Toyota Sequoia (2005). Manual - part 544

I28313

R2

R3

R19

–

DIAGNOSTICS

AUDIO SYSTEM

DI–1971

2165

*1: w/ Rear seat entertainment system
*2: w/ Rear seat audio system

2.

RADIO RECEIVER ASSY (BUILT–IN TYPE AMPLIFIER)

Symbols (Terminal No.)

Wiring Color

Terminal Description

Condition

Specification

FR+ (R2–1) – GND (R2–7)

LG – BR

Sound signal (Front Right)

Audio system is playing

A waveform synchro-

nized with sounds is

output

FL+ (R2–2) – GND (R2–7)

P – BR

Sound signal (Front Left)

Audio system is playing

A waveform synchro-

nized with sounds is

output

ACC+B (R2–3) – GND (R2–7)

GR – BR

Accessory (ON)

Turn ignition switch to OFF 

→

 ACC

Below 1 V 

→

10 to 14 V

BU+B (R2–4) – GND (R2–7)

L–Y – BR

Battery

Always

10 to 14 V

FR– (R2–5) – GND (R2–7)

L – BR

Sound signal (Front Right)

Audio system is playing

A waveform synchro-

nized with sounds is

output

FL– (R2–6) – GND (R2–7)

V – BR

Sound signal (Front Left)

Audio system is playing

A waveform synchro-

nized with sounds is

output

GND (R2–7) – Body ground

BR – 

Body ground

Ground

Always

Below 1 V

ANT+B (R2–8) – GND (R2–7)

B–R – BR

Power source of antenna

Radio switch ON and AM or FM

10 to 14 V

ILL+ (R2–10) – GND (R2–7)

G – BR

Illumination (rheostat) sig-

nal

Light control switch OFF 

→

 TAIL or

HEAD

Below 1 V 

→

10 to 14 V

RR+ (R3–1) – GND (R2–7)

R – BR

Sound signal (Rear Right)

Audio system is playing

A waveform synchro-

nized with sounds is

output

RL+ (R3–2) – GND (R2–7)

B – BR

Sound signal (Rear Left)

Audio system is playing

A waveform synchro-

nized with sounds is

output

RR– (R3–3) – GND (R2–7)

W – BR

Sound signal (Rear Right)

Audio system is playing

A waveform synchro-

nized with sounds is

output

ILL– (R3–5) – GND (R2–7)

W–G – BR

Illumination (rheostat) sig-

nal

Light control switch OFF 

→

 TAIL or

HEAD

Below 1 V 

→

10 to 14 V

RL– (R3–6) – GND (R2–7)

Y – BR

Sound signal (Rear Left)

Audio system is playing

A waveform synchro-

nized with sounds is

output

GND (R19–6) – GND (R2–7)

BR–W – BR

Steering pad switch

ground

Always

Below 1 V

I28722

S10

S9

DI–1972

–

DIAGNOSTICS

AUDIO SYSTEM

2166

SW1 (R19–7) – GND (R2–70)

LG–R – BR

Steering pad switch signal

Steering pad switch not operating.

→

SEEK+ switch push

→

SEEK– switch push

→

VOL+ switch push

→

VOL– switch push

4 V or more

→

Approx. 0.5 V

→

Approx. 0.9 V

→

Approx. 2.0 V

→

Approx. 3.4 V

SW2 (R19–8) – GND (R2–7)

GR–R – BR

Steering pad switch signal

Steering pad switch not operating

→

MODE switch push

4 V or more 

→

Below 2.5 V

3.

STEREO COMPONENT AMPLIFIER ASSY

Symbols (Terminal No.)

Wiring Color

Terminal Description

Condition

Specification

B+ (S9–1) – E (S9–16)

L–W – BR

Battery

Always

10 to 14 V

RL+ (S9–4) – E (S9–16)

B – BR

Sound signal (Rear Left)

Audio system is playing

A waveform synchro-

nized with sounds is

output

RR+ (S9–5) – E (S9–16)

R – BR

Sound signal (Rear Right)

Audio system is playing

A waveform synchro-

nized with sounds is

output

FL+ (S9–2) – E (S9–16)

P – BR

Sound signal (Front Left)

Audio system is playing

A waveform synchro-

nized with sounds is

output

FR+ (S9–3) – E (S9–16)

LG – BR

Sound signal (Front Right)

Audio system is playing

A waveform synchro-

nized with sounds is

output

WFL+ (S9–6) – 
E (S9–16)

L–W – BR

Sound signal (Front Left)

Audio system is playing

A waveform synchro-

nized with sounds is

output

WFR+ (S9–7) – 
E (S9–16)

R – BR

Sound signal (Front Right)

Audio system is playing

A waveform synchro-

nized with sounds is

output

B2+ (S9–10) – E (S9–16)

