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Hey guys I’ve been browsing this forum for a while now along with doing tons of research for the past 3 months about the no audio issue. I’ve read that the amplifier is usually the cause. I took it to the stealership to eliminate guessing and just throwing parts at it. They told me that it’s most likely the amp. I’ve put in a used one with same part number. Idk if the amp has to be coded to work but they want to charge me $200 extra to code it but with no guarantee that it’ll work. Plus have to wait 2 weeks for a disc from Germany for coding? ( It’s what the SA said, not me lol)
Fault codes are the following
-d018 Ring break Pos. 1
-d019 Ring break Pos 2
-dtc9472 Ch4 loudspeaker open
I’ve ordered the fiber optic loop to try to eliminate the components but would also like to know the MOST configuration for this model to maybe speed up the process. MY is 2010
the speaker open fault could be checked with an ohm meter, disconnect that speaker and measure the resistance across its terminals, it should be a very low value (do note, speaker impedance, such as 4 ohm or 8 ohm, is an AC thing, and multimeters only can read DC resistance, which quite likely will be lower so don't sweat the actual number, just that its a very low value in the single digits).
the speaker open fault could be checked with an ohm meter, disconnect that speaker and measure the resistance across its terminals, it should be a very low value (do note, speaker impedance, such as 4 ohm or 8 ohm, is an AC thing, and multimeters only can read DC resistance, which quite likely will be lower so don't sweat the actual number, just that its a very low value in the single digits).
I actually just did that with a buddy. All were around 3.1-3.4 ohms idk if that’s a solid range but I would think they should be around 4.
I actually just did that with a buddy. All were around 3.1-3.4 ohms idk if that’s a solid range but I would think they should be around 4.
what I just said about audio (ac) impedance vs dc resistance. dc resistance is always lower than the impedance because the speaker is an inductor, eg, a coil.
if you can share your VIN, I can look up your datacard, and pull the wiring diagrams for that version. i'm looking at the ones for my 212.288 (2016 E350 4matic wagon) which has the HK Logic7 premium sound (data code 810) and NGT 5.1 COMAND (code 531 after 2015-03)
what I just said about audio (ac) impedance vs dc resistance. dc resistance is always lower than the impedance because the speaker is an inductor, eg, a coil.
if you can share your VIN, I can look up your datacard, and pull the wiring diagrams for that version. i'm looking at the ones for my 212.288 (2016 E350 4matic wagon) which has the HK Logic7 premium sound (data code 810) and NGT 5.1 COMAND (code 531 after 2015-03)
k, lets see... for reference, here's your datacard
Code:
Engine number ... 272980 31 537671 Front axle 1 ....
Sales des. ...... E 350 Front axle 2 ....
Order number .... 0 0 715 74904 Rear axle 1 .....
Production order Rear axle 2 .....
Transmission .... 722906 02 709760 Cab .............
Vehicle title no. Platform ........
Power take-off .. VIN ............. WDDHF5GB2AA225849
Front tire 1 .... Trailer hitch ...
Front tire 2 .... Steering ........
Rear tire 1 ..... Equipment ....... 101A
Rear tire 2 ..... Paint/code 1 .... 040U
Order number 1 .. Paint/code 2 ....
Rims ............ Paint/code 3 ....
Lamps ........... Paint/code 4 ....
Windshield wipers Paint/code 5 ....
Order number 2 .. Door lock .......
Speed. corr. .... Steering lock ...
Source .......... E Transmission lock
Tank lock .......
Retarder ........
