Toyota Sequoia (2005). Manual - part 568

I28336

RMUT

R24

Wire Harness View:

–

DIAGNOSTICS

REAR SEAT AUDIO SYSTEM

DI–2067

2261

INSPECTION PROCEDURE

1

Inspect rear seat audio controller.

PREPARATION:
Make sure that the rear seat audio controller connector is con-
nected.
CHECK:
Measure the voltage according to the value in the table below.
OK:

Symbol 

(Tester connection)

Condition

Specification

RMUT (R24–11) – Body

ground

Turn ignition switch to

ACC, Audio system is

playing 

→

Changing mode

Above 3.5 V 

→

 Below 1 V

OK

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

DI–2050

).

NG

2

Check system.

CHECK:
Check whether the vehicle is equipped with a navigation system or not.
RESULT:

w/o Navigation

Go to step A

w/ Navigation

Go to step B

B

Go to step 5.

A

I28337

R24

RMUT

Rear Seat Audio Controller
Wire Harness View:

I28605

RMU

R19

Radio Receiver Assy 
Wire Harness View:

DI–2068

–

DIAGNOSTICS

REAR SEAT AUDIO SYSTEM

2262

3

Check harness and connector (Radio receiver assy – Rear seat audio controller).

PREPARATION:
Disconnect the R19 and R24 connectors.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:

Symbol 

(Tester connection)

Condition

Specified condition

RMUT (R24–11) – 

RMU (R19–19)

Always

Below 1 

Ω

RMUT (R24–11) – Body

ground

Always

10 k

Ω 

or higher

NG

Repair or replace harness or connector.

OK

4

Replace rear seat audio controller.

CHECK:
Replace the rear seat audio controller and check if it operates normally.
OK:

The function returns to normal.

OK

Normal operation.

NG

Replace radio receiver assy.

I28337

R24

RMUT

Rear Seat Audio Controller
Wire Harness View:

I28299

RMU

Radio and Navigation Assy
Wire Harness View:

R27

–

DIAGNOSTICS

REAR SEAT AUDIO SYSTEM

DI–2069

2263

5

Check harness and connector (Radio and navigation assy – Rear seat audio con-
troller).

PREPARATION:
Disconnect the R24 and R27 connectors.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:

Symbol 

(Tester connection)

Condition

Specified condition

RMUT (R24–11) – 

RMU (R27–19)

Always

Below 1 

Ω

RMUT (R24–11) – Body

ground

Always

10 k

Ω 

or higher

NG

Repair or replace harness or connector.

OK

6

Replace rear seat audio controller.

CHECK:
Replace the rear seat audio controller and check if it operates normally.
OK:

The function returns to normal.

OK

Normal operation.

NG

Replace radio and navigation assy.

I28600

w/ Navigation System:

Radio and Navigation Assy

Rear Seat Audio Controller

R–R+

ID2

15

9

W

W

R27

R–R–

16

R24

8

W

G

R–L+

17

R24

7

W

B

R–L–

18

R24

W

R

SG1

14

R24

10

6

9

8

7

10

6

R–R+

R–R–

R–L+

R–L–

RSLD

(Shielded)

(Shielded)

ID2

ID2

ID2

ID2

R24

R27

R27

R27

R27

DI–2070

–

DIAGNOSTICS

REAR SEAT AUDIO SYSTEM

2264

Sound signal circuit (Radio receiver assy / radio and navigation
assy  – rear seat audio controller)

CIRCUIT DESCRIPTION

The radio receiver assy (radio and navigation assy) sends a sound signal to the rear seat audio controller
through this circuit.
The sound signal that has been sent is amplified by the stereo component amplifier assy, and then sent to
the speaker.
If there is an open or short in the circuit, sound can not be heard from the speaker even if there is no malfunc-
tion in the rear seat audio controller or speaker.

WIRING DIAGRAM

DIDAP–01