
The load compartment fuse and relay box is installed in the load compartment on the right of the wheelhouse.


| No. | A | Description |
|---|---|---|
| 20 | 5 | →2008: Roof antenna module 2009→: Interference suppression filter for radio antenna 2009→: Microphone array control unit (Japanese version) |
| 21 | 5 | RCP [HBF] control unit |
| 22 | 5 | PTS control unit STH radio remote control receiver |
| 23 | 10 | DVD player Rear audio control unit Portable CTEL separation point (Japanese version) E-net compensator Bluetooth module Universal Portable CTEL Interface (UPCI [UHI]) control unit (Japanese version) |
| 24 | 40 | Right front reversible emergency tensioning retractor |
| 25 | 15 | COMAND operating, display and control unit |
| 26 | 25 | Right front door control unit |
| 27 | 30 | Passenger-side front seat adjustment control unit with memory Front passenger seat adjustment comfort relay |
| 28 | 30 | Driver-side front seat adjustment control unit, with memory Driver seat adjustment comfort relay |
| 29 | 40 | Left front reversible emergency tensioning retractor |
| 30 | 40 | 2009→: Folding rear bench seat control unit M156: Left fuel pump control unit Right fuel pump control unit ML 450 Hybrid: Fuel pump control unit circuit 30 connector sleeve |
| 31 | 10 | HS [SIH], seat ventilation and steering wheel heater control unit |
| 32 | 15 | AIRmatic control unit |
| 33 | 25 | KEYLESS-GO control unit |
| 34 | 25 | Left front door control unit |
| 35 | 30 | Amplifier for sound system 2009→: Subwoofer amplifier |
| 36 | 10 | Emergency call system control unit |
| 37 | 5 | Backup camera power supply module (Japanese version) Backup camera control unit (Japanese version) |
| 38 | 10 | Digital TV tuner →2008: Audio gateway control unit (Japanese version) 2009→: TV combination tuner (analog/digital) (Japanese version) ML 450 Hybrid: High voltage battery module |
| 39 | 7.5 | Tire pressure monitor [RDK] control unit →2008: SDAR control unit (USA version) 2009→: High definition tuner control unit 2009→: Digital Audio Broadcasting control unit 2009→: External navigation separation point (South Korea version) |
| 40 | 40 | →2008: Rear-end door closing control unit |
| 30 | 2009→: Rear-end door closing control unit | |
| 41 | 25 | Overhead control panel control unit |
| 42 | 25 | →2008: SR motor 2009→: Overhead control panel control unit |
| 43 | 20 | 2009→ (M272, M273): Fuel pump control unit →31.05.2006: Tailgate wiper motor 01.06.2006→: Not assigned |
| 44 | 20 | →31.05.2006: Left 2nd seat row socket →31.05.2006: Right 2nd seat row socket 01.06.2006→: Not assigned 2009→: Front interior socket (USA) 2009→: 115V socket |
| 45 | 20 | Cargo area connector box →2008: Front interior socket 2009→: Right 2nd seat row socket |
| 46 | 15 | Front cigar lighter with ashtray illumination |
| 47 | 10 | ML 450 Hybrid: High voltage battery coolant pump 2009→: Left front illuminated door sill molding 2009→: Right front illuminated door sill molding |
| 48 | 5 | 2009→: Rear axle differential lock control unit 2009→ (OM642.820): AdBlue® supply relay 01.07.2009→; ML 450 Hybrid or W164.1 (with M272), W164.8 (with OM642 or M273): Pyrotechnical separator |
| 49 | 30 | Heated rear window |
| 50 | 10 | →31.05.2006: Tailgate wiper motor |
| 15 | 01.06.2006→: Tailgate wiper motor | |
| 51 | 5 | Activated charcoal canister shutoff valve |
| 52 | 5 | →31.05.2009: Left front reversible emergency tensioning retractor →31.05.2009: Right front reversible emergency tensioning retractor 2009→: Rear axle differential lock control unit |
| 53 | 5 | AIRmatic control unit M156: Left fuel pump control unit Right fuel pump control unit M272, M273: Fuel pump control unit 2009→: Transfer case control unit |
| 54 | 5 | Headlamp range adjustment control unit Front SAM control unit |
| 55 | 7.5 | Instrument cluster Rotary light switch |
| 56 | 5 | →31.05.2006: Data link connector OM642.820: AdBlue® control unit ML 450 Hybrid: Fuel pump control unit |
| 57 | 20 | →2008: Fuel pump with fuel gauge sensor except M156: Fuel pump |
| 58 | 7.5 | Datalink connector Central gateway control unit |
| 59 | 7.5 | 2009→: Driver NECK-PRO head restraint solenoid 2009→: Front passenger NECK-PRO head restraint solenoid |
| 60 | 5 | Glove compartment illumination with switch Engine compartment fuse and relay box Rear SAM control unit Cell phone separation point VICS+ETC voltage supply separation point (Japan version) Multicontour seat pneumatic pump (2009→) External navigation separation point (South Korea) Electrical connection, Blind-Spot-Monitoring interior rear bumper (as of 1.8.10) Emergency call system control unit (USA) |
| 61 | 10 | →2008: Restraint systems control unit Right front seat contacting strip |
| 7.5 | 2009→: Restraint systems control unit Right front seat contacting strip | |
| 62 | 30 | Front passenger seat adjustment switch |
| 63 | 30 | Driver lumbar support regulator control unit Front passenger lumbar support regulator control unit Driver seat adjustment switch |
| 64 | - | - |
| 65 | - | - |
| 66 | 30 | 2009→: Multicontour seat pneumatic pump |
| 67 | 25 | Rear air conditioning blower motor |
| 68 | 25 | →2008: Left 2nd row seat heated cushion →2008: Right 2nd row seat heated cushion 2009→: HS [SIH], seat ventilation and steering wheel heater control unit |
| 69 | 30 | 2009→: Rear axle differential lock control unit |
| 70 | 20 | Trailer hitch socket (13-pin) (2009→) Trailer hitch socket (7-pin) |
| 15 | Trailer hitch socket (13-pin) (→2008) | |
| 71 | 30 | Electric brake control separation point |
| 72 | 15 | Trailer hitch socket (13-pin) |
| Relay | ||
| K | →31.05.2006: Terminal 15R power outlet relay, with power-down 01.06.2006→: Circuit 15R seat adjustment 2009→: Relay, circuit 15R sockets (with K power-down) (power supply of electric seat adjustment) | |
| L | Terminal 30X | |
| M | Heated rear window relay | |
| N | Circuit 15 relay / terminal 87FW | |
| O | Fuel pump | |
| P | Rear wiper | |
| R | Circuit R 115R | |
| S | Reserve 1 (changer) (power supply for front socket) | |
| T | 01.06.2006→Circuit 30, socket for 2nd seat row and load compartment 2009→: Reserve 2 (normally open contact) (power supply for center and rear sockets) | |
| U | 01.06.2006→Circuit 30, trailer | |
| V | 01.06.2006→ - | |
Gasoline:
Diesel:


| No. | A | Description |
|---|---|---|
| 100 | 30 | Wiper motor |
| 101 | 15 | AAC with integrated control additional fan motor M156: Terminal 87 M3e connector sleeve M156, M272, M273: Purge control valve M272, M273: Circuit 87 M1e connector sleeve Suction-type fan control unit OM629: CDI control unit Circuit 30 connector sleeve Suction fan control unit ML 450 Hybrid: ME-SFI [ME] control unit Engine compartment/engine connector OM642 (except 642.820): CDI control unit O2 sensor upstream of CAT Suction fan control unit OM642.820: O2 sensor upstream of CAT |
| 102 | 15 | OM642.820 (→31.7.10): Recirculation pump for transmission oil cooler M156: Engine coolant circulation pump |
| 10 | ML 450 Hybrid: Recirculation pump for transmission oil cooler Low temperature coolant pump | |
| 103 | 25 | Circuit 87 M1e connector sleeve CDI control unit →2008; M113, M272, M273: ME-SFI [ME] control unit |
| 20 | ML 450 Hybrid: ME-SFI [ME] control unit M272, M273:ME-SFI [ME] control unit | |
| 104 | 15 | M156, M272, M273: Terminal 87M2e connector sleeve OM629: Terminal 87 connector sleeve OM642.820: Terminal 87 D2 connector sleeve OM642 (except OM642.820): CDI control unit ML 450 Hybrid: Interior and engine wiring harness connector Engine compartment fuse and relay box M113: ME control unit |
| 105 | 15 | M156, M272, M273: ME-SFI [ME] control unit Circuit 87 M1 i connector sleeve OM629: CDI control unit OM642.820: CDI control unit Fuel pump relay OM642 (except 642.820): CDI control unit Fuel pump relay (2009→) Starter (→2008) ML 450 Hybrid: Interior and engine wiring harness connector M113: Circuit 15 connector sleeve, fused |
| 106 | - | Spare |
| 107 | 40 | M156, M272, M273: Electric air pump ML 450 Hybrid: Engine compartment/engine connector |
| 108 | 40 | AIRMATIC compressor unit |
| 109 | 25 | ESP control unit ML 450 Hybrid: Regenerative braking system control unit |
| 110 | 10 | Alarm signal siren |
| 111 | 30 | Intelligent servo module for DIRECT SELECT |
| 112 | 7.5 | Left front lamp unit Right front lamp unit |
| 113 | 15 | Left fanfare horn Right fanfare horn |
| 114 | 5 | →2008: - 2009→: Front SAM control unit OM629: CDI control unit |
| 115 | 5 | ESP control unit ML 450 Hybrid: Regenerative braking system control unit |
| 116 | 7.5 | Electric controller unit (VGS) ML 450 Hybrid: Hybrid vehicle fully integrated transmission control controller unit |
| 117 | 7.5 | DTR controller unit |
| 118 | 5 | M156, M272, M273: ME-SFI [ME] control unit OM629, 642: CDI control unit |
| 119 | 5 | OM642.820: CDI control unit |
| 120 | 10 | M156, M272, M273: ME-SFI [ME] control unit Engine circuit 87 relay M113: ME-SFI [ME] control unit OM629: CDI control unit OM629, OM642: Engine circuit 87 relay |
| 121 | 20 | STH heater unit ML 450 Hybrid: Fuse and relay box 2, engine compartment |
| 122 | 25 | M156, M272, M273, OM629, OM642: Starter M113, M272, M273: ME-SFI [ME] control unit |
| 123 | 20 | OM642: Fuel filter condensation sensor with heating element OM629, OM642 (01.09.2008→): Fuel filter condensation sensor with heating element |
| 124 | 7.5 | W164.120/122/822/825 (01.06.2009→), W164.121/124/125/824: Electrohydraulic power steering ML 450 Hybrid: Electrohydraulic power steering Electric refrigerant compressor control unit |
| 125 | 7.5 | ML 450 Hybrid: Power electronics control unit |
| Relay | ||
| A | Wiper level 1/2 | |
| B | Wiper ON / OFF | |
| C | OM642: Additional circulation pump for transmission oil cooling M156: Engine coolant circulation pump | |
| D | Terminal 87 engine | |
| E | Secondary air injection pump | |
| F | Fanfare horn | |
| G | Air suspension compressor | |
| H | Circuit 15 | |
| I | Starter | |