SA code:
040U BLACK
050 AEJ 19/2
100A IMITATION LEATHER
101A IMITATION LEATHER - BLACK/ANTHRACITE
108 CONTROL CODE MARKETING
182 CONVERTER WITH DEV. CHARACTERISTIC
1U2 SNOW GRID
212B OP. INSTRUCT. AND MAINT. BOOKLET-ENGL. FOR USA/CAN
218 REAR-VIEW CAMERA
230 PARKING GUIDANCE
232 GARAGE DOOR OPENER WITH 284 - 390 MHZ FREQUENCY
236 ADAPTIVE REAR INTERIOR LIGHT
249 INTERIOR AND EXTERIOR MIRROR,AUTOMATICALLY DIMMING
264 LICENSE PLATE ATTACHMENT AMERICA
265 LINES-NO.PLATE DISCONTINUED
275 MEMORY PACKAGE (DRIVER SEAT, STRG. COL., MIRROR)
279 ELECTRONIC GEAR RANGE SELECTION
280 LEATHER STEERING WHEEL AND LEATHER GEAR SHIFT KNOB
284B AIRBAG LABEL - ENGLISH FOR USA
291 PELVIS AIRBAG (PELVISBAG)
294 KNEE AIRBAG
301 ASHTRAY PACKAGE
309 CUP HOLDER
312B HEAD UNIT LANGUAGE - AMERICAN ENGLISH
342B INSTRUMENT CLUSTER/HU LANGUAGE - AMERICAN
359 TELEAID USA
414 ELECTRIC TILT/SLIDE SUNROOF IN GLASS VERSION
427 AUTOMATIC TRANSMISSION 7-SPEED
428 STEER.WHEEL GEARSHIFT BUTTONS/SHIFT PADDLE PAINTED
43P CONTROL CODE MARKETING
461 INSTRUMENT WITH MILES IND. AND ENGLISH LEGEND
475 TIRE PRESSURE CONTROL
494 U.S. VERSION
512 COMAND APS WITH DVD CHANGER
518 UNIVERSAL COMMUNICATIONS INTERFACE (UCI)
51U BLACK FABRIC ROOF INTERIOR TRIM
536 SIRIUS SATELLITE RADIO COMPLETE SYSTEM
540 ROLLER BLIND, ELECTRIC, FOR REAR WINDOW
543 SUN VISOR WITH ADDITIONAL FUNCTION
551 BASIC ANTITHEFT ALARM SYSTEM (ATA)
580 AIR CONDITIONER
634 DELETION - FIRST AID KIT
636 DELETION - WARNING TRIANGLE
668 PRODUCT PROT. F FREIGHT PACKAG. W TIE-DOWN HOOKS
677 AVANTGARDE/STANDARD SUSPENSION
690 EMERGENCY SPARE TIRE (MINI SPARE)
705L UNITED STATES (USA)
731 TRIM PIECES - WOOD BURRED WALNUT VENEER
763 RADIO REMOTE CONTROL WITH PANIC SWITCH (315 MHZ)
772 AMG STYLING PACKAGE-FRONT SPOILER, SIDE SKIRT
7XXL NORTH AND SOUTH AMERICA
800 AEJ 09/1
810 PREMIUM SOUND SYSTEM
873 SEAT HEATER FOR LEFT AND RIGHT FRONT SEATS
875 HEATED SCREEN WASH SYSTEM
887 SEPARATE TRUNK LID LOCKING
915 FUEL TANK WITH GREATER CAPACITY - VOLUME 2
919 AIRCON COOLING POWER PACKAGE
951 SPORT-PACKAGE USA
954 EQUIPMENT PACKAGE FOR AVANTGARDE VEHICLES
986 DEVIATING VIN WITH MODEL YEAR
989 IDENTIFICATION LABEL UNDER WINDSHIELD
A21 SHIFT BY WIRE
A22 NEW CONVERTER GENERATION
A31 SOFTWARE (INDIVIDUAL)
A36 TORQUE CONVERTER HOUSING AGA
A54 S - VALVE BODY ASSEMBLY WITH VGS 3*
B12 WHEEL REPLACEMENT TOOL
F212 MODEL SERIES 212
FW LIMOUSINE
G906 TRANSMISSION CODE VERSION 06
GA AUTOMATIC TRANSMISSION
HA REAR AXLE
K15 CONTROL CODE FOR SERVICE INTERVAL 15000 KM
K22 SOFTWARE CONTROL F. LOW BEAMS WITHOUT NIGHT DESIGN
K24 STEUERCODE TELEAID SERVICE PROVIDER
L LEFT-HAND STEERING
M272 V6-GASOLINE ENGINE M272
M35 DISPLACEMENT 3.5 LITER
R02 ALL SEASON TYRES
R32 18" LIGHT ALLOY WHEEL 5-SPOKE DESIGN MIXED TIRES
U10 FRONT PASSENGER SEAT WITH WEIGHT SENSING
U12 FLOOR MATS - VELOUR
U71 DVD PLAYER WITH REGIONAL CODE 1, USA
V04 SPEED. + LOADINDEX 97V XL
VL FRONT AXLE HALF, LEFT
VR FRONT AXLE HALF, RIGHT
HOW can we troubleshoot "MOST" (transport fiber) without Xentry or eliminate it as the source of "no audio"???
