climate control Lexus GS350 2007 Using the interior lights / LEXUS 2007 GS430/350 OWNER'S MANUAL (OM30A04U)

103
2-1. Driving procedures
2
When driving
■Downshifting restrictions in “S” mode
The shift lever cannot be downshifted if the following speeds are exceeded. (The
w
arning buzzer will sound twice in this situation.)
The maximum speeds can get lower when the engine is not warm such as in cold
climates or before warm-up.
■When driving with the cruise control syst em (or dynamic radar cruise control sys-
tem)
The engine brake will not operate in the “S” mode, e
ven when downshifting to “5” or
“4”. ( P. 1 2 4 , 127 )
■Snow mode automatic deactivation
Snow mode is automatically deactivated if the e
ngine switch is turned to “ACC” or
“IG-ON” mode after driving in snow mode.
■If the shift lever cannot be shifted from “P”
 P.
4 8 4
■If the indicator does not come on even after shifting the shift lever to “S”
This may indicate a malfunction in the automatic transmission system. Have the
v
ehicle inspected by your Lexus dealer immediately. 
(In this situation, the vehicle will operate as if the shift lever is in “D”.)
■AI-SHIFT
The AI-SHIFT automatically shifts the gear to
the optimal position according to the
driver's input and driving conditions. 
The AI-SHIFT automatically operates when th e
shift lever is in the D position. (Shift-
ing the shift lever to the S position cancels the function.)
Downshifting
Maximum speed
mph (km/h)
GS430GS350
5 4120 (194)124 (200)
4 388 (142)87 (141)
3 259 (95)56 (91)
2 124 (38)28 (45)

173
2-5. Driving information
2
When driving
■Before driving the vehicle
Perform the following according to the driving conditions.
● D
o not try to forcibly open a w indow or move a wiper that is fro-
zen. Pour warm water over the frozen ar
ea to melt the ice. Wipe
away the water immediately to prevent it from freezing.
● T
o ensure proper operation of the climate control system fan,
remove any snow that has accumulated on the air inlet vents in
front of the windshield.
● R
emove any ice that has accumul ated on the vehicle chassis.
● P
eriodically check for and remove any excess ice or snow that
may have accumulated in the wheel well or on the brakes.
■ When driving the v
ehicle
Accelerate the vehicle slowly and dr iv
e at a reduced speed suitable
to road conditions.
■ When parking the v
ehicle
Park the vehicle and move the shift lever to “P” without setting the
parking br
ake. The parking brake ma y freeze up, preventing it from
being released.

515
6-1. Specifications
6
Vehicle specifications
■Treadwear
The treadwear grade is a comparative r
ating based on the wear rate of
the tire when tested under controll ed conditions on a specified gov-
ernment test course.
For example, a tire graded 150 would wear one and a half (1 - 1 /2) times as
well on the government course as a tire graded 100. 
The relative performance of tires de pends upon the actual conditions of
their
use, however, and may depart significantly from the norm due to varia -
tions in driving habits, service practices
and differences in road characteris-
tics and climate.
■ Traction AA, A, B, C
The traction grades, from highest to lo
west, are AA, A, B and C, and
they represent the tire’s ability to stop on wet pavement as measured
under controlled condit ions on specified government test surfaces of
asphalt and concrete.
A tire marked C may have poor traction performance.
Warning: The traction grade assigned to t
his tire is based on braking
(straight ahead) traction tests and does not include cornering (turning) trac-
tion.
■ Temperature A, B, C
The temperature grades are A (the hi ghest), B
, and C, representing
the tire’s resistance to the generation of heat and its ability to dissipate
heat when tested under controlled conditions on a specified indoor
laboratory test wheel.
Sustained high temperature can cause the material of the tire to degenerate
and reduce tire life, and excessive temperature can lead to sudden tire fail -
ure.
The grade C corresponds to a level of performance which all passenger car
tir
es must meet under the Federal Mo tor Vehicle Safety Standard No. 109.
Grades B and A represent higher levels of performance on the laboratory
test wheel than the minimum r
equired by law.