TOYOTA SEQUOIA 2001 Service Repair Manual

I28847
GNDI19 Integration Control and Panel:ACC
I22574
Instrument Panel J/B
CIG Fuse
± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±2369
2563 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check voltage between terminals ACC and GND of integration control and panel.
PREPARATION:
Remove the integration control and panel with connectors still
connected.
CHECK:
(a) Turn the ignition switch to ACC.
(b) Measure the voltage between terminals ACC and GND of
the integration 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 CIG fuse.
PREPARATION:
Remove the CIG fuse from the cowl side J/B.
CHECK:
Check continuity of the CIG fuse.
OK:
Continuity
NG Check for short in all the harness and compo-
nents connected to the CIG fuse (See attached
wiring diagram).
OK
Check and repair harness and connector between integration control and panel and battery.

I21123
Integration Control
and Panel
10
3A16
I19SPD G±O 10
3DSub J/B No. 4
G±O 3
C5 Combination Meter DI±2370
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2564 Author: Date:
2005 SEQUOIA (RM1146U)
Vehicle Speed Signal Circuit
CIRCUIT DESCRIPTION
The integration control and panel monitors the vehicle speed through signals sent from the speed sensor.
It uses these signals to receive the ambient temperature sensor signal.
WIRING DIAGRAM
DI3WE±18

± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±2371
2565 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check operation of speedometer.
CHECK:
Check that the speedometer operates normally.
NG Proceed to combination meter troubleshooting
(See page BE±2).
OK
2 Check harness and connector between combination meter and integration con-
trol and panel (See page IN±35).
NG Repair or replace harness or connector.
OK
Replace integration control and panel.

I28848
IGN
I223
Y±G B
23
Combination Meter TACHIntegration Control
and Panel
E5Y±G 1
Y±G
C5 ECM
J17
J/C
B
B J14D
J14F
J15
F DI±2372
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2566 Author: Date:
2005 SEQUOIA (RM1146U)
Igniter Circuit
CIRCUIT DESCRIPTION
The integration control and panel monitors the engine speed through signals sent from the igniter. It uses
these signals and compressor speed signals to detect the compressor lock condition.
WIRING DIAGRAM
DI3WE±19

± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±2373
2567 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check operation of tachometer.
CHECK:
Check that the tachometer operates normally.
NG Proceed to combination meter troubleshooting
(See page BE±2).
OK
2 Check harness and connector between ECM and integration control and panel
(See page IN±35).
NG Repair or replace harness or connector.
OK
3 Check harness and connector between combination meter and integration con-
trol and panel (See page IN±35).
NG Repair or replace harness or connector.
OK
Replace integration control and panel.

Duty Ratio =A + BA
x 100 (%)
ON
OFFA
B
1 cycle
Blower Level
0
Si duty (%)
LO M1M2HI
29.2
42.4 55.5100
M3
70.9
I15873
Integration Control
and Panel
BLW From
Heater Relay
W±B
IGAGND
VM
SI J18
J/C+B
3
4L±B
1
G±B
I19
24 B3
Blower
Motor (Front)
12 L±WL±B
L±B
B4
Blower Motor
Linear Controller DI±2374
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2568 Author: Date:
2005 SEQUOIA (RM1146U)
Blower Motor Circuit (Front A/C)
CIRCUIT DESCRIPTION
The blower motor is operated by signals from the integration
control and panel. Blower motor speed signals are transmitted
by changes in the Duty Ratio.
Duty Ratio
The duty ratio is the ratio of the period of continuity in one cycle.
For example, if A is the period of continuity in one cycle, and B
is the period of non±continuity, then.
WIRING DIAGRAM
DI7SL±08

I07839
21
± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±2375
2569 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check blower motor.
PREPARATION:
Remove the blower motor (See page AC±50).
CHECK:
Connect the positive (+) lead connected to terminal 2 of the
blower motor connector, and the negative (±) lead to terminal
1.
OK:
Blower motor operates smoothly.
NG Replace blower motor.
OK
2 Check harness and connector between battery and blower motor linear control-
ler, blower motor linear controller and body ground (See page IN±35).
NG Repair or replace harness or connector.
OK
3 Check harness and connector between integration control and panel and blower
motor linear controller (See page IN±35).
NG Repair or replace harness or connector.
OK

DI±2376
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2570 Author: Date:
2005 SEQUOIA (RM1146U)
4 Check integration control and panel (See page IN±35).
NG Replace integration control and panel.
OK
Replace blower motor linear controller.

I28844
Integration Control
and Panel
2L16
7
R±WRrBLW
RrVM I21 21
BPBH122
G IJ3 A30
A/C Power Transistor
4LG W±G W±B
5 3
B15
Blower Motor
(Rear)12G W±GL
1 w/ Rear A/C:
From
RR Heater RelayI21 IJ3
W±B
A
J57
J/C
± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±2377
2571 Author: Date:
2005 SEQUOIA (RM1146U)
Blower Motor Circuit (Rear A/C)
CIRCUIT DESCRIPTION
This is power source for the blower motor.
WIRING DIAGRAM
DI8AF±06

I28847
RrBLWI21 Integration Control and Panel:
I24460
DI±2378
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2572 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check voltage between terminal RrBLW of integration control and panel and
body ground.
PREPARATION:
Remove the integration control and panel with connectors still
connected.
CHECK:
(a) Turn the ignition switch to ON.
(b) Operate the blower motor.
(c) Measure the voltage between terminal RrBLW of the in-
tegration control and panel and body ground.
OK:
Voltage: 1 to 3 V
OK Go to step 3.
NG
2 Check blower motor.
PREPARATION:
Remove the blower motor.
CHECK:
Connect the positive (+) lead from the battery to terminal 2 and
the negative (±) lead to terminal 1 of the blower motor connec-
tor.
OK:
Blower motor operates smoothly.
NG Replace blower motor.
OK