Up to 08/2009

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

DESCRIPTION

This circuit sends a microphone signal from the map light assembly (telephone microphone assembly) to the display and navigation module display.

It also supplies power from the display and navigation module display to the map light assembly (telephone microphone assembly).

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.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK HARNESS AND CONNECTOR

(a) Disconnect the G4 display and navigation module display connector.





(b) Disconnect the T10 map light assembly connector.





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

Standard Resistance:





Text in Illustration





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

2. INSPECT DISPLAY AND NAVIGATION MODULE DISPLAY

(a) Disconnect the T10 map light assembly connector.

(b) Reconnect the G4 display and navigation module display 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) 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 G4 display and navigation module display connector.

(b) Reconnect the T10 map light assembly connector.





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

(d) Connect an oscilloscope to terminals 34 (MCO+) and 35 (MCO-) of the T10 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