Toyota Sequoia (2005). Manual - part 615

I28261

–

DIAGNOSTICS

NAVIGATION SYSTEM

DI–2255

2449

Speed signal error

INSPECTION PROCEDURE

1

Navigation check mode (Vehicle sensors check).

CHECK:
(a)

Enter the ”Navigation Check” mode (Vehicle Sensors)
(See page 

DI–2180

).

(b)

While driving, compare the ”SPD” indicator to the reading
on the speedometer. Check if these readings are almost
the same.

OK:

The readings are almost the same.

OK

Replace radio and navigation assy.

NG

Proceed to next circuit inspection shown in diagnostic trouble code chart (See page 

DI–2203

).

DIDD9–01

I28474

11

Radio and 
Navigation Assy

ACC

1

20

GND

GR

1

RAD No. 2

4

3

A36 
ACC Cut Relay

P

3

1

AM1

ACC

12

Sub J/B No. 3

3A

W–R

W–R

1

IA1

24

L–Y

L–Y

2B

3

2C

8

2D

1

Engine Room J/B

RAD No. 1

ECU–B

Short Pin

1J

3

1E

W–R

1L

1

1C

6

AM1

2

ALT

B

Battery

IO

BR

R30

3A

I18 
Ignition SW

W–L

B

2

12

1

1C

1F

GR

GR

B

C

B–O

J37

To ECM

J38

Instrument Panel J/B

1

2

B

R30

R30

J/C

P

W

W–R

B

8

5

4

F10 
FL Block

DI–2256

–

DIAGNOSTICS

NAVIGATION SYSTEM

2450

Power source circuit (Radio and navigation assy)

CIRCUIT DESCRIPTION

This circuit provides power to the radio and navigation assy.

WIRING DIAGRAM

DIDDB–01

I28292

B

GND

ACC

R30

–

DIAGNOSTICS

NAVIGATION SYSTEM

DI–2257

2451

INSPECTION PROCEDURE

1

Inspect radio and navigation assy (B, ACC, GND).

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

GND (R30–20) – 

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 (R30–1) – 

GND (R30–20)

Always

10 to 14 V

ACC (R30–11) – 

GND (R30–20)

Ignition switch is in ACC

10 to 14 V

NG

Repair or replace harness or connector.

OK

Proceed to next circuit inspection shown in problem symptoms table or diagnostic trouble code
chart (See page 

DI–2203

 or 

DI–2184

).

I28475

GR

1

4

3

A36 
ACC Cut Relay

12

Sub J/B No. 3

3A

W–R

1

2

3A

GR

B

C

B–O

J37

To ECM

J38

RAD No. 2

3

1

6

AM1

2

12

1

Instrument Panel J/B

1

2

P

3

AM1

ACC

W–R

W–L

ALT

B

Battery

W–R

IL1

2

L–W

2A

2C

8

2D

1

Engine Room J/B

RAD No. 3

ECU–B Short Pin

3

B

B

B

B

J11

J10

J11

L–W

IO

BR

BR

S10

S9

S9

S9

S9

12

10

15

16

1

ACC

B2+

B+

GND

E

Stereo Component 
Amplifier Assy

1J

1E

1L

1C

1C

1F

J/C

J/C

B

1

GR

L–W

L–W

W–R

I18 
Ignition SW

P

W

8

4

5

F10 
FL Block

DI–2258

–

DIAGNOSTICS

NAVIGATION SYSTEM

2452

Power source circuit (Stereo component amplifier assy)

CIRCUIT DESCRIPTION

This circuit provides power to the stereo component amplifier assy.

WIRING DIAGRAM

DIDDD–01