It's not a fuse issue so don't waste time checking them. There is only one fuse that powers up the Seat Cont. Module, which we know is already powered up.

You have no alternative but to have the codes read with a scanner. It could be the switch, the module or the motor.

 

Thanks for the quick response! I just bought


last month to diagnose an AC issue with my previous ML ('03, since passed on to my stepson), time to put it to use on the '11. I'll also check under the seat just in case some shoved something under there that yanked a connector. Fortunately the seat is positioned such that there's plenty of legroom in both rows so not an urgent issue. (At some point I'll revisit the '03's AC issue: sometimes it doesn't blow cold air - compressor @ 100% but pressure ~4 bar - most times it does - compressor @ 100% pressure ~12 bar)

 

Mark, there are approx. 25 modules in your veh. and I am sure the scanner you bought will not read all modules.

This is the scanner you need.

 

Hey Major,

I bought the Autel scanner that Amazon calls the 'newer version' in the page you sent me - as I understand it, same unit but requires make-specific modules, first one free with purchase. (I edited the post to remove the walmart link that was automagically added).

The scanner couldn't talk to the passenger seat controller, asked to make sure ignition is on, tester connected, battery charged ... as a sanity check I scanned the driver's seat controller and was able to connect fine.

On a side note, a full scan resulted in just one fault, 5116 - L6/2 (right front speed sensor) : Check installation position of sensor. I'll pop the wheel off and check the cable.

That said there were a number of modules that reported No Checked Fault and drilling down into the module shows one or more Not Checked. I couldn't find reference to in documentation or online, sent Autel support an email, and if I can get to their forum will ask there as well.

 

Whatever scanner you bought, it is obvious that it is not capable of reading seats and restraint system.

 

After the passenger seat controller scan failed, I tried scanning the driver's seat controller and it scanned just fine. Assuming the right and left seat controllers are effectively equivalent, this suggests something is amiss with whatever gets scanned on the passenger side ... would that be the switch (A1648704410)?

As far as the scanner goes, it's the "DIY version of MD802" Autel scanner you linked to: rather than having software for ALL makes, they sell it with NO makes loaded, and with the purchase you get to download one make's software. I own only MB so for the foreseeable future only need the MB module. Saved $110. In the event I get another make, additional modules are $10/pop.

Cheers,

Mark

 

I'm not clear as to what you are trying to say. Please read the Autel instructions on how to scan for codes in all modules which will include both front seats.

Then post the code number/s for the pass. seat which will be, for example 9000. Also post your full vin #.

And yes that is the part # for the right side seat adj. switch.

 

VIN is 4JGBB7CB5BA625429

To clarify: Selecting the "scan" icon, and after it fetches the VIN and identifies the model, it presents "auto scan", "control unit" and "vehicle information". When I select "control unit" I can then scroll through various modules/controllers. When I select the driver seat module, the scanner connects successfully and reports back accordingly, as it does with all the other available modules, except the passenger seat module. When I select the passenger seat module, the scanner 'spins' for a while then apparently times out for lack of a response from the controller and displays:

Tester not communicating with control unit.
1. Make sure the ignition is switched ON.
2. Check the cables between the Tester and the vehicle DLC.
3. Check that the vehicle battery is charged
4. Verify if the system is configured for the Vehicle.

Point being that 1-4 are all good (moot point as the scanner communicates with the driver seat controller and every other module I scanned).

I'll try a full/auto scan (as opposed to a per-module scan) to see what it reports on the passenger seat.

Regarding the switch (A1648704410), is that also (i.e. does it contain) the controller that the scanner is trying to query? If so, and assuming a full/auto scan also fails to connect to the controller, does it make sense to swap that out, or is there some way to test the switch in situ?

Cheers,

Mark

 

[QUOTE=markloch;7648577]

Regarding the switch (A1648704410), is that also (i.e. does it contain) the controller that the scanner is trying to query? If so, and assuming a full/auto scan also fails to connect to the controller, does it make sense to swap that out, or is there some way to test the switch in situ?

/QUOTE]

If it won't communicate with the module, then there is no way of testing the switch.

Remove the seat bolts and gently fold it back and have a look at the module connection.

 

I'll give that a try tomorrow, thanks for the help!

 

This is where I sometimes wish I could stand behind myself and give myself a swift kick. Per my original post I had intended to looking under the seat at the various connections. Never did. Until now. One was unplugged, and once plugged in, all good. That said, the scanner still can't communicate with the passenger seat module ... oh well, all's well that ends well.