idstumped

Been on this site many, many hours using its invaluable information for fixing just about everything that has gone wrong with my 2007 ml500 except for this new problem. Can't seem to figure it out.
problem: right rear turn signal does not function
tried: changed bulb,
sanded connections,
tested socket with light tester with flasher on (no power),
unplugged cluster and tested plug with light tester with flasher on (no power at any pins),
unplugged left side cluster and tested plug with light tester with left flasher on (power at 2nd pin),
took SAM apart - looks good, no corrosion,
read codes got "component E4e1(right turn signal lamp) or the line to the component has a short circuit to positive or open circuit",
with tester on live mode Rear SAM it displays "E4e1 the right turn signal lamp" going off on off on.

Could someone please point me in the direction I should be going. Thought it might be the SAM but seems to pass the test, maybe I'm reading it wrong.
Thanks

Maj. Dundee

What is the message on the Instrument Cluster?

Did you check for codes in all modules?

Maj. Dundee

Go to the rear SAM and locate conn. "D", wire #6 Grn/Blk.

Using a test light properly grounded, touch pin and have someone turn on right signal. What are the results?

idstumped

Fantastic reply with exactly the info I was looking for. I searched for that wire but couldn't find detailed info on the SAM connections.
I will try as you mentioned and report back later after work.
Am I correct to assume it should be flashing?

idstumped

What is the message on the Instrument Cluster?
-Turn signal rear right-

Did not check codes for all modules

Had a helper cycle the key and put on turn signal. No flashing at pin #6 on the SAM or any other pin while right turn signal in on. Left turn signal flashed at its' pin (#1?) with left turn signal on.
Same results when I have 4 way flashers on.

Maj. Dundee

Yes.

Maj. Dundee

Yes.

Maj. Dundee

2006-2009 MLs had faulty tail lamp seals installed at the assembly plant. You will have to check for water intrusion in the spare tire area. See my post just a few days ago.

https://mbworld.org/forums/m-class-w...ml#post7589072

idstumped

Does not seem to be any water getting in the trunk compartment.
SAM circuit board has no apparent corrosion on it.

Maj. Dundee

Did you remove everything?

idstumped

I was in there changing my shock absorbers at the same time so I have a good space to see the SAM and it's surroundings. No water in the space.
I removed the SAM and opened it up to check for corrosion, the board was perfectly clean.

Maj. Dundee

OK

idstumped

I have no flashing on pin #6 (or on any other pin) when turn signal is on. Placed properly grounded tester directly on pin #6. Any other suggestions? Why does the OBD scanner show the turn signal going on and off, on and off but in reality the SAM is not sending any current to the bulb?

Maj. Dundee

Why the scanner is showing that result, I do not know. Are you using a test light and is it making contact with the wire? You must retest.

Maj. Dundee

What's the outcome?

idstumped

Retested with similar results:
driver side turn signal on: power @ harness (black wire)
power @ SAM 1st pin right

Passenger side turn signal on: no power @ harness all wires
no power @ SAM all pins

Hazard flasher on: power @SAM 1st pin only

Exterior lighting live data on scanner shows passenger flasher going on and off

dash cluster shows right turn signal fault

Scanner shows stored fault9133, same fault as shown in previous posts.

Should I be checking anywhere else?

Maj. Dundee

Does the mirror signal lamp flash on the right side?

idstumped

Quite positive it does because I was thinking about the consequences of wiring the back flasher to it.
I'll double check tonight.

Maj. Dundee

How long does it take to see if it blinks?

And don't think about jumping the wires because the size of the wires are different.

Do all the other lights on the right tail lamp work?

hyperion667

idstumped

All other exterior lighting on vehicle work as they should. Only the right back turn signal doesn't have power.

Maj. Dundee

There are only two possibilities, the Combination Switch on the steering column or the rear SAM.

idstumped

If the switch was faulty wouldn't it fail for all right side flashers?
Also, have the same problem when four way flashers are on (no back right flasher only)

Maj. Dundee

Here is the diagram of the stalk on the column that controls everything.

S4s1 controls the right and left turn signals. Meaning one wire controls the right and left turn signals. It could very well be that the switch is not sending a signal to the rear SAM for right turns.

idstumped

Can I test at the rear SAM to determine if it is getting a "turn right" command from the switch on the steering wheel?
Curious of where my scanners "live data" gets its info from.
Live data from rear SAM shows flasher working????