Toyota Sequoia (2005). Manual - part 621

I28759

F14

Connector Front View:

–

DIAGNOSTICS

NAVIGATION SYSTEM

DI–2279

2473

5

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

6

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

I36938

I28293

Stereo Component Amplifier Assy
Wire Harness View:

FL–

FL+

S9

I28757

Front door Speaker Assy
Connector Front View:

F14

I28758

T12

Tweeter Connector Front View:

DI–2280

–

DIAGNOSTICS

NAVIGATION SYSTEM

2474

7

Check harness and connector (Front door speaker assy – tweeter, stereo compo-
nent amplifier assy)

PREPARATION:
Disconnect the stereo component amplifier assy connector.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:

Tester connection 

(Symbol)

Condition

Specified condition

F14–1 – T12–3

Always

Below 1 

Ω

F14–2 – T12–4

Always

Below 1 

Ω

T12–2 – S9–2 (FL+)

Always

Below 1 

Ω

T12–1 – S9–11 (FL–)

Always

Below 1 

Ω

F14–1 – Body ground

Always

10 k

Ω 

or higher

F14–2 – Body ground

Always

10 k

Ω 

or higher

T12–1 – Body ground

Always

10 k

Ω 

or higher

T12–2 – Body ground

Always

10 k

Ω 

or higher

NG

Repair or replace harness or connector.

OK

I28299

Radio and Navigation Assy
Wire Harness View:

IVO–

IVO+

R27

I28752

INT +

INT –

Stereo Component Amplifier Assy
Wire Harness View:

S10

–

DIAGNOSTICS

NAVIGATION SYSTEM

DI–2281

2475

8

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 value(s) in the table
below.
OK:

Symbol 

(Tester connection)

Condition

Specified condition

IVO+ (R27–11) – 

INT+ (S10–23)

Always

Below 1 

Ω

IVO– (R27–12) – 

INT– (S10–22)

Always

Below 1 

Ω

IVO+ (R27–11) – 

Body ground

Always

10 k

Ω

 or higher

IVO– (R27–12) – 

Body ground

Always

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

).

DI–2282

–

DIAGNOSTICS

NAVIGATION SYSTEM

2476

Speaker circuit

CIRCUIT DESCRIPTION

A sound signal amplified by the amplifier located in the radio and navigation assy is sent to each speaker
through this circuit.
If there is a short in this circuit, the stereo component amplifier assy detects it and stops output to the speak-
ers.
Thus sound can not be heard from the speakers even if there is no malfunction in the stereo component
amplifier or the speakers.

DIDDM–01