Toyota Sequoia (2005). Manual - part 622

I28477

Stereo Component 
Amplifier Assy

IB1

S9

T12 
Tweeter LH

F14 Front Door Speaker 
and Woofer LH

F15 Front Door Speaker 
and Woofer RH

T13 
Tweeter RH

II2

J/C

BC1

BA1

R10 
Rear Door 
Speaker RH

R9 
Rear Door 
Speaker LH

J/C

BC1

BA1

II2

II2

II2

J49

J48

J49

J48

J34

J33

IB1

IB1

IB1

S9

S9

S9

S9

S9

S9

S9

S9

S9

S9

S9

FL–

WFL+

WFR–

FR+

RR+

RL+

FL+

WFL–

WFR+

FR–

RR–

RL–

11

2

6

17

18

7

3

5

12

14

4

13

2

3

4

1

3

1

2

4

2

3

4

1

2

3

4

1

5

4

6

7

2

1

10

9

11

12

11

12

2

1

2

1

I

C

H

B

K

E

L

F

V

P

G

L–W

L

R

V

P

G

L–W

R

Y

L

LG

R

Y

L

LG

V

P

R

W

R

W

R

W

Y

B

Y

B

Y

B

J34

J33

–

DIAGNOSTICS

NAVIGATION SYSTEM

DI–2283

2477

WIRING DIAGRAM

I36938

I28293

Stereo Component Amplifier Assy
Wire Harness View:

RR+

FL+

RL+

WFL+

RR–

FL–

RL–

WFL–

WFR–

WFR+

FR–

FR+

S9

I28355

Rear Speaker Connector Front View:

R10

R9

I28757

Front Door Speaker Assy and Woofer 
Connector Front View:

F14

F15

I28758

Tweeter Connector Front View:

T12

T13

DI–2284

–

DIAGNOSTICS

NAVIGATION SYSTEM

2478

INSPECTION PROCEDURE

1

Check harness and connector (Stereo component amplifier assy – speaker
assy).

PREPARATION:
Disconnect the connectors from the stereo component amplifi-
er assy and speakers.
CHECK:
Measure the resistance between the speaker and the stereo
component amplifier to check for an open circuit in the wire har-
ness.
OK:

Below 1 

Ω

CHECK:
Measure the resistance between the speaker and body ground
to check for a short circuit in wire harness.
OK:

10 k

Ω

 or higher

NG

Repair or replace harness or connector.

OK

I28759

Connector Front View:

F14

F15

–

DIAGNOSTICS

NAVIGATION SYSTEM

DI–2285

2479

2

Inspect front door speaker and woofer.

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

OK

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

DI–2286

–

DIAGNOSTICS

NAVIGATION SYSTEM

2480

4

Inspect rear speaker assy.

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

2.6 

±

 0.2 

Ω

NG

Replace rear speaker assy.

OK

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

DI–2184

).