Hello. I have been having some trouble with my Mercedes w221 S63L 2009 facelift
Warning lights on the dashboard: airbag faults, drive to workshop without changing gears and an sos phone fault. Car starts and runs.. But no turn signals or entertainment system.

i checked the fuses in the middle rear Seat and found out that atleast 3 or 4 fuses are not getting any power. The fuses are GOOD. photo will be attached. Any help would be appreciated. Thank you so much.

 

After i replaced the negative terminal all these fault codes came up. Could it be that aswell considering the battery sensor is different?

 

to make it awkward the facelift from 2009 moved them about - https://car-box.info/mercedes-benz/s...2009-2013.html - the RED text is the three you said are not powered

according to this you aren't supposed to have a 40 amp fuse in there at position 117 (only only 15 Amp) and again not 40 Amp in position 130 (only 30 Amp)
so it suggests its been having issues and been bodged about - a 40 Amp fuse in a 15 amp circuit could well cause damage to the wiring if something shorts the circuit.... its VERY unusual other than cigarette lighter power outlets you ever pop ANY fuse

I'd put the correct fuses in then look for trapped wires.... there is a ridiculous black H frame bolt in section in the boot - when fitted badly can trap the loom to this fuse board... you find it after taking ALL the boot trim out - this H SRB has the Rear SAM module clipped to it and bad connections will cause weird and wonderful issues

if you are starting with strange wrong fuses, animals are us have been at play - so I'd check the front SRB / Front SAM before playing much more

Rear Fuse board

No. Amps Purpose of fuses
115 50 Heated rear window
116 10 Engine 157, 275, 278: Charge air cooler circulation pump Engine 156: Engine Oil Cooler Circulation Pump S 400 Hybrid: Circulation pump 2 power electronics
117 15 Rear cigarette lighter fuse
118 30 Engine 629, 642: Fuel module (fuse for Mercedes W221 / C216 fuel pump) OR 15 S 400 Hybrid : Circulation pump 1 for power electronics OR 15 Engine 642.8, 651 from 1.6.11: Refrigerant compressor with electromagnetic clutch
119 7.5 Front center control panel
120 - Reserve
121 10 Audio tuner module 122 7.5 COMAND module 123 40 W221: Front right reversible seat belt pretensioner
124 40 W221: Front left reversible seat belt pretensioner
125 5 Voice control module (SBS)
126 25 Overhead control panel
127 30 Seat back pump Pneumatic pump for multicontour seat Pneumatic pump for dynamic seat adjustment
128 25 Engine 156, 157, 272, 273, 275, 276, 278, 642: Fuel pump control unit
129 25 UHI (Universal Cell Phone Interface) Module
130 30 Electric parking brake module
131 7.5 Antenna amplifier module above rear window
133 15 Trailer recognition module OR 5 Rear View Camera
134 15 Luggage compartment socket
135 7.5 Radar Sensor Module (SGR) PTS module (PARKTRONIC)
136 7.5 Engine 642.8: AdBlue ® control unit
137 7.5 From 1.9.10: Rear view camera
138 5 Navigation processor (Taiwan, up to 31.8.10) Emergency call system module TV / tuner plug connection (Japan)
139 15 Refrigerated box in the rear seat back
140 15 Cigarette lighter plug with ashtray lighting, rear 115 V socket
141 5 Rear view camera control unit Rear view camera power supply module
142 7.5 PTS module (PARKTRONIC) Radar Sensor Module (SGR) Video sensors and radar sensors module (from 1.9.10)
143 25 Rear seat module
144 25 145 20 AHV trailer coupling, 13-pin
146 25 Trailer recognition system
147 - Reserve
148 25 End sleeve for panoramic sliding sunroof terminal 30
149 25 Panoramic sliding sunroof control module
150 7.5 Combo TV tuner (analog / digital) TV / tuner plug connection (Japan)
151 20 Trailer recognition system
152 25 DC / AC converter

