2001 TOYOTA SEQUOIA terminal TC

I25201
RECFRS
± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±2351
2545 Author: Date:
2005 SEQUOIA (RM1146U)
2 Check air inlet damper position sensor.
PREPARATION:
Remove the air inlet servomotor (See page AC±49).
CHECK:
Measure the resistance between terminals 3 and 2 of the air in-
let servomotor connector.
OK:
Resistance : 4.2 to 7.8 kW
CHECK:
While operating the air inlet servomotor, following the proce-
dure on page DI±2358, measure the resistance between termi-
nals 3 and 2 of the air inlet servomotor connector.
OK:
Resistance
Damper PositionResistance
REC side3.1 to 5.8 kW
FRS side0.8 to 1.6 kW
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 IN±35).
NG Repair or replace harness or connector.
OK
Replace integration control and panel.

4 (V)
1
TP terminal voltage0 100 %
(Cool)
(Hot)
Damper opening angle
I28838
A34 A/C Water Valve (Rear)
3 2
1
W W
5L±Y1
10
18RrS5
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
J438
6
(Shielded)
6 BH1
BH116 w/ Rear A/C:
(Shielded)
O
A VZ
GND
PTI21
I21 IJ3
IJ3
IJ3 DI±2352
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2546 Author: Date:
2005 SEQUOIA (RM1146U)
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 ItemTrouble Area
37Short to ground or short to power source circuit in water valve

Water valve damper position sensor

Harness or connector between water valve damper position
37Short 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
RrTPI21 Integration Control and Panel:
± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±2353
2547 Author: Date:
2005 SEQUOIA (RM1146U)
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 TemperatureVoltage
Max. cool3.5 to 4.5 V
Max. hot0.5 to 1.5 V
HINT:
As the set temperature increases, the voltage decreases.
NG Go to step 2.
OK
Proceed to next circuit inspection shown in problem symptoms table (See page DI±2304). How-
ever, if DTC 37 or 47 is displayed, replace integration control and panel.

I28852
HOTCOOL
4
532 4
5
2
3
1
1
DI±2354
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2548 Author: Date:
2005 SEQUOIA (RM1146U)
2 Check water valve damper position sensor.
PREPARATION:
Remove the water valve servomotor (See page AC±42).
CHECK:
Measure the resistance between terminals 1 and 2 of the water
valve servomotor connector.
OK:
Resistance : 4.2 to 7.8 kW
CHECK:
While operating the water valve servomotor, following the pro-
cedure on page DI±2361, measure the resistance between ter-
minals 2 and 3 of the water valve servomotor connector.
OK:
PositionResistance
Max. cool0.8 to 1.6 kW
Max. hot3 to 5.6 kW
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 IN±35).
NG Repair or replace harness or connector.
OK
Replace integration control and panel.

I15902
Cool
Warm
± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±2357
2551 Author: Date:
2 Check front air mix damper control servomotor.
PREPARATION:
Remove the front air mix servomotor (See page AC±86).
CHECK:
Connect the positive (+) lead to terminal 1 and the negative (±)
lead to terminal 2.
OK:
The lever turns smoothly to the warm side.
CHECK:
Connect the positive (+) lead to terminal 2 and the negative (±)
lead to terminal 1.
OK:
The lever turns smoothly to the cool side.
NG Replace front air mix servomotor.
OK
3 Check harness and connector between front air mix servomotor and integration
control and panel (See page IN±35).
NG Repair or replace harness or connector.
OK
Replace integration control and panel.

I25201
RECFRS
DI±2360
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2554 Author: Date:
2 Check air inlet damper control servomotor.
PREPARATION:
Remove the air inlet servomotor (See page AC±49).
CHECK:
Connect the positive (+) lead to terminal 4 and the negative (±)
lead to terminal 5.
OK:
The lever moves smoothly to the REC position.
CHECK:
Connect the positive (+) lead to terminal 5 and the negative (±)
lead to terminal 4.
OK:
The lever moves smoothly to the FRS position.
NG Replace air inlet servomotor.
OK
3 Check harness and connector between air inlet servomotor and integration con-
trol and panel (See page IN±35).
NG Repair or replace harness or connector.
OK
Replace integration control and panel.

I28853
5
4
WARM
I28854
COOL54
DI±2362
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2556 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check water valve damper control servomotor.
PREPARATION:
Remove the water valve servomotor (See page AC±42).
CHECK:
Connect the positive (+) lead to terminal 5 and the negative (±)
lead to terminal 4.
OK:
The lever turns smoothly to the warm side.
CHECK:
Connect the positive (+) lead to terminal 4 and the negative (±)
lead to terminal 5.
OK:
The lever turns smoothly to the cool side.
NG Replace water valve servomotor.
OK
2 Check harness and connector between water valve servomotor and integration
control and panel (See page IN±35).
NG Repair or replace harness or connector.
OK
Replace integration control and panel.

I28847
IG+ GNDI19 Integration Control and Panel:
I28847
GNDI19 Integration Control and Panel:
DI±2364
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2558 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check voltage between terminals IG+ and GND of integration control and panel.
PREPARATION:
(a) Remove the integration control and panel with connec-
tors still connected (See page AC±103).
(b) Turn the ignition switch to ON.
CHECK:
Measure the voltage between terminals IG+ and GND of the in-
tegration control and panel.
OK:
Voltage : 10 to 14 V
OK Proceed to next circuit inspection shown in
problem symptoms table (See page DI±2304).
NG
2 Check continuity between terminal GND of integration control and panel and
body ground.
PREPARATION:
Turn the ignition switch to LOCK.
CHECK:
Measure the resistance between terminal GND of the A/C con-
trol assembly and body ground.
OK:
Resistance : Below 1 W
NG Repair or replace harness or connector.
OK