Lexus 2003 LS Owner's Manual page 427

r Operation Requirements
Cruising from about 45 km/h (28 mph) to about 135 km/h (85 mph)
The wipers are not operating at all or operating
intermittently (including the same wiper opera-
tion in the "AUTO" position).
The driving pattern selector switch is set
in the power or normal position.
The automatic transmission selector lever is
in the "D" or "4" position.
Even if these requirements are met, the system may
not operate properly under certain conditions such as
bad weather. See "Owner's Manual" for details.
See Owner's Manual for Complete Information.
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