amplifier TOYOTA SEQUOIA 2001 Service Repair Manual

IN04Q±33
IN±40
± INTRODUCTIONTERMS
40 Author: Date:
2005 SEQUOIA (RM1146U)
TERMS
ABBREVIATIONS USED IN THIS MANUAL
AbbreviationsMeaning
ABSAnti±Lock Brake System
A/CAir Conditioner
ACAlternating Current
ACCAccessory
ACISAcoustic Control Induction System
ACMActive Control Engine Mount
ACSDAutomatic Cold Start Device
A.D.D.Automatic Disconnecting Differential
A/FAir±Fuel Ratio
AHCActive Height Control Suspension
ALRAutomatic Locking Retractor
ALTAlternator
AMPAmplifier
ANTAntenna
APPROX.Approximately
ASSYAssembly
A/T, ATMAutomatic Transmission (Transaxle)
AT FAutomatic Transmission Fluid
AUTOAutomatic
AUXAuxiliary
AV GAverage
AV SAdaptive Variable Suspension
B+Battery Voltage
BABrake Assist
BACSBoost Altitude Compensation System
BATBattery
BDCBottom Dead Center
B/LBi±Level
B/SBore±Stroke Ratio
BTDCBefore Top Dead Center
BVSVBimetallic Vacuum Switching Valve
CBCircuit Breaker
CCoCatalytic Converter For Oxidation
CCVCanister Closed Valve
CDCompact Disc
CFCornering Force
CGCenter Of Gravity
CHChannel
CKDComplete Knock Down
COMB.Combination
CPECoupe
CPSCombustion Pressure Sensor
CPUCentral Processing Unit
CRSChild Restraint System
CTRCenter
C/VCheck Valve
CVControl Valve
CWCurb Weight

DI1AM±35
DI±1578
± DIAGNOSTICSENGINE IMMOBILISER SYSTEM
1772 Author: Date:
2005 SEQUOIA (RM1146U)
DIAGNOSTIC TROUBLE CODE CHART
ECM DIAGNOSTIC TROUBLE CODE CHART (MIL)
DTC No.
(See page)Detection ItemTrouble Area
99
(DI±1580)Engine immobiliser system malfunction

Transponder key ECU

ECM

Wire harness
TRANSPONDER KEY ECU DIAGNOSTIC TROUBLE CODE CHART (SECURITY INDICATOR LIGHT)
DTC No.
(See page)Detection ItemTrouble Area
11
(DI±1582)Code 11 is not output

Unlock warning switch

Transponder key ECU

Wire harness
12
(DI±1585)Code 12 is not output

Driver door courtesy lamp switch

Transponder key ECU

Body ECU

Wire harness
13
(DI±1587)Code 13 is not output

Ignition switch

Transponder key ECU

Wire harness
21, 22
(DI±1589)Code 21 or 22 is not output

Key

Transponder key ECU

Transponder key amplifier with key coil

Wire harness
31, 35, 36, 37
(DI±1592)Code 31, 35, 36 or 37 is outputKey
32, 33
(DI±1593)Code 32 or 33 is output

Key

Transponder key ECU

Wire harness
34Code 34 is outputTransponder key ECU has no memory space to register anoth-
er key code
HINT:

DTCs 11, 12, 13, 21 and 22 are normal codes.

As for the normal codes, if the corresponding DTC is not output while operating any of the components
listed under ºTrouble Areaº, perform the inspection described in the reference pages.

DTCs 31, 32, 33, 34, 35, 36, 37 and 99 are abnormal codes.

DI3DP±10
I28395
ECM Transponder Key Coil
Transponder Key Amplifier Instrument
Panel J/B

IGN Fuse
Engine Room J/B

ECU±B Fuse

EFI No. 1 Fuse
Transponder Key ECU
Combination Meter

Security Indicator Light

MIL
DLC3
(Located behind the combination meter)
± DIAGNOSTICSENGINE IMMOBILISER SYSTEM
DI±1579
1773 Author: Date:
2005 SEQUOIA (RM1146U)
PARTS LOCATION

I03114
T6
Transponder Key
Amplifier
13
T16Transponder Key ECU
CODE RXCKTXCT
6
5
45
T16
4
T16 Y±G
LG
R±Y RXCK
CODE TXCT
± DIAGNOSTICSENGINE IMMOBILISER SYSTEM
DI±1589
1783 Author: Date:
2005 SEQUOIA (RM1146U)
Code 21 or 22 is not output
CIRCUIT DESCRIPTION
The transponder key ECU outputs DTC 21 while the immobilizer system is deactivated by use of the master
key, and outputs DTC 22 while it is deactivated by use of the sub key.
HINT:
DTCs 21 and 22 are normal codes.
DTC No.
(See Page)DTC Detecting ConditionTrouble Area
21, 22Communication is normal.