complex & simple
Best bet is the N40/3 Amp that manages all sound outputs has cooked a fuse (internally or SAM). This module is a beautiful piece of digital electronic with over 40 chips: ridiculously complex and fragile.
There must be a good repair place on the Net that has found a supplier for the custom Audio output chips. Getting your own unit repaired will save you unnecessary SCN costs.
The problem is these amps are built with a couple silly weaknesses, so you can fry a new or repaired unit in heart beat... DO NOT PUSH 'EM HARD and give them a good GND path. look at your GND W6: Trunk near left wheel..!
Take the time to test ALL your speaker resistance to make sure you don't fry a known good unit with a short circuited coil.
Honest Amps are protected for shorts and overheat. May be these are too... there is a big fat chance you're dealing with a simple 5¢ fuse waiting for a bypass surgery.
This module is easy to walk in & out for testing.
✌️
Last edited by CaliBenzDriver; 07-09-2021 at 05:14 PM.
HOW can we troubleshoot "MOST" (transport fiber) without Xentry or eliminate it as the source of "no audio"???
complex & simple
Best bet is the N40/3 Amp that manages all sound outputs has cooked a fuse (internally or SAM). This module is a beautiful piece of digital electronic with over 40 chips: ridiculously complex and fragile.
There must be a good repair place on the Net that has found a supplier for the custom Audio output chips. Getting your own unit repaired will save you unnecessary SCN costs.
The problem is these amps are built with a couple silly weaknesses, so you can fry a new or repaired unit in heart beat... DO NOT PUSH 'EM HARD and give them a good GND path. look at your GND W6: Trunk near left wheel..!
Take the time to test ALL your speaker resistance to make sure you don't fry a known good unit with a short circuited coil.
Honest Amps are protected for shorts and overheat. May be these are too... there is a big fat chance you're dealing with a simple 5¢ fuse waiting for a bypass surgery.
This module is easy to walk in & out for testing.
✌️
The fuse you’re talking about in internal to the amp?
The fuse you’re talking about in internal to the amp?
Correct me if I misunderstood: you've lost 100% audio at once, right? I obviously don't know any of your car history but there is a chance you have blown an internal safety.
To try getting lucky, you can follow the power distribution... either by tracing the PCB or better with the schematic.
Give me some good pics of the PCB on both sides and I'll try to help you by pointing couple spots to check.
Do you have basic skills with a voltmeter and comfortable with live 12Vdc?
Last edited by CaliBenzDriver; 07-09-2021 at 11:23 PM.
Can anyone help me? ! ! ! My w212 e350 has logic7 surround. When I started the audio yesterday, there was no sound. The host function was normal, including the Bluetooth microphone and voice recognition. When connected to the computer, it reported fault code D018, indicating that the most communication failure (the ring structure on position 1 was broken)
MOST is an optical bus that runs from the head unit to the amplifier(s), so you'll probably need to dig out each unit its connected to, and verify its plugged in, and check the optic fiber to be sure its not torn or kinked/cracked.
i'm not sure where the MOST fibers are routed through the chassis. first step, I'd check the ends... behind the head unit, and at the amplifier. I think it also goes to the telematics unit that handles telephone calls and such. specifics depend on model year and such, of course. diagrams are probably in WIS
07-09-2021, 08:39 AM
