Toyota Sequoia (2005). Manual - part 555

I28504

FL–

FR+

RR+

RL+

FL+

FR–

RR–

RL–

IB1

5

4

V

P

V

P

IB1

R2

R3

R2

R3

R3

R3

R2

R2

2

6

L

LG

L

LG

5

2

6

T12 
Tweeter LH

3

1

2

4

1

3

1

9

10

II2

II2

V

P

L

R

3

1

2

4

T13 
Tweeter RH

1

2

1

2

B

Y

R

W

B

Y

R

W

B

Y

R

W

1

2

1

2

BA1

BC1

BA1

BC1

Junction 
Connector

Junction 
Connector

J34

J33

J49

J48

11

12

11

12

J34

J33

J49

J48

B

L

K

F

E

H

I

C

F16 
Front Door 
Speaker LH

F17 
Front Door 
Speaker RH

R9 
Rear Door 
Speaker LH

R10 
Rear Door 
Speaker RH

Radio Receiver Assy

Built–in Type Amplifier:

–

DIAGNOSTICS

AUDIO SYSTEM

DI–2015

2209

DI–2016

–

DIAGNOSTICS

AUDIO SYSTEM

2210

INSPECTION PROCEDURE

1

Check apparatus.

CHECK:
Choose the apparatus to be inspected.

Apparatus

Go to step

Separate type amplifier

A

Built–in type amplifier

B

B

Go to step 6.

A

I36938

I28293

Stereo Component Amplifier Assy:

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

–

DIAGNOSTICS

AUDIO SYSTEM

DI–2017

2211

2

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

PREPARATION:
Disconnect the connectors from the radio receiver 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 each speaker and body
ground to check for a short circuit in wire harness.
OK:

10 k

Ω

 or higher

HINT:
Refer to the wiring diagram for connection of each terminal.

NG

Repair or replace harness or connector.

OK

I28759

Front Door Speaker Assy and Woofer 
Connector Front View:

F14

F15

DI–2018

–

DIAGNOSTICS

AUDIO SYSTEM

2212

3

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

4

Inspect tweeter.

CHECK:
Check that 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 and the left one.

OK

Replace tweeter.

NG