Toyota Sequoia (2005). Manual — part 631
DIDKT–01
I25617
A14
A/C Room Temp.
Sensor (Front)
2
1
R–W
SG–TR
TR
Integration Control and Panel
3
L–W
I20
1
I20
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
DI–2319
2513
CIRCUIT INSPECTION
DTC
11
Front Room Temperature Sensor Circuit
CIRCUIT DESCRIPTION
This sensor detects the temperature inside the cabin and sends the appropriate signals to the integration
control and panel.
DTC No.
Detection Item
Trouble Area
11
Open or short in front room temperature sensor circuit.
Front room temp. sensor
Harness or connector between front room temp. sensor and
integration control and panel
Integration control and panel
WIRING DIAGRAM
I28847
SG–TR
TR
I20
Integration Control and Panel:
DI–2320
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
2514
INSPECTION PROCEDURE
1
Check voltage between terminals TR and SG–TR of integration control and pan-
el.
PREPARATION:
Remove integration control and panel with connectors still con-
nected.
CHECK:
(a)
Turn the ignition switch to ON.
(b)
Measure the voltage between terminals TR and SG–TR
of the integration control and panel connector at each
temperature.
OK:
Voltage :
at 25
°
C (77
°
F) : 1.8 to 2.2 V
at 40
°
C (104
°
F) : 1.2 to 1.6 V
HINT:
As the temperature increases, the voltage decreases.
NG
Go to step 2.
OK
Proceed to next circuit inspection shown in problem symptoms table (See page
ever, if DTC 11 is displayed, replace integration control and panel.
I08310
2
1
I28970
Resistance (k
Ω
)
Temperature
4.0
2.0
3.5
1.5
0.0
10
3.0
1.0
2.5
0.5
20
30
40
50
60
68
86
104
122
140
(
C)
(
F)
50
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
DI–2321
2515
2
Check front room temperature sensor.
PREPARATION:
Disconnect the room temperature sensor connector.
CHECK:
Measure the resistance between terminals 1 and 2 of the room
temperature sensor connector at each temperature.
OK:
Tester connection
Condition
Specified condition
1–2
10
C (50
F)
3.00 to 3.73 k
Ω
1–2
15
C (59
F)
2.45 to 2.88 k
Ω
1–2
20
C (68
F)
1.95 to 2.30 k
Ω
1–2
25
C (77
F)
1.60 to 1.80 k
Ω
1–2
30
C (86
F)
1.28 to 1.47 k
Ω
1–2
35
C (95
F)
1.00 to 1.22 k
Ω
1–2
40
C (104
F)
0.80 to 1.00 k
Ω
1–2
45
C (113
F)
0.65 to 0.85 k
Ω
1–2
50
C (122
F)
0.50 to 0.70 k
Ω
1–2
55
C (131
F)
0.44 to 0.60 k
Ω
1–2
60
C (140
F)
0.36 to 0.50 k
Ω
NOTICE:
Even slightly touching the sensor may change the re-
sistance value. Be sure to hold the connector of the
sensor.
When measuring, the sensor temperature must be
the same as the ambient temperature.
HINT:
As the temperature increases, the resistance decreases (see
the graph on the left).
NG
Replace front room temperature sensor.
OK
3
Check harness and connector between front room temperature sensor and in-
tegration control and panel (See page
NG
Repair or replace harness or connector.
OK
Replace integration control and panel.
I28832
SG–TAM
Integration Control
and Panel
20
12
I19
Y–B
IA5
13
A1
A/C Ambient
Temp. Sensor
Y–B
8
TAM
LG–B
LG–B
1
2
I19
IA5
Y–B
J/C
J14
C
A
J15
DI–2322
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
2516
DTC
12
Ambient Temperature Sensor Circuit
CIRCUIT DESCRIPTION
This sensor detects the ambient temperature and sends the appropriate signals to the integration control
and panel.
DTC No.
Detection Item
Trouble Area
12
Open or short in ambient temperature sensor circuit.
Ambient temp. sensor
Harness or connector between ambient temp. sensor and
integration control and panel
Integration control and panel
WIRING DIAGRAM
DIDKU–01
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