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Assignment Of Rear Fuse And Relay Module - GF54.15-P-1256-30FR

Model 257, 290 

Fig 1: Rear Fuse And Relay Module - Model 257 (Variant 1)
G14549318IMPORTANTCourtesy of MERCEDES-BENZ USA
Slot Fuse Identification Circuit Wire Identification Fused component Fuse rating (A)
400...402 Electrical fuse 400 (K40/5f400) - Electrical fuse 402 (K40/5f402)     Spare  
403 Electrical fuse 403 (K40/5f403) 87 2.5 RDYE Except code 278 (Fully electric front seats) and except code 275 (Memory Package): 
Front passenger seat partially electric seat adjustment switch (S23/1)		 30
404 Electrical fuse 404 (K40/5f404) 87 2.5 RDGN Except code 278 (Fully electric front seats) and except code 275 (Memory Package): 
Driver seat partially electric seat adjustment switch (S22/1)		 30
405 Electrical fuse 405 (K40/5f405) 87 0.5 RD Model 290 except code 224 (Design individual rear seat system) 
USB port in rear passenger compartment at left (X115/3) USB port in rear passenger compartment at right (X115/4)		 :5
        Model 290 with code 224 (Individual rear seat system design): 
Rear cup holder (R5/3)		  
406 Electrical fuse 406 (K40/5f406) 30t 0.5 RDOG With code 380 (Car Telephony Package) and code 899 (Multifunction telephony): Telephone antenna changeover switch (A2/168) 5
407 Electrical fuse 407 (K40/5f407) 30t 2.5 RDWH With code 432 (Left and right dynamic multicontour seat: 
Multicontour seat pneumatic pump (M40)		 30
408 Electrical fuse 408 (K40/5f408) 30t 2.5 RDBU or 2.5 RD With code 811 (Advanced sound system): 
Rear woofer amplifier (N40/14)		 30
        Model 257 with code B63 (Sporty engine sound), except code 810 (Sound system) and except code 811 (Advanced sound system): 
Engine sound control unit (N40/1)		  
409 Electrical fuse 409 (K40/5f409) 30t 1.0 RDBK Model 257 with code U79 (BlueTEC (SCR) diesel exhaust gas cleaning, generation 3): 
AdBlue® control unit (N118/5)		 15
410 Electrical fuse 410 (K40/5f410) 30t 0.5 RDYE With code B01 (48V technology): 
DC/DC converter control unit (N83/1)		 5
411 Electrical fuse 411 (K40/5f411) 30t 2.5 RD Fuel system control unit (N118) 25
412 Electrical fuse 412 (K40/5f412) 30t 0.5 RD Model 257 with code 531 (COMAND APS) and code 830 (Additional parts for China vehicles), model 290 with code 531 (COMAND APS) and except code 498 (Japan version): 
Rear passenger compartment multimedia connection (A90/7)		 7, 5
        Model 257 up to 30.06.2019: 
USB port, rear passenger compartment (X115/2)		  
        Model 290 except code 224 (Design individual rear seat system): 
USB port, rear passenger compartment (X115/2) USB port in rear passenger compartment at left (X115/3) USB port in rear passenger compartment at right (X115/4)		  
        Model 290 with code 224 (Individual rear seat system design): 
USB port in rear passenger compartment at left (X115/3) USB port in rear passenger compartment at right (X115/4)		  
413 Electrical fuse 413 (K40/5f413) 30t 0.5 RDBK With code B01 (48V technology): 
48 V on-board electrical system battery (G1/3)		 5
414 Electrical fuse 414 (K40/5f414) 30t 0.5 RDWH With code 865 (TV tuner): 
TV tuner control unit (N143)		 5
415 Electrical fuse 415 (K40/5f415) 30t 0.5 RDGN With code 233 (DISTRONIC PLUS): 
Mercedes-Benz Intelligent Drive control unit (N62/4)		 5
416 Electrical fuse 416 (K40/5f416) 30t 0.5 RD With code B24 (Remote control for stationary heater): 
Stationary heater radio remote control receiver (A6/1)		 5
417 Electrical fuse 417 (K40/5f417) 30t 0.75 RD With code 891 (Premium ambient lighting): 
Ambiance illumination control unit (N162)		 7, 5
418...423 Electrical fuse 418 (K40/5f418) - Electrical fuse 423 (K40/5f423)     Spare  
424 Electrical fuse 424 (K40/5f424) 30t 0.5 RDGN Model 290 with code 898 (Wireless charging in rear passenger compartment) except code 224 (Individual rear seat system design): 
Mobile phone cradle control unit in rear passenger compartment (N123/10)		 7, 5
425 Electrical fuse 425 (K40/5f425) 30t 2.5 RDBU with code 906 (Front armrest heater): 
Armrest heater control unit (N5)		 30
426 Electrical fuse 426 (K40/5f426) 30t 0.35 RD Model 290 except code B26 (AMG Aerodynamics Package): 
Rear wing control unit (N170)		 15
427 Electrical fuse 427 (K40/5f427) 30t 2.5 RD Model 290 with code 467 (Electronic locking differential): 
Electric differential lock control unit (N3/2)		 25
428 Electrical fuse 428 (K40/5f428) 30t 1.5 RDWH With code 489 (AIR BODY CONTROL): 
AIR BODY CONTROL Plus control unit (N51/8)		 15
