Lexus ES300 (2002 year). Service manual - part 78
BODY ELECTRICAL – AIR CONDITIONING
BE-33
187BE33
Indicates a switch operation
OFF
OFF
Turn ignition switch ON with
AUTO and R / F switches held
down.
Indicator Check
Sensor Check
(Continuous Operation)
Sensor Check
(Stepped Operation)
Actuator Check
(Continuous Operation)
Actuator Check
(Stepped Operation)
Cancel Check Mode
(Normal Operation Now Possible)
DEF
DEF
R / F
R / F
AUTO
AUTO
R / F
AUTO
If both AUTO and R / F switches
are not pressed at the same time.
OFF
DEF
OFF
DEF
Self-Diagnosis
The air conditioning ECU has a self-diagnosis function. It stores any operation failures in the air condi-
tioning system memory in the form of a malfunction code. By operating switches on the air conditioning
control switches, the stored malfunction code will be indicated. Since diagnostic results are stored direct-
ly by electric power from the battery, they are not cleared even when the ignition switch is turned off.
Functions
Function
Outline
Indicator Check
Checks indicator lights and temperature setting display.
Sensor Check
Checks the past and present malfunctions of the sensors, and clearing the
past malfunction data.
Actuator Check
Checks against actuator check pattern if blower motor, servomotors and
magnetic clutch are operating correctly according to signals from ECU.
The check function can be started by the following procedure shown below.
For details on the indicator check, sensor check, actuator check function, and clearing DTCs of this system,
refer to the 2002 LEXUS ES300 Repair Manual (Pub. No. RM911U).