OK, 2006 W221 'S' class lwb where the hell is the fuse box ?

[LPGJOE]

Nothing under bonnet, one each side of dash, no relays in them, trying to find where the relay is for the air suspension pump, and witch one it is, a diagram would be handy, cant find any panel's in boot, have the owners book that came with car , but that says its under the bonnet !! and its not.

 

[mioba]

Usually in the bower top corner near the firewall.

 

[EmilysDad]

Usually in the bower top corner near the firewall.

bulkhead ....

 

[LPGJOE]

Usually in the bower top corner near the firewall.

Found the one's in each side of the dash & also the one behind the rear armrest but nothing under the bonnet, been on youtube ect and they all say under the bonnet ! but its not there, will put photo of engine bay tomorrow, Drivers side main Ecu, passenger side ,Battery.

 

[LPGJOE]

Usually in the bower top corner near the firewall.

Not there, Drivers side main Ecu, Passenger side Battery, have i got some strange merc ? some things seem to be in differant places , or do merc do it to mess you about

 

[LPGJOE]

Photos of engine bay ! No fuse box to be seen , looking for the one that has the air compressor relay

 

[barry jones]

It's under here....

 

[Blobcat]

View attachment 62033 View attachment 62034 View attachment 62035 View attachment 62035 View attachment 62034 View attachment 62033

Photos of engine bay ! No fuse box to be seen , looking for the one that has the air compressor relay

Small point but please clean out the leaves and detritus from the bottom of the windscreen. Let it build up and your scuttle drains will block. This then means rain water flows though your heater into your foot wells causing a world of electrical pain.

 

[LPGJOE]

It's under here.... View attachment 62036

Thanks what a stupid place to put it, would have thought it would have been more accessible than that , Merc seem to try their hardest to make things difficult.

 

[LPGJOE]

Small point but please clean out the leaves and detritus from the bottom of the windscreen. Let it build up and your scuttle drains will block. This then means rain water flows though your heater into your foot wells causing a world of electrical pain.

They get cleaned quite regular, Its just bonnet , boot windows etc have been open all day (Heat) and have been replacing air & fuel filter + i live out in the country surrounded by trees and fields, may be able to make it out from photo, becomes a pain in the arse when the leaves start to fall

 

[Botus]

they have 4 normal fuse boxes and on the battery side some fusable links for other stuff

• the one the guys have shown you... the front SAM usually has a cover with 4 torx bolts holding on a matt back plastic cover about 7 x 11 inches. On the tractor engine'd ones it seems they put the engine ecu on the top to hide it
• the ends of the dash on both sides have fuses
• the last is behind the rear arm rest
• in the boot its basically an ECU holder, with, depending upon equipment 9 other boxes of tricks in the inner wings or behind the fake back of the boot where early ones will have a second 25kg battery hidden away

the Fuse you want is in the front SAM, a giant 40 amp orange thing
F56 40 AirMatic Compressor Pump A9/1

in the same place is
A Air Pump Relay the fuse and this relay are recco to be changed when you change the air pump

Prefuse Box in the Engine Bay – F32/3
F2 400 Alternator
F3 150 Electrohydraulic Power Steering A91/1 or glow time out put stage N14/3
F4 Nofuse Interior prefuse box F32/4
F5 100 AAC with integrated control additional fan motor M4/7
F6 150 Front SAM control unit with fuse. Relay module N10/1
F7 40 ESP Control Unit, Brake System
F8 25 ESP Control Unit, Brake System N30/6
F9 30 Front SAM control unit N10/1
F10 – Not used

Relays in the Engine Bay – Front SAM Control Unit – N10/1
A Air Pump Relay
B Air Suspension Compressor Relay
C Engine terminal 87
D Relay 15 -terminal
R Terminal 87 relay
F Horn Relay
G 15R Relay
H Starter – Circuit 50 relay
J Starter – Circuit 15
K Wiper park heater relay