429 Electrical fuse 429 (K40/5f429) 30t 0.35 RD Model 290: 
DIRECT SELECT INTERFACE (N150)		 5
430 Electrical fuse 430 (K40/5f430) - - Spare -
431 Electrical fuse 431 (K40/5f431) - - Spare -
432 Electrical fuse 432 (K40/5f432) 30t 6.0 RD Model 290 with code 201 (Rear axle steering): 
Right rear axle steering control unit (N68/4)		 50
433 Electrical fuse 433 (K40/5f433) 30t 6.0 RD Model 290 with code 201 (Rear axle steering): 
Left rear axle steering control unit (N68/3)		 50
434 Electrical fuse 434 (K40/5f434) 30t 6.0 RDWH With code 489 (AIR BODY CONTROL): 
AIR BODY CONTROL relay (K67)		 40
435 Electrical fuse 435 (K40/5f435) 30t 4.0 RDVT Model 257 with code 881 (Remote trunk closing): 
Trunk lid control control unit (N121)		 50
        Model 290: 
Tailgate control control unit (N121/1)		  
436...441 Electrical fuse 436 (K40/5f436) - Electrical fuse 441 (K40/5f441)     Spare  
442 Electrical fuse 442 (K40/5f442) 30t 0.35 RD Model 290 with code 224 (Individual rear seat system design): 
Rear cup holder (R5/3)		 5
443 Electrical fuse 443 (K40/5f443) - - Spare -
444 Electrical fuse 444 (K40/5f444) 30t 1.5 RDWH With CODE 550 (Trailer hitch): 
Trailer recognition control unit (N28/1)		 20
445 Electrical fuse 445 (K40/5f445) 30t 2.5 RDGY With CODE 550 (Trailer hitch): 
Trailer recognition control unit (N28/1)		 30
446 Electrical fuse 446 (K40/5f446) 30t 2.5 RD With CODE 550 (Trailer hitch): 
Trailer recognition control unit (N28/1)		 30
447 Electrical fuse 447 (K40/5f447) 30t 1.5 RDBU With CODE 550 (Trailer hitch): 
Trailer recognition control unit (N28/1)		 20
448 Electrical fuse 448 (K40/5f448) 30t 2.5 RDYE With CODE 550 (Trailer hitch): 
Trailer recognition control unit (N28/1)		 30
449 Electrical fuse 449 (K40/5f449) 30t 2.5 RDBU With code U67 (230 volt socket in interior) or code U80 (115V socket): 
DC/AC converter control unit (N24/3)		 25
450 Electrical fuse 450 (K40/5f450) 30t 2.5 RDYE As of 11.12.2018, engine 256 with code M016 (Engine high-performance engine), engine 177: 
All-wheel drive control unit (N45)		 7, 5
451 Electrical fuse 451 (K40/5f451) 30t 2.5 RDBU With CODE 872 (Seat heater in rear): Rear seat heater control unit (N25/6) 30
452 Electrical fuse 452 (K40/5f452) 30t 2.5 RDGN Model 290 with code 466 (Active engine mount): 
Active engine mounts control unit (N3/42)		 20
453 Electrical fuse 453 (K40/5f453) 30t 2.5 RDGY With code 902 (Seat heater plus for driver and front passenger): 
Driver seat heater control unit (N25/5)		 30
454 Electrical fuse 454 (K40/5f454) 30t 1.5 RDWH With code 489 (AIR BODY CONTROL): 
AIR BODY CONTROL control unit (N51/3)		 15
        With code 459 (Steel suspension with adjustable damping): 
Adaptive damping system control unit (N51/5)		  
455 Electrical fuse 455 (K40/5f455) 87 0.5 RD With code U67 (230 volt socket in interior) or code U80 (115V socket): 
DC/AC converter control unit (N24/3)		 5
        Model 257 up to 01.07.2019: 
USB port, rear passenger compartment (X115/2)		  
456 Electrical fuse 456 (K40/5f456) 87 1.5 RDWH Luggage compartment socket (X58/12) 15
457 Electrical fuse 457 (K40/5f457) 87 1.5 RDBK Model 257 except code 897 (Wireless mobile phone charging) and except code 899 (Multifunction telephony) with code 301 (Smoker's Package), model 290 with code 301 (Smoker's Package): 
Front cigarette lighter with ashtray illumination (R3)		 15
        Except code 301 (Smoker's package): 
Vehicle interior socket, front (X58/17)		  
      1.0 RDBU With code 866 (Pre-installation for Rear Seat Entertainment System): 
Driver's seat Rear Seat Entertainment system electrical connector (X55/3) and front passenger seat Rear Seat Entertainment system electrical connector (X55/4)		  
      1.5 RDBK Model 257 with code 460 (Canada version) or code 494 (USA version) and code 897 (Wireless mobile phone charging) or code 899 (Multifunction telephony): 
Front passenger footwell socket (X58/40)		  
458 Electrical fuse 458 (K40/5f458) 87 1.5 RDBN With code 301 (Smoker's package): 
Rear cigarette lighter (R3/1)		 15
        Except code 301 (Smoker's package): 
Rear center console socket (X58/18)		  
459 Electrical fuse 459 (K40/5f459) 87 0.5 RD Model 290: 
Drive Unit control unit (N145/1)		 15
460...463 Electrical fuse 460 (K40/5f460) - Electrical fuse 463 (K40/5f463)     Spare  
464 Electrical fuse 464 (K40/5f464) 30t 0.5 RD Model 290: 
Drive Unit control unit (N145/1)		 5
465 Electrical fuse 465 (K40/5f465) - - Spare -
466 Electrical fuse 466 (K40/5f466) - - Spare -
