2001 TOYOTA SEQUOIA speaker

DIDBQ±01
I28761
Radio
and
Navigation
Assy Steering Pad Switch
Stereo
Component
Amplifier
AssyVehicle Speed Signal
Reverse Signal
GPS Antenna
AVC±LAN Park/Neutral Position Switch Combination Meter
Speakers
Display Signal Sound SignalMulti±display
Controller
Assy (*1)
Rear Seat
Audio
Controller
(*2) *1: w/ RSE System
*2: w/ RSA System(*1)
± DIAGNOSTICSNAVIGATION SYSTEM
DI±2161
2355 Author: Date:
2005 SEQUOIA (RM1146U)
SYSTEM DIAGRAM

DIDC3±01
DI±2184
± DIAGNOSTICSNAVIGATION SYSTEM
2378 Author: Date:
2005 SEQUOIA (RM1146U)
PROBLEM SYMPTOMS TABLE
HINT:

Before performing verification listed in the table below, check the fuse and relay.

Methods used to verify the cause of the problem are listed in order of probability in the verification col-
umn.
Display function
SymptomVerificationSee page
Pressing PWR switch does not turn on system.
1. ºPRESSING POWER SWITCH DOES NOT TURN ON
SYSTEMº
2. Power source circuit (radio and navigation assy)
3. Replace radio and navigation assyDI±2213
DI±2256
±
Black screen (no image appears on navigation and audio screen).
1. ºBLACK SCREEN (NO IMAGE APPEARS ON NAV-
IGATION AND AUDIO SCREEN)º
2. Illumination circuit
3. Power source circuit (radio and navigation assy)
4. Replace radio and navigation assyDI±2214
DI±2260
DI±2256
±
Illumination for panel switch does not come on with TAIL switch
on.
1. ºILLUMINATION FOR PANEL SWITCH DOES NOT
COME ON WITH TAIL SWITCH ONº
2. Illumination circuit
3. Replace radio and navigation assyDI±2216
DI±2260
±
Display does not dim (night screen) with TAIL switch on.
1. ºDISPLAY DOES NOT DIM (NIGHT SCREEN) WITH
TAIL SWITCH ONº
2. Illumination circuit
3. Replace radio and navigation assyDI±2217
DI±2260
±
Power does not turn off (screen remains on).1. Power source circuit (radio and navigation assy)
2. Replace radio and navigation assyDI±2256
±
Panel switch does not function.
1. ºPANEL SWITCH DOES NOT FUNCTIONº
2. Steering pad switch circuit
3. Replace radio and navigation assyDI±2218
DI±2287
±
Touch panel switch does not function.
1. ºTOUCH PANEL SWITCH DOES NOT FUNCTIONº
2. Power source circuit (radio and navigation assy)
3. Replace radio and navigation assyDI±2219
DI±2256
±
Display panel does not open, tilt, or tilts improperly.
1. ºDISPLAY PANEL DOES NOT OPEN, TILT, OR TILTS
IMPROPERLYº
2. Power source circuit (radio and navigation assy)
3. Replace radio and navigation assyDI±2220
DI±2256
±
Screen is distorted.1. Power source circuit (radio and navigation assy)
2. Replace radio and navigation assyDI±2256
±
Screen flicker or color distortion.
1. ºSCREEN FLICKER OR COLOR DISTORTIONº
2. Power source circuit (radio and navigation assy)
3. Replace radio and navigation assyDI±2221
DI±2256
±
Audio function
SymptomVerificationSee page
No sound can be heard from speakers (audio is mute).
1. ºNO SOUND CAN BE HEARD FROM SPEAKERS
(AUDIO IS MUTE)º
2. Speaker circuit
3. AVC±LAN circuit (radio and navigation ± stereo compo-
nent amplifier)
4. Amplifier sound signal circuit
5. Amplifier mute signal circuit
6. Replace stereo component amplifier
7. Replace radio and navigation assyDI±2224
DI±2282
DI±2268
DI±2274
DI±2271
±
±