Fuses – Box in the Engine Bay – Front SAM Control Unit – N10/1
F20 10 Control Unit N3/9 or N3/10
F21 20 Circuit 87 – Fuel Pump Relay
F22 15 Connector sleeve
F23 20 Rear SAM Control Unit Fuse Box
F24 25 CDI Control Unit N3/9
F25 7.5 Instrument Cluster – Dashboard
F26 10 Left headlight – lamp unit
F27 10 Right Headlight – lamp unit
F28 7.5 EGS Unit Transmission control unit.
F29 5 Rear fuse box and relay module Rear SAM N10/2
F30 7.5 Fusel System Control Unit , Engine Control Unit N3/9 N3/10 N118
F31 5 Refrigerant Compressor
F32 15 Transmission oil pump control unit N89
F33 5 ESP Control Unit, Battery Management, Power Electronics
F34 5 Braking System N30/6
F35 5 Electric parking brake -A13
F36 10 Data link connector – 16 PinX11/4
F37 7.5 EIS Control Unit N73
F38 7.5 CGW Central Gateway control unit, Audio, Sound
F39 7.5 Instrument cluster
F40 7.5 Upper control panel N72/1
F41 30 Wiper motor M6/7
F42 30 Master wiper motor M6/6
F43 15 Front cigar lighter with ashtray illumination
F44 – Unused
F45 5 Power electronics pump M13/8
F46 15 ABC Control Unit N51/2 or AIRMATIC N51
F47 15 Steering column adjustment motor up or down
F48 15 Steering column adjustment motor in / out
F49 10 Steering column N80
F50 15 AAC Unit N22/1
F51 5 COMAND Display
F52A 15 Horns
F52B 15 Horns
F53 – Unused
F54 40 Air Recirculation AC
F55 60 Electric Air Pump
F56 40 AirMatic Compressor Pump A9/1
F57 30 Wiper Heater R2/10
F60 5 Power Steering A91-1
F61 7.5 SRS Airbag Restraint System N2/7
F62 5 Night View Assist N101
F63 15 Fuel Filter Sensor B76/1
F64 10 NECK PRO Head Restraint Solenoids Y24/12 – Driver, Y24/13-Passenger
F65 15 Outlet in glove box
F66 7.5 DTR Unit A89

Interior Fuses Right side of the dash F1/6
F70 40 Door Control Unit – Right N69/2
F71 15 Keyless Go Control Unit N69/5
F72 7.5 Pyrotechnical Separator K88
F73 5 Emergency Call System Control Unit
F74 30 TLC Control Unit
F75 10 Battery Management
F76 15 Vacuum pump relay
F77 50 Sound Amplifier A2/13
F78 25 AdBlue Relay/ Additional Fan/ Charge Air Cooler Circulation Pump
F79 7.5 Alarm H3/1
F80 40 Door Control Unit – Left Door N69/1
F81 30 Rear control unit CL model Rear door control unit S Class
F82 30 Rear door control unit
F83 30 Intellignet Servo Unit. Direct Select
F84 20 Sound Proceeding Unit A2/69
F85 10 Illumination for Door Sills
F86 – Not used
F87 – Not used
F88 – Not used
F89 – Not used
F90 20 Heater unit
F91 5 Front SAM unit

Fuses Driver side, Left side of dash F1/7
F92 40 Left front seat N32/1
F93 7.5 Weight sensing system N2/13
F94 5 Camera
F95 – Spare
F96 5 TPM RDK Unit N88
F97 7.5 DVD Player
F98 – Spare
F99 7.5 COMAND
F100 5 Media Interface N125/1
F101 10 Rear Displays Left A40/5 RightA40/6
F102 40 Right front seat N32/2
F103 7.5 ESP Electronic Stability Program
F104 40 Audio Radio Tuner
F105 – Not used
F106 5 Navigation / TV Tuner/ Toll Collection
F107 5 HD Tuner N87/8, Audio Broadcasting N87/3, SDAR Sirus Unit
F108 5 Rear A/C N22/4
F109 15 Rear Air conditioner blower motor N29/2
F110 7.5 Rear Back rest control Unit N32/20 N32/21
F111 5 RCP Control Unit N72/2
F112 5 Fuse box, Front SAM
F113 5 DC Converter
F114 – Not used

Prefuse Box Hidden behind the dash, passenger side. P32/4
F3 150 Rear SAM control unit N10/2
F4 150 Heated Windshield, DC Converter, ECO start/stop function
F5 40 Vacum Pump
F6 80 Right dashboard fuse box F1/6
F7 150 Heater booster R22/3
F8 80 Front SAM module N10/1
F9 80 Left dashboard fuse box F1/7
F10 150 Rear SAM N10/2

Battery Fuse – Backup – F38
F38 Fuse 38 is a 5-ampere fuse, for the additional auxiliary battery G1/7, EZS control unit N73, and Front SAM control unit.

