power switch LEXUS LS430 2005 Service Manual

STARTING AND DRIVING
376
Precollision brake assist system
When the precollision sensor detects an object or
vehicle with which your vehicle might collide, and
determines that a collision may be unavoidable,
depressing the brake pedal provides more powerful
braking according to the amount of pedal depression.
The pre−collision brake assist system will operate in the
following conditions:
 When the ignition switch is turned on.
 When the approaching speed in regard to the object or the
vehicle exceeds about 30 km/h (18 mph).
 When the brake pedal is depressed.
If the brake pedal is kept depressed before the sensor’s
determination of unavoidable collision, the pre −collision brake
assist system will operate soon after the sensor’s
determination.
Electronically modulated air suspension
control
When the precollision sensor detects an object or
vehicle with which your vehicle may collide, and
determines that a collision may be unavoidable, the
electronically modulated air suspension adjusts the
damping effect on the shock absorbers and regulates the
vehicle not to pitch forward so much.
The electronically modulated air suspension will operate in the
following conditions:
 When the ignition switch is turned on.
 When the vehicle speed is about 5 km/h (3 mph) or over.
 When the approaching speed in regard to the object or the
vehicle exceeds about 30 km/h (18 mph).

IN CASE OF AN EMERGENCY
400
IF YOUR ENGINE STALLS WHILEDRIVING
If your engine stalls while driving . . .
1. Reduce your speed gradually, keeping a straight line. Move
cautiously off the road to a safe place.
2. Turn on your emergency flashers.
3. Turn the ignition switch to “ACC” or “LOCK”, and try starting
the engine again.
If the engine will not start, see “If your vehicle will not start”\
.
CAUTION
If the engine is not running, the power assist for the
brakes and steering will not work, so steering and
braking will be much harder than usual.
IF YOUR VEHICLE WILL NOT START
(a) Simple checks
Before making these checks, make sure you have followed the
correct starting procedure instructions in “How to start the
engine” on page 304 and that you have sufficient fuel. Since
your vehicle is equipped with the engine immobilizer system,
also check whether the other keys will start the engine. If they
work, your key may be broken. Have the key checked at your
Lexus dealer. If none of your keys work, there may be a
malfunction in the immobilizer system. Call your Lexus dealer.
See “Keys” on page 10.
If the engine is not turning over or is turning over too
slowly
1. Check that the battery terminals are tight and clean.
2. If the battery terminals are O.K., switch on the interior light.
3. If the light is out, dim or goes out when the starter is cranked,
the battery is discharged. You may try jump starting. See “(c)
Jump starting” for further instruction.
If the light is O.K., but the engine still will not start, it needs
adjustment or repair. Call a Lexus dealer, Roadside
Assistance or Customer Service Assistance. (See
“Foreword”.)

IN CASE OF AN EMERGENCY
420
(d) Emergency towing
40L217
If towing is necessary, we recommend you to have it done
by your Lexus dealer or a commercial tow truck service.
If towing service is not available in an emergency, your
vehicle may be temporarily towed by a cable or chain
secured to the emergency towing eyelet. Use extreme
caution when towing the vehicle.
To install the front towing eyelet, see “Installing towing eyelet”
on page 422.
NOTICE
 Only use specified towing eyelet; otherwise your
vehicle may be damaged.
 Never tow a vehicle from the rear with four wheels on
the ground. This may cause serious damage to the
transmission.
A driver must be in the vehicle to steer it and operate the
brakes.
Towing in this manner may be done only on hard −surfaced
roads for a short distance and at low speeds. Also, the wheels,
axles, drive train, steering and brakes must all be in good
condition.
CAUTION
Use extreme caution when towing the vehicle. Avoid
sudden starts or erratic driving maneuvers which would
place excessive stress on the emergency towing eyelet
and towing cable or chain. The eyelet and towing cable
or chain may break and cause serious injury or damage.
NOTICE
Use only a cable or chain specifically intended for use
in towing vehicles. Securely fasten the cable or chain
to the towing eyelet provided.
Before towing, release the parking brake and put the
transmission in “N”. The ignition switch must be in “ACC”
(engine off) or “ON” (engine running).
CAUTION
If the engine is not running, the power assist for the
brakes and steering will not work so steering and
braking will be much harder than usual.

ELECTRICAL COMPONENTS
493
No.FUSEAMPERECIRCUIT
9 PWR
OUTLET15Power outlet
10 DCIG15Rear cigarette lighter
11 OBD7.5On− board diagnosis system
12 AM17.5Starting system
13 ABSIG7.5Vehicle stability control system
14 D B/ANC5Seat belts
15 SECURITY7.5Theft deterrent system
16 A/C7.5Air conditioning system
17 STOP5Stop lights
18 D RRIG10Refreshing seat
19 IG230SRS airbag system, Engine
immobilizer system, Steering
lock system, Starting system
20 HAZ15Emergency flashers
21 STR LOCK7.5Steering lock system
22 AM27.5All components in “STA” and
“IG2”, Starting system
23 MPXB17.5
Power door lock system,
Engine immobilizer system,
Steering lock system, Front
power seat, Rear power seat
24 MPXB37.5
Tilt and telescopic steering,
Headlight switch, Windshield
wiper and washer switch, Turn
signal switch
No.FUSEAMPERECIRCUIT
25 DOME10
Vanity lights, Outer foot lights,
Ignition switch light, Clock,
Gauges and meters, Interior
lights, Personal lights
26 MPXB27.5Gauges and meters, Vehicle
stability control system,
Illuminated entry system, TEL
27 P RRIG10Refreshing seat
28 HLP LVL7.5Headlight leveling system,
Adaptive Front Lighting System
(AFS)
29 PIG7.5Rain sensor, Air conditioning
system, Moon roof,
Multi −information display, Clock
30 P S/HTR15Seat heater, Climate control
seat system
31 PACC7.5
Air conditioning system, Audio
system, Clock,
Multi −information display,
Illuminated entry system
32 PCIG15Front cigarette lighter
33 RADIO
NO.17.5Audio system
34 RR DOOR LH20Power door lock system, Power
window, Door closer system,
Door courtesy lights

ELECTRICAL COMPONENTS
499
BATTERY RECHARGINGPRECAUTIONS
During recharging, the battery is producing hydrogen
gas.
Therefore, before recharging:
1. If recharging with the battery installed on the vehicle, be
sure to disconnect the ground cable.
2. Make sure the power switch on the recharger is off when
connecting the charger cables to the battery and when
disconnecting them.
CAUTION
Always charge the battery in an unconfined area. Do
not charge the battery in a garage or closed room
where there is not sufficient ventilation.
 Only do a slow charge (5 A or less). Charging at a
quicker rate is dangerous. The battery may explode
causing personal injuries.
NOTICE
Never recharge the battery while the engine is running.
Also, make sure all accessories are turned off.
CHECKING AND REPLACING THE BLADE TYPE FUSES
64L087a
Engine compartment 1
Spare fuses 2Pullout tool
64L089a
Engine compartment