Toyota Sequoia (2005). Manual — part 566
I28337
R24
+B
ACC
GND
–
DIAGNOSTICS
REAR SEAT AUDIO SYSTEM
DI–2059
2253
INSPECTION PROCEDURE
1
Inspect rear seat audio controller (+B, ACC, GND).
PREPARATION:
Disconnect the rear seat audio controller connector.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Symbol
(Tester connection)
Condition
Specified condition
GND (R24–17) –
Body ground
Always
Below 1
Ω
CHECK:
Measure the voltage according to the value(s) in the table be-
low.
OK:
Symbol
(Tester connection)
Condition
Specified condition
+B (R24–12) –
GND (R24–17)
Always
10 to 14 V
ACC (R24–24) –
GND (R24–17)
Ignition SW ACC
10 to 14 V
NG
Repair or replace harness or connector.
OK
DI–2060
–
DIAGNOSTICS
REAR SEAT AUDIO SYSTEM
2254
2
Check problem symptoms table.
CHECK:
Check the problem symptoms table.
RESULT:
All possible suspected areas have been inspected.
Go to step A
Possible suspected areas still exist.
Go to step B
B
Proceed to next circuit inspection shown in
problem symptoms table (See page
A
Replace rear seat audio controller.
I28599
I28773
w/o Navigation:
Radio Receiver Assy
Rear Seat Audio Controller
R19
Stereo Component Amplifier Assy
TX–
TX+
S10
ID2
LG
LG
V
P
L
9
10
5
R4
15
22
R24
23
TX1–
TX1+
TX–
TX+
27
26
TX–
TX+
20
19
R19
R4
LG
ID2
R24
S10
–
DIAGNOSTICS
REAR SEAT AUDIO SYSTEM
DI–2061
2255
AVC–LAN circuit
CIRCUIT DESCRIPTION
Each unit of the rear seat 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.
WIRING DIAGRAM
DIDAN–01
I28599
I28773
w/ Navigation:
Radio and Navigation Assy
Rear Seat Audio Controller
R27
Stereo Component Amplifier Assy
TX–
TX+
S10
ID2
LG
LG
V
P
L
9
10
5
15
22
R24
23
TX–
TX+
ATX–
ATX+
27
26
TX–
TX+
20
19
R30
LG
ID2
R24
S10
R30
R27
DI–2062
–
DIAGNOSTICS
REAR SEAT AUDIO SYSTEM
2256
INSPECTION PROCEDURE
1
Service check mode (Rear seat audio controller).
CHECK:
Start the diagnosis system and read the check result for the rear seat audio controller (See page
,
).
RESULT:
”NCON” is displayed or result is not displayed (w/ naviga-
tion)
Go to step A
”NCON” is displayed or result is not displayed (w/o naviga-
tion)
Go to step B
”NCON” is displayed or result is not displayed (DSP AMP)
Go to step C
”GOOD” is displayed
Go to step D
B
Go to step 3.
C
Go to step 4.
D
Replace radio and navigation assy or radio re-
ceiver assy.
A
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