± DIAGNOSTICSNAVIGATION SYSTEM
DI±2185
2379 Author: Date:
2005 SEQUOIA (RM1146U) Radio broadcast cannot be received (poor reception).
1. ºRADIO BROADCAST CANNOT BE RECEIVED
(POOR RECEPTION)º
2. Replace radio and navigation assyDI±2225
±
CD cannot be inserted/played or CD is ejected right after inser-
tion.
1. ºCD CANNOT BE INSERTED/PLAYED OR CD IS
EJECTED RIGHT AFTER INSERTIONº
2. Power source circuit (radio and navigation assy)
3. Replace radio and navigation assyDI±2228
DI±2256
±
CD cannot be ejected.
1. ºCD CANNOT BE EJECTEDº
2. Power source circuit (radio and navigation assy)
3. Replace radio and navigation assyDI±2231
DI±2256
±
Abnormal noise occurs.
1. ºABNORMAL NOISE OCCURSº
2. Power source circuit (radio and navigation assy)
3. Replace radio and navigation assyDI±2233
DI±2256
±
CD sound skips.1. ºCD SOUND SKIPSº
2. Replace radio and navigation assyDI±2234
±
Poor sound quality in all modes (low volume).
1. ºPOOR SOUND QUALITY IN ALL MODES (LOW VOL-
UME)º
2. AMP mute signal circuit
3. Replace radio and navigation assy
4. Replace stereo component amplifierDI±2236
DI±2271
±
±
Navigation function
SymptomVerificationSee page
Map disc cannot be inserted.
1. ºMAP DISC CANNOT BE INSERTEDº
2. Power source circuit (radio and navigation assy)
3. Replace radio and navigation assyDI±2237
DI±2256
±
Map disc cannot be ejected.
1. ºMAP DISC CANNOT BE EJECTEDº
2. Power source circuit (radio and navigation assy)
3. Replace radio and navigation assyDI±2238
DI±2256
±
Vehicle position mark deviates greatly.
1. ºVEHICLE POSITION MARK DEVIATES GREATLYº
2. Replace GPS antenna assy
3. Replace radio and navigation assyDI±2239
±
±
Cursor or map rotates when vehicle is stopped.
1. ºCURSOR OR MAP ROTATES WHEN VEHICLE IS
STOPPEDº
2. Replace radio and navigation assyDI±2241
±
Vehicle position mark is not updated.
1. ºVEHICLE POSITION MARK IS NOT UPDATEDº
2. Replace map disc
3. Replace radio and navigation assyDI±2242
±
±
Current position display does not appear.
1. ºCURRENT POSITION DISPLAY DOES NOT AP-
PEARº
2. Replace map disc
3. Replace radio and navigation assyDI±2244
±
±
GPS mark does not displayed.
1. ºGPS MARK IS NOT DISPLAYEDº
2. Replace GPS antenna assy
3. Replace radio and navigation assyDI±2245
±
±
Voice guidance does not function.
1. ºVOICE GUIDANCE DOES NOT FUNCTIONº
2. Speaker circuit
3. Replace map disc
4. Replace radio and navigation assyDI±2248
DI±2282
±
±

I28254
DI±2224
± DIAGNOSTICSNAVIGATION SYSTEM
2418 Author: Date:
2005 SEQUOIA (RM1146U)
No sound can be heard from speakers (Audio Is mute)
INSPECTION PROCEDURE
1 Check audio settings.
PREPARATION:
Enter the sound adjustment screen by pressing the ºSOUNDº
switch on the AUDIO display.
CHECK:
Set volume, fader, and balance to the initial values and check
that sound is normal.
OK:
Audio returns to normal.
HINT:
Sound quality adjustment items vary depending on the type of
the amplifier.
OK End.
NG
Proceed to next circuit inspection shown in problem symptoms table (See page DI±2184).
DIDCJ±01

I28255
DI±2226
± DIAGNOSTICSNAVIGATION SYSTEM
2420 Author: Date:
2005 SEQUOIA (RM1146U)
3 Inspect radio and navigation assy.
PREPARATION:
Remove the antenna plug from the radio and navigation assy.
CHECK:
With the radio and navigation assy connector connected, turn
the ignition switch to the ACC position.
Turn on the radio and choose the AM mode.
Place a screwdriver or a piece of metal such as thin wire on an
antenna jack of the radio and navigation assy and check that
the noise is heard from the speaker.
OK:
Noise occurs.
NG Replace radio and navigation assy.
OK
4 Check antenna assy.
CHECK:
Check that the antenna is securely installed.
OK:
The antenna is installed properly.
NG Install antenna assy properly.
OK

± DIAGNOSTICSNAVIGATION SYSTEM
DI±2233
2427 Author: Date:
2005 SEQUOIA (RM1146U)
Abnormal noise occurs
INSPECTION PROCEDURE
1 Check 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 only excessively loud noise. If loud noise
occurs, check that all wiring is proper and that the antenna installation part ground and noise±prevention
equipment are installed.
Conditions under 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 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 is 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 continues even after the engine
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 relevant part.

First ensure that the noise is not coming from outside. Failure to do so makes noise source detection
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±2174).
DIDCO±01

DI±2250
± DIAGNOSTICSNAVIGATION SYSTEM
2444 Author: Date:
2005 SEQUOIA (RM1146U)
4 Check radio and navigation assy.
CHECK:
Check if audio sound can be heard from the driver's side speaker.
OK:
Audio sound can be heard.
NG Proceed to next circuit inspection shown in
problem symptoms table (See page DI±2184).
OK
Replace radio and navigation assy.

I28483
Radio and Navigation Assy
R±W 1
7
R28 MUTE
MUTE Stereo Component
Amplifier Assy
S10
± DIAGNOSTICSNAVIGATION SYSTEM
DI±2271
2465 Author: Date:
2005 SEQUOIA (RM1146U)
Amplifier mute signal circuit
CIRCUIT DESCRIPTION
This circuit sends a signal to the stereo component amplifier to mute noise. Because of that, the noise pro-
duced by changing the sound source ceases.
If there is an open in the circuit, noise can be heard from the speakers when changing the sound source.
If there is a short in the circuit, even though the stereo component amplifier assy is normal, no sound or only
an extremely small sound can be produced.
WIRING DIAGRAM
DIDDI±01