Lexus ES300 (2002 year). Manual — part 323
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DIAGNOSTICS
AIR CONDITIONING SYSTEM
05-469
622
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
No air outlet control
1. Air outlet damper position sensor circuit
2. Air outlet control servomotor circuit
3. Heater control housing sub-assy (A/C amplifier)
Engine idle up does not occur, or is continuous
1. Compressor circuit
2. Heater control housing sub-assy (A/C amplifier)
Set temperature value displayed does not much up with operation
of temperature control switch.
1. Heater control housing sub-assy (A/C amplifier)
Brightness does not changes when rheostat volume or light con-
trol switch it turned.
1. Illumination light system
2. Heater control housing sub-assy (A/C amplifier)
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Unable to access the diagnosis mode.
1. Heater control housing sub-assy (A/C amplifier)
DTC not recorded. Set mode is cleared when IG switch is turned
off.
1. Back-up power source circuit
2. Heater control housing sub-assy (A/C amplifier)
Seat heater does not operate.
1. Seat heater circuit
(Driver side)
(Passenger side)
2. Heater control housing sub-assy (A/C amplifier)
I18376
Heater Control Housing Sub-assy
(A/C Amplifier)
SG-5
TR
A15
A15
38
24
LG-B
B
A17
Room Temp. Sensor
1
2
05-470
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DIAGNOSTICS
AIR CONDITIONING SYSTEM
623
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
DTC
11
ROOM TEMPERATURE SENSOR CIRCUIT
CIRCUIT DESCRIPTION
This sensor detects the temperature inside the cabin and sends the appropriate signals to the A/C amplifier.
DTC No.
Detection item
Trouble Area
11
Open or short in room temperature sensor circuit
Room temperature sensor
Harness or connector between room temperature sensor and
A/C amplifier
A/C amplifier
WIRING DIAGRAM
056CL-01
E58224
SG-5
TR
A15
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DIAGNOSTICS
AIR CONDITIONING SYSTEM
05-471
624
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
INSPECTION PROCEDURE
1
INSPECT HEATER CONTROL HOUSING SUB-ASSY(TR, SG-5)
(a)
Remove A/C amplifier with connectors still connected.
(b)
Turn ignition switch ON.
(c)
Measure voltage between terminals TR and SG-5 of A/C
amplifier connector at each temperature.
Voltage:
at 25
C (77
F) : 1.8 - 2.2 V
at 40
C (104
F) : 1.2 - 1.6 V
HINT:
As the temperature increases, the voltage decreases.
A
NG
B
OK
(when checking from the PROBLEM SYMPTOM TABLE)
C
OK (Checking from the DTC)
B
PROCEED TO NEXT CIRCUIT INSPECTION
SHOWN ON PROBLEM SYMPTOM TABLE
C
CHECK AND REPLACE HEATER CONTROL
HOUSING SUB-ASSY
A
I30111
I30156
Resistance (k
Ω
)
Temperature (
C)
05-472
-
DIAGNOSTICS
AIR CONDITIONING SYSTEM
625
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
2
INSPECT COOLER (ROOM TEMP. SENSOR) THERMISTOR
(a)
Remove cooler (room tem. sensor) thermistor.
(b)
Measure resistance between terminals 1 and 2 of cooler
(room temp. sensor) connector at each temperature.
Resistance: 1700
85
Ω
HINT:
As the temperature increases, the resistance decreases.
NG
REPLACE COOLER (ROOM TEMP. SENSOR)
THERMISTOR
OK
3
CHECK HARNESS AND CONNECTOR(BETWEEN COOLER (ROOM TEMP.
SENSOR) THERMISTOR AND HEATER CONTROL HOUSING)
NG
REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
CHECK AND REPLACE HEATER CONTROL HOUSING SUB-ASSY
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