The BMW 1-Series, specifically the F20 (5-door hatchback) and F21 (3-door hatchback), produced between 2012 and 2017, combines dynamic performance with compact luxury. Understanding the fuse box and relay diagrams of these models is crucial for maintaining and troubleshooting their advanced electrical systems. This article explores the locations, functions, and significance of these components, offering insights into the BMW 1-Series F20/F21’s electrical architecture.
(2012-2017) BMW 1-Series (F20/F21) fuse box and relay with Diagram
WARNING
- Never replace a fuse with one that has a higher amperage rating.
- A fuse with a too-high amperage could damage the electrical part and cause a fire.
- On no account should fuses be repaired (e.g. patched up with tin foil or wire) as this may cause serious damage elsewhere in the electrical circuit or cause a fire.
- If a fuse blows repeatedly, do not keep replacing it. Instead, have the cause for the repeated short circuit or overload tracked and fixed.
- Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.
BMW 1-Series (F20/F21) 2012-2017 fuse assignment
Fuse box in the engine compartment
Fuse Box Location
It is located in the right side of the engine compartment (on the left side on the right-hand drive vehicles), under plastic cover.
Fuse box diagram
| No. | Ampere |
| 18 | 15A |
| 19 | 10A |
| 20 | 5A |
| 21 | 5A |
| 22 | 7.5A |
| 23 | 10A |
| 24 | 10A |
| 25 | 5A |
| 26 | 5A |
| 27 | 10A |
| 28 | 5A |
| 29 | 5A |
| 30 | — |
| 31 | 7.5A |
| 32 | 5A |
| 33 | 10A |
| 34 | 10A |
| 35 | — |
| 36 | 40A |
| 37 | 40A |
| 38 | — |
| 39 | — |
| 40 | 15A |
| 41 | 10A |
| 42 | 5A |
| 43 | 15A |
| 44 | 5A |
| 45 | 5A |
| 46 | 5A |
| 47 | 5A |
| 48 | 10A |
| 49 | — |
| 50 | 5A |
| 51 | — |
| 52 | 7.5A |
| 53 | 5A |
| 54 | 7.5A |
| 55 | 5A |
| 56 | 5A |
| 57 | 40A |
| 58 | 30A |
| 59 | — |
| 60 | — |
| 61 | — |
| 62 | 30A |
| 63 | 30A |
| 64 | 20A |
| 65 | 20A |
| 65 | 20A |
| 66 | 20A |
| 67 | 30A |
| 68 | 30A |
| 69 | 20A |
| 70 | 20A |
Assignment of the fuses
Fuse layout may differ! Your exact fuse allocation scheme is located near the fuse box in the luggage compartment.
BDC (Body Domain Controller)
It is located in the front pillar on the passenger side, under the glove box.
Scheme
- 54-pin connector
- 12-pin connector
- 42-pin connector
- 54-pin connector
- Fuses
- Connector (1-pin, positive)
- Relays
- 54-pin connector
- 54-pin connector
- 54-pin connector
Fuses:
- Switching center in the steering column (SZL)
- Control panel for driver assistance systems
- Lighting control panel
- LED headlights
- Rear electronic module (REM)
- Connector OBDII, IHKA
- Electronic block of external door handle
- Window lifter
- Central locking
Relays:
- Electric windows
- Central locking
- Headlight washers
- Starter
- Horn
- Windshield wiper at 1/2 speed
Fuse boxes in the luggage compartment
Fuse Box Location
One unit is located on the right side, behind the sound insulation. The second – in the center, under the lining.
Fuse box diagram
| No. | Ampere |
| 80 | 30A |
| 82 | 20A |
| 83 | 30A |
| 85 | 7.5A |
| 100 | 15A |
| 101 | — |
| 102 | — |
| 103 | 5A |
| 104 | 5A |
| 105 | — |
| 106 | 40A |
| 107 | 40A |
| 108 | — |
| 109 | — |
| 110 | — |
| 111 | — |
| 112 | — |
| 123 | 20A |
| 124 | 20A |
| 115 | — |
| 116 | 30A |
| 117 | 30A |
| 118 | — |
| 119 | — |
| 120 | 5A |
| 121 | 20A |
| 122 | 30A |
| 123 | 40A |
| 124 | 5A |
| 125 | 5A |
| 126 | 10A |
| 127 | 5A |
| 128 | 5A |
| 130 | 5A |
| 131 | — |
| 132 | 5A |
| 133 | — |
| 134 | — |
| 135 | 5A |
| 136 | — |
| 137 | 20A |
| 138 | — |
| 139 | 20A |
| 140 | 20A |
| 141 | 20A |
| 142 | 30A |
| 143 | 5A |
| 144 | 10A |
| 145 | 15A |
| 146 | 5A |
| 147 | 5A |
| 148 | 5A |
| 149 | 7.5A |
| 150 | 5A |
| 151 | 5A |
| 152 | 5A |
| 153 | 5A |
| 154 | 5A |
| 155 | 15A |
| 156 | — |
| 157 | — |
| 158 | — |
| 159 | 5A |
| 160 | 20A |
| 161 | 20A |
| 162 | 20A |
| 163 | 20A |
| 164 | 20A |
| 165 | 20A |
| 166 | — |
Assignment of the fuses
Fuse layout may differ! Your exact fuse allocation scheme is located near the fuse box in the luggage compartment.
Exploring the fuse box and relay diagrams of the BMW 1-Series (F20/F21) 2012-2017 provides a deeper understanding of its intricate electrical infrastructure. Proper maintenance and knowledge of these components are essential for ensuring the vehicle’s reliability, performance, and electrical safety throughout its operational life.