Mute Signal Circuit between Radio Receiver and Stereo Component Amplifier

DESCRIPTION

This circuit sends a signal to the stereo component amplifier to mute noise. Because of that, the noise produced by changing the sound source ceases.

If there is an open in the circuit, noise can be heard from the speakers when changing the sound source. If there is a short in the circuit, even though the stereo component amplifier is normal, no sound, or only an extremely small sound, can be produced.

WIRING DIAGRAM

Stereo Component Amplifier

Radio Receiver

MUTE

E20-

E12

MUTE

N

I045240E02

INSPECTION PROCEDURE

INSPECT STEREO COMPONENT AMPLIFIER

Wire Harness View:

MUTE

E126155E01

(a) Measure the voltage according to the value(s) in the table below. Standard voltage

Tester connection

Condition

Specified condition

MUTE - Body ground

Turn ignition switch on (ACC), Audio system is playing ^ Changing mode

Above 3.5 V ^ Below 1 V

Go to step 2

CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - STEREO COMPONENT AMPLIFIER)

Radio Receiver (12 Speaker) Wire Harness View:

IJOl

MUTE

MUTE

Stereo Component Amplifier Wire Harness View:

E126144E02

(a) Disconnect the the radio receiver E12 connector and stereo component amplifier E20 connector.

(b) Measure the resistance according to the values in the table below.

Standard resistance

Tester connection

Condition

Specified condition

MUTE - MUTE

Always

Below 1 Q

MUTE - Body ground

Always

10 kQ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE STEREO COMPONENT AMPLIFIER

(a) Replace the stereo component amplifier and check that it operates normally. OK:

The audio system operates normally.

REPLACE RADIO RECEIVER

Mute Signal Circuit between Radio Receiver and Tape Player

DESCRIPTION

This circuit sends a signal to the tape player to mute noise. Because of that, the noise produced by changing the sound source ceases.

If there is an open in the circuit, noise can be heard from the speakers when changing the sound source. If there is a short in the circuit, even though the tape player is normal, no sound, or only an extremely small sound, can be produced.

WIRING DIAGRAM

Tape Player

Radio Receiver

LMUT

E24-

-<E7

MUTE

N

I045240E03

INSPECTION PROCEDURE

INSPECT TAPE PLAYER

(a) Measure the voltage according to the value(s) in the table below. Standard voltage

Tester Connection

Condition

Specified Condition

LMUT - Body ground

Turn ignition switch on (ACC). Audio system is playing ^ Changing mode

Above 3.5 V ^ Below 1 V

NGj>

Go to step 2

CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - TAPE PLAYER)

Radio Receiver (12 Speaker) Wire Harness View:

MUTE

MUTE

Radio Receiver (9 Speaker, 6 CD Type) Wire Harness View:

Radio Receiver (9 Speaker, 1 CD Type) Wire Harness View:

(a) Disconnect the the radio receiver E17 connector and tape player E24 connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard resistance

Tester Connection

Condition

Specified Condition

MUTE -LMUT

Always

Below 1 Q

MUTE - Body ground

Always

10 kQ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

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