2001 TOYOTA SEQUOIA O2 sensor

DI±1936
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2130 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check for open and short in wire harness and connector between body ECU and
airbag sensor assembly.
PREPARATION:
Disconnect connector ºA20º of the airbag sensor assembly and connector ºB6º of the body ECU.
CHECK:
Check for an open or short circuit in the harness and connector between the airbag sensor assembly and
body ECU.
OK:
There is no open or short circuit in the wire harness.
NG Repair or replace wire harness or connector.
OK
2 Check the body ECU.
PREPARATION:
Check that DTC B1243 is indicated when another body ECU in good condition is installed.
CHECK:
Check if DTC B1243 is indicated after replacing the body ECU.
OK:
DTCs B1243 is not indicated.
NG Replace the airbag sensor assembly.
OK
Replace the body ECU (Original body ECU is
failure).

I24369
A27
Automatic Light Control
Sensor
B6 12
CLTB CLTS
CLTEBody ECU
R±GY
1 4
34
3
BRB6
B6 CLTB CLTS
CLTE
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±1937
2131 Author: Date:
2005 SEQUOIA (RM1146U)
DTC B1244 Light sensor circuit malfunction
CIRCUIT DESCRIPTION
This DTC is indicated when failure of the light sensor circuit is detected.
DTC No.DTC Detecting ConditionTrouble Area
B1244
Malfunction of automatic light control sensor

Open or short in automatic light control sensor circuit
Automatic light control sensor

Wire harness

Body ECU
WIRING DIAGRAM
DI639±08

DI±1938
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2132 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check automatic light control sensor.
Using hand±held tester:
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch ON and hand±held tester main switch ON.
BODY ECU:
ItemMeasurement Item/Display
(Range)Normal ConditionDiagnostic Note
ILLUMINATE RATEIllumination rate information/
MIN: 0 MAX: 99.99Condition value will be displayedNormal value: 0.8 ms to 22.0 ms
CHECK:
The value of the illumination rate should change in the following range when the light sensor is exposed to
the light or covered by a hand.
OK:
0.8 ms to 22.0 ms
HINT:
This is the time to be taken for the light sensor to generate one cycle of frequency according to the brightness.
When not using hand±held tester (See page BE±27):
NG Replace the automatic light control sensor.
OK

± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±1939
2133 Author: Date:
2005 SEQUOIA (RM1146U)
2 Check wire harness and connector between automatic light control sensor and
body ECU.
PREPARATION:
Disconnect connector ºA27º of the automatic light control sensor and connector ºB6º of the body ECU.
CHECK:
Measure the resistance according to the values in the table below.
OK:
Tester connection (Symbols)ConditionSpecified condition
A27±4 ± B6±12 (CLTS)AlwaysBelow 1 W
A27±1 ± B6±4 (CLTB)AlwaysBelow 1 W
A27±3 ± B6±3 (CLTE)AlwaysBelow 1 W
A27±4 ± Body groundAlways10 kW or higher
A27±1 ± Body groundAlways10 kW or higher
A27±3 ± Body groundAlways10 kW or higher
NG Repair or replace wire harness or connector.
OK
Replace the body ECU.

DI±1966
± DIAGNOSTICSAUDIO SYSTEM
2160 Author: Date:
2005 SEQUOIA (RM1146U)
5. Identify the condition in which the noise occurs, and check the noise filter on the related part.
Condition in which noise occursNoise Source
Depressing the acceleration pedal increases the noise, and stopping the
engine stops the noise immediately.Generator
Noise occurs during A/C or the heater operation.Blower motor
Rapid acceleration while driving on an unpaved road or after the ignition
switch is turned on makes noise.Fuel pump
Pressing and then releasing the horn switch, and keeping pressing the horn
switch makes unusual noise.Horn
Quiet noise is heard while the engine is running, but stops with the engine.Ignition
Noise occurs synchronously with the turn signal flash.Flasher
Noise occurs during window washer operation.Washer
Noise occurs while the engine is running, and it continues even after the en-
gine stops.Engine coolant temperature sensor
Noise occurs during wiper operation.Wiper
Noise occurs when the brake pedal is depressed.Stop light switch
Others.Static electricity stored on the vehicle
Reference:

Make sure first that there is no noise from outside. Failing to do so makes the noise source detec-
tion difficult and leads to misdiagnosis.

The noise should be removed in descending order of loudness.

