Inspection Procedure

1. Disconnect the overhead J/B connector O2 and multi-display connector M4.
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART
   
   

   Tester connection	Condition	Specified condition
   ACC - MACC	Always	Below 1 Ω
   MI1+ - MIN+	Always	Below 1 Ω
   MIC- - MIN-	Always	Below 1 Ω
   N.C - 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 1: Identifying O2 And M4 Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Reconnect the multi-display connector M4.
2. Measure the voltage according to the value(s) in the table below.

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART
   
   

   Tester connection	Condition	Specified condition
   MACC - Body ground	Ignition SW ACC	4 to 6V

Fig 2: Identifying M4 Multi-Display Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE MULTI-DISPLAY 

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