2001 TOYOTA SEQUOIA radio antenna

B04770
IN±18
± INTRODUCTIONFOR ALL OF VEHICLES
18 Author: Date:
2005 SEQUOIA (RM1146U)
(4) Check that the VSC TRAC warning light blinks.
(5) After the measurement, remove the SST and re-
start the engine. At this time, make sure that the
VSC TRAC warning light is off.
(b) Notice in VSC operation.
(1) Removal and reinstallation of VSC±related compo-
nents may cause misadjustment of them. Do not re-
move or reinstall them unless necessary.
(2) When conducting VSC±related operations, do not
fail to make sure that the preparation and the finish-
ing of the operation are all performed in accordance
with the direction in this text.
3. FOR VEHICLES EQUIPPED WITH A CATALYTIC CONVERTER
CAUTION:
If a large amount of unburned gasoline flows into the converter, it may overheat and create a fire haz-
ard. To prevent this, observe the following precautions and explain them to your customer.
(a) Use only unleaded gasoline.
(b) Avoid prolonged idling.
Avoid running the engine at idle speed for more than 20 minutes.
(c) Avoid spark jump test.
(1) Perform spark jump test only when absolutely necessary. Perform this test as rapidly as possible.
(2) While testing, never race the engine.
(d) Avoid prolonged engine compression measurement.
Engine compression tests must be done as rapidly as possible.
(e) Do not run engine when fuel tank is nearly empty.
This may cause the engine to misfire and create an extra load on the converter.
(f) Avoid coasting with ignition turned off.
(g) Do not dispose of used catalyst along with parts contaminated with gasoline or oil.
4. IF VEHICLE IS EQUIPPED WITH MOBILE COMMUNICATION SYSTEM
For vehicles with mobile communication systems such as two±way radios and cellular telephones, observe
the following precautions.
(1) Install the antenna as far as possible away from the ECU and sensors of the vehicle's electronic
system.
(2) Install the antenna feeder at least 20 cm (7.87 in.) away from the ECU and sensors of the ve-
hicle's electronic systems. For details about ECU and sensor locations, refer to the section on
the applicable component.
(3) Do not wind the antenna feeder together with the other wiring as much as possible, also avoid
running the antenna feeder parallel with other wire harness.
(4) Check that the antenna and feeder are correctly adjusted.
(5) Do not install powerful mobile communication system.

DID9K±01
I27726
Radio Receiver Assy
Rear Door Speaker Tweeter
Rear Door Speaker Front Door Speaker (*1)
Front Door Speaker and
Woofer (*2)Steering Pad
Switch
Instrument Panel J/B

RAD NO. 2 Fuse

ECU±B Fuse

AM1 FuseEngine Room J/B

RAD NO. 1 Fuse

RAD NO. 3 Fuse
Ignition Switch
Disc Player
Controller
(*3)
Stereo
Component
AmplifierMulti±display
Controller (*3)
VTR
Terminal
(*3)Headphone
Terminal
(*3, *4)
Television Display Assy (*3)
Rear Seat Audio
Controller Assy (*4)
Radio Sub
Antenna*1: Built±in Type Amplifier
*2: Separate Type Amplifier
*3: w/ RSE System
*4: w/ RSA System Radio Main Antenna
DI±1956
± DIAGNOSTICSAUDIO SYSTEM
2150 Author: Date:
2005 SEQUOIA (RM1146U)
LOCATION