Fuses in the boot – Rear Sam Control Unit – N10/2
F115 50 Rear window heater
F116 10 Power electronic pump
F117 15 Rear cigar outlet
F117 30 Fuel Pump
F118 15 AC Compressor/ Power electronics pump/ fuel pump
F119 7.5 Front central unit A40/9
F120 – Not used
F121 10 Audio radio tuner
F122 7.5 COMAND A40/3
F123 40 Emergency tension retractor – Right front A76/1
F124 40 Emergency tensioner retractor – left front A76
F125 5 Voice Control VCS N41/3
F126 25 Overhead control panel N70
F127 30 Pneumatic pump seat control M40/1, Seat pneumatic pump M40, Lumbar pump M25/1
F128 25 Fuel pump N118
F129 25 Universal portable cell phone control unit UPCI N123/1
F130 30 Parking brake – Electric A13
F131 7.5 Rear window antenna amplifier A2/12
F133 5 Rear camera B84/3
F134 15 Rear trunk outlet socket X58/12
F135 7.5 Radar sensor / parktronic PTS N62
F136 7.5 AdBlue N118/5
F137 7.5 Rear Camera B84/3
F138 5 TV/ tuner / emergency call / navigator
F139 15 Rear back rest refrigerator A39/1
F140 15 120 outlet socket, rear cigarete lighter outlet
F141 5 Rear camera N66/2
F142 7.5 Video and radar sensor N62
F143 25 Rear seat N25/6
F144 25 Rear seat N25/6
F145 20 Rear trailer hitch socket – 13 pin type – X58
F146 25 Trailer N28/1
F147 – Spare
F148 25 Panoramic sliding sunroof
F149 25 Panoramic sliding sunroof A98
F150 7.5 TV Tuner
F151 20 Trailer
F152 25 AC Converter from DC N24/3
F153 – Not used

Relays in boot – Rear Sam Control Unit – N10/2
M Circuit 15 N10/2
N Terminal 15R
O Power outlet relay
R Cigar lighter relay
S Fuel Pump

 

[LPGJOE]

they have 4 normal fuse boxes and on the battery side some fusable links for other stuff

• the one the guys have shown you... the front SAM usually has a cover with 4 torx bolts holding on a matt back plastic cover about 7 x 11 inches. On the tractor engine'd ones it seems they put the engine ecu on the top to hide it
• the ends of the dash on both sides have fuses
• the last is behind the rear arm rest
• in the boot its basically an ECU holder, with, depending upon equipment 9 other boxes of tricks in the inner wings or behind the fake back of the boot where early ones will have a second 25kg battery hidden away

the Fuse you want is in the front SAM, a giant 40 amp orange thing
F56 40 AirMatic Compressor Pump A9/1

in the same place is
A Air Pump Relay the fuse and this relay are recco to be changed when you change the air pump

Prefuse Box in the Engine Bay – F32/3
F2 400 Alternator
F3 150 Electrohydraulic Power Steering A91/1 or glow time out put stage N14/3
F4 Nofuse Interior prefuse box F32/4
F5 100 AAC with integrated control additional fan motor M4/7
F6 150 Front SAM control unit with fuse. Relay module N10/1
F7 40 ESP Control Unit, Brake System
F8 25 ESP Control Unit, Brake System N30/6
F9 30 Front SAM control unit N10/1
F10 – Not used

Relays in the Engine Bay – Front SAM Control Unit – N10/1
A Air Pump Relay
B Air Suspension Compressor Relay
C Engine terminal 87
D Relay 15 -terminal
R Terminal 87 relay
F Horn Relay
G 15R Relay
H Starter – Circuit 50 relay
J Starter – Circuit 15
K Wiper park heater relay

Fuses – Box in the Engine Bay – Front SAM Control Unit – N10/1
F20 10 Control Unit N3/9 or N3/10
F21 20 Circuit 87 – Fuel Pump Relay
F22 15 Connector sleeve
F23 20 Rear SAM Control Unit Fuse Box
F24 25 CDI Control Unit N3/9
F25 7.5 Instrument Cluster – Dashboard
F26 10 Left headlight – lamp unit
F27 10 Right Headlight – lamp unit
F28 7.5 EGS Unit Transmission control unit.
F29 5 Rear fuse box and relay module Rear SAM N10/2
F30 7.5 Fusel System Control Unit , Engine Control Unit N3/9 N3/10 N118
F31 5 Refrigerant Compressor
F32 15 Transmission oil pump control unit N89
F33 5 ESP Control Unit, Battery Management, Power Electronics
F34 5 Braking System N30/6
F35 5 Electric parking brake -A13
F36 10 Data link connector – 16 PinX11/4
F37 7.5 EIS Control Unit N73
F38 7.5 CGW Central Gateway control unit, Audio, Sound
F39 7.5 Instrument cluster
F40 7.5 Upper control panel N72/1
F41 30 Wiper motor M6/7
F42 30 Master wiper motor M6/6
F43 15 Front cigar lighter with ashtray illumination
F44 – Unused
F45 5 Power electronics pump M13/8
F46 15 ABC Control Unit N51/2 or AIRMATIC N51
F47 15 Steering column adjustment motor up or down
F48 15 Steering column adjustment motor in / out
F49 10 Steering column N80
F50 15 AAC Unit N22/1
F51 5 COMAND Display
F52A 15 Horns
F52B 15 Horns
F53 – Unused
F54 40 Air Recirculation AC
F55 60 Electric Air Pump
F56 40 AirMatic Compressor Pump A9/1
F57 30 Wiper Heater R2/10
F60 5 Power Steering A91-1
F61 7.5 SRS Airbag Restraint System N2/7
F62 5 Night View Assist N101
F63 15 Fuel Filter Sensor B76/1
F64 10 NECK PRO Head Restraint Solenoids Y24/12 – Driver, Y24/13-Passenger
F65 15 Outlet in glove box
F66 7.5 DTR Unit A89