Tuning the radio so that no station is received wakes the noise more noticeable, making the rec-
ognition of the phenomenon easier.

I28476
R6
Light Control
Rheostat AssyRadio Receiver Assy
J/C
Steering Pad Switch
Spiral Cable
Sub±assy From
TAILLIGHT
RelayILL±
GND J/C
ILL+ W±G
GJ39 J40
J39 J40
J39 J40R4
R19 R4R3
R2 W±G
G
G
G A B
A
AAB
ILL±
T12
5
2
10
6 A±1
A±10C9±1
BR±W C9±10(*1)
*1: Separate Type Amplifier
*2: Built±in Type Amplifier(*2) (*1) (*2)
6
4
± DIAGNOSTICSAUDIO SYSTEM
DI±1999
2193 Author: Date:
2005 SEQUOIA (RM1146U)
Illumination circuit
CIRCUIT DESCRIPTION
Power is supplied to the radio receiver panel illumination when the light control switch is in the TAIL or HEAD
position. The body ECU determines the external brightness based on the brightness level detected by the
automatic light control sensor, and then operates the tail relay. Power can also be supplied by operating the
relay.
The intensity of the radio receiver panel illumination can be adjusted by the rheostat switch.
WIRING DIAGRAM
DID9X±01

± DIAGNOSTICSAUDIO SYSTEM
DI±2027
2221 Author: Date:
2005 SEQUOIA (RM1146U)
Noise occurs
INSPECTION PROCEDURE
1 Check of speaker installation.
CHECK:
Check if each speaker is securely installed.
OK:
Each speaker is securely installed.
HINT:
The radio is equipped with a noise prevention system that blocks excessively loud noise. If such noise oc-
curs, check the all wiring is proper and that the antenna installation part ground and noise±prevention equip-
ment are installed.
Condition in which noise occursNoise type
Noise increases when the accelerator pedal is depressed, but stops when
the engine is stopped.Generator noise
Noise occurs during A/C or the heater operation.Blower motor noise
Noise occurs when the vehicle accelerates rapidly on an unpaved road or
after the ignition switch is turned on.Fuel pump noise
Noise occurs when the horn switch is pressed and released or when pressed
and held.Horn noise
Quiet noise occurs while the engine is running, but stops when the engine is
stopped.Ignition noise
Noise occurs synchronously with the blink of the turn signal.Flasher noise
Noise occurs during window washer operation.Washer noise
Noise occurs while the engine is running, and it continues even after the en-
gine is stopped.Water temperature sensor noise
Noise occurs during wiper operation.Wiper noise
Noise occurs when the brake pedal is depressed.Stop light switch noise
Others.Static electricity stored on the vehicle
HINT:

Identify the condition under which the noise occurs, and check the noise filter on the related part.

First ensure that the noise is not coming from the outside. Failure to do so makes noise source detec-
tion difficult and may lead to a misdiagnosis.

Noise should be removed in descending order of loudness.
NG Install it properly.
OK
Identification of noise source (See page DI±1964).
DIDA3±01

DIDBR±01
I28195
I28196
I28197
DI±2162
± DIAGNOSTICSNAVIGATION SYSTEM
2356 Author: Date:
2005 SEQUOIA (RM1146U)
SYSTEM DESCRIPTION
1. SYSTEM NORMAL CONDITION CHECK
(a) If the symptom is applicable to any of the following, it is intended behavior, and not a malfunction.
SymptomAnswer
A longer route than expected is chosen.Depending on the road conditions, the navigation ECU may determine that a longer
route is quicker.
Even when distance priority is high, the shortest route is not
shown.Some paths may not be advised due to safety concerns.
When the vehicle is put into motion immediately after the
engine starts, the navigation system deviates from the actu-
al position.If the vehicle starts before the navigation system activates, the system may not
react.
When running on certain types of roads, especially new
roads, the vehicle position deviates from the actual position.When the vehicle is driving on new roads not available on the map disc, the system
attempts to match it to another nearby road, causing the position mark to deviate.
(b) The following symptoms are not a malfunction, but are
caused by errors inherent in the GPS, gyro sensor, speed
sensor, and navigation ECU.
(1) The current position mark may be displayed on a
nearby parallel road.
(2) Immediately after a fork in the road, the current ve-
hicle position mark may be displayed on the wrong
road.
(3) When the vehicle turns right or left at an intersec-
tion, the current vehicle position mark may be dis-
played on a nearby parallel road.