467 Electrical fuse 467 (K40/5f467) 30t 0.5 RDGN With code 475 (Tire pressure monitoring system): 
Tire pressure monitoring system control unit (N88)		 5
468 Electrical fuse 468 (K40/5f468) 30t 0.5 RDWH With code 235 (Parking Pilot with PARKTRONIC): 
Parking system control unit (N62)		 7, 5
        With code 218 (Reversing camera) and except code 235 (Parking Pilot with PARKTRONIC): 
Reversing camera control unit (N66/2)		  
469 Electrical fuse 469 (K40/5f469) 30t 0.5 RDBU With CODE 871 (HANDS-FREE ACCESS): 
Rear switching module (N38)		 5
470 Electrical fuse 470 (K40/5f470) 30t 0.5 RDYE Model 290 with code 467 (Electronic locking differential): 
Electric differential lock control unit (N3/2)		 5
471 Electrical fuse 471 (K40/5f471) - - Spare -
472 Electrical fuse 472 (K40/5f472) - - Spare -
473 Electrical fuse 473 (K40/5f473) 30t 4.0 RDWH Model 257 with code U79 (BlueTEC (SCR) diesel exhaust gas cleaning, generation 3): 
AdBlue® control unit (N118/5)		 40
474 Electrical fuse 474 (K40/5f474) 87 4.0 RDBU Rear window heater (R1) 50
475 Electrical fuse 475 (K40/5f475) 30t 4.0 RD With code 810 (Sound system): 
Sound system amplifier control unit (N40/3)		 40
        With code 811 (Advanced sound system): 
Advanced sound system amplifier control unit (N40/7)		  
        Model 257 with engine 256 and code M016 (High performance boosted engine) except code B63 (Sporty engine sound) and except code 810 (Sound system) and except code 811 (Advanced sound system): 
Midline sound system amplifier control unit (N40/2)		  
476 Electrical fuse 476 (K40/5f476) 30t 4.0 RDBK Rear SAM control unit (N10/8) 40
477 Electrical fuse 477 (K40/5f477) 30t 4.0 RDGY Rear SAM control unit (N10/8) 40
478 Electrical fuse 478 (K40/5f478) 30t 4.0 RD With code 811 (Advanced sound system): 
Advanced sound system amplifier control unit (N40/7)		 40
479 Electrical fuse 479 (K40/5f479) - - Spare -
480 Electrical fuse 480 (K40/5f480) 30t 0.5 RD Model 290 with code 224 (Individual rear seat system design): 
Touchscreen (A105/3)		 5
481...484 Electrical fuse 481 (K40/5f481) - Electrical fuse 484 (K40/5f484)     Spare
IMPORTANT The rear fuse and relay module is installed in two variants, depending on the equipment involved.
Relay Identification Designation
S Reserve relay (K40/5kS)
T Rear window heater relay (K40/5kT)
U Reserve relay (K40/5kU)
V Reserve relay (K40/5kV)
X Rear Seat Entertainment system relay and sockets (K40/5kX)
Y Spare relay (K40/5kY)

Model 257, variant 1 

Fig 2: Rear Fuse And Relay Module - Model 257 (Variant 2)
G14549319IMPORTANTCourtesy of MERCEDES-BENZ USA
Slot Fuse Identification Circuit Wire Identification Fused component Fuse rating (A)
400...402 Electrical fuse 400 (K40/5f400) - Electrical fuse 402 (K40/5f402)     Spare  
403 Electrical fuse 403 (K40/5f403) 87 2.5 RDYE Except code 278 (Fully electric front seats) and except code 275 (Memory Package): 
Front passenger seat partially electric seat adjustment switch (S23/1)		 30
404 Electrical fuse 404 (K40/5f404) 87 2.5 RDGN Except code 278 (Fully electric front seats) and except code 275 (Memory Package): 
Driver seat partially electric seat adjustment switch (S22/1)		 30
405 Electrical fuse 405 (K40/5f405) 87 0.5 RD Model 290 except code 224 (Design individual rear seat system) 
USB port in rear passenger compartment at left (X115/3) USB port in rear passenger compartment at right (X115/4)		 :5
        Model 290 with code 224 (Individual rear seat system design): 
Rear cup holder (R5/3)		  
406 Electrical fuse 406 (K40/5f406) 30t 0.5 RDOG With code 380 (Car Telephony Package) and code 899 (Multifunction telephony): Telephone antenna changeover switch (A2/168) 5
407 Electrical fuse 407 (K40/5f407) 30t 2.5 RDWH With code 432 (Left and right dynamic multicontour seat: 
Multicontour seat pneumatic pump (M40)		 30
408 Electrical fuse 408 (K40/5f408) 30t 2.5 RDBU or 2.5 RD With code 811 (Advanced sound system): 
Rear woofer amplifier (N40/14)		 30
        Model 257 with code B63 (Sporty engine sound), except code 810 (Sound system) and except code 811 (Advanced sound system): 
Engine sound control unit (N40/1)		  
409 Electrical fuse 409 (K40/5f409) 30t 1.0 RDBK Model 257 with code U79 (BlueTEC (SCR) diesel exhaust gas cleaning, generation 3): 
AdBlue® control unit (N118/5)		 15
410 Electrical fuse 410 (K40/5f410) 30t 0.5 RDYE With code B01 (48V technology): 
DC/DC converter control unit (N83/1)		 5
411 Electrical fuse 411 (K40/5f411) 30t 2.5 RD Fuel system control unit (N118) 25