Interior Fuses Right side of the dash F1/6
F70 40 Door Control Unit – Right N69/2
F71 15 Keyless Go Control Unit N69/5
F72 7.5 Pyrotechnical Separator K88
F73 5 Emergency Call System Control Unit
F74 30 TLC Control Unit
F75 10 Battery Management
F76 15 Vacuum pump relay
F77 50 Sound Amplifier A2/13
F78 25 AdBlue Relay/ Additional Fan/ Charge Air Cooler Circulation Pump
F79 7.5 Alarm H3/1
F80 40 Door Control Unit – Left Door N69/1
F81 30 Rear control unit CL model Rear door control unit S Class
F82 30 Rear door control unit
F83 30 Intellignet Servo Unit. Direct Select
F84 20 Sound Proceeding Unit A2/69
F85 10 Illumination for Door Sills
F86 – Not used
F87 – Not used
F88 – Not used
F89 – Not used
F90 20 Heater unit
F91 5 Front SAM unit

Fuses Driver side, Left side of dash F1/7
F92 40 Left front seat N32/1
F93 7.5 Weight sensing system N2/13
F94 5 Camera
F95 – Spare
F96 5 TPM RDK Unit N88
F97 7.5 DVD Player
F98 – Spare
F99 7.5 COMAND
F100 5 Media Interface N125/1
F101 10 Rear Displays Left A40/5 RightA40/6
F102 40 Right front seat N32/2
F103 7.5 ESP Electronic Stability Program
F104 40 Audio Radio Tuner
F105 – Not used
F106 5 Navigation / TV Tuner/ Toll Collection
F107 5 HD Tuner N87/8, Audio Broadcasting N87/3, SDAR Sirus Unit
F108 5 Rear A/C N22/4
F109 15 Rear Air conditioner blower motor N29/2
F110 7.5 Rear Back rest control Unit N32/20 N32/21
F111 5 RCP Control Unit N72/2
F112 5 Fuse box, Front SAM
F113 5 DC Converter
F114 – Not used

Prefuse Box Hidden behind the dash, passenger side. P32/4
F3 150 Rear SAM control unit N10/2
F4 150 Heated Windshield, DC Converter, ECO start/stop function
F5 40 Vacum Pump
F6 80 Right dashboard fuse box F1/6
F7 150 Heater booster R22/3
F8 80 Front SAM module N10/1
F9 80 Left dashboard fuse box F1/7
F10 150 Rear SAM N10/2

Battery Fuse – Backup – F38
F38 Fuse 38 is a 5-ampere fuse, for the additional auxiliary battery G1/7, EZS control unit N73, and Front SAM control unit.

