steinjr

Any idea what this clicking noise is?

The car is in ignition 2 and the engine is off. The noise stops when the car is off.

VII

That is wierd, maybe air suspension valve?
I would suggest remove relays one by one until noise stops.

​​​​​​

vinflouen

sounds like something is about to short out.
Do you have xentry?

steinjr

I’ll try this. Thanks.

steinjr

I do not. But know someone who can access my vehicle’s diagnostics.

steinjr

Ran a diagnostic check with Xentry. No codes and AirMatic operated properly.

steinjr

Bump... before I take it to the dealership.

VII

Did you try relay and fuses one at a time?

steinjr

I have started to research the fuse and relay locations and the car has 4 different areas.

Should I assume if the issue is in the engine bay the fuse box in the engine bay is the best place to start?

VII

Yes I would start there.

steinjr

Thanks for the help.

Engine bay fuses and relays pulled. Sound did not stop.

I’ll try the other locations.

VII

Hmmm, would try the trunk next.
​​​​​​

steinjr

I’ll be in the trunk next changing out the main battery.

Could a bad battery cause this clicking sound?

VII

Ahh it could, there are a few things that are primed for start at position two.
If the battery needs replacement start there.
A couple of clicks is normal as fuel pump and other peripherals are switched to ready the start but the continuous clicking you are getting is not normal, a low voltage condition might be making something switch on and off.

Nice Ride

You ran over the Energizer Bunny, must be wedged in the grill. The sound will keep going, and going....
Lol...
Possibly the air compressor driver side front?

steinjr

Relay found in trunk fuse box.

According to my research this is S - Relay circuit 15 car interior. Not sure how that would cause a clicking noise in the front grill area.

I did swap out with another relay and the noise persists.

Mercedes does provide a diagram sheet for all the fuse boxes, but this relay wasn’t labeled.

Thoughts?

steinjr

Another bump

VII

That would be interior systems power, not very helpful as it controls too many things.
What about fuses?

steinjr

I stopped with that relay. I did take to continue to see if any of the fuses or other relays would make the sound stop. I will continue to pull the fuses and relays in the truck. Appreciate the info.

steinjr

I gave up troubleshooting and took the car to the dealership on a Saturday. They were kind enough to take a quick look. They did hear the clicking noise and stated it was not normal. They thought it might be a pump and asked me to set up an appointment so I could get a loaner vehicle.

jcat

does your car have the front camera? Sounds like a stripped/broken motor.

steinjr

Yes, it does have the front camera and it works fine. I use it daily to line up in the garage.

Is there a reason the front camera would try to open in ignition position 2?

jcat

that I don't know, I was thinking maybe it's trying to baseline the camera position. I don't know what else would be in that area. It definitely seems like something behind the grille or attached to the bumper bar below the grille.

Is it more on one side than the other? I never knew there was a blower in the headlights, but it could be that (part 12 in the diagram, 13 is a repair kit for it of some kind)

steinjr

I was finally was able to get an appointment with dealership and the noise has stopped.

The dealership has no idea what would be causing the noise or why it has now stopped. All they could tell me is that if a part has gone bad there would be a code and there is no code.

steinjr

.