412 Electrical fuse 412 (K40/5f412) 30t 0.5 RD Model 257 with code 531 (COMAND APS) and code 830 (Additional parts for China vehicles), model 290 with code 531 (COMAND APS) and except code 498 (Japan version): 
Rear passenger compartment multimedia connection (A90/7)		 7, 5
        Model 257 up to 30.06.2019: 
USB port, rear passenger compartment (X115/2)		  
        Model 290 except code 224 (Design individual rear seat system): 
USB port, rear passenger compartment (X115/2) USB port in rear passenger compartment at left (X115/3) USB port in rear passenger compartment at right (X115/4)		  
        Model 290 with code 224 (Individual rear seat system design): 
USB port in rear passenger compartment at left (X115/3) USB port in rear passenger compartment at right (X115/4)		  
413 Electrical fuse 413 (K40/5f413) 30t 0.5 RDBK With code B01 (48V technology): 
48 V on-board electrical system battery (G1/3)		 5
414 Electrical fuse 414 (K40/5f414) 30t 0.5 RDWH With code 865 (TV tuner): 
TV tuner control unit (N143)		 5
415 Electrical fuse 415 (K40/5f415) 30t 0.5 RDGN With code 233 (DISTRONIC PLUS): 
Mercedes-Benz Intelligent Drive control unit (N62/4)		 5
416 Electrical fuse 416 (K40/5f416) 30t 0.5 RD With code B24 (Remote control for stationary heater): 
Stationary heater radio remote control receiver (A6/1)		 5
417 Electrical fuse 417 (K40/5f417) 30t 0.75 RD With code 891 (Premium ambient lighting): 
Ambiance illumination control unit (N162)		 7, 5
418...423 Electrical fuse 418 (K40/5f418) - Electrical fuse 423 (K40/5f423)     Spare  
424 Electrical fuse 424 (K40/5f424) 30t 0.5 RDGN Model 290 with code 898 (Wireless charging in rear passenger compartment) except code 224 (Individual rear seat system design): 
Mobile phone cradle control unit in rear passenger compartment (N123/10)		 7, 5
425 Electrical fuse 425 (K40/5f425) 30t 2.5 RDBU with code 906 (Front armrest heater): 
Armrest heater control unit (N5)		 30
426 Electrical fuse 426 (K40/5f426) 30t 0.35 RD Model 290 except code B26 (AMG Aerodynamics Package): 
Rear wing control unit (N170)		 15
427 Electrical fuse 427 (K40/5f427) 30t 2.5 RD Model 290 with code 467 (Electronic locking differential): 
Electric differential lock control unit (N3/2)		 25
428 Electrical fuse 428 (K40/5f428) 30t 1.5 RDWH With code 489 (AIR BODY CONTROL): 
AIR BODY CONTROL Plus control unit (N51/8)		 15
429 Electrical fuse 429 (K40/5f429) 30t 0.35 RD Model 290: 
DIRECT SELECT INTERFACE (N150)		 5
430 Electrical fuse 430 (K40/5f430) - - Spare -
431 Electrical fuse 431 (K40/5f431) - - Spare -
432 Electrical fuse 432 (K40/5f432) 30t 6.0 RD Model 290 with code 201 (Rear axle steering): 
Right rear axle steering control unit (N68/4)		 50
433 Electrical fuse 433 (K40/5f433) 30t 6.0 RD Model 290 with code 201 (Rear axle steering): 
Left rear axle steering control unit (N68/3)		 50
434 Electrical fuse 434 (K40/5f434) 30t 6.0 RDWH With code 489 (AIR BODY CONTROL): 
AIR BODY CONTROL relay (K67)		 40
435 Electrical fuse 435 (K40/5f435) 30t 4.0 RDVT Model 257 with code 881 (Remote trunk closing): 
Trunk lid control control unit (N121)		 50
        Model 290: 
Tailgate control control unit (N121/1)		  
436...441 Electrical fuse 436 (K40/5f436) - Electrical fuse 441 (K40/5f441)     Spare  
442 Electrical fuse 442 (K40/5f442) 30t 0.35 RD Model 290 with code 224 (Individual rear seat system design): 
Rear cup holder (R5/3)		 5
443 Electrical fuse 443 (K40/5f443) - - Spare -
444 Electrical fuse 444 (K40/5f444) 30t 1.5 RDWH With CODE 550 (Trailer hitch): 
Trailer recognition control unit (N28/1)		 20
445 Electrical fuse 445 (K40/5f445) 30t 2.5 RDGY With CODE 550 (Trailer hitch): 
Trailer recognition control unit (N28/1)		 30
446 Electrical fuse 446 (K40/5f446) 30t 2.5 RD With CODE 550 (Trailer hitch): 
Trailer recognition control unit (N28/1)		 30
447 Electrical fuse 447 (K40/5f447) 30t 1.5 RDBU With CODE 550 (Trailer hitch): 
Trailer recognition control unit (N28/1)		 20
448 Electrical fuse 448 (K40/5f448) 30t 2.5 RDYE With CODE 550 (Trailer hitch): 
Trailer recognition control unit (N28/1)		 30
449 Electrical fuse 449 (K40/5f449) 30t 2.5 RDBU With code U67 (230 volt socket in interior) or code U80 (115V socket): 
DC/AC converter control unit (N24/3)		 25
450 Electrical fuse 450 (K40/5f450) 30t 2.5 RDYE As of 11.12.2018, engine 256 with code M016 (Engine high-performance engine), engine 177: 
All-wheel drive control unit (N45)		 7, 5
451 Electrical fuse 451 (K40/5f451) 30t 2.5 RDBU With CODE 872 (Seat heater in rear): Rear seat heater control unit (N25/6) 30
