LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Mercedes Benz >> 2018 >> S450 Base >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Collision/Avoidance >> Electrical System, Equipment & Instruments - 222 Chassis (02 Of 10) >> Basic Knowledge >> Assignment Of Rear Fuse And Relay Module >> Assignment Of Rear Fuse And Relay Module - GF54.15-P-1256-30LF
April 5, 2026: LEMON Manuals is launched! Read the announcement.

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

Model 217, 222 

up to Model year 2018 

Fig 1: Rear Fuse And Relay Module - Model 222 Up To Model Year 2018
G15299363Courtesy of MERCEDES-BENZ USA
Slot Fuse Identification Circuit Line ID (line fused) Fused function Rating in amperes (A)
400 Electrical fuse 400 (K40/5f400) 30g 0.75 RDWH With code 235 (Parking Pilot with PARKTRONIC): 
Parking system control unit (N62)
10
401 Electrical fuse 401 (K40/5f401) 30g 0.35 BK Model 217, Model 222 with code 881 (Remote trunk closing): 
Trunk lid control, control unit (N121)
5
402 Electrical fuse 402 (K40/5f402) 30g 1.5 RDWH Model 222 with code 864 (Rear Seat Entertainment system): 
Rear entertainment controller unit (A26/18)
7.5
403 Electrical fuse 403 (K40/5f403) 30g - Spare -
404 Electrical fuse 404 (K40/5f404) 30g 0.5 RDYE With code 906 (Front armrest heater), Model 222 with code 907 (Rear armrest heater): 
Armrest heater control unit (N5)
7.5
405 Electrical fuse 405 (K40/5f405) 30g 0.75 RD With code 810 (Sound system) or code 811 (Advanced sound system): 
Sound system amplifier control unit (N40/3)
7.5
        Model 222 with code 811 (Advanced sound system): 
Left front door tweeter control unit (N160/1) Right front door tweeter control unit (N160/2)
 
406 Electrical fuse 406 (K40/5f406) 30g 0.5 RDBK Model 217.4 with code 403 (AIRSCARF system): 
AIRSCARF control unit (N25/7)
5
407 Electrical fuse 407 (K40/5f407) 30g - Spare -
408 Electrical fuse 408 (K40/5f408) 30g 0.75 RDWH With code 536 (SIRIUS satellite radio) or code 537 (Digital radio (DAB)) or code 865 (TV tuner): 
Tuner unit (A90/4)
5
409 Electrical fuse 409 (K40/5f409) 30g 0.75 RD With code 501 (360° camera): 
360° camera control unit (N148)
5
      0.5 RD Model 217, Model 222 with code 218 (Reversing camera): 
Reversing camera (B84/3)
 
410 Electrical fuse 410 (K40/5f410) 30g 0.5 RD Model 217, Model 222 with code 218 (Reversing camera) or code 501 (360° camera): 
Camera cover control unit (N42)
5
411 Electrical fuse 411 (K40/5f411) 30g 0.5 RDWH With code 475 (Tire pressure monitor): 
Tire pressure monitoring system control unit (N88)
5
412 Electrical fuse 412 (K40/5f412) 30g 0.75 RDPK With CODE 872 (Seat heater in rear): 
Rear seat heater control unit (N25/6)
7.5
413 Electrical fuse 413 (K40/5f413) 30g 1.0 RDWH Model 222 with code 864 (Rear Seat Entertainment system): 
Left rear display (A40/5) Right rear display (A40/6)
10
414 Electrical fuse 414 (K40/5f414) 30g 0.75 RD Model 222 with code 856 (Business telephony in rear compartment): 
Rear cellular telephone system antenna amplifier/compensator (A28/16)
Rear mobile phone cradle (A34/18)
Rear mobile phone contact plate (X237/2)
7.5
        With code 379 (Telephone module with Bluetooth® (SAP profile)), Model 222 with code 856 (Business telephony in rear compartment): 
Telephone module with Bluetooth® (SAP profile) (A34/1)
 