Key

Transponder key ECU

Transponder key amplifier with key coil

Wire harness
WIRING DIAGRAM
DIABG±04

DI±1590
± DIAGNOSTICSENGINE IMMOBILISER SYSTEM
1784 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check whether the engine can be started with the master key and sub±key for
another vehicle of the same type.
RESULT:
AAll keys start the engine.
BA specific key does not start the engine. In this case, DTC
21 or 22 is not stored in memory.
CAll keys do not start the engine. In this case, DTC 21 and 22
are not stored in memory.
A No problem at this time.
HINT:
If the result is ºAº, confirm whether or not the customer has ever
inserted the key (without a transponder chip) of another vehicle
into the ignition key cylinder.
B The transponder chip of a specific key is defec-
tive. Replace the key.
C
2 Check transponder key coil (See page BE±143).
NG Replace transponder key coil.
OK
3 Check harness and connector between transponder key ECU and transponder
key amplifier (See page IN±35).
NG Repair or replace harness or connector.
OK

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

DID9L±01
I28760
Built±in Type Amplifier:
Radio
Receiver
Assy
Steering Pad SwitchSpeakers Sound Signal Operation
Signal
Sound Signal
± DIAGNOSTICSAUDIO SYSTEM
DI±1957
2151 Author: Date:
2005 SEQUOIA (RM1146U)
SYSTEM DIAGRAM

I28735
Separate Type Amplifier:
Steering Pad Switch
AVC±LAN Speakers
Sound SignalOperation
Signal
Radio
Receiver
Assy Stereo
Component
Amplifier
Assy
Multi±display
Controller
Assy (*1)
Rear Seat Audio
Controller (*2)
*1: w/ Rear Seat Entertainment System
*2: w/Rear Seat Audio System
Display Signal DI±1958
± DIAGNOSTICSAUDIO SYSTEM
2152 Author: Date:
2005 SEQUOIA (RM1146U)

I28193
AVC±LANStereo Component
Amplifier Assy Radio Receiver Assy
(Resistor 60 to 80 W)
Example : DI±1960
± DIAGNOSTICSAUDIO SYSTEM
2154 Author: Date:
2005 SEQUOIA (RM1146U)
4. OUTLINE OF AVC±LAN
(a) What is AVC±LAN?
AVC±LAN is the abbreviation for Audio Visual Communication±Local Area Network. This is a unified
standard co±developed by 6 audio manufacturers associated with Toyota Motor Corporation.
The unified standard includes signals, such as audio, visual and signals for switch indication and com-
munication.
(b) Objectives
Recently development in car audio systems has been rapid and functions have been changed drasti-
cally. The conventional system has been switched to a multi±media type such as a navigation system.
At the same time customers wants to upgrade their audio systems. This is the factor that lies behind
this standardization.
The concrete objectives are explained below.
(1) When products by different manufacturers were combined together, malfunctions such as sound
failure occurred. This problem can be solved by standardization of signals.
(2) Various types of after market products are available.
(3) In general, a new product developed by a particular manufacturer could not be used due to a
lack of compatibility with other manufacturer's products. By developing this new standard, users
can enjoy a range of compatible products from different manufacturers.
HINT:

When +B short or GND short is detected in the AVC±LAN circuit, communication stops, and the audio
system will not function.

When the audio system is not equipped with a navigation system, the audio head unit is the master
unit. When the audio system is equipped with a navigation system, the multi±display is the master unit.

The radio receiver assy is equipped with a resistor (60 to 80 W) for communication.

All car audio systems using an AVC±LAN circuit have a diagnostic function.

Each unit has its own specified number called a physical address (three±digit number). Numbers are
also allotted to each function, which are called logical addresses (two±digit number).
5. COMMUNICATION SYSTEM
(a) Components in the audio system communicate with each other through the AVC±LAN. (Radio receiver
with CD changer control function)
(b) When a short circuit or circuit breakdown occurs in the AVC±LAN circuit, the audio system does not
operate normally due to the communication cutoff.

I28736
Main AVC±LAN:
(*1)
(*2, 3)Multi±display
Controller (*2)
Rear Seat Audio
Controller (*3) Radio
Receiver Assy Stereo
Component
Amplifier
Sub AVC±LAN:
(*2)
(*2)
Disc
Player
Controller
(*2) Television
Display Assy (*2)
*1: Separate Type Amplifier
*2: w/ RSE System
*3: w/ RSA System
± DIAGNOSTICSAUDIO SYSTEM
DI±1961
2155 Author: Date:
2005 SEQUOIA (RM1146U)
6. DIAGNOSTIC FUNCTION
(a) The audio system has diagnostic function (The diagnostic result is displayed on the LCD of the radio
receiver assy). (Radio receiver with CD changer control function)
(b) The component code (physical address), or three±digit number (in hexadecimal) is set for each com-
ponent comprising AVC±LAN.
(c) The logical address, or two±digit number (in hexadecimal) is set for each function and component unit
in each component.