Microphone Circuit between Microphone and Radio Receiver

AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM (for Radio and Display Type with Intuitive Parking Assist System): Microphone Circuit between Microphone and Radio Receiver
- Microphone Circuit between Microphone and Radio Receiver

DESCRIPTION

* The navigation ECU sub-assembly and roof console box assembly (telephone microphone assembly) are connected to each other using the microphone connection detection signal lines.

* Using this circuit, the navigation ECU sub-assembly sends power to the roof console box assembly (telephone microphone assembly), and the roof console box assembly (telephone microphone assembly) sends microphone signals to the navigation ECU sub-assembly.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (NAVIGATION ECU SUB-ASSEMBLY - ROOF CONSOLE BOX ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY))

(a) Disconnect the navigation ECU sub-assembly connector.

(b) Disconnect the roof console box assembly (telephone microphone assembly) connector.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

2. INSPECT NAVIGATION ECU SUB-ASSEMBLY

(a) Reconnect the navigation ECU sub-assembly connector.

(b) Reconnect the roof console box assembly (telephone microphone assembly) connector.

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





Standard Voltage:





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

Standard Resistance:





Text in Illustration





NG -- REPLACE NAVIGATION ECU SUB-ASSEMBLY Removal
OK -- Continue to next step.

3. INSPECT ROOF CONSOLE BOX ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY)

(a) Disconnect the roof console box assembly (telephone microphone assembly) connector.

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





Standard Resistance:





Text in Illustration





NG -- REPLACE ROOF CONSOLE BOX ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY) Removal
OK -- Continue to next step.

4. INSPECT ROOF CONSOLE BOX ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY)

(a) Reconnect the navigation ECU sub-assembly connector.

(b) Reconnect the roof console box assembly (telephone microphone assembly) connector.





(c) Turn the power switch on (ACC).

(d) Connect an oscilloscope to terminals 13 (MCO+) and 12 (MCO-) of the roof console box assembly (telephone microphone assembly) connector.

(e) Check the waveform of the telephone microphone assembly using the oscilloscope.

Result:





Text in Illustration





B -- REPLACE ROOF CONSOLE BOX ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY) Removal

A -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Problem Symptoms Table