DID9P±01
30 kHz 300 kHz 3 MHz 30 MHz 300 MHz
LF MF HF VHF
AM FM
Frequency modulation Frequency
Designation
Radio wave
Modulation Amplitude modulation
BE2818
FM (Stereo)
FM (Monaural)
AM
BE2819
Ionosphere Phasing DI±1964
± DIAGNOSTICSAUDIO SYSTEM
2158 Author: Date:
2005 SEQUOIA (RM1146U)
IDENTIFICATION OF NOISE SOURCE
1. RADIO WAVE BAND
The radio wave bands used in radio broadcasting are as follows:
LF: Low Frequency
MF: Medium Frequency
HF: High Frequency
VHF: Very High Frequency
2. SERVICE AREA
There is a great difference in the size of the service areas for
AM and FM broadcasting. Sometimes an FM stereo broadcast
cannot be received even though AM can be received very clear-
ly.
FM stereo has the smaller service area, it also picks up static
and other types of interference (ºnoiseº) easily.
3. RECEPTION PROBLEMS
HINT:
Besides the problem of static, there are other problems, such as ºphasingº, ºmultipathº and ºfade outº. These
problems are caused not by electrical noise but by the nature of the radio waves themselves.
(a) Phasing
Besides electrical interference, AM broadcasts are also
susceptible to other types of interference, especially at
night. This is because AM radio waves bounce off the ion-
osphere at night. These radio waves then interfere with
the signals that reach the vehicle's antenna directly from
the same transmitter. This type of interference is called
ºphasingº.

DID9R±01
I28312
R4R19R20
± DIAGNOSTICSAUDIO SYSTEM
DI±1969
2163 Author: Date:
2005 SEQUOIA (RM1146U)
TERMINALS OF ECU
1. RADIO RECEIVER ASSY (SEPARATE TYPE AMPLIFIER)
Symbols (Terminal No.)Wiring ColorTerminal DescriptionConditionSpecification
BU+B (R4±1) ± GND (R4±20)L±Y ± BRBatteryAlways10 to 14 V
ILL+ (R4±2) ± GND (R4±20)G ± BRIllumination (dimmer)
signalLight control switch OFF " TAIL or
HEADBelow 1 V "
10 to 14 V
TX+ (R4±5) ± GND (R4±20)V ± BRAVC±LAN
communication signalIgnition switch ON2 to 3 V
MUTE (R4±7) ± GND (R4±20)R±W ± BRMUTE signalAudio system is playing "changing
modeAbove 3.5 V "
Below 1 V
R+ (R4±8) ± GND (R4±20)W ± BRSound signal
(Right output)Audio system is playing
A waveform synchro-
nized with sounds is
output
L+ (R4±9) ± GND (R4±20)B ± BRSound signal
(Left output)Audio system is playing
A waveform synchro-
nized with sounds is
output
GND (R4±10) ± Body groundShielded ±
Body groundShield groundAlwaysBelow 1 V
ACC+B (R4±11) ±
GND (R4±20)GR ± BRAccessory (ON)Turn ignition switch to OFF "ACC10 to 14 V
ILL± (R4±12) ± GND (R4±20)W±G ± BRIllumination (rheostat)
signalLight control switch TAILBelow 1 V "
10 to 14 V
ANT+B (R4±13) ±
GND (R4±20)B±R ± BRPower source of antennaRadio switch ON and AM or FM10 to 14 V
TX± (R4±15) ± GND (R4±20)P ± BRAVC±LAN
communication signalIgnition switch ON2 to 3 V
R± (R4±18) ± GND (R4±20)G ± BRSound signal
(Right output)Audio system is playing
A waveform synchro-
nized with sounds is
output
L± (R4±19) ± GND (R4±20)R ± BRSound signal
(Left output)Audio system is playing
A waveform synchro-
nized with sounds is
output
GND (R4±20) ± Body groundBR ±
Body groundGroundAlwaysBelow 1 V
GND (R19±6) ± GND (R4±20)BR±W ± BRSteering pad switch
groundAlwaysBelow 1 V
SW1 (R19±7) ± GND (R4±20)LG±R ± BRSteering pad switch signal
Steering pad switch not operating.
"SEEK+ switch push
"SEEK± switch push
"VOL+ switch push
"VOL± switch push4 V or more
"Approx. 0.5 V
"Approx. 0.9 V
"Approx. 2.0 V
"Approx. 3.4 V
SW2 (R19±8) ± GND (R4±20)GR±R ± BRSteering pad switch signalSteering pad switch not operating
"MODE switch push4 V or more "
Below 2.5 V

