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The right turn signals (front and back) and the arrow indicator on my wife's 96 E320 don't work. The hazard lights and the left turn signal work fine. I can hear the K1 relay clicking at about 4 times the normal rate when I try the right turn signal. Replaced the bulbs just to be sure. Does anyone have a wiring schematic? Any ideas as to what might be wrong? Thanks for any help.
 

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1997 Mercedes-Benz E420
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139 Posts
have you checked your fuses (for turn signals/hazards, there is one fuse located in the fuse box on the drivers side compartment and one located under the hood)
this happened to my car after i installed turn signal mirrors and was pleased to find out that the fuse under the hood for extra turn signals and turn signals had blown because i didnt up the fuse for the new signals that were added on, except for me the left one didnt work and the right worked fine.
also if it is blown i would make a quick check around to make sure all the bulbs are appropriate for the car, at an inspection sticker site, one of my brake lamps were blown so they put a bulb that drew too much energy compared to what should have been in one of my brake lamps (i think the driver's side it was) and upon hitting my brakes, it managed to blow the other side and the one in the 3rd brake signal damn near obliterating the contacts for the 3rd brake light
the turn signal wires run alongside the rails of the car (the carpet pulls back from near the door sills) but be careful not to damage anything, but i doubt the wires there would be damaged, i would inspect around the wiring harness plugs into the front/rear signals first after i checked the fuses if they were okay
 

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Discussion Starter #4
Thanks for the replies. I replaced the bulbs. I'll make sure the fuses are OK. Does anyone have a turn signal wiring diagram? Thanks again.
 

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1996 E320
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Good luck on finding any wiring diagrams. I'm ready to just buy one of the manuals, thinking about the CD-ROM that's supposed to cover EVERYTHING from year X to year Y.

I can tell you that my '96 E320 has the passenger rear turn signal driven by a black wire with a thin green stripe. My turn signals (all the way around) quit right after an engine swap, and the passenger side tail light, tail/brake light, and front parking light all won't work. Bulbs are perfect.

I'm hating the prospect of tracing the wiring.

Tail lights and front parking light on the passenger side are on a gray wire, red stripe.
 

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1996 E320
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K40 or K1 Relay???

I've been searching so much I'm getting dizzy.

In the '96-'97 model years, which relay controls the turn signals? Some threads point to the K40, others the new-for-1996 Combination Control Unit.

For that matter, the front parking lights too? Which relay/unit(s)?

Thanks and please pardon the partial thread highjack.
 

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02 ML320 06 ML500
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There are no relays which operate the turn signals. They are operated by simply switching B+ voltage to the appropriate circuit.

Look at the diagram and I have started a blue tracer for the right side turn signal circuit (Blk/Grn wire) which goes to the combo witch on the steering column.

Current to the switch is supplied by the Blk/Gen/Wht wire. So if the left side works correctly we can assume that current to the switch is not the problem

Access the connector to the combo switch, key on, fashion a jumper wire and jumper the Blk/Grn/Wht wire to the Blk/Grn wire. If the turn signal lights then your problem is with the combo switch.

If it does not light, then you probably have a problem with the Illumination Control Module or one of the grounds at the bottom of the diagram. Remember only leave the jumper wire connected until you verify. Remove ASAP.

They had a problem with bad solder joints in the ICM.
 

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1996 E320
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Thanks, 43 sqd. That should help both of us.

Unlike the OP, mine are not working at all, either side.

I have passenger rear tail lights not working on top of it all. The .pdf you posted will help with that too.

If you don't mind, I'm not seeing anything behind the driver's side panel (up where the light switch, etc. is) that looks big enough to have the 22 leads shown for the Illumination Control Module. Do I need to spend more "quality time" under there and poke a light up there, or is it somewhere else on the 1996 E320...like to the side... How big is the Illumination Control Module?

There's already one door panel off right now with my kid looking into erratic passenger seat controls, and I'm trying to avoid having everything torn apart all at once...
 

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02 ML320 06 ML500
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Thanks, 43 sqd. That should help both of us.

Unlike the OP, mine are not working at all, either side.

I have passenger rear tail lights not working on top of it all. The .pdf you posted will help with that too.

If you don't mind, I'm not seeing anything behind the driver's side panel (up where the light switch, etc. is) that looks big enough to have the 22 leads shown for the Illumination Control Module. Do I need to spend more "quality time" under there and poke a light up there, or is it somewhere else on the 1996 E320...like to the side... How big is the Illumination Control Module?

There's already one door panel off right now with my kid looking into erratic passenger seat controls, and I'm trying to avoid having everything torn apart all at once...
It says under the left side dash area. Let me see if I can find a photo.
 

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02 ML320 06 ML500
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Understand that I do not own an E320/210 model and by the looks of this photo it is behind the headlight switch or part of the headlight switch. Make sure all the wires correspond with the diagram wires.
 

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1996 E320
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THANKS!!

Yup, was digging around and instead of the usual bar-type unit, there is a trapezoidal plug socket with a series of cables running in. Wire trace/color codes confirmed it.

Most of that box is to the right (driver's seat perspective) of the headlights dial.

Now I'm working on getting the thing out of the dash so I can check its functions with the multi-meter...in between resting and family stuff...

I'll replace the side kick panel next. Just wire routing down there. All insulation looks great, though!
 

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1996 E320
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THANKS!!!

Got the turn signals working, and learned that the rear "fog lights" are wired to only the left side. Seems silly to me, so I'm going to run my own line to the right side and put a bulb in there.
 
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