2003 Toyota Tundra I Fuse Box Diagram

The 2003 Toyota Tundra (I) has 3 fuse boxes. Choose the one you’re looking at.

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Engine compartment fuse box, 2UZ-FE V8

In the engine compartment on the driver's (left) side behind the battery: unclip and lift the cover. Numbered by Toyota from 1; the horizontal MINI fuses stand in two columns, the twelve in the middle on end, with the cartridge fuses (type B) at the top and the alternator fusible link (type C) in the centre. The relays are unlabelled on the plate.

No.	Amp	Description
1	15 AMINI	MIR HTR - outside rear view mirror heaters
2	15 AMINI	FOG - front fog lights
3	30 AMINI	TOW BRK - trailer brake controller (towing package)
4	30 AMINI	SUB BATT - trailer sub battery charging (towing package)
5	30 AMINI	TOW TAIL - trailer tail lights
6	15 AMINI	PWR OUTLET 1 - power outlet
7	5 AMINI	ECU-B - anti-lock brake system
8	10 AMINI	H-LP RH - right headlight high beam
9	15 AMINI	PWR OUTLET 2 - power outlet
10	10 AMINI	DOME - interior light, personal lights, vanity light, ignition switch light, step light, door courtesy lights, open-door warning light
11	10 AMINI	H-LP LH - left headlight high beam
12	10 AMINI	EFI NO.2 - fuel injection and emission control
13	20 AMINI	RADIO - audio system
14	10 AMINI	HEAD RL - right headlight low beam (with daytime running lights)
15	10 AMINI	A/C - air conditioning system
16	10 AMINI	HEAD LL - left headlight low beam (with daytime running lights)
17	7.5 AMINI	ALT-S - charging system (alternator sense)
18	10 AMINI	ETCS - electronic throttle control and fuel injection (2UZ-FE V8; the V6 uses fuse 23 in this socket)
19	15 AMINI	HAZ - emergency flashers
20	20 AMINI	EFI NO.1 - fuel injection, fuel pump; also feeds the EFI NO.2 fuse
21	30 AMINI	AM2 - ignition and starting systems; feeds the IGN and STA fuses
22	30 AMINI	TOWING - towing converter
37	40 AJCASE	AM1 - starting system; feeds the ACC, WIP, 4WD, ECU-IG, GAUGE and TURN fuses (cartridge fuse)
38	50 AJCASE	HTR - air conditioning and heater blower; feeds the A/C fuse (cartridge fuse)
39	50 AJCASE	J/B - junction block supply: feeds the POWER, CARGO LP, TAIL, OBD, HORN and STOP fuses (cartridge fuse)
40	40 AJCASE	ABS 2 - anti-lock brake system (cartridge fuse)
41	30 AJCASE	ABS 3 - anti-lock brake system (cartridge fuse)
42	30 AJCASE	ST3 - starting system; feeds the STA fuse (cartridge fuse, 2UZ-FE V8 only)
44	100 AJCASE	FL ALT - alternator fusible link (cartridge type C): 100 A without / 140 A with the towing package; feeds AM1, HTR, J/B, MIR HTR, FOG, TOW BRK, SUB BATT, TOW TAIL and the PWR OUTLET fuses

Engine compartment fuse box, 5VZ-FE V6

No.	Amp	Description
1	15 AMINI	MIR HTR - outside rear view mirror heaters
2	15 AMINI	FOG - front fog lights
5	30 AMINI	TOW TAIL - trailer tail lights
6	15 AMINI	PWR OUTLET 1 - power outlet
7	5 AMINI	ECU-B - anti-lock brake system
8	10 AMINI	H-LP RH - right headlight high beam
9	15 AMINI	PWR OUTLET 2 - power outlet
10	10 AMINI	DOME - interior light, personal lights, vanity light, ignition switch light, step light, door courtesy lights, open-door warning light
11	10 AMINI	H-LP LH - left headlight high beam
12	10 AMINI	EFI NO.2 - fuel injection and emission control
13	20 AMINI	RADIO - audio system
14	10 AMINI	HEAD RL - right headlight low beam (with daytime running lights)
15	10 AMINI	A/C - air conditioning system
16	10 AMINI	HEAD LL - left headlight low beam (with daytime running lights)
17	7.5 AMINI	ALT-S - charging system (alternator sense)
19	15 AMINI	HAZ - emergency flashers
20	20 AMINI	EFI NO.1 - fuel injection, fuel pump; also feeds the EFI NO.2 fuse
21	30 AMINI	AM2 - ignition and starting systems; feeds the IGN and STA fuses
22	30 AMINI	TOWING - towing converter
23	15 AMINI	ETCS - electronic throttle control and fuel injection (5VZ-FE V6; the V8 uses fuse 18 in this socket)
37	40 AJCASE	AM1 - starting system; feeds the ACC, WIP, 4WD, ECU-IG, GAUGE and TURN fuses (cartridge fuse)
38	50 AJCASE	HTR - air conditioning and heater blower; feeds the A/C fuse (cartridge fuse)
39	50 AJCASE	J/B - junction block supply: feeds the POWER, CARGO LP, TAIL, OBD, HORN and STOP fuses (cartridge fuse)
40	40 AJCASE	ABS 2 - anti-lock brake system (cartridge fuse)
41	30 AJCASE	ABS 3 - anti-lock brake system (cartridge fuse)
44	100 AJCASE	FL ALT - alternator fusible link (cartridge type C): 100 A without / 140 A with the towing package; feeds AM1, HTR, J/B, MIR HTR, FOG, TOW BRK, SUB BATT, TOW TAIL and the PWR OUTLET fuses

Instrument panel fuse box

Under the instrument panel on the driver's side, left of the steering column: pull the cover off the opening to reach the block. Three columns of MINI blade fuses with the POWER cartridge fuse above them; numbering continues from the engine compartment box.

No.	Amp	Description
24	20 AMINI	WIP - windshield wipers and washer
25	5 AMINI	TURN - turn signal lights
26	5 AMINI	ECU IG - anti-lock brake system and cruise control
27	20 AMINI	4WD - four-wheel drive control and A.D.D. (automatic disconnecting differential) control
28	15 AMINI	ACC - cigarette lighter, audio system, SRS airbag system, power mirrors; feeds the PWR OUTLET 1 and 2 fuses
29	10 AMINI	GAUGE - gauges and meters, back-up lights, starting system, air conditioning
30	5 AMINI	IGN - SRS airbag system, fuel injection, discharge warning light and ignition system
31	5 AMINI	CARGO LP - cargo lamp
32	15 AMINI	TAIL - tail lights, license plate lights, instrument panel lights, parking lights, glove box light
33	7.5 AMINI	OBD - on-board diagnosis connector
34	10 AMINI	HORN - horns
35	5 AMINI	STA - fuel injection system, gauges and meters (starter signal)
36	15 AMINI	STOP - stop lights and high-mounted stop light
43	30 AJCASE	POWER - power door locks, power windows and power seat (cartridge fuse)