Mercedes-Benz S420 1994 - FUSES & CIRCUIT BREAKERS Fuses & Circuit Breakers 1994-96 Mercedes-Benz
Mercedes-Benz S420 1994 - IDENTIFICATION FUSE BOX LOCATION
- The Front fuse box (F3) is located in the engine compartment. The fuse specifications are listed on the fuse box lid.
- Maxi fuse box (F2) is is located in the engine compartment.
- The Rear fuse box (F4) is located in the trunk area.
Mercedes-Benz S420 1994 - FUSE BOX IDENTIFICATION
Fig. 1: Mercedes-Benz S420 1994 - Component Locations - Identifying Front Fuse Box - Fuse Location
WARNING: Always disconnect battery ground cable before servicing "high-current fuses. It is recommended that "high-current" fuses be replaced by a qualified technician.
Fuse locations, F3 fuse box (35 fuses, in fuse and relay box F1)
Fuse No. Circuit Fuse ampereage Fuse connections 7 58L 10 (up to MY 1992) Headlamp cleaning system (as of MY 1993) not connected 8 58L 7.5 Left stand lamp
left taillamp
left side-marker lamps 9 58R 7.5 (15) Right standing lamp
right taillamp
right side-marker lamps
license plate illumination
headlamp cleaning system (as of MY 1993) Exterior lamp switch (as of MY 1994 Instrument cluster, cigar light (as of MY 1996) Engine speed increase diode matrix 10 58NS 7.5 Rear fog lamp 11 56b 7.5 Left low beam 12 56b 7.5 Right low beam 13 56a 7.5 Left high beam
high beam indicator lamp 14 56a 7.5 Right high beam
Day time running lights 15 15R 15 SRS MIL
wiper relay
combination relay
Combination switch high beam flasher
Washer pump
Rear window defroster switch (as of 09/1995) Rain sensor
Seat belt comfort feature
Vanity mirrors 16 15R 10 Cigar lighter
Glove box illumination
(as of MY 1994) Starter lock-out relay module 17 30 20 Ignition shut-off relay
Radio (up to 08/1995)
Steering angle sensor
Generic scan tool connector
Data link connector
Diagnostic module (OBD II)
Instrument cluster
Vanity mirror illumination
Turn signal
Hazard flasher switch
Dome lamp 18 30 15 Air conditioning (A/C)
Auxiliary coolant pump control
Relay module 19 15 7.5 Daytime running lights
Spark plugs
Preglow time-limit relay module
Base module
(as of 09/1995) Seat belt warning 20 15 10 A/C pushbutton control module
A/C compressor
Kickdown switch
Purge control valve 21 15x 15 Heated windshield washer nozzles
Power / heated mirrors
Transmission oil cooler
Air conditioning 22 15C 7.5 (up to 08/1995)
Ignition/starter switch
Radio sound system
Seat belt warning module
Seat belt comfort feature
Combination relay
Front heated seats
Rear heated seats (as of 09/1995) not connected 23 15 7.5 Injectors
Instrument cluster
Cruise control switch
Ignition/starter switch
Glow/starter switch
Stop lamp switch
Center high-mounted stop lamp 24 15 7.5 Automatic dimming mirror
Base module
Purge control valve
Instrument cluster
Exterior lamp failure monitoring module
Interior light
Electromagnetic air injection pump clutch (engine 603)
Stop lamp switch
Seat belt warning module
Daytime running lights
Engine control module (HFM-SFI) 25 15 15 Turn signal / hazard warning flasher relay
Fan relay module
Starter lock-out/backup lamp switch
Backup lamp
Shift valve/solenoid valve-automatic transmission 26 58N 10 Fog light 27 - - Not connected 28 30 7.5 Automatic antenna 29 30 15 (20) Front HS control module 30 15R/30 20 Left and right seat memory
Driver memory: Steering column adjustment, Mirror adjustment
Electrical steering column adjustment 31 30 30 Rear power bench seat
Left rear power seat
Rear head restraint 32 30 30 (7.5) Right rear power seat
Rear head restraint ( coupe) 33 - - Not connected 34 15R 7.5 Front HS control module
Rear window defroster
Relay module (Coupe)
