Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001D0B1
Model Year Start: 2019 Model: GR Corolla Prod Date Range: [06/2018 - 03/2019]
Title: NAVIGATION / MULTI INFO DISPLAY: NAVIGATION SYSTEM: Mute Signal Circuit between Radio Receiver and Stereo Component Amplifier; 2019 - 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 - 03/2019]

Mute Signal Circuit between Radio Receiver and Stereo Component Amplifier

DESCRIPTION

This circuit sends a signal to the stereo component amplifier assembly 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 assembly is functioning normally, no sound or only an extremely faint sound can be heard.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed. Refer to Precaution for Navigation System.

    Click here 2019 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 - 01/2019]; NAVIGATION / MULTI INFO DISPLAY: NAVIGATION SYSTEM: PRECAUTION 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; NAVIGATION / MULTI INFO DISPLAY: NAVIGATION SYSTEM: PRECAUTION

  • When replacing the radio and display receiver assembly, always replace it with a new one. If a radio and display receiver assembly which was installed to another vehicle is used, the following may occur:
    • A communication malfunction DTC may be stored.
    • The radio and display receiver assembly may not operate normally.

PROCEDURE

1.

INSPECT STEREO COMPONENT AMPLIFIER ASSEMBLY

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

I68-1 (MUTE) - Body ground

Engine switch on (ACC), audio system playing

→ Changing modes

2.0 V or higher

→ Below 1 V

*a

Component with harness connected

(Stereo Component Amplifier Assembly)

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE 2019 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 - 01/2019]; NAVIGATION / MULTI INFO DISPLAY: NAVIGATION SYSTEM: PROBLEM SYMPTOMS TABLE 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; NAVIGATION / MULTI INFO DISPLAY: NAVIGATION SYSTEM: PROBLEM SYMPTOMS TABLE

NG

2.

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

(a) Disconnect the I55 radio and display receiver assembly connector.

(b) Disconnect the I68 stereo component amplifier assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I55-25 (MUT1) - I68-1 (MUTE)

Always

Below 1 Ω

I55-25 (MUT1) or I68-1 (MUTE) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

INSPECT STEREO COMPONENT AMPLIFIER ASSEMBLY (OUTPUT SIGNAL)

(a) Reconnect the I68 stereo component amplifier assembly connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

I55-25 (MUT1) - Body ground

Engine switch on (ACC), audio system is playing

2.0 V or higher

*a

Front view of wire harness connector

(to Radio and Display Receiver Assembly)

OK

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY 2019 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 - 01/2019]; AUDIO / VIDEO: RADIO RECEIVER: REMOVAL 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; AUDIO / VIDEO: RADIO RECEIVER: REMOVAL

NG

REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY 2019 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 - 01/2019]; AUDIO / VIDEO: STEREO COMPONENT AMPLIFIER: REMOVAL 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; AUDIO / VIDEO: STEREO COMPONENT AMPLIFIER: REMOVAL