Microphone Circuit Between Microphone and Navigation ECU

NAVIGATION / MULTI INFO DISPLAY: NAVIGATION SYSTEM (for DVD): Microphone Circuit between Microphone and Navigation ECU
- Microphone Circuit between Microphone and Navigation ECU

DESCRIPTION

* The display and navigation module display and map light assembly (telephone microphone assembly) are connected to each other using the microphone connection detection signal lines.

* Using this circuit, the display and navigation module display sends power to the map light assembly (telephone microphone assembly), and the map light assembly sends microphone signals to the display and navigation module display.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK HARNESS AND CONNECTOR

(a) Disconnect the H60 display and navigation module display connector.

(b) Disconnect the T6 map light 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 DISPLAY AND NAVIGATION MODULE DISPLAY

(a) Reconnect the H60 display and navigation module display connector.

(b) Reconnect the T6 map light 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 DISPLAY AND NAVIGATION MODULE DISPLAY Removal
OK -- Continue to next step.

3. INSPECT MAP LIGHT ASSEMBLY

(a) Disconnect the T6 map light assembly connector.

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





Standard Resistance:





Text in Illustration





NG -- REPLACE TELEPHONE MICROPHONE ASSEMBLY
OK -- Continue to next step.

4. INSPECT MAP LIGHT ASSEMBLY

(a) Reconnect the H60 display and navigation module display connector.

(b) Reconnect the T6 map light assembly connector.





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

(d) Connect an oscilloscope to terminals 13 (MCO+) and 12 (MCO-) of the T6 map light assembly connector.

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

Result:





Text in Illustration





B -- REPLACE TELEPHONE MICROPHONE ASSEMBLY

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

5. REPLACE TELEPHONE MICROPHONE ASSEMBLY

(a) Replace the telephone microphone assembly Removal.

(b) Check if the same malfunction recurs.

Result:





B -- REPLACE MAP LIGHT ASSEMBLY Removal

A -- END