TOYOTA SEQUOIA 2001 Service Repair Manual

I28724
EAUAU2AU1
C9
± DIAGNOSTICSNAVIGATION SYSTEM
DI±2289
2483 Author: Date:
2005 SEQUOIA (RM1146U)
2 Inspect steering pad switch assy.
PREPARATION:
Disconnect the steering pad switch assy connector.
CHECK:
Measure the resistance according to the value(s) in the table below.
OK:
Symbol (Tester connection)ConditionSpecified condition
AU1 (C9±12) ± EAU (C9±10)No switch is pushedApprox. 100 kW
AU1 (C9±12) ± EAU (C9±10)SEEK+ switch: pushApprox. 0 W
AU1 (C9±12) ± EAU (C9±10)SEEK± switch: pushApprox. 0.3 kW
AU1 (C9±12) ± EAU (C9±10)VOL+ switch: pushApprox. 1 kW
AU1 (C9±12) ± EAU (C9±10)VOL± switch: pushApprox. 3.2 kW
AU2 (C9±11) ± EAU (C9±10)No switch is pushedApprox. 100 kW
AU2 (C9±11) ± EAU (C9±10)MODE switch: pushApprox. 0 W
NG Replace steering pad switch assy.
OK

I28340
Steering Pad Switch Assy Side:
EAUAU2
AU1
Vehicle Side:
EAUAU2
AU1
C9
DI±2290
± DIAGNOSTICSNAVIGATION SYSTEM
2484 Author: Date:
2005 SEQUOIA (RM1146U)
3 Inspect spiral cable sub±assy.
PREPARATION:
Disconnect the steering pad switch assy and spiral cable sub±
assy connectors.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester connectionSpecified condition
EAU ± EAUBelow 1 W
AU1 ± AU1Below 1 W
AU2 ± AU2Below 1 W
NG Replace spiral cable sub±assy.
OK
Repair or replace harness or connector (Radio and navigation assy ± spiral cable).

I28480
Combination Meter
SPD G±O 25
C53
R29 J17
J/C
BRadio and Navigation Assy
BG±O
± DIAGNOSTICSNAVIGATION SYSTEM
DI±2291
2485 Author: Date:
2005 SEQUOIA (RM1146U)
Speed signal circuit
CIRCUIT DESCRIPTION
The navigation ECU (built in the radio and navigation assy) receives a vehicle speed signal from the com-
bination meter assy and information about the GPS antenna, and then adjusts vehicle position.
HINT:

A voltage of 12 V or 5 V is output from each ECU and then input to the combination meter. The signal
is changed to a pulse signal at the transistor in the combination meter. Each ECU controls the respec-
tive system based on the pulse signal.

If a short occurs in an ECU, all systems in the speed signal circuit will not operate normally.
WIRING DIAGRAM
DIDDP±01

I28748SPD
Wire Harness View:
R29
4.5 to 14 V
0
Turn the wheel Below 2 V
DI±2292
± DIAGNOSTICSNAVIGATION SYSTEM
2486 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check operation of speedometer.
CHECK:
Drive the vehicle and check if the function of the speedometer in the combination meter is normal.
OK:
Actual vehicle speed and the speed indicated on the speedometer and the same.
HINT:
The vehicle speed sensor is functioning normally when the indication on the speedometer is normal.
NG Check combination meter assy
(See page DI±1645).
OK
2 Inspect combination meter assy.
PREPARATION:
Disconnect the radio and navigation assy connector.
CHECK:
(a) Move the shift lever to the neutral position.
(b) Jack up either one of the front wheels.
(c) Turn the ignition switch on.
(d) Measure the voltage between terminal SPD and body
ground of the radio and navigation assy when the front
wheels are turned slowly.
OK:
Voltage is pulses as shown below.
OK Replace radio and navigation assy.
NG

I28748
Radio and Navigation Assy:
SPD
R29
I28569
Combination Meter Assy:
C5±25
± DIAGNOSTICSNAVIGATION SYSTEM
DI±2293
2487 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check harness and connector (Combination meter assy ± Radio and navigation
assy).
PREPARATION:
Disconnect the radio and navigation assy and combination me-
ter assy connectors.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester connectionConditionSpecified condition
SPD (R29±3) ± C5±25Ignition switch OFFBelow 1 W
SPD (R29±3) ±
Body groundIgnition switch OFF10 kW or higher
HINT:
If the resistance between terminal SPD and body ground is less
than 10 kW, there may be a short in a wire harness, connector,
or ECU.
NG Repair or replace harness or connector.
OK
Replace combination meter assy.