452 Electrical fuse 452 (K40/5f452) 30t 2.5 RDGN Model 290 with code 466 (Active engine mount): 
Active engine mounts control unit (N3/42)		 20
453 Electrical fuse 453 (K40/5f453) 30t 2.5 RDGY With code 902 (Seat heater plus for driver and front passenger): 
Driver seat heater control unit (N25/5)		 30
454 Electrical fuse 454 (K40/5f454) 30t 1.5 RDWH With code 489 (AIR BODY CONTROL): 
AIR BODY CONTROL control unit (N51/3)		 15
        With code 459 (Steel suspension with adjustable damping): 
Adaptive damping system control unit (N51/5)		  
455 Electrical fuse 455 (K40/5f455) 87 0.5 RD With code U67 (230 volt socket in interior) or code U80 (115V socket): 
DC/AC converter control unit (N24/3)		 5
        Model 257 up to 01.07.2019: 
USB port, rear passenger compartment (X115/2)		  
456 Electrical fuse 456 (K40/5f456) 87 1.5 RDWH Luggage compartment socket (X58/12) 15
457 Electrical fuse 457 (K40/5f457) 87 1.5 RDBK Model 257 except code 897 (Wireless mobile phone charging) and except code 899 (Multifunction telephony) with code 301 (Smoker's Package), model 290 with code 301 (Smoker's Package): 
Front cigarette lighter with ashtray illumination (R3)		 15
        Except code 301 (Smoker's package): 
Vehicle interior socket, front (X58/17)		  
      1.0 RDBU With code 866 (Pre-installation for Rear Seat Entertainment System): 
Driver's seat Rear Seat Entertainment system electrical connector (X55/3) and front passenger seat Rear Seat Entertainment system electrical connector (X55/4)		  
      1.5 RDBK Model 257 with code 460 (Canada version) or code 494 (USA version) and code 897 (Wireless mobile phone charging) or code 899 (Multifunction telephony): 
Front passenger footwell socket (X58/40)		  
458 Electrical fuse 458 (K40/5f458) 87 1.5 RDBN With code 301 (Smoker's package): 
Rear cigarette lighter (R3/1)		 15
        Except code 301 (Smoker's package): 
Rear center console socket (X58/18)		  
459 Electrical fuse 459 (K40/5f459) 87 0.5 RD Model 290: 
Drive Unit control unit (N145/1)		 15
460...463 Electrical fuse 460 (K40/5f460) - Electrical fuse 463 (K40/5f463)     Spare  
464 Electrical fuse 464 (K40/5f464) 30t 0.5 RD Model 290: 
Drive Unit control unit (N145/1)		 5
465 Electrical fuse 465 (K40/5f465) - - Spare -
466 Electrical fuse 466 (K40/5f466) - - Spare -
467 Electrical fuse 467 (K40/5f467) 30t 0.5 RDGN With code 475 (Tire pressure monitoring system): 
Tire pressure monitoring system control unit (N88)		 5
468 Electrical fuse 468 (K40/5f468) 30t 0.5 RDWH With code 235 (Parking Pilot with PARKTRONIC): 
Parking system control unit (N62)		 7, 5
        With code 218 (Reversing camera) and except code 235 (Parking Pilot with PARKTRONIC): 
Reversing camera control unit (N66/2)		  
469 Electrical fuse 469 (K40/5f469) 30t 0.5 RDBU With CODE 871 (HANDS-FREE ACCESS): 
Rear switching module (N38)		 5
470 Electrical fuse 470 (K40/5f470) 30t 0.5 RDYE Model 290 with code 467 (Electronic locking differential): 
Electric differential lock control unit (N3/2)		 5
471 Electrical fuse 471 (K40/5f471) - - Spare -
472 Electrical fuse 472 (K40/5f472) - - Spare -
473 Electrical fuse 473 (K40/5f473) 30t 4.0 RDWH Model 257 with code U79 (BlueTEC (SCR) diesel exhaust gas cleaning, generation 3): 
AdBlue® control unit (N118/5)		 40
474 Electrical fuse 474 (K40/5f474) 87 4.0 RDBU Rear window heater (R1) 50
475 Electrical fuse 475 (K40/5f475) 30t 4.0 RD With code 810 (Sound system): 
Sound system amplifier control unit (N40/3)		 40
        With code 811 (Advanced sound system): 
Advanced sound system amplifier control unit (N40/7)		  
        Model 257 with engine 256 and code M016 (High performance boosted engine) except code B63 (Sporty engine sound) and except code 810 (Sound system) and except code 811 (Advanced sound system): 
Midline sound system amplifier control unit (N40/2)		  
476 Electrical fuse 476 (K40/5f476) 30t 4.0 RDBK Rear SAM control unit (N10/8) 40
477 Electrical fuse 477 (K40/5f477) 30t 4.0 RDGY Rear SAM control unit (N10/8) 40
478 Electrical fuse 478 (K40/5f478) 30t 4.0 RD With code 811 (Advanced sound system): 
Advanced sound system amplifier control unit (N40/7)		 40
479 Electrical fuse 479 (K40/5f479) - - Spare -
480 Electrical fuse 480 (K40/5f480) 30t 0.5 RD Model 290 with code 224 (Individual rear seat system design): 
Touchscreen (A105/3)		 5
481...484 Electrical fuse 481 (K40/5f481) - Electrical fuse 484 (K40/5f484)     Spare
IMPORTANT The rear fuse and relay module is installed in two variants, depending on the equipment involved.
