2012 Lexus LFA power steering

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2-1. Driving procedures
2
When driving
■Changing the ignition switch positions
“LOCK”
The steering wheel is locked and
the key can be removed.
“A C C ”
Some electrical components such
as the power outlet can be used.
“ON”
All electrical components can be
used.
■Turning the key from “ACC” to “LOCK”
■Default driving mode
AUTO driving mode will be automatically se lected each time the engine is started.
(  P. 1 0 4 )
Push in the key and turn it to the “LOCK”
position.

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2-4. Using other driving systems
Driving assist systems
To help enhance driving safety and performance, the following systems oper-
ate automatically in response to various driving situations. Be aware, however,
that these systems are supplementary and should not be relied upon too
heavily when operating the vehicle.
■ ABS (Anti-lock Brake System)
Helps to prevent wheel lock when the br akes are applied suddenly, or if the
brakes are applied while driving on a slippery road surface.
■ Brake assist
Generates an increased level of braking force after the brake pedal is
depressed when the system de tects a panic stop situation.
■VSC (Vehicle Stability Control)
Helps the driver to control skidding when swerving suddenly or turning on
slippery road surfaces.
■ TRAC (Traction Control)
Helps to maintain drive power and prevent the drive wheels from spinning
when starting the vehicle or accelerating on slippery roads.
■Hill-start assist control
Helps to reduce the vehicle’s rolling backward distance when starting on an
incline or slippery slope.
■EPS (Electric Power Steering)
Employs an electric motor to reduce the amount of effort needed to turn the
steering wheel.
■VDIM (Vehicle Dynamics Integrated Management)
Provides integrated control of the ABS, brake assist, VSC, TRAC, and hill-
start assist control systems.
Helps to maintain vehicle stability when swerving on slippery road surfaces
by controlling the brakes and engine output.
When switched to SPORT driving mode, the control characteristics of the
VDIM system are altered.
■ Active rear wing
 P. 1 7 1

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4-3. Do-it-yourself maintenance
4
Maintenance and care
■Driver’s side instrument panel
FuseAmpereCircuit
1D-P/W 20 A Power window (driver's side)
2D-PWR SEAT 30 A Power seat (driver's side)
3DRLCK ALT 25 A Main body ECU
4RLY SIG 5 A PANEL
5OBD10 A On-board diagnosis
6AM1 5 AD-ACC, P-ACC, CDS FAN, WIP,
WASH, MIR HTR, D-S/HTR, P-S/
HTR, D-IG1-1, D-IG1-2, D-IG1-3, D-
IG1-4, P-IG1-1, P-IG1-2, P-IG1-3, P-
IG1-4, RR-IG1
7D-S/HTR 15 A Seat heater (driver's side)
8D-ACC
5 A Main body ECU
9R/MIR10 A Outside rear view mirrors
10D-IG1-1 5 A CAN gateway ECU
11D-IG1-4 5 A Seat heater (driver's side)
12D-IG1-25 AMain body ECU, rear hatch, EPS
(Electric Power Steering), tire pres-
sure warning system, charging system,
turn signal lights, emergency flashers

5
When trouble arises
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5-1. Essential information
■Emergency towing procedureStart the engine.
If the engine cannot be started, turn the ignition switch to the “ACC” or
“ON” position.
With Neutral selected, release the parking brake.
■When using the towing eyelet
Use the towing eyelet only when your vehicle is being towed.
Do not use the towing eyelet to tow another vehicle or to tie down your vehicle on a
flatbed truck.
CAUTION
■Caution while towing
●Use extreme caution when towing the vehicle.
Avoid sudden starts or erratic driving maneuvers which place excessive stress on
the emergency towing eyelet and the cable or chain. Always be cautious of the
surroundings and other vehicles while towing.
●If the engine is not running , the power assist for the brakes and steering may not
function, making steering and braking more difficult.
■Installing towing eyelet to the vehicle
Make sure that towing eyelet is installed securely.
If not securely installed, towing eyelet may come loose during towing. This may lead
to accidents that cause serious injury or even death.
NOTICE
■To prevent vehicle damage
Observe the following precautions when using a flatbed truck:
●Do not drive over wheel chocks, as doing so may damage the tires.
●Do not tie down the vehicle over any part s other than the tires (do not use parts
such as the suspension).
STEP1
STEP2

