Microphone Circuit between Overhead J/B and Multi-display

DESCRIPTION

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

WIRING DIAGRAM

INSPECTION PROCEDURE

1. CHECK HARNESS AND CONNECTOR (OVERHEAD J/B - MULTI-DISPLAY)

1. Disconnect the overhead J/B connector R5 and multi-display connector J51.

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

   Standard resistance:

   Tester connection	Condition	Specified condition
   ACC - MACC	Always	Below 1 Ω
   MI1+ - MIN+	Always	Below 1 Ω
   MIC- - MIN-	Always	Below 1 Ω
   TSW- - SGND	Always	Below 1 Ω
   ACC - Body ground	Always	10 kΩ or higher
   MI1+ - Body ground	Always	10 kΩ or higher
   MIC- - Body ground	Always	10 kΩ or higher

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

2. INSPECT MULTI-DISPLAY (CRT DISPLAY) DISPLAY

1. Reconnect the multi-display connector J51.

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

   Standard voltage:

   Tester connection	Condition	Specified condition
   MACC - Body ground	Engine switch on (ACC)	4 to 6 V

NG	REPLACE MULTI-DISPLAY

OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE