Toyota Sequoia (2005). Manual — part 557
I28506
Stereo Component
Amplifier Assy
Radio Receiver Assy
TX+ S10
R4
V
P
TX– S10
R4
TX+
TX–
20
5
19
15
–
DIAGNOSTICS
AUDIO SYSTEM
DI–2023
2217
AVC–LAN circuit (Radio receiver assy – stereo component ampli-
fier)
CIRCUIT DESCRIPTION
Each unit of the audio system connected to the AVC–LAN (communication bus) transfers the signal of each
switch by communication.
When a short to +B or short to ground occurs in this AVC– LAN, the audio system will not function normally
as communication is discontinued.
In this AVC–LAN, the radio receiver assy becomes the master of the communication, and the radio receiver
assy has resistance necessary for communication.
WIRING DIAGRAM
DIDA1–01
I28765
Radio Receiver Assy
Wire Harness View:
TX–
TX+
R4
DI–2024
–
DIAGNOSTICS
AUDIO SYSTEM
2218
INSPECTION PROCEDURE
1
Inspect radio receiver assy.
PREPARATION:
Disconnect the radio receiver assy connector.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Symbol
(Tester connection)
Condition
Specified condition
TX+(R4–5) – TX– (R4–15)
Always
60 to 80
Ω
NG
Replace radio receiver assy.
OK
I28739
Radio Receiver Assy
Wire Harness View:
TX–
TX+
R4
I28752
Stereo Component Amplifier Assy:
TX–
TX+
S10
–
DIAGNOSTICS
AUDIO SYSTEM
DI–2025
2219
2
Check harness and connector (Radio receiver assy – Stereo component amplifi-
er assy).
PREPARATION:
Disconnect the stereo component amplifier assy connector.
CHECK:
Measure the resistance according to the values in the table be-
low.
OK:
Symbol (Tester connection)
Specified condition
TX+ (R4–5) – TX+ (S10–20)
Below 1
Ω
TX– (R4–15) – TX– (S10–19)
Below 1
Ω
TX+ (R4–5) – Body ground
10 k
Ω
or higher
TX– (R4–15) – Body ground
10 k
Ω
or higher
NG
Repair or replace harness or connector.
OK
Proceed to next circuit inspection shown on problem symptoms table or diagnostic trouble code
chart (See page
DI–2026
–
DIAGNOSTICS
AUDIO SYSTEM
2220
Sound quality is bad in all modes (Volume is too low)
INSPECTION PROCEDURE
1
Adjust sound quality.
CHECK:
Set ”BASS” and ”TREB” to the initial values and check if sounds is normal.
OK:
Malfunction disappears.
OK
System is OK.
NG
2
Replace stereo component amplifier assy.
Replace the stereo component amplifier assy and check if it operates normally.
OK:
Malfunction disappears.
NG
Replace radio receiver assy.
OK
End.
DIDA2–01
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