Toyota Sequoia (2005). Manual - part 617

I28747

Radio and Navigation Assy
Wire Harness View:

R30

ILL–

I28577

R6

Light Control Rheostat
Wire Harness View:

ILL–

I28750

R27

SWG

Wire Harness View:

–

DIAGNOSTICS

NAVIGATION SYSTEM

DI–2263

2457

3

Check harness and connector (Radio and navigation assy – light control rheo-
stat).

PREPARATION:
Disconnect the radio and navigation assy and light control rheo-
stat connectors.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:

Symbol 

(Tester connection)

Condition

Specified condition

ILL– (R30–12) – 

ILL– (R6–6)

Always

Below 1 

Ω

ILL– (R30–12) – 

Body ground

Always

10 k

Ω

 or higher

NG

Repair or replace wire harness or connector.

OK

Replace radio and navigation assy.

4

Check radio and navigation assy.

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

Symptom 

(Tester connection)

Condition

Specified condition

SWG (R27–6) – 

Body ground

Light control switch TAIL

10 to 14 V

OK

Replace radio and navigation assy.

NG

I28296

1

10

DI–2264

–

DIAGNOSTICS

NAVIGATION SYSTEM

2458

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

–

DIAGNOSTICS

NAVIGATION SYSTEM

DI–2265

2459

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

C9–1 – 1

Always

Below 1 

Ω

C9–10 – 10

Always

Below 1 

Ω

NG

Replace spiral cable sub–assy.

OK

I28750

Radio and Navigation Assy
Wire Harness View:

R27

SWG

I28294

Spiral Cable Sub–assy
Connector Front View:

C9

I28576

270

°

 

Bright

0

°

 

Dark

R6

ILL–

DI–2266

–

DIAGNOSTICS

NAVIGATION SYSTEM

2460

7

Check harness and connector (Radio and navigation assy – spiral cable sub–
assy).

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

Symbol 

(Tester connection)

Condition

Specified condition

SWG (R27–6) – 

Spiral cable terminal 10

Always

Below 1 

Ω

SWG (R27–6) – 

Body ground

Always

10 k

Ω

 or higher

NG

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

OK

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

8

Inspect light control rheostat.

PREPARATION:
(a)

Reconnect the light control rheostat switch connector.

(b)

Ignition switch is ON.

(c)

Light control switch is TAIL or HEAD.

CHECK:
Measure the voltage according to the value(s) in the table be-
low.
OK:

Symbol 

(Tester connection)

Condition

Specified condition

ILL– (R6–6) – 

Body ground

Rheostat knob to fully

counterclockwise 

→

 

fully clockwise

Below 1 V 

→

 10 to 14 V