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5-2. Steps to take in an emergency
Have the vehicle inspected by your Lexus dealer immediately.
Failing to investigate the cause of the following warnings may lead to the
system operating abnormally and possibly cause an accident. Have the
vehicle inspected by your Lexus dealer immediately.
Warning lightWarning light/Details
(U.S.A.)
(Canada)
Malfunction indicator lamp Indicates a malfunction in:
• The electronic engine control system;
• The electronic throttle control system; or
• The electronic transmission control system.
SRS warning light Indicates a malfunction in:
• The SRS airbag system; or
• The seat belt pretensioner system.
(U.S.A.)
(Canada)
ABS warning light Indicates a malfunction in:
•The ABS; or
• The brake assist system.
Brake system warning light Indicates a malfunction in:
• The electronically controlled brake system; or
• The electric parking brake.
Electric power steering system warning light (warning
buzzer) Indicates a malfunction in the EPS system.
(Comes on) Slip indicator
Indicates a malfunction in:
• The VSC system;
•The TRAC system; or
• The hill-start assist control system.

5
When trouble arises
317
5-2. Steps to take in an emergency
■If the malfunction indicator lamp comes on while driving
First check the following:
●Is the fuel tank empty?
If it is, fill the fuel tank immediately.
●Is the fuel tank cap loose?
If it is, tighten it securely.
The light will go off after taking several driving trips.
If the light does not go off even after several trips, contact your Lexus dealer as soon
as possible.
■Electric power steering system warning light
When the battery is low or when the voltage drops temporarily, the electric power
steering system warnin g light may come on.
■Passenger detection sensor and passenger seat belt reminder
●If luggage is placed on the passenger seat, the 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.
■When the tire pressure warning light comes on
Check the tire inflation pressure and adjust to the appropriate level. Pushing the tire
pressure warning reset switch will not turn off the tire pressure warning light. After
the tire inflation pressure is adjusted, it may take a few minutes for the tire pressure
warning light to go off.
■The tire pressure warning light may come on due to natural causes
The tire pressure warning light may come on due to natural causes such as natural
air leaks or tire inflation pressure changes caused by temperature. In this case,
adjusting the tire inflation pressure will turn off the warning light (after a few min-
utes).

5
When trouble arises
319
5-2. Steps to take in an emergency
CAUTION
■When the electric power steering system warning light comes on
The steering wheel may become extremely heavy.
If the steering wheel becomes heavier than usual when operating, hold firmly and
operate using more force than usual.
■If the tire pressure warning light comes on
Be sure to observe the following precaution s. Failure to do so could cause a loss of
vehicle control and result in death or serious injury.
●Stop your vehicle in a safe place as soon as possible. Adjust the tire inflation pres-
sure immediately.
●If the tire pressure warning light comes on even after tire inflation pressure adjust-
ment, it is probable that you have a flat tire. Check the tires. If a tire is flat, tempo-
rarily repair the tire using the em ergency tire puncture repair kit ( P. 3 3 2 ) a n d
then have the tire repaired or replaced by the nearest Lexus dealer.
●Avoid abrupt maneuvering and braking. If the vehicle tires deteriorate, you could
lose control of the steering wheel or the brakes.
■If a blowout or sudden air leakage should occur
The tire pressure warning system may not activate immediately.

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5-2. Steps to take in an emergency
Check the specified inflation pressure. (P. 366)
Turn the compressor switch “ON”
and fill the tire with air until the
specified inflation pressure is
reached.
Turn the switch “OFF” when the
pressure gauge connected to the
hose reads the specified pressure.
If the inflation pressure is not
attained within 8 minutes, emer-
gency repair is not possible due to
severe damage. Contact your
Lexus dealer.
After completely filling the tire with air, disconnect the hose from
the tire valve and the compress or power plug from the power
outlet.
To spread the liquid sealant ev enly in the tire, immediately drive
for about 3 miles (5 km) or 10 minutes.
Drive cautiously at a moderate speed, avoiding sudden starts, sudden
braking, and abrupt steering maneuvers.
After driving about 3 miles (5 km)
or 10 minutes, stop your vehicle in
a safe place and reconnect the
compressor.
STEP 14
STEP 15
STEP 16
STEP 17
STEP 18
STEP 19