415 Electrical fuse 415 (K40/5f415) 30g 1.5 RDWH Model 222 with code Z07 (Highest protection): 
Special-purpose vehicle fuse block 1 (F80/1)
7.5
416 Electrical fuse 416 (K40/5f416) 30g - Spare -
417 Electrical fuse 417 (K40/5f417) 30 1.5 RD Model 222 with code 550 (Trailer hitch): 
Trailer recognition control unit (N28/1)
25
      4.0 RD Model 222 with code Z11 (Left front power window for special protection): 
Left front power window hydraulic pump relay (K4/11)
 
418 Electrical fuse 418 (K40/5f418) 30 2.5 RD Model 222 with code 965 (Taxi/rental car - preinstallation): 
Special-purpose vehicle multifunction control unit (N26/9)
25
      2.5 RDGN Model 222 with code Z07 (Highest protection): 
Special vehicle multifunction control unit (SVMCU) (N26/14)
 
419 Electrical fuse 419 (K40/5f419) 30 2.5 RDVT Model 222 with code 965 (Taxi/rental car - preinstallation): 
Special-purpose vehicle multifunction control unit (N26/9)
25
      2.5 RDBU Model 222 with code Z07 (Highest protection): 
Special vehicle multifunction control unit (SVMCU) (N26/14)
 
420 Electrical fuse 420 (K40/5f420) 30 2.5 RD Model 222 with code U80 (115V socket) or code U67 (230 volt socket in interior): 
DC/AC converter control unit (N24/3)
30
421 Electrical fuse 421 (K40/5f421) 30 2.5 RD With code 432 (Left and right dynamic multicontour seat), Model 222 with code 406 (Multicontour seats in rear passenger compartment): 
Multicontour seat pneumatic pump (M40)
30
422 Electrical fuse 422 (K40/5f422) 30 2.5 RD Model 222: 
Right rear door control unit (N69/4)
30
423 Electrical fuse 423 (K40/5f423) 30 4.0 RD Model 222 with code Z14 (Right rear power window for special protection): 
Right rear power window hydraulic pump relay (K4/14)
30
424 Electrical fuse 424 (K40/5f424) 30 4.0 RD Rear SAM control unit (N10/8) 40
425 Electrical fuse 425 (K40/5f425) 30 - Spare -
426 Electrical fuse 426 (K40/5f426) 30 2.5 RD With code 811 (Advanced sound system): 
Subwoofer amplifier (N40/9)
30
427 Electrical fuse 427 (K40/5f427) 30 2.5 RD With code 906 (Front armrest heater), Model 222 with code 907 (Rear armrest heater): 
Armrest heater control unit (N5)
20
428 Electrical fuse 428 (K40/5f428) 30 1.0 RD Model 222 with code 550 (Trailer hitch): 
Trailer recognition control unit (N28/1)
15
429 Electrical fuse 429 (K40/5f429) 30 0.75 RD Model 222 with code 224 (Design individual rear seat system): 
Rear cup holder (R5/3)
10
430 Electrical fuse 430 (K40/5f430) 30 1.5 RDBU With code 301 (Smoker's package): 
Cigarette lighter with ashtray illumination, rear (R3/1)
15
      1.5 PKRD With code 301 (Smoker's package): 
Cigarette lighter with rear center console illumination (R3/4)
 