Fuses in the boot – Rear Sam Control Unit – N10/2
F115 50 Rear window heater
F116 10 Power electronic pump
F117 15 Rear cigar outlet
F117 30 Fuel Pump
F118 15 AC Compressor/ Power electronics pump/ fuel pump
F119 7.5 Front central unit A40/9
F120 – Not used
F121 10 Audio radio tuner
F122 7.5 COMAND A40/3
F123 40 Emergency tension retractor – Right front A76/1
F124 40 Emergency tensioner retractor – left front A76
F125 5 Voice Control VCS N41/3
F126 25 Overhead control panel N70
F127 30 Pneumatic pump seat control M40/1, Seat pneumatic pump M40, Lumbar pump M25/1
F128 25 Fuel pump N118
F129 25 Universal portable cell phone control unit UPCI N123/1
F130 30 Parking brake – Electric A13
F131 7.5 Rear window antenna amplifier A2/12
F133 5 Rear camera B84/3
F134 15 Rear trunk outlet socket X58/12
F135 7.5 Radar sensor / parktronic PTS N62
F136 7.5 AdBlue N118/5
F137 7.5 Rear Camera B84/3
F138 5 TV/ tuner / emergency call / navigator
F139 15 Rear back rest refrigerator A39/1
F140 15 120 outlet socket, rear cigarete lighter outlet
F141 5 Rear camera N66/2
F142 7.5 Video and radar sensor N62
F143 25 Rear seat N25/6
F144 25 Rear seat N25/6
F145 20 Rear trailer hitch socket – 13 pin type – X58
F146 25 Trailer N28/1
F147 – Spare
F148 25 Panoramic sliding sunroof
F149 25 Panoramic sliding sunroof A98
F150 7.5 TV Tuner
F151 20 Trailer
F152 25 AC Converter from DC N24/3
F153 – Not used

Relays in boot – Rear Sam Control Unit – N10/2
M Circuit 15 N10/2
N Terminal 15R
O Power outlet relay
R Cigar lighter relay
S Fuel Pump

Thanks that was very informative and much appreciated . So has the SAM unit shown in photo to be removed to access the fuse box, and is the SAM unit missing a plastic cover ?

 

[peterws1957]

Small point but please clean out the leaves and detritus from the bottom of the windscreen. Let it build up and your scuttle drains will block. This then means rain water flows though your heater into your foot wells causing a world of electrical pain.

The debris doesn't even have to build up, one leaf can block a scuttle drain. I could be mistaken, but the drain on the bulkhead below the scuttle one looks full of debris as well. A right pain in the proverbial these drains are.

 

[Botus]

Thanks that was very informative and much appreciated . So has the SAM unit shown in photo to be removed to access the fuse box, and is the SAM unit missing a plastic cover ?

RHD vehicles - On the passenger side there's a bit (small 1" lever on inside face), you depress on the bonnet hinge it allows the bonnet to open a few more degrees. Having done that, you can walk round the drivers side and do the same and now get a fair bit more opening. Its helpful when playing with stuff at the back of the engine bay. Like the crank sensor. Closing the bonnet when done is normal, but the levers click as they pop back to normal.

Can't see clearly....

It looks like the engine ECU is clipped on top of the conventional cover. Two ideas

1) there are large holes exactly where the front fastenings are (along the side). And the rears nearest the wiper area are probably after the back of the ECU. Maybe the idea is you leave it attached to the lid. Undo the lid and wiggle it all off together ???

2) Unclip /release the ECU and fold carefully away to get clearance that might be the normal SAM lid. The four fastenings need to be undone. you'll need a UJ or ball end drivers to do it easily. Just thinking might be an allen key 3 or 4mm

The fastenings are captive to the lid they don't come off the lid. Making it a nuisance as its hard to know when undone enough and as you wiggle one usually catches a thread. Should be great fun if the ECU stays with it and those mega thick wires give u a fight.

 

[LPGJOE]

The debris doesn't even have to build up, one leaf can block a scuttle drain. I could be mistaken, but the drain on the bulkhead below the scuttle one looks full of debris as well. A right pain in the proverbial these drains are.

Dont worry it gets blown out with an air line,

 

[Botus]

drivers side SAM so these are back to front

brass bits are the rear fastening threads

oh and on the top right is the lever to get the bonnet to move more...

 

[LPGJOE]

drivers side SAM so these are back to front

brass bits are the rear fastening threads

oh and on the top right is the lever to get the bonnet to move more...

Thanks But mine is not like this my battery is here against the bulkhead, been told its on drivers side where the SAM unit is.

 

[Botus]

Thanks But mine is not like this my battery is here against the bulkhead, been told its on drivers side where the SAM unit is.

you are getting old. The pictures above are from left hand drive cars.... hence my comment to remember they are back to front. the big clue is in the name Drivers side SAM. It will look like that but on your side of the car

everything I wrote or the pictures I have posted are helpful…. but you look for them on your side



below curtesy of powerpoints flip horizonal feature, the SAM is now magically where it should be

 

[barry jones]

Thanks what a stupid place to put it, would have thought it would have been more accessible than that , Merc seem to try their hardest to make things difficult.

Probably true, but the S Class is their flagship model and priced from £55,000 new, they obviously don't want just anyone playing about with the electrical systems... which is fine when new, but when a car is 5, 10, 15 years old, it makes things very awkward!

 

[LPGJOE]

View attachment 62137

Thanks Is this what i will find Below the Driver side SAM unit ?