Microphone Circuit Between Microphone and Navigation Receiver Assembly

NAVIGATION: NAVIGATION SYSTEM: Microphone Circuit between Microphone and Navigation Receiver Assembly
- Microphone Circuit between Microphone and Navigation Receiver Assembly

DESCRIPTION

This circuit sends a microphone voice signal from the telephone microphone assembly to the navigation receiver assembly.

It also supplies power from the navigation receiver assembly to the telephone microphone assembly.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. INSPECT NAVIGATION RECEIVER ASSEMBLY

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

Standard Voltage:

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

Standard Resistance:

Text in Illustration

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

2. CHECK HARNESS AND CONNECTOR

(a) Disconnect the E4 navigation receiver assembly connector.

(b) Disconnect the Q11 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.

3. INSPECT TELEPHONE MICROPHONE ASSEMBLY

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

Standard Resistance:

Text in Illustration

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

4. INSPECT TELEPHONE MICROPHONE ASSEMBLY

(a) Reconnect the E4 navigation receiver assembly connector.

(b) Reconnect the Q11 telephone microphone assembly connector.

(c) Turn the ignition switch to ACC.

(d) Connect an oscilloscope to terminals 3 (MIC+) and 5 (MIC-) of the Q11 telephone microphone assembly connector.

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

Result:

Text in Illustration

NG -- REPLACE TELEPHONE MICROPHONE ASSEMBLY Removal

OK -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Symptom Related Diagnostic Procedures