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

DI–2191

).

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 

DI–2184

 or 

DI–2203

)

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.