2001 TOYOTA SEQUOIA Service Repair Manual

timing belt clock park assist warning clock setting fuel pump

Page 2161 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual DID9M±01
I28302
Example :
HeadCapstan
Pinch Roller
I28257
± DIAGNOSTICSAUDIO SYSTEM
DI±1959
2153 Author: Date:
2005 SEQUOIA (RM1146U)
SYSTEM DESCRIPTION
1. COMPACT DISC PLAYER
Compact Disc (her

Page 2162 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual 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

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.

Page 2163 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual 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) Tele

Page 2164 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual DID9N±01
Vehicle brought into a workshop
3. Check the diagnostic trouble codes
DTC is not output (Go to step 5)
4. Diagnostic trouble code chart.
Go to step 6
6. Circuit inspection and part inspectio

Page 2165 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual DID9O±01
AUDIO SYSTEM Check Sheet
Inspector s name:
Customer s NameVIN
Production Date
Licence Plate No.
Odometer Reading / /km
mile
Frequency of Problem Occurrence

Page 2166 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual 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
Ionosp

Page 2167 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual BE2820
Multipath
BE2821
Fade Out
± DIAGNOSTICSAUDIO SYSTEM
DI±1965
2159 Author: Date:
2005 SEQUOIA (RM1146U)
(b) Multipath
Interference caused by reflection of radio waves against
obstructions

Page 2168 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual 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 whic

Load next 8 pages

Page: < prev 1-10 ... 2129-2136 2137-2144 2145-2152 2153-2160 2161-2168 2169-2176 2177-2184 2185-2192 2193-2200 ... 4328 next >

rear entertainment child restraint brake pads replacement warning lights bolt pattern keyless entry