PJSnow

After getting frustrated with finding the function of each fuse and having little luck on ClubLexus, I figured I'd make a thread that lists all of the fuses. I expect this first post will be updated as user post the use of a fuse and the the scenario for power.

Fuses size - "Low Profile Mini/Micro"
RL - indicates relay

Interior Fuse Box:

ECU-B (10A) -
DOME (15A) -
AM2 (7.5A) -
J/B-B (10A) -
RADIO (15A) - Fuse for radio. Powered when car is off.
OBD (7.5A) -
SHADE RR (7.5A) - (unsure how it's used if the vehicle doesn't have a rear sunshade)
TRUNK OPN (7.5A) -
WIPER SW-IG (5A) -
ECU-IG NO.2 (10A) -
BKUP LP (7.5A) -
ECU-IG NO.1 (10A) - (why are there several ECU fuses?)
J/B-AM (10A) -
P/W (5A) -
FOG RR (10A) -
A/C (7.5A) -

HAZ (15A) -
STRG LOCK (20A) -
ODS (5A) -
CAPACITOR (10A) -
SMART (5A) -
ECU-ACC (7.5A) -
TAIL (15A) - Fuse for tail lights. Only powered when headlights, parking lights, or AUTO lights are on. (great for powering fog lights)
PANEL (7.5A) -
IG I NO.2 (10A) -
IG I NO.1 (10A) -
TI&TE (20A) -
S/ROOF (20A) - Fuse for sunroof. Powered when car is off.
DOOR DBL/L (15A) -
METER (7.5A) -
A/BAG-IG2 (7.5A) -
IGN NO.1 (7.5A) -
IGN NO.2 (7.5A) -

P/SEAT F/L (30A) -
DOOR F/L (30A) -
P/OUTLET NO.1 (15A) - Fuse for 12Volt socket/Cigarette lighter. Powered when car is off. (does no.1 indicate there was intentions of a second socket for the car?)
DOOR R/L (30A) -
AMP NO.2 (30A) -
AMP NO.1 (30A) -
D/L (30A) -
S/HTR F/L (15A) -
S/HTR F/L (15A) -
P/SEAT F/R (30A) -
IG I NO.3 (10A) -
DOOR F/R (30A) -
DOOR R/R (30A) -

PJSnow

Engine Bay Driver's Side Fuse Box:

FUSE PULLER - Don't lose these... the aftermarket pullers suck.
EFI NO.2 (10A) -
EFI-MAIN (25A) -
A/F (15A) -
P INJ (10A) -
IG2 (10A) -
IG2-MAIN (20A) -
H-LP RH-LO (15A) -
H-LP LH-LO (15A) -

FAN (RL) -
S-HORN (RL) -
HORN (RL) -
WIPER (RL) -

STRG HTR (RL) -
INJ (RL) -
INT (RL) -

IG1 MAIN (RL) -
EFI MAIN NO.2 (RL) -
DCM (5A) -
ICS (7.5A) -
STOP (5A) -
HORN (15A) -
S-HORN (10A) -
ETCS (10A) -
INJ ( 20A) -
BBC PA (30A) -

ENG-IG NO.1 (10A) -
AVS (20A) -
EPS-IG (5A) -
WIPER (25A) -
ENG-IG NO.2 (5A) -
ALT-IG (5A) -
RADAR-IG ( 5A) -
WASHER (20A) -
A/C W/PMP (7.5A) -
STRG HTR (15A) -
MIR HTR (15A) -
NOISE FILTER (10A) -
IG1-MAIN (40A) -
H-LP CLN (30A) -
FAN NO.1 (50A) -
FAN (80A) -

PJSnow

Engine Bay Passenger's Side Fuse Box:

ENG-AM (120A) -
J/B LH-AM (120A) -
ALT (150A) -
P/I-B (100A) -
ABS NO.2 (50A) -
ST NO.1 (30A) -
ENG-B (50A) -
FAN NO.2 (RL) -
EPS (RL) -

VGRS (40A) -
EPS-B (5A) -
ALT-S (7.5A) -
FUEL PMP (20A) -
ST NO.2 (20A) -
TOWING (30A) -
D/C CUT (30A) -
BBC NO.1 (40A) -
EPS (80A) -
J/B LH-B (80A) -
BBC NO.2 (40A) -

HTR (50A) -
ABS NO.1 (30A) -
PTC HTR 1 (50A) -
FAN NO.2 (50A) -
PTC HTR 2 (50A) -
P/I-AM (80A) -
MPX-B NO.2 (10A) -
MPX-B NO.1 (10A) -
WIPER-S (5A) -
COMB SW (5A) -
ST NO.1 (RL) -
ST NO.2 (RL) -
MIR HTR (RL) -

PJSnow

Engine Bay Driver's Side Relay Box:

RESERVED

Skramblr42

Thank you for this!

nhandinh

Hi, I did connect the ambient light into car door light and connect the host main power of that into TI&TE(20A). It runs good about few minutes then it downs all. How I can fix that ?

PJSnow

TI&TE has not been defined yet. We have not had many responses to this thread to provide updates on what each fuse is. Only the ones listed with descriptions in my original posts are known.
In regards to fixing your issue, you may want to reach out to a different thread or start a new one. This thread is intended to document all of the 3IS fuses.

nhandinh

do you know which one is the fuse of handle doorlight lexus is 2019?

PJSnow

Unfortunately, I do not. I'm also not sure if the 2019 shares the same fuse boxes or fuse layout as the 2014-2016 IS. If you make any discoveries, please report back and I will update the posts.

davyjordi

does anyone know which fuse is tied to the obdII port?

RussellTeo

really dumb question: where is the interior fuse box for 3IS?
under the steering?

far dumber question:
will dashcam hardwiring void me Lexus warranty is all the fuse got burnt when wrongly install my dashcam?