Lexus RX300 (MCU15). Manual — part 396
DI3FU–02
I08282
A18
Room Temp.
Sensor
1
2
G–W
SG–3
TR
A/C ECU
(Combination meter ECU)
G–R
9
3
C11
C11
DI–814
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
LEXUS RX300 (RM785E)
CIRCUIT INSPECTION
DTC
B1411/11 Room Temperature Sensor Circuit
CIRCUIT DESCRIPTION
This sensor detects the temperature inside the cabin and sends the appropriate signals to the A/C ECU
(Combination meter ECU).
DTC No.
Detection Item
Trouble Area
B1411/11
Open or short in room temperature sensor circuit.
S Room temperature sensor.
S Harness or connector between room temperature sensor and
A/C ECU (Combination meter ECU).
S A/C ECU (Combination meter ECU).
WIRING DIAGRAM
I08329
TR
SG–3
(+)
(–)
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
DI–815
LEXUS RX300 (RM785E)
INSPECTION PROCEDURE
HINT:
In case of using the hard– held tester, start the inspection step 1 and in case of not using the hand–held
tester, start from step 2.
1
Check room temp. sensor using hard– held tester.
PREPARATION:
Connect the hard–held tester to the DLC3.
CHECK:
Check the room temp. sensor using DATA LIST.
OK
Check and replace A/C ECU (Combination me-
ter ECU).
NG
2
Check voltage between terminals TR and SG–3 of A/C ECU (Combination meter
ECU) connector.
PREPARATION:
Remove A/C ECU (Combination meter ECU) with connectors
still connected.
CHECK:
(a)
Turn ignition switch ON.
(b)
Measure voltage between terminals TR and SG–3 of A/C
ECU (Combination meter ECU) connector at each tem-
perature.
OK:
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.
NG
Go to step 3.
OK
Proceed to next circuit inspection shown on problem symptoms table (See page DI–812). Howev-
er, if DTC B1411/11 is displayed, check and replace A/C ECU (Combination meter ECU).
I08330
2
1
DI–816
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
LEXUS RX300 (RM785E)
3
Check room temperature sensor.
PREPARATION:
Disconnect room temperature sensor connector.
CHECK:
Measure resistance between terminals 1 and 2 of room temper-
ature sensor connector at each temperature.
OK:
Resistance :
at 25
°C (77°F) : 1.61 – 1.78 kΩ
at 50
°C (122°F) : 0.55 – 0.65 kΩ
HINT:
As the temperature increases, the resistance decreases.
NG
Replace room temperature sensor.
OK
4
Check harness and connector between A/C ECU (Combination meter ECU) and
room temperature sensor (See page IN–32).
NG
Repair or replace harness or connector.
OK
Check and replace A/C ECU (Combination
meter ECU).
I08331
A1
Ambient
Temp. Sensor
2
1
TAM
A/C ECU
(Combination meter ECU)
C12
7
B–R
IJ1
12
EC1
11
EC1
17
IJ1
13
W–R
W–R
W–R
B–R
B–R
SG–5
16
C12
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
DI–817
LEXUS RX300 (RM785E)
DTC
B1412/12 Ambient Temperature Sensor Circuit
CIRCUIT DESCRIPTION
This sensor detects the ambient temperature and sends the appropriate signals to the A/C ECU (Combina-
tion meter ECU).
DTC No.
Detection Item
Trouble Area
B1412/12
Open or short in ambient temperature sensor circuit.
S Ambient temperature sensor.
S Harness or connector between ambient temperature sensor
and A/C ECU (Combination meter ECU)
S A/C ECU (Combination meter ECU)
WIRING DIAGRAM
DI3FV–03
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