I28313
R2R3R19
± DIAGNOSTICSAUDIO SYSTEM
DI±1971
2165 Author: Date:
2005 SEQUOIA (RM1146U)
*1: w/ Rear seat entertainment system
*2: w/ Rear seat audio system
2. RADIO RECEIVER ASSY (BUILT±IN TYPE AMPLIFIER)
Symbols (Terminal No.)Wiring ColorTerminal DescriptionConditionSpecification
FR+ (R2±1) ± GND (R2±7)LG ± BRSound signal (Front Right)Audio system is playing
A waveform synchro-
nized with sounds is
output
FL+ (R2±2) ± GND (R2±7)P ± BRSound signal (Front Left)Audio system is playing
A waveform synchro-
nized with sounds is
output
ACC+B (R2±3) ± GND (R2±7)GR ± BRAccessory (ON)Turn ignition switch to OFF " ACCBelow 1 V "
10 to 14 V
BU+B (R2±4) ± GND (R2±7)L±Y ± BRBatteryAlways10 to 14 V
FR± (R2±5) ± GND (R2±7)L ± BRSound signal (Front Right)Audio system is playing
A waveform synchro-
nized with sounds is
output
FL± (R2±6) ± GND (R2±7)V ± BRSound signal (Front Left)Audio system is playing
A waveform synchro-
nized with sounds is
output
GND (R2±7) ± Body groundBR ±
Body groundGroundAlwaysBelow 1 V
ANT+B (R2±8) ± GND (R2±7)B±R ± BRPower source of antennaRadio switch ON and AM or FM10 to 14 V
ILL+ (R2±10) ± GND (R2±7)G ± BRIllumination (rheostat) sig-
nalLight control switch OFF " TAIL or
HEADBelow 1 V "
10 to 14 V
RR+ (R3±1) ± GND (R2±7)R ± BRSound signal (Rear Right)Audio system is playing
A waveform synchro-
nized with sounds is
output
RL+ (R3±2) ± GND (R2±7)B ± BRSound signal (Rear Left)Audio system is playing
A waveform synchro-
nized with sounds is
output
RR± (R3±3) ± GND (R2±7)W ± BRSound signal (Rear Right)Audio system is playing
A waveform synchro-
nized with sounds is
output
ILL± (R3±5) ± GND (R2±7)W±G ± BRIllumination (rheostat) sig-
nalLight control switch OFF " TAIL or
HEADBelow 1 V "
10 to 14 V
RL± (R3±6) ± GND (R2±7)Y ± BRSound signal (Rear Left)Audio system is playing
A waveform synchro-
nized with sounds is
output
GND (R19±6) ± GND (R2±7)BR±W ± BRSteering pad switch
groundAlwaysBelow 1 V

± 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

DI±2028
± DIAGNOSTICSAUDIO SYSTEM
2222 Author: Date:
2005 SEQUOIA (RM1146U)
Radio broadcast cannot be received (Bad reception)
INSPECTION PROCEDURE
1 Check if radio auto±search functions properly.
CHECK:
Check if the radio auto±search functions properly.
Perform the auto±search of the radio and check that it functions normally.
OK:
The radio auto±search functions properly.
OK Replace radio receiver assy.
NG
2 Check optional component.
CHECK:
Check for any optional component (sun shade film, telephone antenna etc.).
Check whether or not any optional component such as a sun shade film and telephone antenna is
installed.
OK:
Optional component is not installed.
NG Effect from optional component.
OK
DIDA4±01

I28352
± DIAGNOSTICSAUDIO SYSTEM
DI±2029
2223 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check antenna for noise production.
CHECK:
Noise Check with Antenna
(1) With the ignition switch in the ACC position, turn on the radio and choose the AM mode.
(2) Place the tip of a screwdriver on the antenna of the rear glass antenna, and check that noise is
heard from the speakers.
OK:
Noise occurs.
OK Replace radio receiver assy.
NG
4 Inspect radio receiver assy (Antenna).
CHECK:
(a) Preparation for Check
(1) Remove the antenna plug of the radio receiver as-
sembly.
(b) Noise Check
(1) With the radio receiver assy connector connected,
turn the ignition switch to the ACC position.
(2) Turn on the radio and choose the AM mode.
(3) Place a screwdriver or a piece of metal such as thin
wire on an antenna jack of the radio receiver assy
and check that noise is heard from the speaker.
OK:
Noise occurs.
NG Replace radio receiver assy.
OK
Replace antenna cord sub±assy.