431 Electrical fuse 431 (K40/5f431) 30 1.5 RDWH With code 308 (refrigerator box): 
Rear backrest refrigerator box (A39/1)
15
432 Electrical fuse 432 (K40/5f432) 15 0.75 GYBN Rear SAM control unit (N10/8) 10
433 Electrical fuse 433 (K40/5f433) 30 1.5 RDWH Model 222 with code U42 (BlueTEC (SCR) diesel exhaust treatment): 
AdBlue® control unit (N118/5)
25
434 Electrical fuse 434 (K40/5f434) 30 1.5 PKRD Model 222 with code U42 (BlueTEC (SCR) diesel exhaust treatment): 
AdBlue® control unit (N118/5)
15
435 Electrical fuse 435 (K40/5f435) 30 1.5 RD Model 222 with code U42 (BlueTEC (SCR) diesel exhaust treatment): 
AdBlue® control unit (N118/5)
20
436 Electrical fuse 436 (K40/5f436) 15R 0.5 BKRD Model 222 with code 224 (Design individual rear seat system): 
Rear cup holder (R5/3)
5
437 Electrical fuse 437 (K40/5f437) 15R - Spare -
438 Electrical fuse 438 (K40/5f438) 15R - Spare -
439 Electrical fuse 439 (K40/5f439) 15R - Spare -
440 Electrical fuse 440 (K40/5f440) 15R - Spare -
441 Electrical fuse 441 (K40/5f441) 30 - Spare -
442 Electrical fuse 442 (K40/5f442) 30 - Spare -
443 Electrical fuse 443 (K40/5f443) 30 0.35 RD With code 6U4 (Mercedes-Benz Ecall Russia (GLONASS) emergency call system): 
eCall Russia control unit (GLONASS) (N167)
5
444 Electrical fuse 444 (K40/5f444) 30 0.5 RD Model 222.163: 
Charger (N83/5)
5
445 Electrical fuse 445 (K40/5f445) 30 0.5 RD Model 217.3, 222 with code 228 (Stationary heater) and code B24 (Remote control for stationary heater): 
Stationary heater radio remote control receiver (A6/1)
5
446 Electrical fuse 446 (K40/5f446) 30 0.5 RD FM, AM, CL, DAB and KEYLESS-GO antenna amplifier (A2/18) 5
447 Electrical fuse 447 (K40/5f447) 30 1.0 RD Model 222.004/057/104/157/163: 
Battery management system control unit (N82/2)
7.5
      0.75 RD Model 222.163: 
DC/DC converter control unit (N83/1)
 
448 Electrical fuse 448 (K40/5f448) 30 - Spare -
449 Electrical fuse 449 (K40/5f449) 30 - Spare -
450 Electrical fuse 450 (K40/5f450) 30 - Spare -
451 Electrical fuse 451 (K40/5f451) 15 1.5 RDVT Model 222 with code 550 (Trailer hitch): 
Trailer recognition control unit (N28/1)
15
      2.5 PKRD Model 222 with code Z07 (Highest protection): 
Special-purpose vehicle fuse block 2 (F80/2)
 
452 Electrical fuse 452 (K40/5f452) 15 0.5 PKRD With code 237 (Active Blind Spot Assist) or code 238 (Active Lane Keeping Assist): 
Left rear bumper radar sensor (B29/6) Right rear bumper radar sensor (B29/7)
5
        With code 253 (Rear Collision Warning and Protection System) or code 238 (Active Lane Keeping Assist):  Center rear bumper radar sensor (B29/10)  
453 Electrical fuse 453 (K40/5f453) 15 0.5 PKRD With code P20 (Driving Assistance Plus Package): 
Left front bumper radar sensor (B29/2) Right front bumper radar sensor (B29/3)
5
        With code 258 (COLLISION PREVENTION ASSIST): 
COLLISION PREVENTION ASSIST controller unit (A90)
 
