ECU LEXUS LX570 2014 Repair Manual

7944-3. Do-it-yourself maintenance
LX570_OM_OM60L21U_(U) 9 WIPER 30 A Windshield wiper
10 WSH 20 A Windshield washer
11 RR WIPER 15 A Rear window wiper and washer
12 4WD 20 A Four-wheel drive system
13 LH-IG 5 A Alternator, towing, seat heater and
ventilators, windshield wiper de-icer,
front seat belt, emergency flasher,
inverter switch, shift lever switch
14 ECU-IG No.1 5 A ABS, VSC, tilt and telescopic steer-
ing, gateway ECU, shift lock system,
parking assist system, cruise control
switch, pre-collision system, headlight
cleaner, multi-display assembly, rain-
sensing windshield wiper, driving posi-
tion memory system, power door lock
system
15 S/ROOF 25 A Moon roof
16 RR DOOR RH 20 A Po w e r w i n d o w s
17 MIR 15 A Mirror ECU, outside rear view mirror
defoggers
18 RR DOOR LH 20 A Po w e r w i n d o w s
19 FR DOOR LH 20 A Po w e r w i n d o w s
20 FR DOOR RH 20 A Po w e r w i n d o w sFuse Ampere Circuit

7954-3. Do-it-yourself maintenance
4
Maintenance and care
LX570_OM_OM60L21U_(U) 21 RR FOG 7. 5 A No circuit
22 A/C 7. 5 A Air conditioning system
23 AM1 5 A No circuit
24 TI & TE 15 A Tilt and telescopic steering
25 FR P/SEAT RH 30 A Po w e r s e a t
26 PWR OUTLET 15 A Po w e r o u t l e t
27 OBD 7. 5 A On Board Diagnostics
28 PSB 30 A Pre-collision system
29 DR/LCK 25 A Main body ECU
30 FR P/SEAT LH 30 A Po w e r s e a t
31 INVERTER 15 A InverterFuse Ampere Circuit

7964-3. Do-it-yourself maintenance
LX570_OM_OM60L21U_(U) ■ Passenger’s side instrument panel
Fuse Ampere Circuit
1 RSF LH 30 A Third seat adjustment (left)
2 B/DR CLSR RH 30 A Back door closer
3 B/DR CLSR LH 30 A Back door closer
4 RSF RH 30 A Third seat adjustment (right)
5 DOOR DL 15 A No circuit
6 AHC-B 20 A 4-Wheel AHC
7 TEL 5 A Multimedia
8 TOW B K / U P 7. 5 A To w i n g
9 AHC-B No.2 10 A 4-Wheel AHC
10 ECU-IG No.4 5 A VGRS, power back door, rear ECU,
4-Wheel AHC, third seat adjustment,
tire pressure warning system ECU

7974-3. Do-it-yourself maintenance
4
Maintenance and care
LX570_OM_OM60L21U_(U) Fuse Ampere Circuit
11 SEAT-A/C FAN 10 A Ventilators
12 SEAT-HTR 20 A Seat heaters
13 AFS 5 A Adaptive Front-lighting System
14 ECU-IG No.3 5 A Adaptive Front-lighting System,
dynamic radar cruise control system
15 STRG HTR 10 A Heated steering wheel
16 TV 10 A Multi-display assembly■
After a fuse is replaced ●
If the lights do not turn on even afte r the fuse has been replaced, a bulb may
need replacement. (  P. 7 9 9 )●
If the replaced fuse blows again, have the vehicle inspected by your Lexus
dealer.■
If there is an overload in the circuits
The fuses are designed to blow, protecting the wiring harness from damage.

