Toyota Sequoia (2005). Manual - part 569

I28600

w/o Navigation System:

Radio Receiver Assy

Rear Seat Audio Controller

R–R+

ID2

15

R24

9

W

W

R19

R–R–

16

R24

8

W

G

R19

R–L+

17

R24

7

W

B

R19

R–L–

18

R24

W

R

R19

SG1

14

R24

10

R19

6

9

8

7

10

6

RSR+

RSR–

RSL+

RSL–

SLD1

(Shielded)

(Shielded)

ID2

ID2

ID2

ID2

–

DIAGNOSTICS

REAR SEAT AUDIO SYSTEM

DI–2071

2265

I28606

Radio Receiver Assy
Wire Harness View:

R19

RSR+

RSR–

RSL+

SLD1

RSL–

I28750

Radio and Navigation Assy
Wire Harness View:

R27

R–L+

R–L–

R–R–

R–R+

RSLD

I28337

R–R+

Rear Seat Audio Controller
Wire Harness View:

R–R–

R–L+

SG1

R–L–

R24

DI–2072

–

DIAGNOSTICS

REAR SEAT AUDIO SYSTEM

2266

INSPECTION PROCEDURE

1

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

PREPARATION:
Disconnect the radio receiver assy or radio and navigation con-
nector and rear seat audio controller connector.
CHECK:
Measure the resistance according to the values in the table be-
low.
OK:

Symbol (Tester connection)

Specified condition

R–R+ (R24–9) – R–R+ (R27–15) (*1), RSR+ (R19–15) (*2)

Below 1 

Ω

R–R– (R24–8) – R–R– (R27–16) (*1), RSR– (R19–16) (*2)

Below 1 

Ω

R–L+ (R24–7) – R–L+ (R27–17) (*1), RSL+ (R19–17) (*2)

Below 1 

Ω

R–L– (R24–6) – R–L– (R27–18) (*1), RSL– (R19–18) (*2)

Below 1 

Ω

SG1 (R24–10) – RSLD (R27–14), SLD1 (R19–14)

Below 1 

Ω

R–R+ (R24–9) – Body ground

10 k

Ω 

or higher

R–R– (R24–8) – Body ground

10 k

Ω 

or higher

R–L+ (R24–7) – Body ground

10 k

Ω 

or higher

R–L– (R24–6) – Body ground

10 k

Ω 

or higher

SG1 (R24–10) – Body ground

10 k

Ω 

or higher

*1: w/ Navigation System
*2: w/o Navigation System

NG

Repair or replace harness or connector.

OK

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

DI–2050

).

I28601

H10
Headphone Terminal LH

Rear Seat Audio Controller

HP1R

ID2

R24

3

BR

W

HP1L

ID2

R24

2

BR

B

SGN1

ID2

R24

1

3

2

1

(Shielded)

(Shielded)

BR

BR

HPR

HPL

SGND

(Shielded)

IF3

8

7

6

H11
Headphone Terminal RH

HP2R

ID2

R24

15

BR

W

HP2L

ID2

R24

14

BR

B

SGN2

ID2

R24

13

19

18

17

(Shielded)

(Shielded)

BR

BR

HPR

HPL

SGND

(Shielded)

20

19

18

1

2

3

1

2

3

IF3

IF3

IF3

IF3

IF3

–

DIAGNOSTICS

REAR SEAT AUDIO SYSTEM

DI–2073

2267

Sound signal circuit (Rear seat audio controller – headphone ter-
minal)

CIRCUIT DESCRIPTION

Music sound which is heard via the headphone terminal of the rear seat audio system is directly sent to the
headphones  without being sent through the stereo component amplifier.

WIRING DIAGRAM

DIDAQ–01

I28336

SGN1

HP1L

HP1R

SGN2

HP2R

R24

HP2L

DI–2074

–

DIAGNOSTICS

REAR SEAT AUDIO SYSTEM

2268

INSPECTION PROCEDURE

1

Inspect rear seat audio controller (Output signal).

PREPARATION:
Make sure that the rear seat audio connector is connected.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:

Symbol 

(Tester connection)

Condition

Specified condition

SGN1 (R24–1) – Body

ground

Always

Below 1 

Ω

SGN2 (R24–13) – Body

ground

Always

Below 1 

Ω

CHECK:
Check the waveform according to the condition(s) in the table
below.

OK:

Symbol (Tester connection)

Condition

Specified condition

HP1L (R24–2) – Body ground

Voice sound is being produced

A waveform synchronized with sound is output

HP1R (R24–3) – Body ground

Voice sound is being produced

A waveform synchronized with sound is output

HP2L (R24–14) – Body  ground

Voice sound is being produced

A waveform synchronized with sound is output

HP2R (R24–15) – Body ground

Voice sound is being produced

A waveform synchronized with sound is output

NG

Replace rear seat audio controller.

OK