454 Electrical fuse 454 (K40/5f454) 15 0.5 PKBK Model 222 with code U42 (BlueTEC (SCR) diesel exhaust treatment): 
AdBlue® control unit (N118/5)
5
        Fuel system control unit (N118)  
455 Electrical fuse 455 (K40/5f455) 15 2.5 PKRD Fully integrated transmission control controller unit (Y3/8) 15
456 Electrical fuse 456 (K40/5f456) 15 1.0 PKRD Model 222.163: 
Accelerator pedal sensor (B37)
10
457 Electrical fuse 457 (K40/5f457) 15 0.75 PKRD With code U98 (LITHIUM-ION STARTER BATTERY (LISB)): 
Starter battery capacitor (C1)
10
458 Electrical fuse 458 (K40/5f458) 87 - Spare -
459 Electrical fuse 459 (K40/5f459) 87 - Spare -
460 Electrical fuse 460 (K40/5f460) 87 1.5 RDBK With code 301 (Smoker's package): 
Front cigarette lighter with ashtray illumination (R3)
15
461 Electrical fuse 461 (K40/5f461) 87 1.5 RDBU Model 222: 
Right rear center console socket 12V (X58/18) Socket 12V (X58/40)
Left rear center console socket 12V (X58/41)
15
      0.35 PKGN With code U80 (115V socket): 
115 V socket (X58/34)
 
      1.5 PKRD Model 217: 
Left rear center console socket 12V (X58/41)
 
462 Electrical fuse 462 (K40/5f462) 87 1.5 RD Luggage compartment socket (X58/12) 15
463 Electrical fuse 463 (K40/5f463) 87 - Spare -
464 Electrical fuse 464 (K40/5f464) 30 1.5 RD Model 222 with code 550 (Trailer hitch): 
Trailer recognition control unit (N28/1)
20
      4.0 RD Model 222 with code Z12 (Right front power window for special protection): 
Right front power window hydraulic pump relay (K4/12)
30
465 Electrical fuse 465 (K40/5f465) 30 4.0 RDBU Electric parking brake control unit (N128) 30
466 Electrical fuse 466 (K40/5f466) 30g 2.5 RD Left front door control unit (N69/1) 30
467 Electrical fuse 467 (K40/5f467) 30g 0.75 RD KEYLESS-GO control unit (N69/5) 10
468 Electrical fuse 468 (K40/5f468) 30 4.0 RDYE Electric parking brake control unit (N128) 30
469 Electrical fuse 469 (K40/5f469) 30 2.5 RD Fuel system control unit (N118) 25
470 Electrical fuse 470 (K40/5f470) 30 2.5 RD Model 222 with code P43 (Rear seat comfort package): 
Left rear seat heater control unit (N25/11)
30
        With CODE 872 (Seat heater in rear): 
Rear seat heater control unit (N25/6)
 
471 Electrical fuse 471 (K40/5f471) 30 2.5 RD Model 222 with code P43 (Rear seat comfort package): 
Right rear seat heater control unit (N25/12)
30
472 Electrical fuse 472 (K40/5f472) 30 2.5 RD Model 217: 
Rear control unit (N22/6)
30
      4.0 RD Model 222 with code Z13 (Left rear power window for special protection): 
Left rear power window hydraulic pump relay (K4/13)
 
      1.5 RD Model 222 with code 550 (Trailer hitch): 
Trailer recognition control unit (N28/1)
 
473 Electrical fuse 473 (K40/5f473) 30 1.5 RDWH Model 222 with code 550 (Trailer hitch): 
Trailer recognition control unit (N28/1)
20
474 Electrical fuse 474 (K40/5f474) - - Spare -
475 Electrical fuse 475 (K40/5f475) 30 4.0 RD With code 810 (Sound system) or code 811 (Advanced sound system): 
Sound system amplifier control unit (N40/3)
40
476 Electrical fuse 476 (K40/5f476) 30 4.0 RD With code 811 (Advanced sound system): 
Sound system amplifier control unit (N40/3)
40
477 Electrical fuse 477 (K40/5f477) 30 4.0 RD Model 222 with code 305 (Rear PRE-SAFE): 
Active belt buckle control unit (N2/3)
40
        Model 217: 
Rear control unit (N22/6)
 
478 Electrical fuse 478 (K40/5f478) 30 2.5 RDWH Model 222 with code 223 (Electrically adjustable rear bench seat): 
Left rear seat control unit (N32/6)
30
      2.5 RD Model 217.4 with code 403 (AIRSCARF system): 
AIRSCARF control unit (N25/7)
 
