Toyota Sequoia (2005). Manual - part 620

I28292

L+

R–

L–

R+

R30

Radio and Navigation Assy
Wire Harness View:

I28752

S10

Stereo Component Amplifier Assy
Wire Harness View:

L+

R–

L–

R+

–

DIAGNOSTICS

NAVIGATION SYSTEM

DI–2275

2469

INSPECTION PROCEDURE

1

Check harness and connector (Radio and navigation assy – stereo component
amplifier assy).

PREPARATION:
Disconnect the radio and navigation assy and stereo compo-
nent amplifier assy connectors.
CHECK:
Measure the resistance according to the values in the table be-
low.
OK:

Symbol (Tester connection)

Specified condition

L+ (R30–9) – L+ (S10–3)

Below 1 

Ω

L– (R30–19) – L– (S10–2)

Below 1 

Ω

R+ (R30–8) – R+ (S10–5)

Below 1 

Ω

R– (R30–18) – R– (S10–4)

Below 1 

Ω

L+ (R30–9) – Body ground

10 k

Ω 

or higher

L– (R30–19) – Body ground

10 k

Ω 

or higher

R+ (R30–8) – Body ground

10 k

Ω 

or higher

R– (R30–18) – Body ground

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–2184

).

I28478

Stereo Component 
Amplifier Assy

IB1

S9

T12 
Tweeter LH

F14 
Front Door Speaker 
and Woofer LH

IB1

IB1

IB1

S9

S9

S9

WFL+

FL–

WFL–

FL+

11

2

6

17

12

2

3

4

2

3

4

1

5

4

6

7

1

R

G

L–W

L

V

P

L–W

S10

23

22

S10

INT+

INT–

G

V

P

11

13

R27

W

B

(Shielded)

Radio and Navigation Assy

IVO+

IVO–

SLD1

R27

R27

DI–2276

–

DIAGNOSTICS

NAVIGATION SYSTEM

2470

Speaker circuit (Navigation voice)

CIRCUIT DESCRIPTION

This circuit is used when the voice guidance in the radio and navigation assy is on.
Voice guidance of the navigation system is heard from the front door speaker LH via the tweeter LH.

WIRING DIAGRAM

DIDDL–01

I28759

Connector Front View:

F14

–

DIAGNOSTICS

NAVIGATION SYSTEM

DI–2277

2471

INSPECTION PROCEDURE

1

Inspect apparatus.

CHECK:
Choose the apparatus to be inspected.
RESULT:

Apparatus

Go to step

Front door speaker LH

A

Front door speaker LH and tweeter LH

B

B

Go to step 5.

A

2

Inspect front door speaker assy.

PREPARATION:
Disconnect the speaker connector.
CHECK:
Measure the resistance between the terminals of the speaker.
NOTICE:
The speaker should not be removed for checking.
OK:

Tester connection

Specified condition

1 – 2

Approx. 3.15 

Ω

3 – 4

Approx. 2.78 

Ω

NG

Replace front door speaker.

OK

I28757

F14

Front Door Speaker
Connector Front View:

I28758

T12

Tweeter Connector front View:

DI–2278

–

DIAGNOSTICS

NAVIGATION SYSTEM

2472

3

Inspect tweeter.

CHECK:
Check that the malfunction disappears when another tweeter in good condition is installed.
OK:

Malfunction disappears.

HINT:

Connect all the connectors to the speakers.

When there is a possibility that either right or left front speaker is defective, inspect by interchanging
the right one with the left one.

OK

Replace tweeter.

NG

4

Check harness and connector (Front door speaker – tweeter).

CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:

Tester connection

Condition

Specified condition

F14–1 – T12–3

Always

Below 1 

Ω

F14–2 – T12–4

Always

Below 1 

Ω

F14–1 – Body ground

Always

10 k

Ω 

or higher

F14–2 – Body ground

Always

10 k

Ω 

or higher

NG

Repair or replace harness or connector.

NG

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

DI–2184

).