Relay Identification Designation
S Reserve relay (K40/5kS)
T Rear window heater relay (K40/5kT)
U Reserve relay (K40/5kU)
V Reserve relay (K40/5kV)
X Rear Seat Entertainment system relay and sockets (K40/5kX)
Y Spare relay (K40/5kY)

Model 257, variant 2 

IMPORTANT The rear fuse and relay module is installed in two variants, depending on the equipment involved.

G14549320Courtesy of MERCEDES-BENZ USA

Model 290 

Slot Fuse Identification Circuit Wire Identification Fused component Fuse rating (A)
400...402 Electrical fuse 400 (K40/5f400) - Electrical fuse 402 (K40/5f402)     Spare  
403 Electrical fuse 403 (K40/5f403) 87 2.5 RDYE Except code 278 (Fully electric front seats) and except code 275 (Memory Package): 
Front passenger seat partially electric seat adjustment switch (S23/1)		 30
404 Electrical fuse 404 (K40/5f404) 87 2.5 RDGN Except code 278 (Fully electric front seats) and except code 275 (Memory Package): 
Driver seat partially electric seat adjustment switch (S22/1)		 30
405 Electrical fuse 405 (K40/5f405) 87 0.5 RD Model 290 except code 224 (Design individual rear seat system) 
USB port in rear passenger compartment at left (X115/3) USB port in rear passenger compartment at right (X115/4)		 :5
        Model 290 with code 224 (Individual rear seat system design): 
Rear cup holder (R5/3)		  
406 Electrical fuse 406 (K40/5f406) 30t 0.5 RDOG With code 380 (Car Telephony Package) and code 899 (Multifunction telephony): Telephone antenna changeover switch (A2/168) 5
407 Electrical fuse 407 (K40/5f407) 30t 2.5 RDWH With code 432 (Left and right dynamic multicontour seat: 
Multicontour seat pneumatic pump (M40)		 30
408 Electrical fuse 408 (K40/5f408) 30t 2.5 RDBU or 2.5 RD With code 811 (Advanced sound system): 
Rear woofer amplifier (N40/14)		 30
        Model 257 with code B63 (Sporty engine sound), except code 810 (Sound system) and except code 811 (Advanced sound system): 
Engine sound control unit (N40/1)		  
409 Electrical fuse 409 (K40/5f409) 30t 1.0 RDBK Model 257 with code U79 (BlueTEC (SCR) diesel exhaust gas cleaning, generation 3): 
AdBlue® control unit (N118/5)		 15
410 Electrical fuse 410 (K40/5f410) 30t 0.5 RDYE With code B01 (48V technology): 
DC/DC converter control unit (N83/1)		 5
411 Electrical fuse 411 (K40/5f411) 30t 2.5 RD Fuel system control unit (N118) 25
412 Electrical fuse 412 (K40/5f412) 30t 0.5 RD Model 257 with code 531 (COMAND APS) and code 830 (Additional parts for China vehicles), model 290 with code 531 (COMAND APS) and except code 498 (Japan version): 
Rear passenger compartment multimedia connection (A90/7)		 7, 5
        Model 257 up to 30.06.2019: 
USB port, rear passenger compartment (X115/2)		  
        Model 290 except code 224 (Design individual rear seat system): 
USB port, rear passenger compartment (X115/2) USB port in rear passenger compartment at left (X115/3) USB port in rear passenger compartment at right (X115/4)		  
        Model 290 with code 224 (Individual rear seat system design): 
USB port in rear passenger compartment at left (X115/3) USB port in rear passenger compartment at right (X115/4)		  
413 Electrical fuse 413 (K40/5f413) 30t 0.5 RDBK With code B01 (48V technology): 
48 V on-board electrical system battery (G1/3)		 5
414 Electrical fuse 414 (K40/5f414) 30t 0.5 RDWH With code 865 (TV tuner): 
TV tuner control unit (N143)		 5
415 Electrical fuse 415 (K40/5f415) 30t 0.5 RDGN With code 233 (DISTRONIC PLUS): 
Mercedes-Benz Intelligent Drive control unit (N62/4)		 5
416 Electrical fuse 416 (K40/5f416) 30t 0.5 RD With code B24 (Remote control for stationary heater): 
Stationary heater radio remote control receiver (A6/1)		 5
417 Electrical fuse 417 (K40/5f417) 30t 0.75 RD With code 891 (Premium ambient lighting): 
Ambiance illumination control unit (N162)		 7, 5
418...423 Electrical fuse 418 (K40/5f418) - Electrical fuse 423 (K40/5f423)     Spare  
