Toyota Sequoia (2005). Manual — part 618
I28747
Radio and Navigation Assy
Wire Harness View:
R30
ILL–
I28577
R6
Light Control Rheostat
Wire Harness View:
ILL–
–
DIAGNOSTICS
NAVIGATION SYSTEM
DI–2267
2461
NG
Replace light control rheostat.
OK
9
Check harness and connector (Radio and navigation assy – light control rheo-
stat).
PREPARATION:
Disconnect the radio and navigation assy connector.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Symbol
(Tester connection)
Condition
Specified condition
ILL– (R30–12) –
ILL– (R6–6)
Always
Below 1
Ω
ILL– (R30–12) –
Body ground
Always
10 k
Ω
or higher
NG
Repair or replace wire harness or connector.
OK
Replace radio and navigation assy.
I28482
Stereo Component
Amplifier Assy
Radio and Navigation Assy
TX+ S10
R30
V
P
TX– S10
ATX+
ATX–
20
5
19
15
R30
DI–2268
–
DIAGNOSTICS
NAVIGATION SYSTEM
2462
AVC–LAN circuit (Radio and navigation assy – stereo component
amplifier assy)
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 and navigation assy becomes the master of the communication and the has re-
sistance necessary for communication.
WIRING DIAGRAM
DIDDH–01
I28747
Radio and Navigation Assy
Wire Harness View:
ATX+
ATX–
R30
I28752
TX+
TX–
S10
Stereo Component Amplifier Assy
Wire Harness View:
–
DIAGNOSTICS
NAVIGATION SYSTEM
DI–2269
2463
INSPECTION PROCEDURE
1
Service check mode (Stereo component amplifier assy).
CHECK:
Start the diagnostic system and read the check result for the stereo component amplifier assy (See page
).
RESULT:
”NCON” is displayed or result is not displayed (DSP AMP)
Go to step A
”GOOD” is displayed
Go to step B
B
Proceed to next circuit inspection shown in
problem symptoms table or diagnostic trouble
code chart (See page
A
2
Check harness and connector (Radio and navigation assy – stereo component
amplifier assy).
PREPARATION:
Disconnect the radio and navigation assy and stereo compo-
nent amplifier assy connectors.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Symbol
(Tester connection)
Condition
Specified condition
ATX+ (R30–5) –
TX+ (S10–20)
Always
Below 1
Ω
ATX– (R30–15) –
TX– (S10–19)
Always
Below 1
Ω
ATX+ (R30–5) –
Body ground
Always
10 k
Ω
or higher
ATX– (R30–15) –
Body ground
Always
10 k
Ω
or higher
NG
Repair or replace harness or connector.
OK
DI–2270
–
DIAGNOSTICS
NAVIGATION SYSTEM
2464
Replace stereo component amplifier assy.
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