TOYOTA SEQUOIA 2001 Service Repair Manual

± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±2359
2553 Author: Date:
INSPECTION PROCEDURE
1 Actuator check.
PREPARATION:
(a) Remove the glove compartment door to see and check the air inlet damper operation.
(b) Set to the actuator check mode (See page DI±2303).
(c) Press the DEF switch and change it to step operation.
CHECK:
Press the DEF switch and check the operation of the air inlet damper.
OK:
Display CodeAir Inlet Damper
0 ± 2FRS
3REC/FRS
4 ± 9REC
HINT:
However, if DTC 42 is displayed, replace the integration control and panel.
OK Proceed to next circuit inspection shown in
problem symptoms table (See page DI±2304).
NG

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.

I28841
Integration Control
and Panel
5
IJ3
I219
RrAMC
RrAMH L±B
BH13
4
R±G R±G A34
A/C Water Valve (Rear)
R±G L±B
28
10 L±B w/ Rear A/C:
7
M.COOL
M.HOTI21 IJ3 BH1
± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±2361
2555 Author: Date:
2005 SEQUOIA (RM1146U)
DTC 47 Water Valve Damper Control Servomotor
Circuit
CIRCUIT DESCRIPTION
The water valve damper control servomotor is controlled by the integration control and panel and moves the
water valve damper to the desired position.
DTC No.Detection ItemTrouble Area
47
Water valve damper position sensor value does not change
even if integration control and panel operates water valve
damper control servomotor.

Water valve damper control servomotor

Water valve damper position sensor

Harness or connector between water valve damper control
servomotor and integration control and panel

Harness or connector between water valve damper position
sensor and integration control and panel

Integration control and panel
WIRING DIAGRAM
DI936±04

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.

I28842
Integration Control
and Panel
IG+
Battery15 A GAUGE 3A5
3E2
I19 R±L
B±Y
5I18
Ignition Switch
21AM1
1L
W±L IG1
40 A AM11C 1C 1E
BW 8 F10
Fusible Link BlockW±L R±L
4 7 15
R±L
16Instrument Panel J/B Instrument Panel J/B
I1910
GND
140 A ALT
O
J43 J43J/C
A
A
O 2 1 Sub J/B No. 3
± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±2363
2557 Author: Date:
2005 SEQUOIA (RM1146U)
IG Power Source Circuit
CIRCUIT DESCRIPTION
This is the power source for the integration control and panel and servomotors, etc.
WIRING DIAGRAM
DI937±04

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

I15901
GAUGE Fuse Instrument panel J/B
± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±2365
2559 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check GAUGE fuse.
PREPARATION:
Remove the GAUGE fuse from the instrument panel J/B.
CHECK:
Check continuity of the GAUGE fuse.
OK:
Continuity exists.
NG Check for shot in all the harness and compo-
nents connected to the GAUGE fuse (See page
IN±35).
OK
Check and repair harness and connector between integration control and panel and battery.

I24456
Integration Control
and Panel
Engine Room J/B
Battery
F10
Fusible Link
Block Instrument
Panel J/B
10 A DOMESHORT PIN R
1J3A 3E I19
2C2D
BSub J/B No. 3
BB
R581
3
54 16 6
1E
1 RR
+B DI±2366
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2560 Author: Date:
2005 SEQUOIA (RM1146U)
Back±up Power Source Circuit
CIRCUIT DESCRIPTION
This is the back up power source for the integration control and panel. Power is supplied even when the
ignition switch is off and is used for diagnostic trouble code memory, etc.
WIRING DIAGRAM
DI3FL±10

I28847
+B I19 Integration Control and Panel:
I22575
DOME Fuse Engine Room J/B
± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±2367
2561 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check voltage between terminal +B of integration control and panel and body
ground.
PREPARATION:
Remove the integration control and panel with connectors still
connected.
CHECK:
Measure the voltage between terminal +B of the integration
control and panel and body ground.
OK:
Voltage : 10 to 14 V
OK Proceed to next circuit inspection shown in
problem symptoms table (See page DI±2304).
NG
2 Check DOME fuse.
PREPARATION:
Remove the DOME fuse from the engine room J/B.
CHECK:
Check continuity of the DOME fuse.
OK:
Continuity
NG Check for short in all the harness and compo-
nents connected to the DOME fuse (See at-
tached wiring diagram).
OK
Check and repair harness and connector between integration control and panel and battery.

I28843
Integration Control
and Panel
ACC D
15 A CIG I18
Ignition Switch
120 1
40 A AM1
F10
Fusible Link
Block
Battery 2 Instrument Panel J/B3
P
W
B 11L1C
6P
1E AM1
140 A ALT
ACC
5 W±L
1C
8 W±L111
I19 J15
J/C
P Instrument Panel J/B
D
GND 10
I19 O O
J43 J43J/C
A
A
IG
Cowl Side Panel RH
DI±2368
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2562 Author: Date:
2005 SEQUOIA (RM1146U)
ACC Power Source Circuit
CIRCUIT DESCRIPTION
This circuit supplies power to the integration control and panel. It supplies power to the illumination for the
clock.
WIRING DIAGRAM
DI938±04