424 Electrical fuse 424 (K40/5f424) 30t 0.5 RDGN Model 290 with code 898 (Wireless charging in rear passenger compartment) except code 224 (Individual rear seat system design): 
Mobile phone cradle control unit in rear passenger compartment (N123/10)		 7, 5
425 Electrical fuse 425 (K40/5f425) 30t 2.5 RDBU with code 906 (Front armrest heater): 
Armrest heater control unit (N5)		 30
426 Electrical fuse 426 (K40/5f426) 30t 0.35 RD Model 290 except code B26 (AMG Aerodynamics Package): 
Rear wing control unit (N170)		 15
427 Electrical fuse 427 (K40/5f427) 30t 2.5 RD Model 290 with code 467 (Electronic locking differential): 
Electric differential lock control unit (N3/2)		 25
428 Electrical fuse 428 (K40/5f428) 30t 1.5 RDWH With code 489 (AIR BODY CONTROL): 
AIR BODY CONTROL Plus control unit (N51/8)		 15
429 Electrical fuse 429 (K40/5f429) 30t 0.35 RD Model 290: 
DIRECT SELECT INTERFACE (N150)		 5
430 Electrical fuse 430 (K40/5f430) - - Spare -
431 Electrical fuse 431 (K40/5f431) - - Spare -
432 Electrical fuse 432 (K40/5f432) 30t 6.0 RD Model 290 with code 201 (Rear axle steering): 
Right rear axle steering control unit (N68/4)		 50
433 Electrical fuse 433 (K40/5f433) 30t 6.0 RD Model 290 with code 201 (Rear axle steering): 
Left rear axle steering control unit (N68/3)		 50
434 Electrical fuse 434 (K40/5f434) 30t 6.0 RDWH With code 489 (AIR BODY CONTROL): 
AIR BODY CONTROL relay (K67)		 40
435 Electrical fuse 435 (K40/5f435) 30t 4.0 RDVT Model 257 with code 881 (Remote trunk closing): 
Trunk lid control control unit (N121)		 50
        Model 290: 
Tailgate control control unit (N121/1)		  
436...441 Electrical fuse 436 (K40/5f436) - Electrical fuse 441 (K40/5f441)     Spare  
442 Electrical fuse 442 (K40/5f442) 30t 0.35 RD Model 290 with code 224 (Individual rear seat system design): 
Rear cup holder (R5/3)		 5
443 Electrical fuse 443 (K40/5f443) - - Spare -
444 Electrical fuse 444 (K40/5f444) 30t 1.5 RDWH With CODE 550 (Trailer hitch): 
Trailer recognition control unit (N28/1)		 20
445 Electrical fuse 445 (K40/5f445) 30t 2.5 RDGY With CODE 550 (Trailer hitch): 
Trailer recognition control unit (N28/1)		 30
446 Electrical fuse 446 (K40/5f446) 30t 2.5 RD With CODE 550 (Trailer hitch): 
Trailer recognition control unit (N28/1)		 30
447 Electrical fuse 447 (K40/5f447) 30t 1.5 RDBU With CODE 550 (Trailer hitch): 
Trailer recognition control unit (N28/1)		 20
448 Electrical fuse 448 (K40/5f448) 30t 2.5 RDYE With CODE 550 (Trailer hitch): 
Trailer recognition control unit (N28/1)		 30
449 Electrical fuse 449 (K40/5f449) 30t 2.5 RDBU With code U67 (230 volt socket in interior) or code U80 (115V socket): 
DC/AC converter control unit (N24/3)		 25
450 Electrical fuse 450 (K40/5f450) 30t 2.5 RDYE As of 11.12.2018, engine 256 with code M016 (Engine high-performance engine), engine 177: 
All-wheel drive control unit (N45)		 7, 5
451 Electrical fuse 451 (K40/5f451) 30t 2.5 RDBU With CODE 872 (Seat heater in rear): Rear seat heater control unit (N25/6) 30
452 Electrical fuse 452 (K40/5f452) 30t 2.5 RDGN Model 290 with code 466 (Active engine mount): 
Active engine mounts control unit (N3/42)		 20
453 Electrical fuse 453 (K40/5f453) 30t 2.5 RDGY With code 902 (Seat heater plus for driver and front passenger): 
Driver seat heater control unit (N25/5)		 30
454 Electrical fuse 454 (K40/5f454) 30t 1.5 RDWH With code 489 (AIR BODY CONTROL): 
AIR BODY CONTROL control unit (N51/3)		 15
        With code 459 (Steel suspension with adjustable damping): 
Adaptive damping system control unit (N51/5)		  
455 Electrical fuse 455 (K40/5f455) 87 0.5 RD With code U67 (230 volt socket in interior) or code U80 (115V socket): 
DC/AC converter control unit (N24/3)		 5
        Model 257 up to 01.07.2019: 
USB port, rear passenger compartment (X115/2)		  
456 Electrical fuse 456 (K40/5f456) 87 1.5 RDWH Luggage compartment socket (X58/12) 15