L–W – BR

Battery

Always

10 to 14 V

RL– (S9–13) – E (S9–16)

Y – BR

Sound signal (Rear Left)

Audio system is playing

A waveform synchro-

nized with sounds is

output

RR– (S9–14) – E (S9–16)

W – BR

Sound signal (Rear Right)

Audio system is playing

A waveform synchro-

nized with sounds is

output

GND (S9–15) – Body ground

BR – 

Body ground

Ground

Always

Below 1 V

E (S9–16) – Body ground

BR – 

Body ground

Ground

Always

Below 1 V

FL– (S9–11) – E (S9–16)

V – BR

Sound signal (Front Left)

Audio system is playing

A waveform synchro-

nized with sounds is

output

FR– (S9–12) – E (S9–16)

L – BR

Sound signal (Front Right)

Audio system is playing

A waveform synchro-

nized with sounds is

output

–

DIAGNOSTICS

AUDIO SYSTEM

DI–1973

2167

WFL– (S9–17) – 
E (S9–16)

G – BR

Sound signal (Front Left)

Audio system is playing

A waveform synchro-

nized with sounds is

output

WFR– (S9–18) – 
E (S9–16)

Y – BR

Sound signal (Front Right)

Audio system is playing

A waveform synchro-

nized with sounds is

output

MUTE (S10–1) – E (S9–16)

R–W – BR

Mute signal from radio 
receiver

Audio system is sounding 

→

 

changing mode

Above 3.5 V 

→

Below 1 V

L– (S10–2) – E (S9–16)

R – BR

Sound signal from radio 
receiver (Left)

Audio system is playing

A waveform synchro-

nized with sounds is

output

L+ (S10–3) – E (S9–16)

B – BR

Sound signal from radio 
receiver (Left)

Audio system is playing

A waveform synchro-

nized with sounds is

output

R– (S10–4) – E (S9–16)

G – BR

Sound signal from radio 
receiver (Right)

Audio system is playing

A waveform synchro-

nized with sounds is

output

R+ (S10–5) – E (S9–16)

W – BR

Sound signal from radio 
receiver (Right)

Audio system is playing

A waveform synchro-

nized with sounds is

output

SGND (S10–6) – Body ground

Shielded – 

Body ground

Ground

Always

Below 1 V

ACC (S10–12) – E (S9–16)

GR – BR

Accessory (ON)

Turn ignition switch OFF 

→

ACC

Below 1 V 

→

10 to 14 V

TX– (S10–19) – E (S9–16)

P – BR

AVC–LAN
communication signal

Turn ignition switch to ACC

2 to 3 V

TX+ (S10–20) – E (S9–16)

V – BR

AVC–LAN
communication signal

Turn ignition switch to ACC

2 to 3 V

4.

MULTI–DISPLAY CONTROLLER ASSY
See page 

DI–2090

5.

REAR SEAT AUDIO CONTROLLER
See page 

DI–2051

DID9S–01

I24383

”1ch” Switch

”SEEK TRACK”
DOWN Switch

”SEEK TRACK” 
UP Switch

”DISC” Switch

”2ch” Switch

”3ch” Switch

”4ch” Switch

”5ch” Switch

”6ch” Switch

DI–1974

–

DIAGNOSTICS

AUDIO SYSTEM

2168

DTC CHECK / CLEAR

1.

DIAGNOSTIC CHECK

(a)

Starting Diagnostic Mode (All elements come on during the SW check mode).
(1)

Turn off the audio system and turn the ignition switch to the ACC position. While pressing the
preset switches ”1” and ”6” at the same time, press the ”DISC” 3 times.

(2)

Reference:



When the system enters the Diagnosis Mode, a beep sound is emitted 3 times and all the
elements come on during the SW check mode.



It takes about 40 seconds to complete the check.



Turn all the elements in the LCD on.



When pressing the switch, confirm beep sound is emitted.

(b)

Service Check Screen.
(1)

Press the ”SEEK TRACK” switch to enter the ”Service Check Screen”.

(2)

In the service check mode, the system check and the diagnostic memory check are performed,
and the check results are displayed in ascending order of the component codes (physical ad-
dress.)

Terms

Meaning

Component code

(Physical address)

Three–digit code (In hexadecimal) given to each device comprising AVC–LAN.

Corresponding to its function, individual symbol is provided.

Logical address

Two–digit code (In hexadecimal) given to each function and device unit in each

device comprising AVC–LAN.

Code No. (physical address) List

Code No.

(physical address)

Equipment name

190

Radio receiver assy (Audio head unit)

440

Stereo component amplifier assy

1F6

Multi–display controller (RSE ECU)

1F4

Rear seat audio controller

(c)

Finishing Diagnostic Mode.
Press the ”DISC” for 2 seconds or more, or turn the ignition switch off.