I28481
Radio and Navigation Assy
P1
Park/Neutral Position Switch
Instrument Panel J/BREV
IG4J/C
J51 J52
From Ignition
SwitchR29
IPORAD No. 2
1D 1CRB
RL L±R B±Y5 FH
L±R B±Y
L±R7
1
8
6 9
1 2 DI±2294
± DIAGNOSTICSNAVIGATION SYSTEM
2488 Author: Date:
2005 SEQUOIA (RM1146U)
Reverse signal circuit
CIRCUIT DESCRIPTION
The radio and navigation assy receives the reverse signal from the park/neutral position switch and informa-
tion about the GPS antenna, and then adjusts the vehicle position.
WIRING DIAGRAM
DIDDQ±01

I28358
Radio and Navigation Assy:
REV
R29
± DIAGNOSTICSNAVIGATION SYSTEM
DI±2295
2489 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Inspect radio and navigation assy (REV).
PREPARATION:
Disconnect the radio and navigation assy connector.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Symbol
(Tester connection)ConditionSpecified condition
REV (R29±5) ±
Body groundIgnition switch is on.
Shift lever is moved to R
position.
10 to 14 V
REV (R29±5) ±
Body groundIgnition switch is on.
Shift lever is moved to any
position except R.
Below 1 V
OK Replace radio and navigation assy.
NG

I28748
Radio and Navigation Assy:
REV
R29
I28359
Park/Neutral Position Switch
Connector Front View:
P1
DI±2296
± DIAGNOSTICSNAVIGATION SYSTEM
2490 Author: Date:
2005 SEQUOIA (RM1146U)
2 Check harness and connector (Radio and navigation assy ± Park/neutral posi-
tion switch).
PREPARATION:
Disconnect the park/neutral position switch connector.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Symbol
(Tester connection)ConditionSpecified condition
REV (R29±5) ± P1±1AlwaysBelow 1 W
REV (R29±5) ±
Body groundAlways10 kW or higher
NG Repair or replace harness or connector.
OK
Go to back±up light system (See page BE±45).

AC2810
DIDKM±01
AC2811
N11084
Wrong Okay
HI LO HILO
± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±2297
2491 Author: Date:
2005 SEQUOIA (RM1146U)
AIR CONDITIONING SYSTEM
PRECAUTION
1. DO NOT HANDLE REFRIGERANT IN AN ENCLOSED
AREA OR NEAR AN OPEN FLAME
2. ALWAYS WEAR EYE PROTECTION
3. BE CAREFUL NOT TO GET LIQUID REFRIGERANT IN
YOUR EYES OR ON YOUR SKIN
If liquid refrigerant gets in your eyes or on your skin:
(a) wash the area with lots of cool water.
CAUTION:
Do not rub your eyes or skin.
(b) apply clean petroleum jelly to the skin.
(c) go immediately to a hospital or see a physician for profes-
sional treatment.
4. NEVER HEAT CONTAINER OR EXPOSE IT TO NAKED
FLAME
5. BE CAREFUL NOT TO DROP CONTAINER OR APPLY
PHYSICAL SHOCKS TO IT
6. DO NOT OPERATE COMPRESSOR WITHOUT
ENOUGH REFRIGERANT IN REFRIGERATION SYS-
TEM
If there is not enough refrigerant in the refrigerant system, oil lu-
brication will be insufficient and compressor burnout may occur.
Necessary care should be taken to avoid this.
7. DO NOT OPEN HIGH PRESSURE MANIFOLD VALVE
WHILE COMPRESSOR IS OPERATE
Open and close only the low pressure valve. If the high pressure
valves are opened, refrigerant flows in the reverse direction
causing the charging cylinder to rupture.
8. BE CAREFUL NOT TO OVERCHARGE SYSTEM WITH
REFRIGERANT
If refrigerant is overcharged, it causes problems such as insuffi-
cient cooling, poor fuel economy, engine overheating etc.

DI±2298
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2492 Author: Date:
2005 SEQUOIA (RM1146U)
9. SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
The SEQUOIA is equipped with an SRS (Supplemental Re-
straint System) such as the driver, passenger, side, curtain
shield airbag. Failure to carry out service operation in the cor-
rect sequence could cause the SRS to unexpectedly deploy
during servicing, possibly leading to a serious accident. Before
servicing (including removal or installation of parts, inspection
or replacement), be sure to read the precautionary notices tn
the RS section.
10. INITIALIZATION
NOTICE:
When disconnecting the battery terminal, initialize the fol-
lowing system after the terminal is reconnected.
System NameSee Page
Back Door Power Window Control Sys-
temBE±77