457 Electrical fuse 457 (K40/5f457) 87 1.5 RDBK Model 257 except code 897 (Wireless mobile phone charging) and except code 899 (Multifunction telephony) with code 301 (Smoker's Package), model 290 with code 301 (Smoker's Package): 
Front cigarette lighter with ashtray illumination (R3)		 15
        Except code 301 (Smoker's package): 
Vehicle interior socket, front (X58/17)		  
      1.0 RDBU With code 866 (Pre-installation for Rear Seat Entertainment System): 
Driver's seat Rear Seat Entertainment system electrical connector (X55/3) and front passenger seat Rear Seat Entertainment system electrical connector (X55/4)		  
      1.5 RDBK Model 257 with code 460 (Canada version) or code 494 (USA version) and code 897 (Wireless mobile phone charging) or code 899 (Multifunction telephony): 
Front passenger footwell socket (X58/40)		  
458 Electrical fuse 458 (K40/5f458) 87 1.5 RDBN With code 301 (Smoker's package): 
Rear cigarette lighter (R3/1)		 15
        Except code 301 (Smoker's package): 
Rear center console socket (X58/18)		  
459 Electrical fuse 459 (K40/5f459) 87 0.5 RD Model 290: 
Drive Unit control unit (N145/1)		 15
460...463 Electrical fuse 460 (K40/5f460) - Electrical fuse 463 (K40/5f463)     Spare  
464 Electrical fuse 464 (K40/5f464) 30t 0.5 RD Model 290: 
Drive Unit control unit (N145/1)		 5
465 Electrical fuse 465 (K40/5f465) - - Spare -
466 Electrical fuse 466 (K40/5f466) - - Spare -
467 Electrical fuse 467 (K40/5f467) 30t 0.5 RDGN With code 475 (Tire pressure monitoring system): 
Tire pressure monitoring system control unit (N88)		 5
468 Electrical fuse 468 (K40/5f468) 30t 0.5 RDWH With code 235 (Parking Pilot with PARKTRONIC): 
Parking system control unit (N62)		 7, 5
        With code 218 (Reversing camera) and except code 235 (Parking Pilot with PARKTRONIC): 
Reversing camera control unit (N66/2)		  
469 Electrical fuse 469 (K40/5f469) 30t 0.5 RDBU With CODE 871 (HANDS-FREE ACCESS): 
Rear switching module (N38)		 5
470 Electrical fuse 470 (K40/5f470) 30t 0.5 RDYE Model 290 with code 467 (Electronic locking differential): 
Electric differential lock control unit (N3/2)		 5
471 Electrical fuse 471 (K40/5f471) - - Spare -
472 Electrical fuse 472 (K40/5f472) - - Spare -
473 Electrical fuse 473 (K40/5f473) 30t 4.0 RDWH Model 257 with code U79 (BlueTEC (SCR) diesel exhaust gas cleaning, generation 3): 
AdBlue® control unit (N118/5)		 40
474 Electrical fuse 474 (K40/5f474) 87 4.0 RDBU Rear window heater (R1) 50
475 Electrical fuse 475 (K40/5f475) 30t 4.0 RD With code 810 (Sound system): 
Sound system amplifier control unit (N40/3)		 40
        With code 811 (Advanced sound system): 
Advanced sound system amplifier control unit (N40/7)		  
        Model 257 with engine 256 and code M016 (High performance boosted engine) except code B63 (Sporty engine sound) and except code 810 (Sound system) and except code 811 (Advanced sound system): 
Midline sound system amplifier control unit (N40/2)		  
476 Electrical fuse 476 (K40/5f476) 30t 4.0 RDBK Rear SAM control unit (N10/8) 40
477 Electrical fuse 477 (K40/5f477) 30t 4.0 RDGY Rear SAM control unit (N10/8) 40
478 Electrical fuse 478 (K40/5f478) 30t 4.0 RD With code 811 (Advanced sound system): 
Advanced sound system amplifier control unit (N40/7)		 40
479 Electrical fuse 479 (K40/5f479) - - Spare -
480 Electrical fuse 480 (K40/5f480) 30t 0.5 RD Model 290 with code 224 (Individual rear seat system design): 
Touchscreen (A105/3)		 5
481...484 Electrical fuse 481 (K40/5f481) - Electrical fuse 484 (K40/5f484)     Spare
IMPORTANT The rear fuse and relay module is installed in two variants, depending on the equipment involved.
Relay Identification Designation
S Reserve relay (K40/5kS)
T Rear window heater relay (K40/5kT)
U Reserve relay (K40/5kU)
V Reserve relay (K40/5kV)
X Rear Seat Entertainment system relay and sockets (K40/5kX)
Y Spare relay (K40/5kY)
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