Toyota Sequoia (2005). Manual - part 564

DIDAL–01

I28334

R24

–

DIAGNOSTICS

REAR SEAT AUDIO SYSTEM

DI–2051

2245

TERMINALS OF ECU

1.

REAR SEAT AUDIO CONTROLLER

Terminals No. (Symbols)

Wiring Color

Terminal 

Description

Condition

Specified value

R24–1 – Body ground

(SGN1 – Body ground)

Shielded – 

Body ground

Ground

Always

Below 1 V

R24–2 – R24–17

(HP1L – GND)

BR – LG

Sound signal

(Output)

RSA system is sounding (Headphone)

A waveform syn-

chronized with

sounds is output

R24–3 – R24–17

(HP1R – GND)

BR – LG

Sound signal

(Output)

RSA system is sounding (Headphone)

A waveform syn-

chronized with

sounds is output

R24–6 – R24–17

(R–L– – GND)

W – LG

Sound signal

(Input)

RSA system is sounding

A waveform syn-

chronized with

sounds is output

R24–7 – R24–17

(R–L+ – GND)

W – LG

Sound signal

(Input)

RSA system is sounding

A waveform syn-

chronized with

sounds is output

R24–8 – R24–17

(R–R– – GND)

W – LG

Sound signal

(Input)

RSA system is sounding

A waveform syn-

chronized with

sounds is output

R24–9 – R24–17

(R–R+ – GND)

W – LG

Sound signal

(Input)

RSA system is sounding

A waveform syn-

chronized with

sounds is output

R24–10 – Body ground

(SG1 – Body ground)

Shielded – 

Body ground

Ground

Always

Below 1 V

R24–11 – R24–17

(RMUT – GND)

LG – LG

Mute signal

Audio system is playing 

→

 Changing mode

Above 3.5 V 

→

Below 1 V

R24–12 – R24–17

(+B – GND)

LG – LG

Battery

Always

10 to 14 V

R24–13 – Body ground

(SGN2 – Body ground)

Shielded – 

Body ground

Ground

Always

Below 1 V

R24–14 – R24–17

(HP2L – GND)

BR – LG

Sound signal

(Output)

RSA system is sounding (Headphone)

A waveform syn-

chronized with

sounds is output

R24–15 – R24–17

(HP2R – GND)

BR – LG

Sound signal

(Output)

RSA system is sounding (Headphone)

A waveform syn-

chronized with

sounds is output

R24–17 – Body ground

(GND – Body ground)

LG – 

Body ground

Ground

Always

Below 1 

Ω

I28323

H10

H11

Headphone Terminal LH

Headphone Terminal RH

DI–2052

–

DIAGNOSTICS

REAR SEAT AUDIO SYSTEM

2246

R24–22 –R24–17 (TX+ –

GND)

LG – LG

AVC–LAN

communication

signal

Ignition switch ON

2 to 3 V

R24–23 –R24–17 (TX– –

GND)

LG – LG

AVC–LAN

communication

signal

Ignition switch ON

2 to 3 V

R24–24 – R24–17

(ACC – GND)

LG – LG

Ignition (ACC)

Ignition switch ON

10 to 14 V

2.

HEADPHONE TERMINAL

Terminal No. (Symbols)

Wiring Color

Terminal 

Description

Condition

Specified value

H10–1 – H10–3

(HPR – SGND)

BR – Shielded

Sound signal

(Input)

External device system sounding

(At that time of headphone terminal use)

A waveform syn-

chronized with

sound is output

H10–2 – H10–3

(HPL – SGND)

BR – Shielded

Sound signal

(Input)

External device system sounding

(At that time of headphone terminal use)

A waveform syn-

chronized with

sound is output

H10–3 – Body ground

(SGND – Body ground)

Shielded – Body

ground

Ground

Always

Below 1 V

H11–1 – H11–3

(HPR – SGND)

BR – Shielded

Sound signal

(Input)

External device system sounding

(At that time of headphone terminal use)

A waveform syn-

chronized with

sound is output

H11–2 – H11–3

(HPL – SGND)

BR – Shielded

Sound signal

(Input)

External device system sounding

(At that time of headphone terminal use)

A waveform syn-

chronized with

sound is output

H11–3 – Body ground

(SGND – Body ground)

Shielded – Body

ground

Ground

Always

Below 1 V

DIDAH–01

I28317

Switch Assy:

–

DIAGNOSTICS

REAR SEAT AUDIO SYSTEM

DI–2053

2247

DTC CHECK / CLEAR

1.

DIAGNOSIS CHECK

HINT:
RSA system inspects the devices consisting of Sub AVC–LAN
on the rear seat audio controller assy.
(a)

Starting Main AVC–LAN (See page 

DI–1974

, 

DI–2191

).

HINT:



As starting Main AVC–LAN to operate the diagnosis
mode, Sub AVC–LAN also automatically enters the diag-
nosis mode. Perform the diagnosis mode operation on
the rear seat audio controller assy.



Use a switch assy to operate diagnosis mode.

(b)

Service Check Screen
Reference

In the service check mode, the system check and
the diagnosis memory check are performed, and
the check results are displayed in ascending order
of the device codes (physical address).

Terms

Meaning

Component code

(Physical address)

Three–digit code (In hexadecimal) given to each device

comprising AVC–LAN. Corresponding to its function, individ-

ual symbol is provided.

Logical address

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

device unit in each device comprising AVC–LAN.

(c)

Finishing Diagnosis Mode (See page 

DI–1974

, 

DI–2191

).

(d)

Element Check Mode
After the diagnosis start–up, the system enters the ele-
ment check mode. Check that the all elements come on.

DI–2054

–

DIAGNOSTICS

REAR SEAT AUDIO SYSTEM

2248

(e)

Service Check Mode Result Display (for checking the cur-
rent and the past system conditions)
(1)

Press the ”TUNE/TRACK UP” switch to see the
check result of each device.

(2)

Check result display.

Display

Original Language

Meaning

Action to be taken

good

Good (normal)

No DTC is detected in both ”System Check Mode” and

”Diagnosis Memory Mode”.

–

NCON

No connection

The system recognized the component when it was regis-

tered, but the component gives no response to the ”Diagno-

sis Mode ON Request”.

Check the power source cir-

cuit and the communication

circuit of the device indi-

cated by the device code

(physical address).

ECHN

Exchange

One or more DTC for ”Exchange” is detected in either ”Sys-

tem Check Mode” or ”Diagnosis Memory Mode”.

Go to the detailed informa-

tion mode to check the

trouble area by referring to

the DTC list.

CHEC

Check

When no DTC is detected for ”Exchange”, one or more DTC

for ”Check” is detected in either ”System Check Mode” or

”Diagnosis Memory Mode”.

Go to the detailed informa-

tion mode to check the

trouble area referring to the

DTC list.

I28309

The illustration shows the case that the system has 2 devices with codes 190 and 360, and the device (code
360) has a trouble.
The check result is displayed in ascending order of device code. The device code is displayed first, and then
the check result.

P–––indicates physical address
190–––physical address

good–––”The component is normal”.

P–––indicates physical address
360–––physical address

CHEC–––”Check needed”.

: TUNE/TRACK UP

: TUNE/TRACK DOWN