2012 Toyota Tundra II Fuse Box Diagram
The 2012 Toyota Tundra (II) has 2 fuse boxes. Choose the one you’re looking at.
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Engine compartment fuse box
The 2012 manual keeps the 47-position numbering introduced in 2011 but corrects one entry: F/PMP, printed as a 15 A fuse with no circuit in every earlier edition, becomes the 25 A fuel pump fuse. Everything else stands as it was - the box on the driver's side of the engine compartment against the battery, its lid released by a tab, the blade fuses removable with the tool clipped inside, the cartridges treated as dealer parts. Its layout runs four blades across the top, spares at the top right, two blade groups below, the DEFOG and SUB BATT pair in the second row, and the fusible-link block at the lower left.
| 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: feeds the INJ, MET and IGN fuses | |
| 5 | 20 AMINI | DEICER: front windshield wiper de-icer | |
| 6 | 30 AMINI | TOW TAIL: trailer tail lights | |
| 7 | 25 AMINI | POWER NO.4: power windows | |
| 8 | 30 AMINI | POWER NO.2: power back window (rear sliding window) | |
| 9 | 15 AMINI | FOG: front fog lights | |
| 10 | 15 AMINI | STOP: stop lights and high-mounted stop light; also feeds VSC, ABS, the shift lock, the fuel injection system and the towing converter | |
| 11 | 30 AMINI | TOW BRK: trailer brake controller | |
| 12 | 7.5 AMINI | IMB: fuel injection system (engine immobilizer feed) | |
| 13 | 7.5 AMINI | AM2: starting system (ignition switch AM2 feed) | |
| 14 | 30 AMINI | TOWING: towing converter (trailer wiring) | |
| 15 | 10 AMINI | AI PMP HTR (4.0 V6) / AI-HTR (4.6 and 5.7 V8): secondary air injection system | |
| 16 | 5 AMINI | ALT-S: charging system (alternator sense) | |
| 17 | 15 AMINI | TURN-HAZ: turn signal lights, hazard flashers, towing converter | |
| 18 | 25 AMINI | F/PMP: fuel pump (fuel system) | |
| 19 | 10 AMINI | ETCS: electronic throttle control system, fuel injection system | |
| 20 | 5 AMINI | MET-B: gauges and meters (battery feed) | |
| 21 | 30 AMINI | AMP: audio amplifier - audio system, rear view monitor, navigation, rear seat entertainment | |
| 22 | 15 AMINI | RAD NO.1: audio system, rear view monitor, navigation, rear seat entertainment | |
| 23 | 7.5 AMINI | ECU-B1: battery feed for the multiplex (body) network, fuel injection system, auto-dimming mirror, power outlets, driver power seat, tilt and telescopic steering | |
| 24 | 7.5 AMINI | DOME: interior, personal and vanity lights, engine switch light, foot and door courtesy lights, accessory meter | |
| 25 | 15 AMINI | HEAD LH: left headlight high beam | |
| 26 | 15 AMINI | HEAD LL: left headlight low beam | |
| 27 | 10 AMINI | INJ: fuel injection and ignition system | |
| 28 | 7.5 AMINI | MET: gauges and meters | |
| 29 | 10 AMINI | IGN: SRS airbag system, fuel injection system, cruise control | |
| 30 | 15 AMINI | HEAD RH: right headlight high beam | |
| 31 | 15 AMINI | HEAD RL: right headlight low beam | |
| 32 | 10 AMINI | EFI NO.2: fuel injection system, evaporative leak detection pump | |
| 33 | 5 AMINI | DEF I/UP: 5 A fuse fitted, no circuit assigned (Toyota table) | |
| 34 | 5 AMINI | SPARE: spare 5 A fuse | |
| 35 | 15 AMINI | SPARE: spare 15 A fuse | |
| 36 | 30 AMINI | SPARE: spare 30 A fuse | |
| 37 | 40 AJCASE | DEFOG: rear window defogger | |
| 38 | 40 AJCASE | SUB BATT: trailer towing (trailer battery charge feed) | |
| 39 | 50 AJCASE | ABS1: anti-lock brakes and vehicle stability control | |
