Microphone Circuit between Overhead Junction Block and Multi-display: Wiring Diagram

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

   Fig 2: Identifying Overhead J/B Connector R5 And Multi-Display Connector J51

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step. 

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

   Fig 3: Identifying Multi-Display Connector J51

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE MULTI-DISPLAY 

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE