Jefri Yahya

Hi all,

Got a weird issue which at first harnessed itself as the usual ABS, ESP Inop message, followed also with Active Light System Inoperative.

Used my Carly Apps which identified the Forward left Wheel Speed Sensor.
Having Replaced that, the ABS ESP message cleared and the driveability back to normal.

However, the Active Light System message would still reappear, and Carly Apps now identifies fault as
"009032 Fault; No CAN message Wheel speed from control unit N47-5 (ESP control Unit)"
and
"005106 Fault; L6/1 (left front Speed sensor) : check installation position of sensor"

So its still faulting the left fornt sensor it seems. But what confuses me is that if the sensor or sensor installation is at fault, why has my
new replacement sensor not given the same problem to the ABS ESP system, and only solely to the active Lights.

Isnt it a shared signal by all the systems anyway, and what other installation requirements could there possibly.
Old unit came out without shims, so replacement unit went in without shims as well.

Thanks for any help guys

Rgds
Jef

Btw would pulling the fuses to the ESP help reset, if there is such a procedure needed.

Maj. Dundee

Those codes must be cleared after installation. Were they?

wannawagon

Also has the car been for a short drive after the items replace?

Jefri Yahya

I did. The ABS EPS stayed off and didnt return. But when I would drive above 40-50km/hr, that Active Light Sys would reappear.
Ive tried 3 times now, and seems to be consistent with the same messages as above.

My procedure for clearance was with the carly apps. It worked fine except for the Active light message.
Which is why I thought my new sensors were duff. But if they were, I would think the ABS would not have been sorted.

Jefri Yahya

Yes. I did test drive after clearing the codes. The messages would not be showing on the display after clearance.
It only reveals itself only after driving 40km/hr above.

wannawagon

Out of curiosity - are you able to drive on grass (or something slippery) and see if the abs is working?

Otherwise it could be a wiring harness issue - I wonder if you can check the resistance at the sensor plug - and then again at the plug going into the abs module - if you look up an old post thread "ML 320 ABS Traction code 5967" maj dundee listed the pinout on it (it was very helpful) - it should show up if the resistance is difference from the sensor only

Jefri Yahya

Removed sensor was reading at 1890 K ohms. Similar to new one. So suspect that the old one would break down in operational heat or vibration.
Anyway I am still obscured to why the failure now is simply limited to the active light system. I thought the curve light on the bumper operated based on steering angle. And I don't see the headlights attached to any actuator to change the beam throw. I see only caps in place on where the push rods are. Also if EPC or the speed signal was at fault, why would the rest of the system not have thrown a code also. The sensor has only two pins, And the receiving socket also only two slots. I would think that the signal is shared being like this physically.

I did notice though that the replacement had slightly different part numbers. Dono of compatibility is an issue. The old ones were
164 540 09 17 and new ones were 164 905 82 00/163. Perhaps a different impedance required? But again strange that the ABS didn't have problems with it.

I also noted that on shutdown, the message was not latched. Meaning after a shutdown, engine restarting would not show the message prompt. If the Carly apps was hooked up for diagnostics, it would however reveal that the Active light sys did latch the fault. I'm beginning to think that the Carly apps can't quite clear the message properly. But then again, it worked fine before when I had to replace the right forward sensor some time back. (Unless the active light system only looks at the left forward sensor)
Oh the agony of my wondering mind😭

Jefri Yahya

Guys. Any idea what this is for? 🤣

Jefri Yahya

Accessible with triple clicking of the R button when ignition is on

Maj. Dundee

I'm almost positive you installed the wrong sensor. Post your full vin #.

Maj. Dundee

I'm almost positive you installed the wrong sensor. Please post your full vin #.

Did you order that number or did the dealer give you that number according to your vin #?

Jefri Yahya

Ordered it thru Pelican. Didn't actually take note of part number then. Only selected it as per menu for my car, & ordered all 4. I also just measured the new sensor lastnight. It's reading at 1385 ohms.( Or would that be Kohms I unsure now)

Historically had right front sensor identified as faulty causing ABS issues. Replaced that one only then. This was about a year ago.

Then when this recent issue happened, I replaced left with remaining spare. So in fact, the fronts now have similar part numbers fitted.

So I only noticed part number variance when this active light issue appeared

Jefri Yahya

My VIN btw. Is WDC164175-2A-175003.

