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 

DI–2050

).

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 

DI–1974

,

DI–2191

).

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