Microphone Circuit Between Overhead J/B and Multi-Display

NAVIGATION: NAVIGATION SYSTEM: Microphone Circuit between Overhead J/B and Multi-display

Microphone Circuit between Overhead J/B and Multi-display

DESCRIPTION

This circuit sends a microphone signal from the microphone to the multi-display. It also supplies power from multi-display to the microphone.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK MULTI-DISPLAY (MACC VOLTAGE)




(a) Measure the voltage of the display.
Standard voltage:






NG -- REPLACE MULTI-DISPLAY
OK -- Continue to next step.

2. CHECK WIRE HARNESS (MULTI-DISPLAY - OVERHEAD JUNCTION BLOCK)




(a) Disconnect the M14 display connector.
(b) Disconnect the O3 junction block connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- PROCEED TO NEXT INSPECTION PROCEDURE SHOWN IN PROBLEM SYMPTOMS TABLE