Toyota Sequoia (2005). Manual - part 556

–

DIAGNOSTICS

AUDIO SYSTEM

DI–2019

2213

5

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–1967

).

I28754

Radio Receiver Assy
Wire Harness View:

FL–

FL+

FR+

RR–

RL–

RR+

RL+

R2

R3

FR–

I28355

Front Door Speaker Assy and Rear 
Speaker Connector Front View:

F17

F16

R9

R10

I28758

Tweeter Assy Connector Front View:

T12

T13

DI–2020

–

DIAGNOSTICS

AUDIO SYSTEM

2214

6

Check harness and connector (Radio receiver assy – Speaker assy).

PREPARATION:
Disconnect the connectors from the radio receiver assy and
speakers.
CHECK:
Measure the resistance between the speaker and the radio re-
ceiver assy to check for an open circuit in the wire harness.
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

–

DIAGNOSTICS

AUDIO SYSTEM

DI–2021

2215

7

Inspect front door speaker assy.

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

Approximately 4 

Ω

NG

Replace front door speaker assy.

OK

8

Inspect tweeter assy.

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

DI–2022

–

DIAGNOSTICS

AUDIO SYSTEM

2216

9

Inspect rear speaker assy.

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

Approximately 4 

Ω

NG

Replace rear speaker assy.

OK

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

DI–1967

).