Toyota Sequoia (2005). Manual - part 543

DID9Q–01

–

DIAGNOSTICS

AUDIO SYSTEM

DI–1967

2161

PROBLEM SYMPTOMS TABLE

NOTICE:
For the troubleshooting procedures of the audio system with a navigation system, refer to the navi-
gation system (See page 

DI–2184

).

RADIO RECEIVER ASSY
HINT:
Inspect the ”Fuse” and ”Relay” before confirming the suspected area as shown in the charts below.

Symptom

Suspected Area

See page

Pressing power switch does not start system.

3. Power source circuit (radio receiver assy)

4. Radio receiver assy

DI–1990

–

A audio system cannot be operated.

1. Steering pad switch circuit

2. Radio receiver assy

DI–1995

–

No sound cannot be heard (Separate type amplifier).

1. Power source circuit (stereo component amplifier assy)

2. Sound signal circuit

3. Speaker circuit

4. AVC–LAN circuit (radio receiver assy – stereo compo-

nent amplifier)

5. AVC–LAN circuit (radio receiver assy – rear seat audio

controller) w/ RSA system

6. AVC–LAN circuit (radio receiver assy – multi–display

controller) w/ RSE system

7. Mute signal circuit

8. Stereo component amplifier assy

9. Radio receiver assy

DI–1993

DI–2011

DI–2013

DI–2023

DI–2061

DI–2139

DI–2008

–

–

No sound cannot heard (Built–in type amplifier).

1. Power source circuit (radio receiver assy)

2. Speaker circuit

3. Radio receiver assy

DI–1990

DI–2013

–

Sound quality is bad in all modes (volume is too low).

(Separate type amplifier)

1. Power source circuit (radio receiver assy)

2. Power source circuit (stereo component amplifier assy)

3. Speaker circuit

4. Sound signal circuit

5. Sound quality is bad in all modes (volume is too low)

6. Stereo component amplifier assy

DI–1990
DI–1993
DI–2013
DI–2011
DI–2026

–

Sound quality is bad in all modes (volume is too low).

(Built–in type amplifier)

1. Power source circuit (radio receiver assy)

2. Speaker circuit

3. Sound quality is bad in all modes (volume is too low)

DI–1990

DI–2013

DI–2026

Noise occurs.

–

DI–2027

Radio broadcast cannot be received (bad reception).

–

DI–2028

CD cannot be inserted or is ejected right after insertion.

1. Power source circuit (radio receiver assy)

2. CD cannot be inserted or is ejected right after insertion

DI–1990
DI–2030

CD cannot be ejected.

1. Power source circuit (radio receiver assy)

2. CD cannot be ejected

DI–1990
DI–2032

Sound quality is bad only when playing CD (volume is too low).

–

DI–2033

CD sound skips.

–

DI–2034

Cassette tape cannot be inserted or played.

1. Power source circuit (radio receiver assy)

2. Cassette tape cannot be inserted or played

DI–1990
DI–2036

Cassette tape cannot be ejected.

1. Power source circuit (radio receiver assy)

2. Cassette tape cannot be ejected

DI–1990
DI–2038

Sound quality is bad only when playing tape.

–

DI–2040

Tape is tangled due to incorrect tape speed or auto–reverse mal-

function.

–

DI–2042

DI–1968

–

DIAGNOSTICS

AUDIO SYSTEM

2162

STEERING PAD SWITCH

Symptom

Suspected Area

See page

A audio system cannot be operated with steering pad switch.

1. Steering pad switch circuit

2. Radio receiver assy

DI–1995

–

OTHERS

Symptom

Suspected Area

See page

Radio receiver cannot be dimmer in night time.

1. Illumination circuit

2. Radio receiver assy

DI–1999

–

DID9R–01

I28312

R4

R19

R20

–

DIAGNOSTICS

AUDIO SYSTEM

DI–1969

2163

TERMINALS OF ECU

1.

RADIO RECEIVER ASSY (SEPARATE TYPE AMPLIFIER)

Symbols (Terminal No.)

Wiring Color

Terminal Description

Condition

Specification

BU+B (R4–1) – GND (R4–20)

L–Y – BR

Battery

Always

10 to 14 V

ILL+ (R4–2) – GND (R4–20)

G – BR

Illumination (dimmer)

signal

Light control switch OFF 

→

 TAIL or

HEAD

Below 1 V 

→

10 to 14 V

TX+ (R4–5) – GND (R4–20)

V – BR

AVC–LAN

communication signal

Ignition switch ON

2 to 3 V

MUTE (R4–7) – GND (R4–20)

R–W – BR

MUTE signal

Audio system is playing 

→

changing

mode

Above 3.5 V 

→

Below 1 V

R+ (R4–8) – GND (R4–20)

W – BR

Sound signal

(Right output)

Audio system is playing

A waveform synchro-

nized with sounds is

output

L+ (R4–9) – GND (R4–20)

B – BR

Sound signal

(Left output)

Audio system is playing

A waveform synchro-

nized with sounds is

output

GND (R4–10) – Body ground

Shielded – 

Body ground

Shield ground

Always

Below 1 V

ACC+B (R4–11) – 

GND (R4–20)

