Toyota Sequoia (2005). Manual — part 639
I25201
REC
FRS
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
DI–2351
2545
2
Check air inlet damper position sensor.
PREPARATION:
Remove the air inlet servomotor (See page
).
CHECK:
Measure the resistance between terminals 3 and 2 of the air in-
let servomotor connector.
OK:
Resistance : 4.2 to 7.8 k
Ω
CHECK:
While operating the air inlet servomotor, following the proce-
dure on page
, measure the resistance between termi-
nals 3 and 2 of the air inlet servomotor connector.
OK:
Resistance
Damper Position
Resistance
REC side
3.1 to 5.8 k
Ω
FRS side
0.8 to 1.6 k
Ω
HINT:
As the air inlet servomotor moves from the REC side to the FRS
side, the resistance decreases.
NG
Replace air inlet damper servomotor.
OK
3
Check harness and connectors between air inlet damper position sensor and in-
tegration control and panel (See page
NG
Repair or replace harness or connector.
OK
Replace integration control and panel.
4
(V)
1
TP terminal
voltage
0
100 %
(Cool)
(Hot)
Damper opening angle
I28838
A34 A/C Water Valve (Rear)
3
2
1
W
W
5
L–Y
1
10
18
RrS5
RrSG
RrTP
Integration Control
and Panel
I21
L–R
L–Y
O
IJ3
BH1
L–R
7
L–Y
1
W
A
L–R
IG
J/C
J43
8
6
(Shielded)
6
BH1
BH1
16
w/ Rear A/C:
(Shielded)
O
A
VZ
GND
PT
I21
I21
IJ3
IJ3
IJ3
DI–2352
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
2546
DTC
37
Water Valve Damper Position Sensor Circuit
CIRCUIT DESCRIPTION
This sensor detects the position of the air mix damper and
sends the appropriate signals to the integration control and
panel.
The position sensor is built into the water valve damper control
servomotor assembly.
DTC No.
Detection Item
Trouble Area
37
Short to ground or short to power source circuit in water valve
Water valve damper position sensor
Harness or connector between water valve damper position
37
Short to ground or short to ower source circuit in water valve
damper position sensor circuit.
Harness or connector between water valve dam er osition
sensor and integration control and panel
Integration control and panel
WIRING DIAGRAM
DI3FH–14
I28847
RrSG
RrTP
I21
Integration Control and Panel:
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
DI–2353
2547
INSPECTION PROCEDURE
1
Check voltage between terminals RrTP 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)
Change the set temperature to activate the water valve
servomotor and measure the voltage between terminals
RrTP and RrSG of the integration control and panel con-
nector each time the set temperature is changed.
OK:
Set Temperature
Voltage
Max. cool
3.5 to 4.5 V
Max. hot
0.5 to 1.5 V
HINT:
As the set temperature increases, the voltage decreases.
NG
OK
Proceed to next circuit inspection shown in problem symptoms table (See page
ever, if DTC 37 or 47 is displayed, replace integration control and panel.
I28852
HOT
COOL
4
5
3
2
4
5
2
3
1
1
DI–2354
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
2548
2
Check water valve damper position sensor.
PREPARATION:
Remove the water valve servomotor (See page
CHECK:
Measure the resistance between terminals 1 and 2 of the water
valve servomotor connector.
OK:
Resistance : 4.2 to 7.8 k
Ω
CHECK:
While operating the water valve servomotor, following the pro-
cedure on page
, measure the resistance between ter-
minals 2 and 3 of the water valve servomotor connector.
OK:
Position
Resistance
Max. cool
0.8 to 1.6 k
Ω
Max. hot
3 to 5.6 k
Ω
HINT:
As the water valve servomotor moves from the cool side to the
hot side, the resistance decreases.
NG
Replace water valve servomotor.
OK
3
Check harness and connector between water valve damper position sensor and
integration control and panel (See page
NG
Repair or replace harness or connector.
OK
Replace integration control and panel.
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