8024-3. Do-it-yourself maintenance
LX570_OM_OM60L21U_(U) Replace the light bulb, and install
the bulb base. Align the 3 tabs on the light bulb
with the mounting, and insert.
Turn and secure the bulb base. Shake the bulb base gently to
check that it is not loose, turn the
headlights on once and visually
confirm that no light is leaking
through the mounting.
When installing the cover, conduct in reverse.STEP 4
STEP 5
STEP 6 STEP 1

8084-3. Do-it-yourself maintenance
LX570_OM_OM60L21U_(U) CAUTION■
Replacing light bulbs ●
Turn off the headlights. Do not attempt to replace the bulb immediately after turn-
ing off the headlights.
The bulbs become very hot and may cause burns. ●
Do not touch the glass portion of the li ght bulb with bare hands. When it is
unavoidable to hold the glass portion, use and hold with a clean dry cloth to avoid
getting moisture and oils on the bulb.
Also, if the bulb is scratched or dr opped, it may blow out or crack.●
Fully install light bulbs and any parts used to secure them. Failing to do so may
result in heat damage, fire, or water en tering the headlight unit. This may damage
the headlights or cause condensation to build up on the lens. ●
While the low beam headlights are turned
on, and for a short time after they have
been turned off, metal components at the
rear of the headlight assembly will be
extremely hot.
To prevent burns, do not touch these metal
components until you are certain they have
cooled down.Metal components

8145-1. Essential information
LX570_OM_OM60L21U_(U) Emergency towing
If a tow truck is not available, in an emergency your vehicle may be tem-
porarily towed using a cable or cha in secured to the towing hook. This
should only be attempted on hard, surfaced roads for short distances at
low speeds.
A driver must be in the vehicle to s teer and operate the brakes. The vehi-
cle’s wheels, drive train, axles, steering and brakes must be in good condi-
tion.
Towing hook
■
Emergency towing procedure
The “ENGINE START STOP” switch must be in ACCESSORY mode
(engine off) or IGNITION ON mode (engine running).
Put the four-wheel drive control switch in “H4”. (The center differential is
unlocked.)
Put the vehicle height in the “N” mode and press the height control OFF
switch to turn off the height control. (  P. 3 1 8 )
Put the shift lever in “N”.
Release the parking brake.STEP 1
STEP 2
STEP 3
STEP 4
STEP 5

8265-2. Steps to take in an emergency
LX570_OM_OM60L21U_(U) ■
If the malfunction indicator lamp comes on while driving
First check the following: ●
Is the fuel empty?
If it is, fill the fuel tank immediately. ●
Is the fuel tank cap loose?
If it is, tighten it securely.
The malfunction indicator lamp will go off after taking several driving trips.
If the malfunction indicator lamp does not go off even after several trips, contact
your Lexus dealer as soon as possible. ■
If the low speed four-wheel drive indicator light or the center differential lock
indicator light blinks
Take the specified steps. (  P. 333)
If the brake system warning light or the ma lfunction indicator light also comes on, or
the low speed four-wheel drive indicator light or the center differential lock indica-
tor light continues to blink after taking th e specified steps, there may be a malfunc-
tion in the engine, the brake system or the four-wheel drive system. In this case, you
may not be able to transfer between “H4” and “L4” modes, and the center differen-
tial lock may not be able to be locked or unlocked. Have the vehicle inspected by
your Lexus dealer, immediately. ■
Front passenger detection sensor and passenger seat belt reminder●
If luggage is placed on the front passenger seat, the front passenger detection
sensor may cause the warning light to flash, even if a passenger is not sitting in
the seat. ●
If a cushion is placed on the seat, the sensor may not detect a passenger, and the
warning light may not operate properly.

5
When trouble arises
8455-2. Steps to take in an emergency
LX570_OM_OM60L21U_(U) Once 
(Flashes) •When the doors
were unlocked
with the
mechanical key
and then the
“ENGINE
START STOP”
switch was
pressed, the
electronic key
could not be
detected in the
vehicle.
• The electronic
key could not be
detected in the
vehicle even
after the
“ENGINE
START STOP”
switch was
pressed two
consecutive
times. Touch the elec-
tronic key to the
“ENGINE START
STOP” switch
while depressing
the brake pedal.Interior
buzzer Exterior
buzzerWa r n i n g m e s s a g e Details Correction
procedure

5
When trouble arises
8595-2. Steps to take in an emergency
LX570_OM_OM60L21U_(U) Reinstall the wheel ornament.
Stowing the flat/spare tire, jack and tools
Lay down the tire with the outer
side facing up, an d install the hold-
ing bracket.
Raise the tire.
Stow the tools and jack securely, and replace all covers. STEP 5
STEP 1
■
After completing the tire change
The tire pressure warning system must be reset. (  P. 76 4 )STEP 2
STEP 3