Toyota Sequoia (2005). Manual - part 589

I28299

RMUT

Radio and Navigation Assy
Wire Harness View:

R27

I28612

MUTE

Radio and Navigation Assy 
Wire Harness View:

R28

I29009

Multi–display Controller Sub–assy:

RMUT

R23

LMUT

–

DIAGNOSTICS

REAR SEAT ENTERTAINMANT SYSTEM

DI–2151

2345

5

Check harness and connector (Radio and navigation assy – Multi–display con-
troller sub–assy).

PREPARATION:
Disconnect the R23, R27 and R28 connectors.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:

Symbol (Tester connection)

Condition

Specified condition

RMUT (R23–28) – RMUT (R27–19)

Always

Below 1 

Ω

LMUT (R23–12) – MUTE (R28–6)

Always

Below 1 

Ω

RMUT (R23–28) – Body ground

Always

10 k

Ω 

or higher

LMUT (R23–12) – Body ground

Always

10 k

Ω 

or higher

NG

Repair or replace harness or connector.

OK

DI–2152

–

DIAGNOSTICS

REAR SEAT ENTERTAINMANT SYSTEM

2346

6

Replace multi–display controller sub–assy.

CHECK:
Replace the multi–display controller sub–assy and check if it operates normally.
OK:

Normal operation.

OK

Normal operation.

NG

Replace radio and navigation assy.

I28378

Multi–display
Controller Sub–assy

LG

1

MUTE

R22

MUTE

D23
Disc Player Controller

10

I28610

R22

MUTE

Multi–display Controller Sub–assy:

–

DIAGNOSTICS

REAR SEAT ENTERTAINMANT SYSTEM

DI–2153

2347

Mute signal circuit (Disc player controller – Multi–display control-
ler sub–assy)

CIRCUIT DESCRIPTION

The multi–display controller sub–assy controls the volume according to the MUTE signal from the disc player
controller.
The MUTE signal is sent to reduce noise and a popping sound generated when the mode, etc. is switched.

WIRING DIAGRAM

INSPECTION PROCEDURE

1

Inspect multi–display controller sub–assy.

PREPARATION:
Make sure that the R22 connector is connected.
CHECK:
Measure the voltage according to the value(s) in the table be-
low.
OK:

Symbol 

(Tester connection)

Condition

Specification

MUTE (R22–1) –

Body ground

Turn ignition switch to

ACC, RSE system is

sounding 

→

Changing

mode

Above 3.5 V 

→

 Below 1 V

OK

Proceed to next circuit inspection shown in
problem symptoms table (See page 

DI–2087

).

NG

DIDBL–01

I28617

Disc Player Controller:

Multi–display Controller Sub–assy:

MUTE

MUTE

D23

R22

DI–2154

–

DIAGNOSTICS

REAR SEAT ENTERTAINMANT SYSTEM

2348

2

Check harness and connector (Disc player controller – Multi–display controller
sub–assy).

PREPARATION:
Disconnect the R22 and D23 connectors.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:

Symbol (Tester connection)

Condition

Specified condition

MUTE (D23–10) – MUTE (R22–1)

Always

Below 1 

Ω

MUTE (D23–10) – Body ground

Always

10 k

Ω 

or higher

NG

Repair or replace harness or connector.

OK

Proceed to next circuit inspection shown in problem symptoms table (See page 

DI–2087

).