Lexus ES300 (1997 year). Manual — part 443
Weak
Strong
High
Low
Strength of solar radiation
Resistance o
f
photodiode
I00323
A/C Control Assembly
5 V
S5
TS
A13
L
11
5
A14
J19
J18
C
A
J/C
IG1
9
W
IG1
8
W
L
Solar Sensor
L
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
DI–549
701
1997 LEXUS ES300 (RM511U)
DTC
21
Solar Sensor Circuit
CIRCUIT DESCRIPTION
A photo diode in the solar sensor detects solar radiation and
sends signals to the A/C control assembly.
DTC No.
Detection Item
Trouble Area
21
Open or short in solar sensor circuit.
(Please note that display of DTC 21 is not abnormal when the
sensor is not receiving solar radiation.)
Solar sensor
Harness or connector between solar sensor and A/C control
assembly
A/C control assembly
WIRING DIAGRAM
DI0DC–01
BE3840
I00324
I00336
ON
S5(–)
TS(+)
DI–550
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
702
1997 LEXUS ES300 (RM511U)
INSPECTION PROCEDURE
1
Check voltage between terminals S5 and TS of A/C control assembly connector.
PREPARATION:
(a)
Remove A/C control assembly with connectors still con-
nected (See page
(b)
Turn ignition switch ON.
CHECK:
Measure voltage between terminals S5 and TS of A/C control
assembly connector when the solar sensor is subjected to an
electric light, and when the sensor is covered by a cloth.
OK:
Condition
Voltage
Sensor subjected to electric light
Below 4.0 V
Sensor covered by a cloth
4.0 – 4.5 V
HINT:
As the inspection light is gradually moved away from the sen-
sor, the voltage increases.
NG
Go to step 2
NG
Proceed to next circuit inspection shown on matrix chart (See page
). However, if DTC 21
is displayed, check and replace A/C control assembly.
I00325
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
DI–551
703
1997 LEXUS ES300 (RM511U)
2
Check solar sensor.
PREPARATION:
(a)
Remove instrument panel (See page
).
(b)
Disconnect solar sensor connector.
CHECK:
(a)
Cover the sensor by a cloth.
(b)
Measure resistance between terminals 1 and 2 of solar
sensor connector.
HINT:
Connect positive (+) lead of ohmmeter to terminal 2 and nega-
tive (–) lead to terminal 1 of the solar sensor.
OK:
Resistance:
∞Ω
(No continuity)
PREPARATION:
Remove the cloth from the solar sensor and subject the sensor
to electric light.
CHECK:
Measure resistance.
OK:
Resistance: Below 10 k
Ω
(Continuity)
HINT:
As the electric light is moved gradually away from the sensor,
the resistance increases.
NG
Replace solar sensor.
OK
3
Check harness and connector between A/C control assembly and solar sensor
(See page
).
NG
Repair or replace harness or connector.
OK
Check and replace A/C control assembly.
I00326
A/C Control Assembly
LOCK
SG
A/C Compressor
Lock Sensor
W–L
W–L
W–R
3
1
A13
J20
J20
E
E
J/C
IM2
10
IM2
9
A13
W–R
W–R
DI–552
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
704
1997 LEXUS ES300 (RM511U)
DTC
22
Compressor Lock Sensor Circuit
CIRCUIT DESCRIPTION
This sensor sends 4 pulses par engine revolution to the A/C control assembly. If the number ratio of the com-
pressor speed divided by the engine speed is smaller than a predetermined value, the A/C control assembly
turns the compressor off. And, the indicator flashes at about 1 second intervals.
DTC No.
Detection Item
Trouble Area
22
All conditions below are detected for 3 secs. or more.
(a) Engine speed: 450 rpm or more
(b) Ratio between engine and compressor speed deviates
20 % or more in comparison to normal operation.
Compressor
Compressor drive belt
Compressor lock sensor
Harness and connector between compressor and A/C control
assembly
A/C control assembly
WIRING DIAGRAM
INSPECTION PROCEDURE
1
Check compressor.
PREPARATION:
(a)
Check compressor drive belt tension (See page
).
(b)
Check if the compressor does not lock during operation with engine started and blower switch and A/C
switch ON.
NG
Adjust drive belt tension or repair compressor.
OK
DI0DD–01
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