Tasks I've done so far which are probably unrelated to actual problem. LOL
1/checked all tyre pressures. Made all to read 38 psi.
2/recheck installation and cable routing and for physical damage upstream, and measure sensor impedance. (Found to be 1380k ohms)
3/check wheel bearing for play
4/check cleanliness of phonic tooth and sensor bore area ( was found exceptional clean)
5/reseat the ambient light modules on the windscreen. clean windscreen (was getting rather desperate)

Jefri Yahya

The new replacement used

Jefri Yahya

Original top, new bottom PICT

Maj. Dundee

According to your vin# these are the part numbers for both wheel speed sensors. Also included is a copy of your DATA Card.

Jefri Yahya

That's superb info Maj. Wished I had that IPC.
So looks like no mention of the part numbers of what I fitted as replacement indeed.
I will hence need to source same part numbers then. Makes sense as I only had this problem after fitting these new ones.

Thanks very very much indeed. I am truly in awe by your knowledge and willingness to help those such as myself in lowly little Brunei.

I'm guessing what I have is actually rated for w163.

Thanks so very much again Maj.

Jefri Yahya

Btw Maj, if you don't mind, could I see what I should get for the rears. I have bought that also with them fronts and noticed the 163 in the part number also. Looks like I'll need to order those too as my correct spares.

Jefri Yahya

And now I'm confused again.
A164 540 09 17 is what I found originally fitted. As per diagram, are A164 540 16 17, and
A164 541 00 40 and A164 421 07 94 also compatible. Incase I'm misreading the diagram.

I also found Ecstuning supplying that same
A164 905 82 00. Is it perhaps because US models don't use that Active Light system? And hence won't have this issue like me.

Maj. Dundee

The part numbers I supplied you with are a result of M/B Electronic Parts Catalogue (EPC) according to your vin #. Look at the top of the page and you will see your vin#.

If the part number starts with 164, then it can only apply to W164 and not W163.

Look at the highlighted part #164 440 83 39. Any number below that has been replaced and still reverts to 164 440 83 39 at the bottom of the page. So they are not compatible because they were all replaced.

Ianmway

I know it was a long time ago but did you get to the bottom of the Active light error as I have that same problem, ABS front left code and the active light error?

Thanks

wannawagon

Have you changed the wheel speed sensor?

often find that the ring on the hub gets corroded so will rotate the wheel with a flat screwdriver down the sensor hole to scrape gently any corrosion and scale off the sensor ring.

Ianmway

Thanks WannaWagon.

Ordered the sensor yesterday, going to fit it Saturday, I'll have a look at the ring to make sure it's in good condition and remove any corrosion. I changed the rear sensors a few years back, I'm aware that every thing needs to be fitted just so and any corrosion rubbed down, else the sensors don't sit correctly.

From the original post it appears that changing the sensor didn't resolve the active light error, was wondering what the final resolution was?

I suspect the active light error is caused by the wheel speed sensor as the errors appeared within a couple of days of each other and the ABS warning was intermittent for a few days (now permanent).

Not so sure the problem in the original post was the incorrect part number as the sensor I've purchased (BREMI 50669) has the OEM part numbers A1644405141 A1644405541, A1644408339, A1645400917, A1645401617 and A1649058200.

We'll see Saturday.

Thanks

wannawagon

in all honesty I don’t think the active light is actually fitted to Australian cars so it’s not something I can help with

all I can say is that the abs/asc errors are hard to clear and often need a drive and then another attempt. Even then they are a PITA

in any case you obviously have a wheel speed sensor issue so hopefully you fix the abs error with that (and hopefully the active light with it too)

out of curiosity- what is active light-just incase I know it as something else.

Ianmway

Active light is a bit confusing,

I think on my car (2005 ML W164 500) it's where the head lights move slightly left or right when cornering to illuminate the bend better (even checked the car's user manual, but it didn't have anything other than about error messages). The active light error resets it's self when the car is restarted but comes back on when you reach 40 MPH-ish, which fits with some other post I've read. My care also illuminates the corresponding fog light when cornering, this is still working fine.

I've got the Icarsoft MBII so I'm able to clear the codes and carry out some diagnostics.

Lets see what Saturday brings, I'll post up the result.

Thanks again.