| 40 | 40 AJCASE | ABS2: anti-lock brakes and vehicle stability control | |
| 41 | 30 AJCASE | ST: starting system | |
| 42 | 50 AJCASE | HTR: air conditioning blower | |
| 43 | 150 AJCASE | LH-J/B: main feed of the instrument panel fuse box (AM1, TAIL, PANEL, ACC, CIG, LH-IG, 4WD, ECU-IG, BK/UP LP, SEAT-HTR, A/C, WSH, WIPER, OBD, seat, mirror, door lock, cargo lamp, outlet and POWER No.1 fuses) | |
| 44 | 140 AJCASE | ALT: alternator output - 180 A with the 5.7 V8 and towing package, 140 A otherwise; feeds LH-J/B, HTR, SUB BATT, TOW BRK, STOP, FOG, TOW TAIL and DEICER. Replace only with the same rating | |
| 45 | 50 AJCASE | A/PUMP NO.1: secondary air injection pump 1 (fuel injection system) | |
| 46 | 50 AJCASE | A/PUMP NO.2: secondary air injection pump 2 (fuel injection system) | |
| 47 | 40 AJCASE | MAIN: feeds the HEAD LL, HEAD RL, HEAD LH and HEAD RH fuses |
Instrument panel fuse box
Toyota's 2012 book prints the same twenty-seven positions here as the 2011 one - the CIG socket still unassigned, POWER No.1 still the closing number - and keeps its changes for the model year under the hood. The box is under the instrument panel on the driver's side, its lid removed from below, with blades in two rows filled from the left and the cartridge sitting in the upper row.
| No. | Function | Amp | Description |
|---|---|---|---|
| 1 | 15 AATO | 115 V AC power outlet (inverter) | |
| 2 | 30 AATO | FR P/SEAT LH: driver's power seat | |
| 3 | 25 AATO | DR/LCK: door locks (multiplex body network) | |
| 4 | 7.5 AATO | OBD: on-board diagnostics connector | |
| 5 | 15 AATO | PWR OUTLET: 12 V power outlets | |
| 6 | 7.5 AATO | CARGO LP: cargo bed lamp | |
| 7 | 7.5 AATO | AM1: shift lock system, starting system | |
| 8 | 7.5 AATO | A/C: air conditioning system | |
| 9 | 15 AATO | MIR: outside mirror control and mirror heaters | |
| 10 | 20 AATO | POWER No.3: power windows | |
| 11 | 30 AATO | FR P/SEAT RH: front passenger power seat | |
| 12 | 15 AATO | TI&TE: power tilt and telescopic steering column | |
| 13 | 25 AATO | S/ROOF: electric moon roof | |
| 14 | 7.5 AATO | ECU-IG No.1: ignition feed for ABS/VSC, body network, parking assist, driver seat, tilt/telescopic column, shift lock, tire pressure warning, accessory meter, trailer towing, power outlet, moon roof | |
| 15 | 7.5 AATO | LH-IG: back-up lights, charging system, gauges, turn signals, air conditioning, seat heaters, rear defogger | |
| 16 | 20 AATO | 4WD: four-wheel drive control system | |
| 17 | 20 AATO | WSH: windshield washer | |
| 18 | 30 AATO | WIPER: windshield wipers and washer | |
| 19 | 7.5 AATO | ECU-IG No.2: multiplex (body) communication system | |
| 20 | 15 AATO | TAIL: tail lights, parking lights, trailer tail lights, outer foot lights | |
| 21 | 10 AATO | A/C IG: air conditioning system (ignition feed) | |
| 22 | 7.5 AATO | TOW BK/UP: trailer back-up lights | |
| 23 | 20 AATO | SEAT-HTR: seat heaters, or heated and ventilated seats | |
| 24 | 7.5 AATO | PANEL: illumination of the instrument panel, glove box, ashtray, accessory meter, audio, navigation, rear seat entertainment, gauges and A/C controls | |
| 25 | 7.5 AATO | ACC: accessory feed for the accessory meter, audio, rear seat entertainment, rear view monitor, navigation, back-up lights, trailer back-up lights, body network, power outlet and outside mirrors | |
| 26 | 10 AATO | BK/UP LP: back-up lights, gauges and meters | |
| 27 | 30 AJCASE | POWER No.1: power windows and power back window |