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

Steering pad switch not operating.

4 V or more

"SEEK+ switch push

"Approx. 0.5 V

SW1 (R19-7) - GND (R4-20)

LG-R - BR

Steering pad switch signal

"SEEK- switch push

"Approx. 0.9 V

"VOL+ switch push

"Approx. 2.0 V

"VOL- switch push

"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

I should include the harness diagram & No. but couldn't upload it!!

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