Toyota Sequoia (2005). Manual - part 552

I28741

Separate Type Amplifier 
Wire Harness View:

R19

GND

I28745

Built–in Type Amplifier 
Wire Harness View:

R19

GND

–

DIAGNOSTICS

AUDIO SYSTEM

DI–2003

2197

4

Check radio receiver assy.

PREPARATION:
Disconnect the radio receiver assy connector.
CHECK:
Measure the voltage according to the value(s) in the table be-
low.
OK:

Symbol 

(Tester connection)

Condition

Specified condition

GND (R19–6) – 

Body ground

Light control switch TAIL

10 to 14 V

OK

Replace radio receiver assy.

NG

I28296

1

10

DI–2004

–

DIAGNOSTICS

AUDIO SYSTEM

2198

5

Inspect steering pad switch assy.

PREPARATION:
(a)

Disconnect the steering pad switch connector.

(b)

Connect the positive (+) lead to terminal 1 and the negative (–) lead to terminal 10 of steering pad
switch assy connector.

CHECK:
Check if the illumination for the steering pad switch assy comes on.
OK:

Illumination for the steering pad switch assy comes on.

NG

Replace steering pad switch assy.

OK

I28295

Vehicle Side:

Steering Pad Switch Assy Side:

C9

A

–

DIAGNOSTICS

AUDIO SYSTEM

DI–2005

2199

6

Inspect spiral cable sub–assy.

PREPARATION:
Remove the spiral cable sub–assy.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:

Tester connection

Condition

Specified condition

A–1 – C9–1

Always

Below 1 

Ω

A–10 – C9–10

Always

Below 1 

Ω

NG

Replace spiral cable sub–assy.

OK

I28741

Separate Type Amplifier 
Wire Harness View:

R19

GND

I28745

Built–in Type Amplifier 
Wire Harness View:

R19

GND

I28294

Spiral Cable Sub–assy 
Connector Front View:

C9

DI–2006

–

DIAGNOSTICS

AUDIO SYSTEM

2200

7

Check harness and connector (Radio receiver assy – Spiral cable sub–assy).

PREPARATION:
Disconnect the spiral cable sub–assy connector.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:

Symbol 

(Tester connection)

Condition

Specified condition

GND (R19–6) – 

Spiral cable terminal 10

Always

Below 1 

Ω

GND (R19–6) – 

Body ground

Always

10 k

Ω

 or higher

NG

Repair or replace wire harness or connector
(Radio receiver assy – spiral cable sub–assy).

OK

Repair or replace wire harness or connector (Battery – spiral cable sub–assy).