GR – BR

Accessory (ON)

Turn ignition switch to OFF 

→

ACC

10 to 14 V

ILL– (R4–12) – GND (R4–20)

W–G – BR

Illumination (rheostat)

signal

Light control switch TAIL

Below 1 V 

→

10 to 14 V

ANT+B (R4–13) – 

GND (R4–20)

B–R – BR

Power source of antenna

Radio switch ON and AM or FM

10 to 14 V

TX– (R4–15) – GND (R4–20)

P – BR

AVC–LAN

communication signal

Ignition switch ON

2 to 3 V

R– (R4–18) – GND (R4–20)

G – BR

Sound signal

(Right output)

Audio system is playing

A waveform synchro-

nized with sounds is

output

L– (R4–19) – GND (R4–20)

R – BR

Sound signal

(Left output)

Audio system is playing

A waveform synchro-

nized with sounds is

output

GND (R4–20) – Body ground

BR – 

Body ground

Ground

Always

Below 1 V

GND (R19–6) – GND (R4–20)

BR–W – BR

Steering pad switch

ground

Always

Below 1 V

SW1 (R19–7) – GND (R4–20)

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 (R4–20)

GR–R – BR

Steering pad switch signal

Steering pad switch not operating

→

MODE switch push

4 V or more 

→

Below 2.5 V

DI–1970

–

DIAGNOSTICS

AUDIO SYSTEM

2164

(*1) TX1+ (R19–9) – 

GND (R4–20)

L – BR

AVC–LAN

communication signal

Ignition switch ON

2 to 3 V

(*1) TX1– (R19–10) – 

GND (R4–20)

LG – BR

AVC–LAN

communication signal

Ignition switch ON

2 to 3 V

(*1) SLD1 (R19–14) – 

Body ground

Shielded – 

Body ground

Shield ground

Always

Below 1 V

(*1) RSR+ (R19–15) – 

GND (R4–20)

W – BR

Sound signal

(Right output)

Audio system is playing

A waveform synchro-

nized with sound is out-

put

(*1) RSR– (R19–16) – 

GND (R4–20)

G – BR

Sound signal

(Right output)

Audio system is playing

A waveform synchro-

nized with sound is out-

put

(*1) RSL+ (R19–17) – 

GND (R4–20)

B – BR

Sound signal

(Left output)

Audio system is playing

A waveform synchro-

nized with sound is out-

put

(*1) RSL– (R19–18) – 

GND (R4–20)

R – BR

Sound signal

(Left output)

Audio system is playing

A waveform synchro-

nized with sound is out-

put

(*1) RMU (R19–19) – 

GND (R4–20)

R–W – BR

MUTE signal

Audio system is playing 

→

 

changing mode

Above 3.5 V 

→

 

Below 1 V

(*1) S–GND (R20–1) – 

Body ground

Shielded – 

Body ground

Shield ground

Always

Below 1 V

(*1) R+ (R20–2) – 

GND (R4–20)

W – BR

Sound signal

(Right input)

Rear seat entertainment system is

playing

A waveform synchro-

nized with sound is out-

put

(*1) R– (R20–3) – 

GND (R4–20)

G – BR

Sound signal

(Right input)

Rear seat entertainment system is

playing

A waveform synchro-

nized with sound is out-

put

(*1) L+ (R20–4) – GND (R4–20)

B – BR

Sound signal

(Left input)

Rear seat entertainment system is

playing

A waveform synchro-

nized with sound is out-

put

(*1) L– (R20–5) – GND (R4–20)

R – BR

Sound signal

(Left input)

Rear seat entertainment system is

playing

A waveform synchro-

nized with sound is out-

put

(*1) MUTE (R20–6) – 

GND (R4–20)

R–G – BR

MUTE signal

Rear seat entertainment system is

playing 

→

 changing mode

Above 3.5 V 

→

 

Below 1 V

(*2) TX1+ (R19–9) – 

GND (R4–20)

L – BR

AVC–LAN

communication signal

Ignition switch ON

2 to 3 V

(*2) TX1– (R19–10) – 

GND (R4–20)

LG – BR

AVC–LAN

communication signal

Ignition switch ON

2 to 3 V

(*2) SLD1 (R19–14) – 

Body ground

Shielded – 

Body ground

Shield ground

Always

Below 1 V

(*2) RSR+ (R19–15) – 

GND (R4–20)

W – BR

Sound signal

(Right output)

Audio system is playing

A waveform synchro-

nized with sound is out-

put

(*2) RSR– (R19–16) – 

GND (R4–20)

G – BR

Sound signal

(Right output)

Audio system is playing

A waveform synchro-

nized with sound is out-

put

(*2) RSL+ (R19–17) – 

GND (R4–20)

B – BR

Sound signal

(Left output)

Audio system is playing

A waveform synchro-

nized with sound is out-

put

(*2) RSL– (R19–18) – 

GND (R4–20)

R – BR

Sound signal

(Left output)

Audio system is playing

A waveform synchro-

nized with sound is out-

put

(*2) RMU (R19–19) – 

GND (R4–20)

R–W – BR

MUTE signal

Audio system is playing 

→

 

changing mode

Above 3.5 V 

→

 

Below 1 V