The battery compartment prefuse box is located next to the power supply battery below the front passenger seat.
| No. | A | Description |
|---|---|---|
| 78 | 100 | →30.06.2009: PTC heater booster |
| 150 | →2008; 01.07.2009→: PTC heater booster | |
| 79 | 60 | Rear SAM control unit |
| 80 | 60 | Rear SAM control unit |
| 81 | 40 | OM642.820: AdBlue® relay supply |
| 150 | 01.07.2009→ (except OM642.820): Engine compartment fuse and relay box W164.195: Vacuum pump relay (+) | |
| 82 | 100 | Load compartment fuse and relay box |
| 83 | 5 | Weight Sensing System (WSS) control unit |
| 84 | 10 | Restraint systems control unit |
| 85 | 25 | 2009→: DC/AC converter control unit (115 V socket) |
| 30 | →2008: Intelligent servo module for DIRECT SELECT | |
| 86 | 30 | Cockpit fuse box |
| 87 | 30 | Transfer case control unit |
| 15 | W164.195: Fuse and relay box 2, engine compartment | |
| 88 | 70 | Front SAM control unit |
| 89 | 70 | Front SAM control unit |
| 90 | 70 | Front SAM control unit |
| 91 | 40 | 2009→: AC air recirculation unit →2008: Blower regulator |

| No. | A | Description |
|---|---|---|
| 4 | - | - |
| 5 | 40 | ML 450 Hybrid: Regenerative braking system control unit |
| 6 | 40 | ESP control unit |
| 80 | ML 450 Hybrid: Electrohydraulic power steering | |
| 7 | 100 | AAC with integrated control additional fan motor |
| 8 | 150 | →2008: Engine compartment fuse and relay box |
| 100 | 2009→: Engine compartment fuse and relay box |


The cockpit fuse box is located in the cockpit on the passenger-side.
| No. | A | Description |
|---|---|---|
| 10 | 10 | Booster blower electronic blower controller |
| 11 | 5 | Instrument cluster |
| 12 | 15 | AAC [KLA] control and operating unit Comfort AAC [KLA] control and operating unit |
| 13 | 5 | Steering column module Upper control panel control unit |
| 14 | 7.5 | EIS [EZS] control unit |
| 15 | 5 | Electronic compass Media interface control unit |
| 16 | - | - |
| 17 | - | - |
| 18 | - | - |

| No. | A | Description |
|---|---|---|
| A | 15 | AdBlue® control unit |
| B | 20 | AdBlue® control unit |
| C | 7.5 | AdBlue® control unit |
| D | - | - |