2018 Toyota Tundra II Fuse Box Diagram
The 2018 Toyota Tundra (II) has 2 fuse boxes. Choose the one you’re looking at.
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Engine compartment fuse box
On the driver's side of the engine compartment next to the battery, under a lid: push the tab in and lift the lid off. From the 2018 model year the box carries a new assignment (cover sticker 82661-0C320) and the manual prints no fuse table, so the numbers here are the index fuse-box.info and startmycar use for this cover (1-72 over every fuse socket, empty ones included; the three spares are our 75-77) and each description starts with the name printed on the cover. Layout as the cover draws it: four blade fuses at the top, a row of blade fuses across the middle, a row of cartridges (DEFOG, TOW BRK, SUB BATT, IG1 NO.4, IG1 NO.3) below them, the ALT link and the fusible-link block (HTR, LH-J/B, A/PUMP, MAIN) at the lower left, ABS2/ABS1, ST and JB-B beside the lower blade rows, the headlight fuses at the lower right, relays at the top right and along the bottom. Relay housings carry the cover's names where they fit.
| No. | Function | Amp | Description |
|---|---|---|---|
| 1 | 15 AMINI | A/F: air-fuel ratio sensor heaters (fuel injection system) | |
| 2 | 10 AMINI | HORN: horn | |
| 3 | 25 AMINI | EFI NO.1: engine fuel injection system, main supply | |
| 4 | 30 AMINI | IG2 MAIN: ignition-switched IG2 main feed (feeds the INJ, MET and IGN fuses on the earlier editions) | |
| 5 | 25 AMINI | IG1 NO.5: ignition-switched IG1 feed, circuit 5 (name from the cover; Toyota publishes no circuit list) | |
| 6 | Not used | ||
| 7 | 30 AMINI | POWER NO.2: power back window (rear sliding window) | |
| 8 | 15 AMINI | TI&TE: power tilt and telescopic steering column | |
| 9 | 20 AMINI | DEICER: front windshield wiper de-icer | |
| 10 | 30 AMINI | 4WD: four-wheel drive control system | |
| 11 | 30 AMINI | TOW TAIL: trailer tail lights | |
| 12 | Not used | ||
| 13 | Not used | ||
| 14 | 15 AMINI | MIR HTR: outside mirror heaters | |
| 15 | Not used | ||
| 16 | 15 AMINI | FOG FR: front fog lights | |
| 17 | Not used | ||
| 18 | 7.5 AMINI | CARGO LP: cargo bed lamp | |
| 19 | Not used | ||
| 20 | Not used | ||
| 21 | 40 AJCASE | DEFOG: rear window defogger | |
| 22 | 30 AJCASE | TOW BRK: trailer brake controller | |
| 23 | 40 AJCASE | SUB BATT: trailer towing (trailer battery charge feed) | |
| 24 | 40 AJCASE | IG1 NO.4: ignition-switched IG1 feed, circuit 4 (name from the cover; Toyota publishes no circuit list) | |
| 25 | 40 AJCASE | IG1 NO.3: ignition-switched IG1 feed, circuit 3 (name from the cover; Toyota publishes no circuit list) | |
| 26 | 7.5 AMINI | LED DRL: LED daytime running lights | |
| 27 | 15 AMINI | P/OUTLET NO.1: 12 V power outlet No.1 | |
| 28 | Not used | ||
| 29 | Not used | ||
| 30 | 180 AJCASE | ALT: alternator output; feeds the fusible-link block. Replace only with the same rating | |
| 31 | Not used | ||
| 32 | Not used | ||
| 33 | 50 AJCASE | HTR: air conditioning blower | |
| 34 | Not used | ||
| 35 | 150 AJCASE | LH-J/B: main feed of the instrument panel fuse box | |
| 36 | 50 AJCASE | A/PUMP NO.1: secondary air injection pump 1 | |
| 37 | 50 AJCASE | A/PUMP NO.2: secondary air injection pump 2 | |
| 38 | 40 AJCASE | MAIN: headlight main feed (HEAD/LED LL, RL, LH, RH fuses) | |
| 39 | Not used | ||
| 40 | Not used | ||
| 41 | 30 AJCASE | ABS2: anti-lock brakes and vehicle stability control | |
| 42 | 50 AJCASE | ABS1: anti-lock brakes and vehicle stability control | |
| 43 | 5 AMINI | GATEWAY: central gateway ECU (CAN network gateway) | |
| 44 | SHORT PIN: a jumper (short pin), not a fuse - do not fit a fuse here | ||
| 45 | 20 AMINI | ECU-DCC: battery (DCC) feed to control units (name from the cover; Toyota publishes no circuit list) | |
| 46 | 30 AMINI | AMP: audio amplifier | |
| 47 | 7.5 AMINI | TOW BKUP: trailer back-up lights | |
| 48 | Not used | ||
| 49 | Not used | ||
| 50 | Not used | ||
| 51 | 25 AMINI | F/PMP: fuel pump | |
| 52 | 10 AMINI | ETCS: electronic throttle control system | |
| 53 | 5 AMINI | ALT-S: charging system (alternator sense) | |
| 54 | 10 AMINI | AI-HTR: secondary air injection system | |