479 Electrical fuse 479 (K40/5f479) 30 4.0 RD Model 222 with code 305 (Rear PRE-SAFE): 
Active belt buckle control unit (N2/3)
40
480 Electrical fuse 480 (K40/5f480) 30 2.5 RDWH Model 222 with code 223 (Electrically adjustable rear bench seat): 
Right rear seat control unit (N32/5)
30
      2.5 RDVT Model 217.4 with code 403 (AIRSCARF system): 
AIRSCARF control unit (N25/7)
 
481 Electrical fuse 481 (K40/5f481) 30g 0.5 RDGN Left front reversible emergency tensioning retractor (A76) 5
482 Electrical fuse 482 (K40/5f482) 30g 0.35 RD Model 222 with code 398 (Panoramic roof with MAGIC SKY CONTROL): 
MAGIC SKY CONTROL, control unit (N53)
5
483 Electrical fuse 483 (K40/5f483) 30g 0.5 RD Right front reversible emergency tensioning retractor (A76/1) 5
484 Electrical fuse 484 (K40/5f484) 30g 0.75 RD Model 222 with code 223 (Electrically adjustable rear bench seat): 
Right rear seat control unit (N32/5)
Left rear seat control unit (N32/6)
7.5
485 Electrical fuse 485 (K40/5f485) 30g 0.75 RD Model 222 with code 305 (Rear PRE-SAFE): 
Active belt buckle control unit (N2/3)
5
486 Electrical fuse 486 (K40/5f486) 15 1.0 PKRD Model 222.004/057/104/157/163: 
Battery management system control unit (N82/2) Power electronics control unit (N129/1)
10
        Model 222.163: 
DC/DC converter control unit (N83/1)
 
487 Electrical fuse 487 (K40/5f487) 15 0.5 PKRD Electric parking brake control unit (N128) 5
488 Electrical fuse 488 (K40/5f488) 15 0.35 BK Rear SAM control unit (N10/8) 5
489 Electrical fuse 489 (K40/5f489) 15 0.75 RDGN With code P20 (Driving Assistance Plus Package): 
Front long-range radar sensor (B29)
5
490 Electrical fuse 490 (K40/5f490) 30g 0.5 RDGN With code 432 (Left and right dynamic multicontour seat), Model 222 with code 406 (Multicontour seats in rear passenger compartment): 
Multicontour seat pneumatic pump (M40)
5
491 Electrical fuse 491 (K40/5f491) 30 4.0 RD Model 217, Model 222 with code 881 (Remote trunk closing): 
Trunk lid control, control unit (N121)
40
492 Electrical fuse 492 (K40/5f492) 30 4.0 RDBK Right front reversible emergency tensioning retractor (A76/1) 40
493 Electrical fuse 493 (K40/5f493) 30 - Spare -
494 Electrical fuse 494 (K40/5f494) 30 4.0 RD Rear SAM control unit (N10/8) 40
495 Electrical fuse 495 (K40/5f495) 30 4.0 RDBU Model 217.3, Model 222: 
Rear window heater (R1)
50
      4.0 BK Model 217.4: 
Rear window heater (R1)
 
496 Electrical fuse 496 (K40/5f496) 30 4.0 RD Left front reversible emergency tensioning retractor (A76) 40
Relay Identification Designation
S Vehicle interior circuit 15 relay (K40/5kS)
T Rear window heater relay (K40/5kT)
U 2nd seat row cup holder and sockets relay (K40/5kU)
V Model 222 with code U42 (BlueTEC (SCR) diesel exhaust treatment): 
AdBlue® relay (K40/5kV)
W Circuit 15R relay (K40/5kW)
X 1st seat row/trunk refrigerator box and sockets relay (K40/5kX)
Y Spare relay (K40/5kY)