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Microphone Circuit Between Microphone and Navigation Receiver Assembly








NAVIGATION / MULTI INFO DISPLAY: NAVIGATION SYSTEM: Microphone Circuit between Microphone and Navigation Receiver Assembly

Microphone Circuit between Microphone and Navigation Receiver Assembly

DESCRIPTION

This circuit sends a microphone 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
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - TELEPHONE MICROPHONE ASSEMBLY)




(a) Disconnect the E21 navigation receiver assembly connector.




(b) Disconnect the P5 telephone microphone 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.

3. INSPECT MICROPHONE




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





Text in Illustration





NG -- REPLACE TELEPHONE MICROPHONE ASSEMBLY
OK -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE
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