Navigation System Mute Signal Circuit Between Radio Receiver And Extension Module

Audio Visual Telematics. Corolla. Zre142 Aze141
Navigation Multi Info Display. Corolla. Zre142 Aze141

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT EXTENSION MODULE

CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - EXTENSION MODULE)

INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY (OUTPUT SIGNAL)

NAVIGATION SYSTEM - Mute Signal Circuit between Radio Receiver and Extension Module


DESCRIPTION

This circuit sends a signal to the extension module to mute noise. Due to this, 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 extension module is functioning, no sound, or only an extremely faint sound, can be heard.

WIRING DIAGRAM


Corolla. Zre142 Aze141.Navigation Multi Info Display.Navigation System.Navigation System Mute Signal Circuit Between Radio Receiver And Extension Module


INSPECTION PROCEDURE

NOTICE:
After replacing the radio and display receiver assembly of vehicles subscribed to pay-type satellite radio broadcasts, XM radio ID registration is necessary (w/ SDARS System).
1.INSPECT EXTENSION MODULE


    Corolla. Zre142 Aze141.Navigation Multi Info Display.Navigation System.Navigation System Mute Signal Circuit Between Radio Receiver And Extension Module

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    f1-1 (MUTE) - Body ground
    		Ignition switch ACC, audio system is playing
    → Changing modes
    		Above 3.5 V
    → Below 1 V
    Text in Illustration
    *a
    		Component with harness connected
    (Extension Module)


NG
Go to step 2
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (COROLLA_ZRE142 RM0000011BR0H9X.html)

2.CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - EXTENSION MODULE)

  1. Disconnect the radio and display receiver assembly connector.

  1. Disconnect the extension module connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    f3-6 (MUTE) - f1-1 (MUTE)
    		Always
    		Below 1 Ω
    f3-6 (MUTE) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY (OUTPUT SIGNAL)

  1. Reconnect the radio and display receiver assembly connector.



    Corolla. Zre142 Aze141.Navigation Multi Info Display.Navigation System.Navigation System Mute Signal Circuit Between Radio Receiver And Extension Module

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    f1-1 (MUTE) - Body ground
    		Ignition switch ACC, audio system is playing
    		Above 3.5 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Extension Module)


NG
REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY (COROLLA_ZRE142 RM000002XAJ01EX.html)
OK

REPLACE EXTENSION MODULE (COROLLA_ZRE142 RM000002XAJ01FX.html)