the store to pick up brake pads and I just finished reattaching the steering column which was hanging off it's mount (I have no idea why it was detached in the first place )


The question is this. There are wires under the dash that were not attached but also don't seem to go anywhere. I'm new to the W123 so I'm flummoxed about where are are supposed to go. I don't see any obvious attachments for that big 10 pin connection plug....



The big wire coming down from the steering column either attaches to the cruise control or the control stock but we can't tell which it is.

The connection on the left is the biggest nightmare. When it came in all the wires were covered with electrical tape. We pushed them into that plug for safeties sake but we have no idea what order they good in.

Related symptoms-The high beams work but none of the turn signals work even though the bulbs are fine. I get the feeling that the big 10 pin connector goes into a relay that is missing for some reason. Also the hazard switch is disconnected...

Again sorry that I haven't searched but time is against us on this one. Any help will be most appreciated.

(The big ugly red wire is for the aftermarket stereo)

__________________
1982 300GD Carmine Red (DB3535) Cabriolet Parting Out
1990 300SEL Smoke Silver (Parting out)
1991 350SDL Blackberry Metallic (481)

"The thing is Bob, its not that I'm lazy...its that I just don't care."

Well at least one of them is the for the cruise amp, which is attached to the not-pictured bottom panel on manual cars instead of bolted up in the dash as usual.

The connector on the upper left with the purple and black/yellow wires may be from the stalk and control some things like wipers, high beams etc.

If the cruise amp was removed, then you should have an extra 10- or 14- pin connector that would have married up with that. Can you find a Bk/Gn/Red wire from the clutch pedal switch to a connector? That connector is the CC amp connector.

The box on the far upper left that looks connected should be the warning module, if that helps by process of elimination of what's still there and connected.

Ok here we go (Numbered the question areas) I thought #1 was the cruise control amp but now that I think about it I saw that my friends 280CE has the cruise amp mounted on the bottom panel. So what is #1 than?

#2 was just a bundle of wires until we put them into that clip for safety. No doubt that it's wired wrong.

The back of #4 is completely exposed which leads me to believe that someone tried to fix something but didn't do it correctly.

My gut tells me that we're missing a relay for the turn signals.

__________________
1982 300GD Carmine Red (DB3535) Cabriolet Parting Out
1990 300SEL Smoke Silver (Parting out)
1991 350SDL Blackberry Metallic (481)

"The thing is Bob, its not that I'm lazy...its that I just don't care."

#1 looks to be the warning module

#4 comes down from the stalk/steering column and should be horns, signals, wipers

Do these match up with that?

C106
Pin Color wire
1 Wt/Yl (HL flasher)
2 Wt (flsh hi)
3? Yl (flsh lo)
4 Bk/Yl (horn)
5 Bk/Yl/pk (horn)
6 Bk/Wt (L signal stalk)
7 Bk/Gn/Wt (signal power stalk)
8 Bk/Gn (R signal stalk)
9 Bk/Yl (wiper)
10 Bk/Pk/Vi + Vi/Yl (washer
11 Bk/Vi (wiper )
12 Bk/Bu/Vi (lo wiper)
13 Bk/Gn/Vi (hi wiper)
14 Bk/Yl/Vi (wiper)

You should have another connector in there with connectors for other lights:

C104

1 Rd/Wt/Yl (clock/trunk)
2
3 Bu/Gn (low fuel)
4 Bu/Bk (fl gauge)
5 Bk/Wt (L signal)
6 Gy/Yl (backup)
6* Bk/Gn + Gn (cruise - typo?)
7 Bk/Gn (R signal)
8 Bk/Rd (brakes)
9 Gy/Vi (marker lights
10 Gy/Bk (lt rr)
11
12 Gy/Rd (Rt rr)
13
14 Bk (defog)

Is # 3 "the big 10 pin connector?" That may be a cruise connector. Gotta year for the 240?

For hazards/turn signals - I think depending on year the relay may be part of the switch, so if it's disconnected or busted, that may mean no turn signals.

Edit: older flasher is part of the switch, newer flasher is separate; but the switch is still a pass-through for power to the signals and needs to be plugged in. It may be dirty/stuck. Cycle it a few times then re-install.

And of course - check all fuses. Twice.

You may also want to pull the instrument cluster (or look up from underneath) to verify that the wires in #2 aren't supposed to connect to the back of the cluster. If it was disassembled, it may be the circular connector for the back of the cluster. It looks a little short, but it's tough to say.

What year is the 240D?

__________________
- '79 240D - engine swap complete! Engine broken in! 28-31 mpg! Lovin' the ride!
- '86 190D (W201-126) - 2.5 NA engine, 5 speed, cloth interior, manual climate controls, 33-34 mpg (sold to forum member).

1982 (I'm pretty sure, I need to double check to make sure it isn't an 83)

Ok with the help that I got here I think i've got this figured out.


1. Warning Module
2. --------------
3. Cruise control connection
4. Thus making this one the plug for the cruise control switch
5. You can't tell but these are the old speaker wires.

Thus #2 is the culprit as to why the turn signals aren't working. Looks like we're missing the relay for it (Why anyone would pull that relay and leave the wires wrapped in electrical tape is beyond me.....) Now to find a relay and begin the hard part; figuring out where those 6 wires are supposed to actually go within that plug.

__________________
1982 300GD Carmine Red (DB3535) Cabriolet Parting Out
1990 300SEL Smoke Silver (Parting out)
1991 350SDL Blackberry Metallic (481)

"The thing is Bob, its not that I'm lazy...its that I just don't care."

Definitely 82 carpeting there...

Hmm, that's strange; fastlane shows that the turn signal relay has 4 connections, instead of the six that we have.
Part # W0133-1628944

What am I missing here?

Since its a stick, I think #2 is the single point relay that mounts above the steering column. If you look at the bracket, not shown in the photo, you'll see it has a cutout in its floor to accept the back of the connector; then the relay plugs in from above.

There is also a double contact relay. Both control the A/C circuits.

__________________
--frankb

1982 300TD 617.912 <NLA> . 1975 2002 E10-EFI . 1976 914c6 . 1983 MG LMIII <NLA>. 1988 Montero / 616<NLA> . 2001 TLS . 2005 Saab 9-5 Wagon

MY most frequent reason is forgetting to plug the hazard switch -- or its harness, which the signals need for operation.

__________________
--frankb

1982 300TD 617.912 <NLA> . 1975 2002 E10-EFI . 1976 914c6 . 1983 MG LMIII <NLA>. 1988 Montero / 616<NLA> . 2001 TLS . 2005 Saab 9-5 Wagon

Really? That does help a lot (There is no hazard switch but the plug is in the dash) I assumed that it connected to the same relay but I didn't know that the turn signals would not work without it. Looks like I have to add that to the list.

__________________
1982 300GD Carmine Red (DB3535) Cabriolet Parting Out
1990 300SEL Smoke Silver (Parting out)
1991 350SDL Blackberry Metallic (481)

"The thing is Bob, its not that I'm lazy...its that I just don't care."

The blinker relay is supposed to be in the center console, not under the dash. Four (or three functional) pins is all it has.

Basic info, like how many pins in each connector in the pic would be helpful.

Isn't #4 two items plugged together?

How many wires in #2? Six?