Seat belt extender 35 15R (7.5) 15 Rear window sun shade convenience system 36 30 10 A/C push-button control module 37 30 30 Left front power seat 38 30 30 Left front power seat 39 - - Not connected 40 30 30 Right front power seat 41 30 30 Right front power seat
Fig. 2: Mercedes-Benz S420 1994 - Component Locations - Identifying Maxi-Fuse box Component Location
Fuse location, F2 Maxi-fuse box (6 fuses, in fuse and relay box. F1) up to 08/95
Fuse No. Circuit Fuse Ampereage Fused Connections 1 - - Not connected 2 30 30 Auxiliary fan relay 3 - - Not connected 4 30 40 Wiper motor 5 15 40 Pre-fuse rear fuse box, in trunk 6 30 40 Heated rear window (except Coupe) up to MY 1995
Fuse location, F2 Maxi-fuse box (6 fuse, in fuse and relay box F1) up to 09/95
Fuse No. Circuit Fuse Ampereage Fused Connections 1 - - Not connected 2 30 30 Auxiliary fan relay (A/C) Cycle module 3 15R 40 Wiper motor 4 - - Not connected 5 15 40 Pre-fuse rear fuse box, in trunk 6 30 40 AIR pump
Daytime running Lamps
Fig. 3: Mercedes-Benz S420 1994 - Component Locations - Identifying Rear Fuse Box Component Location
Fuse Location, F4 Rear fuse box (17 fuses, in trunk)
Fuse No. Circuit Fuse Ampereage Fused Connections 1 15 15 Rear air conditioning 2 15 7.5 ATA control module
IRCL control module
Starter/lock-out relay module (MY 1993)
Rear HS control module 3 15 20 Rear cigar lighter
Central locking
Closing assist
PSE control module 4 15 7.5 Rear vanity mirror
(up to 1994) 5 30 30 Power windows 6 30 30 Power windows 7 30 7.5 (20) Rear illuminated vanity mirror (up to 08/1995)
Seat belt extender control module (Coupe) 8 15 20 Rear cigar lighter 9 30 30 Closing assist 10 30 7.5 CTEL 11 30 20 Convenience control module power windows
Trunk lamp
Rear dome lamp
Rear reading lamp
Rear entrance / exit lamp
PSE control module
Interior CL switch 12 30 20 Rear HS control module 13 30 30 Fuel pump relay module 14 30 25 Sliding / pop-up roof 15 30 25 ATA control module
IRCL control module
Rear head restraints 16 30 30 Tuner amplifier
Audio power amplifier
Radio 17 30 40 Rear window defroster relay module
Mercedes-Benz S420 1994 - RELAY IDENTIFICATION
Fig. 4: Mercedes-Benz S420 1994 - Component Locations - Identifying Relays In Fuse And Relay Box F1
Location of relays in fuse and relay box F1 (up to 08/95)
Code letter Relay or control module designation A N10, N10/2 Combination relay (turn signals with trailer coupling, heated rear window, wiper motor, anti-theft alarm system (ATA). B N7 Lamp failure monitoring unit C K24 Convenience feature relay D K30 Pump after-running control relay E K9/1 Relay, auxiliary fan first stage F, G K9 Relay, auxiliary fan second stage H K19/1 Separation relay, terminal 56/56b (daytime driving light) K K2 Headlamp wash/wipe system (SRA) relay L K17 Air injection relay K17/3 Key-operated stop relay (model 140.1) M K29 Transmission upshift delay relay
Location of relays in fuse and relay box F1 (as of 09/95)
Code letter Relay or control module designation A N10/2 Combination relay (turn signals with trailer coupling, heated rear window, wiper motor, anti-theft alarm system). N10 Combination relay (turn/hazard signal, heated rear window, wiper motor). B N7 Exterior lamp failure monitoring unit C K24 Convenience feature relay D K20/1 High pressure/return pump relay E K39 Fanfare horn relay F K38/3 Starter lockout relay G - - H K19/1 Separation relay, terminal 56/56b (daytime driving light) K35 Oxygen sensor relay downstream of TWC K K2 Headlamp washer relay (HCS) L K17 Air injection relay K17/3 Air injection relay/transmission, upshift delay M K29 Transmission upshift delay relay