Front (under the bonnet near brake reservoir - with screw on black lid)

No. Amps Purpose of fuses
20 10 Engine 629, 642, 651: CDI control unit Engine 156, 157, 272, 273, 275, 276, 278: ME control unit
21 20 Engine 156, 157, 272, 273, 275, 276, 278: Electr. circuit terminal 87 M1i Engine 629, 642: - CDI systems Fuel pump relay Mercedes S-Class W221 / C216 Engine 651: Metering valve
22 15 Engine 156, 157, 272, 273, 276, 278: Electr. terminal 87 circuit
23 20 Engine 156, 157, 272, 273, 275, 276, 278, 629, 642: Electr. terminal 87 circuit Engine 156, 157, 272, 273, 276, 278: Electr. circuit terminal 87 M2e Engine 275: Cable lug electr. circuit terminal 87 M2i Engine 651: SAM with rear fuse and relay module
24 25 Engine 157, 272, 273, 276, 278: Electr. circuit terminal 87M1e Engine 642: CDI control unit
25 7.5 Instrument cluster
26 10 Front left headlamp
27 10 Front right headlamp
28 7.5 Engine 275: EGS module Automatic gearbox integrated module (VGS)
29 5 Rear SAM control unit with fuse and relay module
30 7.5 Engine 629, 642, 651: CDI system module Engine 156, 157, 272, 273, 275, 276, 278: ME control module Fuel pump module
31 5 S 400 Hybrid: Electric A / C Compressor
32 15 Gearbox auxiliary oil pump control unit
33 5 Since 1.9.10: ESP unit S 400 Hybrid: Battery control unit DC voltage converter control unit Power electronics control unit
34 5 S 400 Hybrid: Brake Energy Regeneration Control Unit
35 5 Electric parking brake control unit 36 10 Diagnostic connector
37 7.5 EZS
38 7.5 Central interface control unit
39 7.5 Instrument cluster
40 7.5 Upper control panel
41 30 Slave wiper Engine
42 30 Main electric Engine of the cleaner
43 15 Front cigarette lighter fuse Mercedes-Benz S-Class W221 / C216
44 - Reserve
45 5 S 400 Hybrid: Circulation pump 1 power electronics
46 15 ABC (Active Body Level Control) AIRMATIC with ADS
47 15 Electric steering column adjustment Engine up and down
48 15 Electric steering column adjustment Engine forwards and backwards
49 10 Steering column electronics
50 15 KLA control unit
51 5 COMAND display SPLITVIEW display system
52a 15 C216 Left and right horn
52b 15 W221, C216: Left and right horn
53 - Stock
54 40 Air recirculation unit for climate system
55 60 Gasoline Engines: Electric Air Pump
56 40 AIRmatic compressor block
57 30 Heated wiper blades
60 5 Electro-hydraulic power steering
61 7.5 passive safety system
62 5 night vision systems
63 15 With engine 629 and engine 642 as of 1.9.08: Fuel filter condensate sensor with heating element
64 10 NECK-PRO headrest electromagnet coil on the backrest of the driver's seat and right front seat
65 15 Valid from 1.6.09: 12 volt plug connection in the glove compartment
66 DTR control module (Distronic)

 

@BOTUS , I'm always amazed by your answers...how did you learn so much about these cars? Are/were you a professional mechanic? You and BenzNinja would be the dream team to start a shop together.

 

thanks for your answer. The problem was the auxilary battery, the negative terminal was not properly connected.

 

nice - simple things that actually fix a visible issue are rare these days - you still want the right fuses in the correct places...

 

if you stay in the mix for long enough you pick some stuff up - there's a definite theme in cars - the evolution to ever more complexity and less reliability - the game, lease it, drive it, scrap it

very wrong for the planet and worse, linked to deliberate societal changes which are exceptional unhealthy - the original matrix movie is the end game, and that screen saver is the same stuff that makes the cars and now people do weird things

keep us busy on this, whilst they get up to mischief