Mercedes-Benz 420SEL (1990 – 1991) – wiring diagrams – fuse box diagram
Year of productions: 1990, 1991
Fuse box diagram
| Relay code | Relay use |
| A | Exterior lamp failture monitoring unit |
| B | Combination relay (turn signal, hazard lamps, wiper/washer) |
| C | High speed relay (auxiliary fan) |
| D | Low speed relay (auxiliary fan) |
| E | Air pump clutch (electronic engine controls/air injection management) |
| F | Headlam Washer Relay (Headlamp Wiper/Washer) |
| G | Power Seat Diode (Power Seats) |
| H | Power Seat Relay |
| I | Power Window Relay (Power Windows) |
| K | Auxiliary Fuse Holder (Anti-theft Alarm system) |
| Fuse | Circuit protected | Connection to circuit | |
| Number | Ampere rating [A] | ||
| 1 | 16 | Auxiliary fan | 30 |
| 2 | 8 | Clock, turn signal/hazard lamps, radio, power seats, warning system, courtesy lamps, diagnostic socket, illumination instrument cluster/center console | 3 |
| 3 | 30 | Rear defogger, wiper, washer turn/hazard lamps | 30 |
| 4 | 8 | Headlamps (Righr Low Beam) | 56b |
| 5 | 8 | Electronic engine controls/air injection management, transmission kick-down, stoplamps/backup lamps, automatic climate control | 15 |
| 6 | 8 | Anti-lock brake system, crusise control, warning indicator, warnirn system, stoplamps/backup lamps, courtesy lamps | 15 |
| 7 | 8 | Horns , rear defogger, turn signal/hazard lamps, warning indicators | 15 |
| 8 | 16 | Outside heated mirrors, seat belt extenders, ani-theft alarm system, rear cigar lighter | 15 |
| 9 | 8 | Lamps: park/tail/marker, license | 58L |
| 10 | 8 | Fog lamps | 58N |
| 11 | 8 | Headlamps wiper/washer, illumination: instrument cluster/center console, Lamps: park/tail/marker/license | 58R |
| 12 | 8 | Headlamps (Left Low Beam) | 56b |
| 13 | 8 | Headlamps (Right High Beam) | 56a |
| 14 | 8 | Headlamps (Left High Beam) | 56a |
| 15 | 8 | Central locking system, anti-theft alarm system, power seats, courtesy lamps, automatic antenna, seat belt extenders, seat backrent locking system | 30 |
| 16 | 25 | Blower control (1), Not used (2) | 15X |
| 17 | 16 | Headlamps/fog lamps, wiper/washer, power windows, power seats, headlamp wiper/washer | 15R |
| 18 | 8 | Radio, front cigar lighter, glove box lamps, wiper/washer (washer jet heaters), rear defogger (3) | 15R |
| 19 | 16 | Sliding roof, orthopedic seats, reated seats | 15R |
| a | 25 | Power seats | 15R/30 |
| b | 25 | Power seats | 15R/30 |
| c | 25 | Power windows | 15R |
| d | 25 | Power windows | 15R |
| (1) – eliminated as of chasis end number 269896
(2) – as of chasis end number 269897 (3) – as of MY 1989 |
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WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.