| 55 | 30 AMINI | TOWING: towing converter (trailer wiring) | |
| 56 | 30 AJCASE | ST: starting system | |
| 57 | 40 AJCASE | JB-B: battery feed to the junction box | |
| 58 | Not used | ||
| 59 | 20 AMINI | WASHER: windshield washer | |
| 60 | 30 AMINI | WIPER: windshield wipers | |
| 61 | 10 AMINI | LED LH: left LED headlight high beam (10 A); printed HEAD LH 15 A on trucks with halogen headlights | |
| 62 | 10 AMINI | LED RH: right LED headlight high beam (10 A); printed HEAD RH 15 A on trucks with halogen headlights | |
| 63 | 10 AMINI | INJ: fuel injection and ignition system | |
| 64 | 10 AMINI | IGN: ignition-switched feed for the SRS airbag system, fuel injection and cruise control | |
| 65 | Not used | ||
| 66 | Not used | ||
| 67 | 10 AMINI | LED LL: left LED headlight low beam (10 A); printed HEAD LL 15 A on trucks with halogen headlights | |
| 68 | 10 AMINI | LED RL: right LED headlight low beam (10 A); printed HEAD RL 15 A on trucks with halogen headlights | |
| 69 | 10 AMINI | EFI NO.2: fuel injection system, evaporative leak detection pump | |
| 70 | 5 AMINI | IDLE/UP: idle-up control (printed IDLE/LP by fuse-box.info) | |
| 71 | Not used | ||
| 72 | Not used | ||
| 75 | 5 AMINI | SPARE: spare 5 A fuse | |
| 76 | 15 AMINI | SPARE: spare 15 A fuse | |
| 77 | 30 AMINI | SPARE: spare 30 A fuse |
Instrument panel fuse box
Under the instrument panel on the driver's side, behind a long narrow cover (sticker 82672-0C100): lie in the footwell and look up; pull the cover off. From the 2018 model year this is a new two-column box and the manual prints no fuse table, so the numbers here are the index fuse-box.info and startmycar use for this cover (1-18 down the cover's left column, 19-36 down its right column) and each description starts with the name printed on the cover. The box is drawn lying on its side: the cover's left column is the upper row here and its right column the lower row, both read left to right from the cover's top end.
| No. | Function | Amp | Description |
|---|---|---|---|
| 1 | Not used | ||
| 2 | 7.5 AMINI | OBD: on-board diagnostics connector | |
| 3 | 10 AMINI | DOME: interior (dome) lights | |
| 4 | Not used | ||
| 5 | 5 AMINI | AM1: starting system (ignition switch AM1 feed) | |
| 6 | 5 AMINI | ECU-DCC NO.2: battery feed to control units, circuit 2 (name from the cover; Toyota publishes no circuit list) | |
| 7 | 5 AMINI | ECU-DCC NO.1: battery feed to control units, circuit 1 (name from the cover; Toyota publishes no circuit list) | |
| 8 | 15 AMINI | RADIO: audio system | |
| 9 | 20 AMINI | DOOR: front door locks and windows (door control) | |
| 10 | 7.5 AMINI | S-HORN: security horn (anti-theft alarm siren) | |
| 11 | Not used | ||
| 12 | Not used | ||
| 13 | 5 AMINI | ECU-ACC: accessory feed to control units | |
| 14 | 10 AMINI | ECU-IG1 NO.3: ignition-switched feed to control units, circuit 3 | |
| 15 | Not used | ||
| 16 | 15 AMINI | A/BAG-IG2: SRS airbag system | |
| 17 | 5 AMINI | METER-IG2: instrument cluster (gauges and meters) | |
| 18 | 5 AMINI | ECU-IG2 NO.3: ignition-switched (IG2) feed to control units, circuit 3 | |
| 19 | 5 AMINI | ECU-B NO.2: battery feed to control units, circuit 2 | |
| 20 | 5 AMINI | ECU-B NO.1: battery feed to control units, circuit 1 | |
| 21 | 25 AMINI | D/L: door lock motors | |
| 22 | 10 AMINI | STOP: stop lights | |
| 23 | 5 AMINI | AM2: starting system (ignition switch AM2 feed); 7.5 A from August 2019 production | |
| 24 | 15 AMINI | HAZ: turn signal and hazard flashers | |
| 25 | 5 AMINI | PANEL: instrument panel illumination | |
| 26 | 10 AMINI | TAIL: tail and parking lights | |
| 27 | 20 AMINI | DOOR R/L: rear left door (lock and window) | |
| 28 | 20 AMINI | DOOR R/R: rear right door (lock and window) | |
| 29 | 15 AMINI | P/OUTLET NO.2: 12 V power outlet No.2 | |
| 30 | 5 AMINI | SFT LOCK-ACC: shift lock control (accessory feed) | |
| 31 | Not used | ||
| 32 | Not used | ||
| 33 | 10 AMINI | ECU-IG1 NO.4: ignition-switched feed to control units, circuit 4 | |
| 34 | 7.5 AMINI | BKUP LP: back-up lights | |
| 35 | 5 AMINI | ECU-IG1 NO.2: ignition-switched feed to control units, circuit 2 | |
| 36 | 5 AMINI | ECU-IG1 NO.1: ignition-switched feed to control units, circuit 1 |