Toyota Sequoia (2005). Manual — part 634
I28847
RrSG
RrTE
I21
Integration Control and Panel:
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
DI–2331
2525
INSPECTION PROCEDURE
1
Check voltage between terminals RrTE and RrSG of integration control and pan-
el.
PREPARATION:
Remove the integration control and panel with connectors still
connected.
CHECK:
(a)
Turn the ignition switch to ON.
(b)
Measure the voltage between terminals RrTE and RrSG
of the integration control and panel connector at each
temperature.
OK:
Voltage :
at 0
°
C (32
°
F) : 2.0 to 2.4 V
at 15
°
C (59
°
F) : 1.4 to 1.8 V
HINT:
As the temperature increases, the voltage decreases.
NG
OK
Proceed to next circuit inspection shown in problem symptoms table (See page
ever, if DTC 17 is displayed, replace integration control and panel.
N16207
Thermometer
Ice
More than
10 cm (3.94in.)
1
2
I28971
Temperature
Resistance (k
Ω
)
9.0
10.0
8.0
5.0
7.0
4.0
2.0
3.0
0.0
14
32
50
68
86
–10
0
10
20
30
(
F)
(
C)
6.0
1.0
DI–2332
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
2526
2
Check rear evaporator temperature sensor.
PREPARATION:
Remove the rear evaporator temperature sensor (See page
CHECK:
Measure the resistance between terminals 1 and 2 of the evap-
orator temperature sensor connector at each temperature.
OK:
Tester connection
Condition
Specified condition
1–2
–10
C (14
F)
7.40 to 9.20 k
Ω
1–2
–5
C (23
F)
5.65 to 7.00 k
Ω
1–2
0
C (32
F)
4.35 to 5.40 k
Ω
1–2
5
C (41
F)
3.40 to 4.20 k
Ω
1–2
10
C (50
F)
2.68 to 3.30 k
Ω
1–2
15
C (59
F)
2.10 to 2.60 k
Ω
1–2
20
C (68
F)
1.66 to 2.10 k
Ω
1–2
25
C (77
F)
1.32 to 1.66 k
Ω
1–2
30
C (86
F)
1.05 to 1.35 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 rear evaporator temperature sensor.
OK
3
Check harness and connector between rear evaporator temperature sensor and
integration control and panel (See page
NG
Repair or replace harness or connector.
OK
Replace integration control and panel.
I24455
A31
A/C Room Temp.
Sensor (Rear)
2
SG–RrTR
RrTR
Integration Control and Panel
14
13
I22
I22
GR–R
B
1
w/ Rear A/C:
GR–R
R–Y
R–Y
J31
E
J32
F
A
J/C
J31
J32
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
DI–2333
2527
DTC
19
Rear 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
19
Open or short in rear room temperature sensor circuit.
Rear room temp. sensor
Harness or connector between rear room temp. sensor and
integration control and panel
Integration control and panel
WIRING DIAGRAM
DIDKX–01
I28847
RrTR
SG–RrTR
I22
Integration Control and Panel:
DI–2334
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
2528
INSPECTION PROCEDURE
1
Check voltage between terminals RrTR and SG–RrTR of integration control and
panel.
PREPARATION:
Remove the integration control and panel with connectors still
connected.
CHECK:
(a)
Turn the ignition switch to ON.
(b)
Measure the voltage between terminals RrTR and SG–
RrTR 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 DTC19 is displayed, replace integration control and panel.
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