Microphone Circuit between Microphone and Navigation ECU

NAVIGATION: NAVIGATION SYSTEM (for DVD): 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 (amplifier 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 (amplifier microphone assembly).

WIRING DIAGRAM

PROCEDURE

1. CHECK HARNESS AND CONNECTOR

(a) Disconnect the K46 display and navigation module display connector.

(b) Disconnect the W6 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 K46 display and navigation module display connector.

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

Standard Voltage:

Text in Illustration

NG -- REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY Removal
OK -- Continue to next step.

3. INSPECT MAP LIGHT ASSEMBLY

(a) Reconnect the K46 display and navigation module display connector.

(b) Reconnect the W6 map light assembly connector.

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

(d) Connect an oscilloscope to terminals 3 (MI1+) and 2 (MIC-) of the W6 map light assembly connector.

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

Result:

Text in Illustration

B -- REPLACE AMPLIFIER MICROPHONE ASSEMBLY

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

4. REPLACE AMPLIFIER MICROPHONE ASSEMBLY

(a) Replace the amplifier microphone assembly Removal.

(b) Check if the same malfunction recurs.

Result:

B -- REPLACE MAP LIGHT ASSEMBLY Service and Repair

A -- END